Mercurial > docs > master
annotate discussion.roff @ 133:02660c14f6a8
Further re-ordering of the sections.
author | markus schnalke <meillo@marmaro.de> |
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date | Tue, 03 Jul 2012 16:50:41 +0200 |
parents | 7c741bc8f719 |
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1 .H0 "Discussion |
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2 .P |
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3 This main chapter discusses the practical work done in the mmh project. |
104 | 4 It is structured along the goals to achieve. |
5 The concrete work done | |
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6 is described in the examples of how the general goals were achieved. |
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7 The discussion compares the current version of mmh with the state of |
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8 nmh just before the mmh project started, i.e. Fall 2011. |
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9 Current changes of nmh will be mentioned only as side notes. |
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10 .\" XXX where do I discuss the parallel development of nmh? |
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11 |
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12 |
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13 |
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14 .\" -------------------------------------------------------------- |
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15 .H1 "Streamlining |
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16 |
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17 .P |
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18 MH had been considered an all-in-one system for mail handling. |
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19 The community around nmh has a similar understanding. |
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20 In fundamental difference, mmh shall be a MUA only. |
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21 I believe that the development of all-in-one mail systems is obsolete. |
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22 Today, email is too complex to be fully covered by single projects. |
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23 Such a project won't be able to excel in all aspects. |
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24 Instead, the aspects of email should be covered my multiple projects, |
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25 which then can be combined to form a complete system. |
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26 Excellent implementations for the various aspects of email exist already. |
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27 Just to name three examples: Postfix is a specialized MTA, |
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28 Procmail is a specialized MDA, and Fetchmail is a specialized MRA. |
89 | 29 I believe that it is best to use such specialized tools instead of |
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30 providing the same function again as a side-component in the project. |
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31 .P |
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32 Doing something well, requires to focus on a small set of specific aspects. |
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33 Under the assumption that focused development produces better results |
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34 in the particular area, specialized projects will be superior |
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35 in their field of focus. |
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36 Hence, all-in-one mail system projects \(en no matter if monolithic |
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37 or modular \(en will never be the best choice in any of the fields. |
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38 Even in providing the best consistent all-in-one system they are likely |
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39 to be beaten by projects that focus only on integrating existing mail |
89 | 40 components to a homogeneous system. |
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41 .P |
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42 The limiting resource in Free Software community development |
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43 is usually man power. |
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44 If the development power is spread over a large development area, |
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45 it becomes even more difficult to compete with the specialists in the |
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46 various fields. |
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47 The concrete situation for MH-based mail systems is even tougher, |
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48 given the small and aged community, including both developers and users, |
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49 it has. |
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50 .P |
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51 In consequence, I believe that the available development resources |
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52 should focus on the point where MH is most unique. |
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53 This is clearly the user interface \(en the MUA. |
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54 Peripheral parts should be removed to streamline mmh for the MUA task. |
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55 |
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56 |
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57 .H2 "Mail Transfer Facilities |
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58 .P |
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59 In contrast to nmh, which also provides mail submission and mail retrieval |
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60 agents, mmh is a MUA only. |
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61 This general difference initiated the development of mmh. |
66
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62 Removing the mail transfer facilities had been the first work task |
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63 in the mmh project. |
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64 .P |
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65 Focusing on one mail agent role only is motivated by Eric Allman's |
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66 experience with Sendmail. |
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67 He identified limiting Sendmail the MTA task had be one reason for |
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68 its success: |
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69 .[ [ |
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70 costales sendmail |
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71 .], p. xviii] |
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72 .QS |
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73 Second, I limited myself to the routing function \(en |
110 | 74 I wouldn't write user agents or delivery back-ends. |
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75 This was a departure of the dominant through of the time, |
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76 in which routing logic, local delivery, and often the network code |
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77 were incorporated directly into the user agents. |
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78 .QE |
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79 .P |
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80 In mmh, the Mail Submission Agent (MSA) is called |
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81 \fIMessage Transfer Service\fP (MTS). |
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82 This facility, implemented by the |
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83 .Pn post |
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84 command, established network connections and spoke SMTP to submit |
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85 messages for relay to the outside world. |
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86 The changes in email demanded changes in this part of nmh too. |
89 | 87 Encryption and authentication for network connections |
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88 needed to be supported, hence TLS and SASL were introduced into nmh. |
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89 This added complexity to nmh without improving it in its core functions. |
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90 Also, keeping up with recent developments in the field of |
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91 mail transfer requires development power and specialists. |
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92 In mmh this whole facility was simply cut off. |
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93 .Ci f6aa95b724fd8c791164abe7ee5468bf5c34f226 |
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94 .Ci fecd5d34f65597a4dfa16aeabea7d74b191532c3 |
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95 .Ci 156d35f6425bea4c1ed3c4c79783dc613379c65b |
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96 Instead, mmh depends on an external MSA. |
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97 The only outgoing interface available to mmh is the |
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98 .Pn sendmail |
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99 command, which almost any MSA provides. |
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100 If not, a wrapper program can be written. |
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101 It must read the message from the standard input, extract the |
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102 recipient addresses from the message header, and hand the message |
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103 over to the MSA. |
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104 For example, a wrapper script for qmail would be: |
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105 .VS |
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106 #!/bin/sh |
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107 # ignore command line arguments |
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108 exec qmail-inject |
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109 VE |
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110 The requirement to parse the recipient addresses out of the message header |
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111 is likely to be removed in the future. |
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112 Then mmh would give the recipient addresses as command line arguments. |
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113 This appears to be the better interface. |
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114 .\" XXX implement it |
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115 .P |
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116 To retrieve mail, the |
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117 .Pn inc |
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118 command acted as Mail Retrieval Agent (MRA). |
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119 It established network connections |
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120 and spoke POP3 to retrieve mail from remote servers. |
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121 As with mail submission, the network connections required encryption and |
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122 authentication, thus TLS and SASL were added. |
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123 Support for message retrieval through IMAP will become necessary |
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124 to be added soon, too, and likewise for any other changes in mail transfer. |
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125 Not so for mmh because it has dropped the support for retrieving mail |
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126 from remote locations. |
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127 .Ci ab7b48411962d26439f92f35ed084d3d6275459c |
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128 Instead, it depends on an external tool to cover this task. |
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129 In mmh exist two paths for messages to enter mmh's mail storage: |
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130 (1) Mail can be incorporated with |
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131 .Pn inc |
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132 from the system maildrop, or (2) with |
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133 .Pn rcvstore |
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134 by reading them, one at a time, from the standard input. |
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135 .P |
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136 With the removal of the MSA and MRA, mmh converted from an all-in-one |
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137 mail system to being a MUA only. |
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138 Now, of course, mmh depends on third-party software. |
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139 An external MSA is required to transfer mail to the outside world; |
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140 an external MRA is required to retrieve mail from remote machines. |
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141 There exist excellent implementations of such software, |
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142 which do this specific task likely better than the internal |
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143 versions had done it. |
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144 Also, the best suiting programs can be freely chosen. |
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145 .P |
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146 As it had already been possible to use an external MSA or MRA, |
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147 why not keep the internal version for convenience? |
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148 The question whether there is sense in having a fall-back pager in all |
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149 the command line tools, for the cases when |
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150 .Pn more |
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151 or |
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152 .Pn less |
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153 aren't available, appears to be ridiculous. |
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154 Of course, MSAs and MRAs are more complex than text pagers |
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155 and not necessarily available but still the concept of orthogonal |
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156 design holds: ``Write programs that do one thing and do it well.'' |
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157 .[ |
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158 mcilroy unix phil |
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159 p. 53 |
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160 .] |
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161 .[ |
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162 mcilroy bstj foreword |
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163 .] |
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164 Here, this part of the Unix philosophy was applied not only |
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165 to the programs but to the project itself. |
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166 In other words: |
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167 ``Develop projects that focus on one thing and do it well.'' |
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168 Projects grown complex should be split for the same reasons programs grown |
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169 complex should be split. |
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170 If it is conceptionally more elegant to have the MSA and MRA as |
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171 separate projects then they should be separated. |
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172 This is the case here, in my opinion. |
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173 The RFCs propose this separation by clearly distinguishing the different |
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174 mail handling tasks. |
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175 .[ |
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176 rfc 821 |
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177 .] |
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178 The small interfaces between the mail agents support the separation. |
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179 .P |
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180 In the beginning, email had been small and simple. |
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181 At that time, |
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182 .Pn /bin/mail |
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183 had covered anything there was to email and still had been small |
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184 and simple. |
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185 Later, the essential complexity of email increased. |
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186 (Essential complexity is the complexity defined by the problem itself.\0 |
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187 .[[ |
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188 brooks no silver bullet |
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189 .]]) |
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190 Email systems reacted to this change: They grew. |
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191 RFCs started to introduce the concept of mail agents to separate the |
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192 various tasks because they became more extensive and new tasks appeared. |
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193 As the mail systems grew even more, parts were split off. |
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194 In nmh, for instance, the POP server, which was included in the original |
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195 MH, was removed. |
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196 Now is the time to go one step further and split the MSA and MRA off, too. |
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197 Not only does this decrease the code size of the project, |
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198 but, more important, it unburdens mmh of the whole field of |
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199 message transfer with all its implications for the project. |
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200 There is no more need to concern with changes in network transfer. |
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201 This independence is received by depending on an external program |
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202 that covers the field. |
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203 Today, this is a reasonable exchange. |
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204 .P |
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205 Functionality can be added in three different ways: |
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206 .BU |
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207 Implementing the function originally in the project. |
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208 .BU |
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209 Depending on a library that provides the function. |
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210 .BU |
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211 Depending on a program that provides the function. |
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212 .P |
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213 Whereas adding the function originally to the project increases the |
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214 code size most and requires most maintenance and development work, |
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215 it makes the project most independent of other software. |
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216 Using libraries or external programs require less maintenance work |
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217 but introduces dependencies on external software. |
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218 Programs have the smallest interfaces and provide the best separation |
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219 but possibly limit the information exchange. |
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220 External libraries are stronger connected than external programs, |
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221 thus information can be exchanged more flexible. |
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222 Adding code to a project increases maintenance work. |
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223 .\" XXX ref |
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224 Implementing complex functions originally in the project adds |
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225 a lot of code. |
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226 This should be avoided if possible. |
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227 Hence, the dependencies only change in kind, not in their existence. |
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228 In mmh, library dependencies on |
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229 .Pn libsasl2 |
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230 and |
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231 .Pn libcrypto /\c |
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232 .Pn libssl |
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233 were treated against program dependencies on an MSA and an MRA. |
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234 This also meant treating build-time dependencies against run-time |
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235 dependencies. |
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236 Besides program dependencies providing the stronger separation |
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237 and being more flexible, they also allowed |
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238 over 6\|000 lines of code to be removed from mmh. |
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239 This made mmh's code base about 12\|% smaller. |
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240 Reducing the project's code size by such an amount without actually |
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241 losing functionality is a convincing argument. |
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242 Actually, as external MSAs and MRAs are likely superior to the |
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243 project's internal versions, the common user even gains functionality. |
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244 .P |
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245 Users of MH should not have problems to set up an external MSA and MRA. |
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246 Also, the popular MSAs and MRAs have large communities and a lot |
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247 of documentation available. |
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248 Choices for MSAs range from full-featured MTAs like |
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249 .I Postfix |
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250 over mid-size MTAs like |
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251 .I masqmail |
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252 and |
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253 .I dma |
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254 to small forwarders like |
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255 .I ssmtp |
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256 and |
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257 .I nullmailer . |
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258 Choices for MRAs include |
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259 .I fetchmail , |
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260 .I getmail , |
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261 .I mpop |
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262 and |
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263 .I fdm . |
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264 |
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265 |
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266 .H2 "Non-MUA Tools |
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267 .P |
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268 One goal of mmh is to remove the tools that are not part of the MUA's task. |
89 | 269 Further more, any tools that don't improve the MUA's job significantly |
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270 should be removed. |
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271 Loosely related and rarely used tools distract from the lean appearance. |
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272 They require maintenance work without adding much to the core task. |
125
0e102cec0c73
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273 By removing these tools, the project shall become more streamlined |
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274 and focused. |
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275 In mmh the following tools are not available anymore: |
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276 .BU |
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277 .Pn conflict |
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278 was removed |
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279 .Ci 8b235097cbd11d728c07b966cf131aa7133ce5a9 |
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280 because it is a mail system maintenance tool that is not MUA-related. |
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281 It even checked |
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282 .Fn /etc/passwd |
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283 and |
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284 .Fn /etc/group |
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285 for consistency, which is completely unrelated to email. |
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286 A tool like |
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287 .Pn conflict |
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288 is surely useful, but it should not be shipped with mmh. |
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289 .\" XXX historic reasons? |
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290 .BU |
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291 .Pn rcvtty |
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292 was removed |
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293 .Ci 14767c94b3827be7c867196467ed7aea5f6f49b0 |
89 | 294 because its use case of writing to the user's terminal |
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295 on receiving of mail is obsolete. |
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296 If users like to be informed of new mail, the shell's |
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297 .Ev MAILPATH |
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298 variable or graphical notifications are technically more appealing. |
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299 Writing directly to terminals is hardly ever wanted today. |
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300 If though one wants to have it this way, the standard tool |
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301 .Pn write |
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302 can be used in a way similar to: |
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303 .VS |
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304 scan -file - | write `id -un` |
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305 VE |
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306 .BU |
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307 .Pn viamail |
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308 was removed |
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309 .Ci eda72d6a7a7c20ff123043fb7f19c509ea01f932 |
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310 when the new attachment system was activated, because |
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311 .Pn forw |
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312 could then cover the task itself. |
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313 The program |
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314 .Pn sendfiles |
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315 was rewritten as a shell script wrapper around |
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316 .Pn forw . |
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317 .Ci 0e82199cf3c991a173e0ac8aa776efdb3ded61e6 |
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318 .BU |
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319 .Pn msgchk |
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320 was removed |
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321 .Ci bb9360ead7eb7a3fedcce2eeedfc660014e41dbe , |
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322 because it lost its use case when POP support was removed. |
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323 A call to |
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324 .Pn msgchk |
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325 provided hardly more information than: |
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326 .VS |
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327 ls -l /var/mail/meillo |
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328 VE |
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329 It did distinguish between old and new mail, but |
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330 this detail information can be retrieved with |
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331 .Pn stat (1), |
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332 too. |
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333 A small shell script could be written to print the information |
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334 in a similar way, if truly necessary. |
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335 As mmh's |
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336 .Pn inc |
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337 only incorporates mail from the user's local maildrop, |
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338 and thus no data transfers over slow networks are involved, |
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339 there's hardly any need to check for new mail before incorporating it. |
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340 .BU |
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341 .Pn msh |
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342 was removed |
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343 .Ci 916690191222433a6923a4be54b0d8f6ac01bd02 |
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344 because the tool was in conflict with the philosophy of MH. |
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345 It provided an interactive shell to access the features of MH, |
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346 but it wasn't just a shell, tailored to the needs of mail handling. |
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347 Instead it was one large program that had several MH tools built in. |
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348 This conflicts with the major feature of MH of being a tool chest. |
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349 .Pn msh 's |
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350 main use case had been accessing Bulletin Boards, which have seized to |
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351 be popular. |
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352 .P |
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353 Removing |
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354 .Pn msh , |
76
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355 together with the truly archaic code relicts |
58
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356 .Pn vmh |
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357 and |
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358 .Pn wmh , |
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359 saved more than 7\|000 lines of C code \(en |
66
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360 about 15\|% of the project's original source code amount. |
100
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361 Having less code \(en with equal readability, of course \(en |
76
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362 for the same functionality is an advantage. |
63 | 363 Less code means less bugs and less maintenance work. |
76
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364 As |
63 | 365 .Pn rcvtty |
366 and | |
367 .Pn msgchk | |
87
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368 are assumed to be rarely used and can be implemented in different ways, |
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369 why should one keep them? |
125
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370 Removing them streamlines mmh. |
63 | 371 .Pn viamail 's |
372 use case is now partly obsolete and partly covered by | |
373 .Pn forw , | |
76
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374 hence there's no reason to still maintain it. |
63 | 375 .Pn conflict |
76
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376 is not related to the mail client, and |
63 | 377 .Pn msh |
378 conflicts with the basic concept of MH. | |
76
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379 Theses two tools might still be useful, but they should not be part of mmh. |
63 | 380 .P |
76
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381 Finally, there's |
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382 .Pn slocal . |
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383 .Pn slocal |
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384 is an MDA and thus not directly MUA-related. |
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385 It should be removed from mmh, because including it conflicts with |
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386 the idea that mmh is a MUA only. |
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387 .Pn slocal |
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388 should rather become a separate project. |
87
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389 However, |
76
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390 .Pn slocal |
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391 provides rule-based processing of messages, like filing them into |
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392 different folders, which is otherwise not available in mmh. |
87
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393 Although |
76
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394 .Pn slocal |
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395 does neither pull in dependencies nor does it include a separate |
100
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396 technical area (cf. Sec. XXX), still, |
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397 it accounts for about 1\|000 lines of code that need to be maintained. |
76
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398 As |
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399 .Pn slocal |
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400 is almost self-standing, it should be split off into a separate project. |
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401 This would cut the strong connection between the MUA mmh and the MDA |
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402 .Pn slocal . |
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403 For anyone not using MH, |
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404 .Pn slocal |
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405 would become yet another independent MDA, like |
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406 .I procmail . |
100
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407 Then |
87
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408 .Pn slocal |
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409 could be installed without the complete MH system. |
76
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410 Likewise, mmh users could decide to use |
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411 .I procmail |
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412 without having a second, unused MDA, |
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413 .Pn slocal , |
76
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414 installed. |
100
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415 That appears to be conceptionally the best solution. |
76
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416 Yet, |
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417 .Pn slocal |
87
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418 is not split off. |
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419 I defer the decision over |
78 | 420 .Pn slocal |
100
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421 in need for deeper investigation. |
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422 In the meanwhile, it remains part of mmh. |
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423 That does not hurt because |
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424 .Pn slocal |
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425 is unrelated to the rest of the project. |
58
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426 |
0
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427 |
133
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428 |
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429 .H2 "\fLshow\fP and \fPmhshow\fP |
131
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430 .P |
133
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431 Since the very beginning, already in the first concept paper, |
58
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432 .Pn show |
62
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433 had been MH's message display program. |
58
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434 .Pn show |
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435 mapped message numbers and sequences to files and invoked |
58
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436 .Pn mhl |
89 | 437 to have the files formatted. |
88 | 438 With MIME, this approach wasn't sufficient anymore. |
100
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439 MIME messages can consist of multiple parts. Some parts are not |
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440 directly displayable and text content might be encoded in |
58
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441 foreign charsets. |
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442 .Pn show 's |
76
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443 understanding of messages and |
58
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444 .Pn mhl 's |
88 | 445 display capabilities couldn't cope with the task any longer. |
62
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446 .P |
88 | 447 Instead of extending these tools, additional tools were written from |
448 scratch and added to the MH tool chest. | |
449 Doing so is encouraged by the tool chest approach. | |
450 Modular design is a great advantage for extending a system, | |
451 as new tools can be added without interfering with existing ones. | |
62
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452 First, the new MIME features were added in form of the single program |
58
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453 .Pn mhn . |
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454 The command |
82
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455 .Cl "mhn -show 42 |
58
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456 would show the MIME message numbered 42. |
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457 With the 1.0 release of nmh in February 1999, Richard Coleman finished |
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458 the split of |
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459 .Pn mhn |
88 | 460 into a set of specialized tools, which together covered the |
461 multiple aspects of MIME. | |
462 One of them was | |
69
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463 .Pn mhshow , |
88 | 464 which replaced |
465 .Cl "mhn -show" . | |
466 It was capable of displaying MIME messages appropriately. | |
62
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467 .P |
88 | 468 From then on, two message display tools were part of nmh, |
76
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469 .Pn show |
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470 and |
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471 .Pn mhshow . |
88 | 472 To ease the life of users, |
69
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473 .Pn show |
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474 was extended to automatically hand the job over to |
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475 .Pn mhshow |
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476 if displaying the message would be beyond |
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477 .Pn show 's |
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478 abilities. |
88 | 479 In consequence, the user would simply invoke |
69
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480 .Pn show |
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481 (possibly through |
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482 .Pn next |
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483 or |
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484 .Pn prev ) |
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485 and get the message printed with either |
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486 .Pn show |
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487 or |
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488 .Pn mhshow , |
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489 whatever was more appropriate. |
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490 .P |
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491 Having two similar tools for essentially the same task is redundant. |
88 | 492 Usually, |
493 users wouldn't distinguish between | |
494 .Pn show | |
495 and | |
496 .Pn mhshow | |
497 in their daily mail reading. | |
498 Having two separate display programs was therefore mainly unnecessary | |
499 from a user's point of view. | |
500 Besides, the development of both programs needed to be in sync, | |
76
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501 to ensure that the programs behaved in a similar way, |
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502 because they were used like a single tool. |
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503 Different behavior would have surprised the user. |
69
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504 .P |
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|
505 Today, non-MIME messages are rather seen to be a special case of |
100
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506 MIME messages, although it is the other way round. |
69
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507 As |
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508 .Pn mhshow |
88 | 509 had already be able to display non-MIME messages, it appeared natural |
69
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510 to drop |
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511 .Pn show |
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512 in favor of using |
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513 .Pn mhshow |
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514 exclusively. |
88 | 515 .Ci 4c1efddfd499300c7e74263e57d8aa137e84c853 |
516 Removing | |
517 .Pn show | |
518 is no loss in function, because functionally | |
519 .Pn mhshow | |
520 covers it completely. | |
521 The old behavior of | |
522 .Pn show | |
523 can still be emulated with the simple command line: | |
524 .VS | |
525 mhl `mhpath c` | |
526 VE | |
527 .P | |
76
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Rework of existing text.
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528 For convenience, |
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529 .Pn mhshow |
88 | 530 was renamed to |
531 .Pn show | |
532 after | |
533 .Pn show | |
534 was gone. | |
535 It is clear that such a rename may confuse future developers when | |
536 trying to understand the history. | |
537 Nevertheless, I consider the convenience on the user's side, | |
538 to call | |
539 .Pn show | |
540 when they want a message to be displayed, to outweigh the inconvenience | |
541 on the developer's side when understanding the project history. | |
69
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542 .P |
88 | 543 To prepare for the transition, |
69
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544 .Pn mhshow |
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545 was reworked to behave more like |
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546 .Pn show |
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547 first. |
88 | 548 (cf. Sec. XXX) |
549 Once the tools behaved more alike, the replacing appeared to be | |
550 even more natural. | |
551 Today, mmh's new | |
69
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552 .Pn show |
88 | 553 became the one single message display program again, with the difference |
554 that today it handles MIME messages as well as non-MIME messages. | |
555 The outcome of the transition is one program less to maintain, | |
556 no second display program for users to deal with, | |
557 and less system complexity. | |
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558 .P |
88 | 559 Still, removing the old |
69
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560 .Pn show |
88 | 561 hurts in one regard: It had been such a simple program. |
562 Its lean elegance is missing to the new | |
69
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563 .Pn show . |
88 | 564 But there is no chance; |
565 supporting MIME demands for higher essential complexity. | |
58
814c33b96d89
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566 |
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|
567 |
133
02660c14f6a8
Further re-ordering of the sections.
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568 .H2 "Scan Listings |
131
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569 .P |
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570 FIXME XXX |
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571 |
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572 .P |
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|
573 commit c20e315f9fb9f0f0955749726dbf4fd897cd9f48 |
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574 Author: markus schnalke <meillo@marmaro.de> |
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575 Date: Fri Dec 9 21:56:44 2011 +0100 |
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576 |
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577 Adjusted the default scan listing: remove the body preview |
7c741bc8f719
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578 The original listing is still available as etc/scan.nmh |
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579 |
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580 commit 70b2643e0da8485174480c644ad9785c84f5bff4 |
7c741bc8f719
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581 Author: markus schnalke <meillo@marmaro.de> |
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582 Date: Mon Jan 30 16:16:26 2012 +0100 |
7c741bc8f719
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583 |
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584 Scan listings shall not contain body content. Hence, removed this feature. |
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585 Scan listings shall operator on message headers and non-message information |
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586 only. Displaying the beginning of the body complicates everything too much. |
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587 That's no surprise, because it's something completely different. If you |
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588 want to examine the body, then use show(1)/mhshow(1). |
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diff
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589 Changed the default scan formats accordingly. |
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590 |
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591 |
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Reorganized: Converted 4-parted discussion into 3-parted discussion.
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diff
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|
592 |
133
02660c14f6a8
Further re-ordering of the sections.
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|
593 |
100
6ae7dc4a3a02
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diff
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|
594 .H2 "Configure Options |
58
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parents:
51
diff
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|
595 .P |
76
2e61e0004a8f
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74
diff
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|
596 Customization is a double-edged sword. |
2e61e0004a8f
Rework of existing text.
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597 It allows better suiting setups, but not for free. |
2e61e0004a8f
Rework of existing text.
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598 There is the cost of code complexity to be able to customize. |
2e61e0004a8f
Rework of existing text.
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diff
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599 There is the cost of less tested setups, because there are |
72
bae9273b5802
Wrote about configure options (not finished yet).
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69
diff
changeset
|
600 more possible setups and especially corner-cases. |
76
2e61e0004a8f
Rework of existing text.
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parents:
74
diff
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|
601 And, there is the cost of choice itself. |
2e61e0004a8f
Rework of existing text.
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74
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602 The code complexity directly affects the developers. |
72
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Wrote about configure options (not finished yet).
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69
diff
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603 Less tested code affects both, users and developers. |
76
2e61e0004a8f
Rework of existing text.
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|
604 The problem of choice affects the users, for once by having to |
100
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diff
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|
605 choose, but also by more complex interfaces that require more documentation. |
72
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parents:
69
diff
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|
606 Whenever options add little advantages, they should be considered for |
bae9273b5802
Wrote about configure options (not finished yet).
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parents:
69
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|
607 removal. |
bae9273b5802
Wrote about configure options (not finished yet).
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|
608 I have reduced the number of project-specific configure options from |
bae9273b5802
Wrote about configure options (not finished yet).
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parents:
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|
609 fifteen to three. |
74
cefaa856d431
A lot of new text about configure switches.
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diff
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|
610 |
76
2e61e0004a8f
Rework of existing text.
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diff
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|
611 .U3 "Mail Transfer Facilities |
74
cefaa856d431
A lot of new text about configure switches.
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|
612 .P |
85
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Extended the text about mail transfer configure options.
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diff
changeset
|
613 With the removal of the mail transfer facilities five configure |
fb0d1b4c8fb1
Extended the text about mail transfer configure options.
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parents:
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diff
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|
614 options vanished: |
fb0d1b4c8fb1
Extended the text about mail transfer configure options.
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parents:
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diff
changeset
|
615 .P |
fb0d1b4c8fb1
Extended the text about mail transfer configure options.
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parents:
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diff
changeset
|
616 The switches |
fb0d1b4c8fb1
Extended the text about mail transfer configure options.
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diff
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|
617 .Sw --with-tls |
fb0d1b4c8fb1
Extended the text about mail transfer configure options.
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parents:
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diff
changeset
|
618 and |
fb0d1b4c8fb1
Extended the text about mail transfer configure options.
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parents:
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diff
changeset
|
619 .Sw --with-cyrus-sasl |
89 | 620 had activated the support for transfer encryption and authentication. |
85
fb0d1b4c8fb1
Extended the text about mail transfer configure options.
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parents:
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diff
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|
621 This is not needed anymore. |
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622 .Ci fecd5d34f65597a4dfa16aeabea7d74b191532c3 |
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623 .Ci 156d35f6425bea4c1ed3c4c79783dc613379c65b |
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|
624 .P |
fb0d1b4c8fb1
Extended the text about mail transfer configure options.
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diff
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|
625 The configure switch |
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Extended the text about mail transfer configure options.
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|
626 .Sw --enable-pop |
fb0d1b4c8fb1
Extended the text about mail transfer configure options.
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diff
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|
627 activated the message retrieval facility. |
fb0d1b4c8fb1
Extended the text about mail transfer configure options.
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84
diff
changeset
|
628 The code area that would be conditionally compiled in for TLS and SASL |
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Extended the text about mail transfer configure options.
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|
629 support had been small. |
fb0d1b4c8fb1
Extended the text about mail transfer configure options.
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|
630 The conditionally compiled code area for POP support had been much larger. |
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Extended the text about mail transfer configure options.
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|
631 Whereas the code base changes would only slightly change on toggling |
fb0d1b4c8fb1
Extended the text about mail transfer configure options.
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|
632 TLS or SASL support, it changed much on toggling POP support. |
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|
633 The changes in the code base could hardly be overviewed. |
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|
634 By having POP support togglable a second code base had been created, |
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|
635 one that needed to be tested. |
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diff
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|
636 This situation is basically similar for the conditional TLS and SASL |
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|
637 code, but there the changes are minor and can yet be overviewed. |
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|
638 Still, conditional compilation of a code base creates variations |
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Extended the text about mail transfer configure options.
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639 of the original program. |
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|
640 More variations require more testing and maintenance work. |
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diff
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|
641 .P |
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diff
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|
642 Two other options only specified default configuration values: |
100
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643 .Sw --with-mts |
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644 defined the default transport service, either |
6ae7dc4a3a02
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|
645 .Ar smtp |
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Included changes proposed by Lydi.
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diff
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|
646 or |
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Included changes proposed by Lydi.
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|
647 .Ar sendmail . |
85
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diff
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|
648 In mmh this fixed to |
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diff
changeset
|
649 .Ar sendmail . |
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84
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|
650 .Ci f6aa95b724fd8c791164abe7ee5468bf5c34f226 |
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diff
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|
651 With |
100
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Included changes proposed by Lydi.
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changeset
|
652 .Sw --with-smtpservers |
85
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diff
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|
653 default SMTP servers for the |
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Extended the text about mail transfer configure options.
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|
654 .Ar smtp |
fb0d1b4c8fb1
Extended the text about mail transfer configure options.
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diff
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|
655 transport service could be specified. |
72
bae9273b5802
Wrote about configure options (not finished yet).
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69
diff
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|
656 .Ci 128545e06224233b7e91fc4c83f8830252fe16c9 |
85
fb0d1b4c8fb1
Extended the text about mail transfer configure options.
markus schnalke <meillo@marmaro.de>
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84
diff
changeset
|
657 Both of them became irrelevant. |
72
bae9273b5802
Wrote about configure options (not finished yet).
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diff
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|
658 |
74
cefaa856d431
A lot of new text about configure switches.
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72
diff
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|
659 .U3 "Backup Prefix |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
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72
diff
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|
660 .P |
76
2e61e0004a8f
Rework of existing text.
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parents:
74
diff
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|
661 The backup prefix is the string that was prepended to message |
2e61e0004a8f
Rework of existing text.
markus schnalke <meillo@marmaro.de>
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74
diff
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|
662 filenames to tag them as deleted. |
2e61e0004a8f
Rework of existing text.
markus schnalke <meillo@marmaro.de>
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diff
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|
663 By default it had been the comma character `\f(CW,\fP'. |
78 | 664 In July 2000, Kimmo Suominen introduced |
665 the configure option | |
666 .Sw --with-hash-backup | |
667 to change the default to the hash symbol `\f(CW#\fP'. | |
668 The choice was probably personal preference, because first, the | |
669 option was named | |
670 .Sw --with-backup-prefix. | |
671 and had the prefix symbol as argument. | |
100
6ae7dc4a3a02
Included changes proposed by Lydi.
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diff
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|
672 But giving the hash symbol as argument caused too many problems |
6ae7dc4a3a02
Included changes proposed by Lydi.
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98
diff
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|
673 for Autoconf, |
6ae7dc4a3a02
Included changes proposed by Lydi.
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98
diff
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|
674 thus the option was limited to use the hash symbol as the default prefix. |
6ae7dc4a3a02
Included changes proposed by Lydi.
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parents:
98
diff
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|
675 This supports the assumption, that the choice for the hash was |
6ae7dc4a3a02
Included changes proposed by Lydi.
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98
diff
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|
676 personal preference only. |
6ae7dc4a3a02
Included changes proposed by Lydi.
markus schnalke <meillo@marmaro.de>
parents:
98
diff
changeset
|
677 Being related or not, words that start with the hash symbol |
78 | 678 introduce a comment in the Unix shell. |
72
bae9273b5802
Wrote about configure options (not finished yet).
markus schnalke <meillo@marmaro.de>
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69
diff
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|
679 Thus, the command line |
bae9273b5802
Wrote about configure options (not finished yet).
markus schnalke <meillo@marmaro.de>
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69
diff
changeset
|
680 .Cl "rm #13 #15 |
bae9273b5802
Wrote about configure options (not finished yet).
markus schnalke <meillo@marmaro.de>
parents:
69
diff
changeset
|
681 calls |
bae9273b5802
Wrote about configure options (not finished yet).
markus schnalke <meillo@marmaro.de>
parents:
69
diff
changeset
|
682 .Pn rm |
bae9273b5802
Wrote about configure options (not finished yet).
markus schnalke <meillo@marmaro.de>
parents:
69
diff
changeset
|
683 without arguments because the first hash symbol starts the comment |
bae9273b5802
Wrote about configure options (not finished yet).
markus schnalke <meillo@marmaro.de>
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69
diff
changeset
|
684 that reaches until the end of the line. |
bae9273b5802
Wrote about configure options (not finished yet).
markus schnalke <meillo@marmaro.de>
parents:
69
diff
changeset
|
685 To delete the backup files, |
bae9273b5802
Wrote about configure options (not finished yet).
markus schnalke <meillo@marmaro.de>
parents:
69
diff
changeset
|
686 .Cl "rm ./#13 ./#15" |
bae9273b5802
Wrote about configure options (not finished yet).
markus schnalke <meillo@marmaro.de>
parents:
69
diff
changeset
|
687 needs to be used. |
100
6ae7dc4a3a02
Included changes proposed by Lydi.
markus schnalke <meillo@marmaro.de>
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98
diff
changeset
|
688 Using the hash as backup prefix can be seen as a precaution against |
78 | 689 data loss. |
690 .P | |
72
bae9273b5802
Wrote about configure options (not finished yet).
markus schnalke <meillo@marmaro.de>
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69
diff
changeset
|
691 I removed the configure option but added the profile entry |
bae9273b5802
Wrote about configure options (not finished yet).
markus schnalke <meillo@marmaro.de>
parents:
69
diff
changeset
|
692 .Pe backup-prefix , |
bae9273b5802
Wrote about configure options (not finished yet).
markus schnalke <meillo@marmaro.de>
parents:
69
diff
changeset
|
693 which allows to specify an arbitrary string as backup prefix. |
bae9273b5802
Wrote about configure options (not finished yet).
markus schnalke <meillo@marmaro.de>
parents:
69
diff
changeset
|
694 .Ci 6c40d481d661d532dd527eaf34cebb6d3f8ed086 |
76
2e61e0004a8f
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
74
diff
changeset
|
695 Profile entries are the common method to change mmh's behavior. |
2e61e0004a8f
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
74
diff
changeset
|
696 This change did not remove the choice but moved it to a location where |
72
bae9273b5802
Wrote about configure options (not finished yet).
markus schnalke <meillo@marmaro.de>
parents:
69
diff
changeset
|
697 it suited better. |
76
2e61e0004a8f
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
74
diff
changeset
|
698 .P |
78 | 699 Eventually, however, the new trash folder concept |
700 .Cf "Sec. XXX | |
701 obsoleted the concept of the backup prefix completely. | |
702 .Ci 8edc5aaf86f9f77124664f6801bc6c6cdf258173 | |
133
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
703 .Ci ca0b3e830b86700d9e5e31b1784de2bdcaf58fc5 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
704 |
76
2e61e0004a8f
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
74
diff
changeset
|
705 |
2e61e0004a8f
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
74
diff
changeset
|
706 .U3 "Editor and Pager |
74
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
707 .P |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
708 The two configure options |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
709 .CW --with-editor=EDITOR |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
710 .CW --with-pager=PAGER |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
711 were used to specify the default editor and pager at configure time. |
109
2b094b8fb422
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
108
diff
changeset
|
712 Doing so at configure time made sense in the eighties, |
76
2e61e0004a8f
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
74
diff
changeset
|
713 when the set of available editors and pagers varied much across |
2e61e0004a8f
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
74
diff
changeset
|
714 different systems. |
89 | 715 Today, the situation is more homogeneous. |
74
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
716 The programs |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
717 .Pn vi |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
718 and |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
719 .Pn more |
76
2e61e0004a8f
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
74
diff
changeset
|
720 can be expected to be available on every Unix system, |
74
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
721 as they are specified by POSIX since two decades. |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
722 (The specifications for |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
723 .Pn vi |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
724 and |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
725 .Pn more |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
726 appeared in |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
727 .[ |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
728 posix 1987 |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
729 .] |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
730 and, |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
731 .[ |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
732 posix 1992 |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
733 .] |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
734 respectively.) |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
735 As a first step, these two tools were hard-coded as defaults. |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
736 .Ci 5d43a99db70c12a673028c7758c20cbe3e13ef5f |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
737 Not changed were the |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
738 .Pe editor |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
739 and |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
740 .Pe moreproc |
76
2e61e0004a8f
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
74
diff
changeset
|
741 profile entries, which allowed the user to override the system defaults. |
74
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
742 Later, the concept was reworked to respect the standard environment |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
743 variables |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
744 .Ev VISUAL |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
745 and |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
746 .Ev PAGER |
76
2e61e0004a8f
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
74
diff
changeset
|
747 if they are set. |
74
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
748 Today, mmh determines the editor to use in the following order, |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
749 taking the first available and non-empty item: |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
750 .IP (1) |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
751 Environment variable |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
752 .Ev MMHEDITOR |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
753 .IP (2) |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
754 Profile entry |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
755 .Pe Editor |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
756 .IP (3) |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
757 Environment variable |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
758 .Ev VISUAL |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
759 .IP (4) |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
760 Environment variable |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
761 .Ev EDITOR |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
762 .IP (5) |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
763 Command |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
764 .Pn vi . |
72
bae9273b5802
Wrote about configure options (not finished yet).
markus schnalke <meillo@marmaro.de>
parents:
69
diff
changeset
|
765 .P |
76
2e61e0004a8f
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
74
diff
changeset
|
766 .Ci f85f4b7ae62e3d05a945dcd46ead51f0a2a89a9b |
2e61e0004a8f
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
74
diff
changeset
|
767 .P |
89 | 768 The pager to use is determined in a similar order, |
74
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
769 also taking the first available and non-empty item: |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
770 .IP (1) |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
771 Environment variable |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
772 .Ev MMHPAGER |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
773 .IP (2) |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
774 Profile entry |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
775 .Pe Pager |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
776 (replaces |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
777 .Pe moreproc ) |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
778 .IP (3) |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
779 Environment variable |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
780 .Ev PAGER |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
781 .IP (4) |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
782 Command |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
783 .Pn more . |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
784 .P |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
785 .Ci 0c4214ea2aec6497d0d67b436bbee9bc1d225f1e |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
786 .P |
76
2e61e0004a8f
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
74
diff
changeset
|
787 By respecting the |
74
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
788 .Ev VISUAL /\c |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
789 .Ev EDITOR |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
790 and |
cefaa856d431
A lot of new text about configure switches.
markus schnalke <meillo@marmaro.de>
parents:
72
diff
changeset
|
791 .Ev PAGER |
76
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792 environment variables, |
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793 the new behavior confirms better to the common style on Unix systems. |
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794 Additionally, the new approach is more uniform and clearer to users. |
72
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795 |
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796 |
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797 .U3 "ndbm |
74
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798 .P |
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799 .Pn slocal |
78 | 800 used to depend on |
74
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801 .I ndbm , |
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802 a database library. |
76
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803 The database is used to store the `\fLMessage-ID\fP's of all |
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804 messages delivered. |
74
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805 This enables |
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806 .Pn slocal |
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807 to suppress delivering the same message to the same user twice. |
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808 (This features was enabled by the |
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809 .Sw -suppressdup |
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810 switch.) |
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811 .P |
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812 A variety of versions of the database library exist. |
78 | 813 .[ |
814 wolter unix incompat notes dbm | |
815 .] | |
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816 Complicated autoconf code was needed to detect them correctly. |
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817 Further more, the configure switches |
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818 .Sw --with-ndbm=ARG |
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819 and |
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820 .Sw --with-ndbmheader=ARG |
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821 were added to help with difficult setups that would |
78 | 822 not be detected automatically or correctly. |
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823 .P |
74
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824 By removing the suppress duplicates feature of |
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825 .Pn slocal , |
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826 the dependency on |
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827 .I ndbm |
78 | 828 vanished and 120 lines of complex autoconf code could be saved. |
74
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829 .Ci ecd6d6a20cb7a1507e3a20d6c4cb3a1cf14c6bbf |
89 | 830 The change removed functionality too, but that is minor to the |
78 | 831 improvement by dropping the dependency and the complex autoconf code. |
74
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832 |
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833 .U3 "mh-e Support |
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834 .P |
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835 The configure option |
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836 .Sw --disable-mhe |
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837 was removed when the mh-e support was reworked. |
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838 Mh-e is the Emacs front-end to MH. |
76
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839 It requires MH to provide minor additional functions. |
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840 The |
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841 .Sw --disable-mhe |
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842 configure option could switch these extensions off. |
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843 After removing the support for old versions of mh-e, |
74
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844 only the |
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845 .Sw -build |
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846 switches of |
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847 .Pn forw |
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848 and |
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849 .Pn repl |
76
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850 are left to be mh-e extensions. |
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851 They are now always built in because they add little code and complexity. |
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852 In consequence, the |
74
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853 .Sw --disable-mhe |
76
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854 configure option was removed |
72
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855 .Ci a7ce7b4a580d77b6c2c4d980812beb589aa4c643 |
74
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856 Removing the option removed a second code setup that would have |
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857 needed to be tested. |
76
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858 This change was first done in nmh and thereafter merged into mmh. |
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859 .P |
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860 The interface changes in mmh require mh-e to be adjusted in order |
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861 to be able to use mmh as back-end. |
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862 This will require minor changes to mh-e, but removing the |
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863 .Sw -build |
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|
864 switches would require more rework. |
72
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865 |
74
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866 .U3 "Masquerading |
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867 .P |
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868 The configure option |
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869 .Sw --enable-masquerade |
76
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870 could take up to three arguments: |
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|
871 `draft_from', `mmailid', and `username_extension'. |
74
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872 They activated different types of address masquerading. |
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873 All of them were implemented in the SMTP-speaking |
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874 .Pn post |
76
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|
875 command, which provided an MSA. |
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876 Address masquerading is an MTA's task and mmh does not cover |
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|
877 this field anymore. |
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878 Hence, true masquerading needs to be implemented in the external MTA. |
72
bae9273b5802
Wrote about configure options (not finished yet).
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879 .P |
74
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|
880 The |
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|
881 .I mmailid |
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882 masquerading type is the oldest one of the three and the only one |
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883 available in the original MH. |
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884 It provided a |
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|
885 .I username |
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|
886 to |
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887 .I fakeusername |
76
2e61e0004a8f
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|
888 mapping, based on the password file's GECOS field. |
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889 The man page |
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890 .Mp mh-tailor(5) |
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891 described the use case as being the following: |
98
d894191d7a33
style: Changed the block quote approach. New QS and QE.
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892 .QS |
74
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893 This is useful if you want the messages you send to always |
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894 appear to come from the name of an MTA alias rather than your |
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895 actual account name. For instance, many organizations set up |
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896 `First.Last' sendmail aliases for all users. If this is |
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897 the case, the GECOS field for each user should look like: |
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898 ``First [Middle] Last <First.Last>'' |
98
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899 .QE |
74
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900 .P |
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901 As mmh sends outgoing mail via the local MTA only, |
76
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902 the best location to do such global rewrites is there. |
74
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903 Besides, the MTA is conceptionally the right location because it |
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|
904 does the reverse mapping for incoming mail (aliasing), too. |
76
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905 Further more, masquerading set up there is readily available for all |
74
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906 mail software on the system. |
76
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907 Hence, mmailid masquerading was removed. |
74
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908 .Ci 0836c8000ccb34b59410ef1c15b1b7feac70ce5f |
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909 .P |
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|
910 The |
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|
911 .I username_extension |
76
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|
912 masquerading type did not replace the username but would append a suffix, |
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|
913 specified by the |
74
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|
914 .Ev USERNAME_EXTENSION |
76
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|
915 environment variable, to it. |
2e61e0004a8f
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|
916 This provided support for the |
74
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|
917 .I user-extension |
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|
918 feature of qmail and the similar |
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|
919 .I "plussed user |
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920 processing of sendmail. |
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921 The decision to remove this username_extension masquerading was |
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922 motivated by the fact that |
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923 .Pn spost |
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924 hadn't supported it already. |
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925 .Ci 2abae0bfd0ad5bf898461e50aa4b466d641f23d9 |
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926 Username extensions are possible in mmh, but less convenient to use. |
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927 .\" XXX format file %(getenv USERNAME_EXTENSION) |
74
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928 .P |
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929 The |
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930 .I draft_from |
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931 masquerading type instructed |
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932 .Pn post |
84
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933 to use the value of the |
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934 .Hd From |
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935 header field as SMTP envelope sender. |
76
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936 Sender addresses could be replaced completely. |
74
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937 .Ci b14ea6073f77b4359aaf3fddd0e105989db9 |
76
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938 Mmh offers a kind of masquerading similar in effect, but |
74
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939 with technical differences. |
76
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940 As mmh does not transfer messages itself, the local MTA has final control |
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941 over the sender's address. Any masquerading mmh introduces may be reverted |
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942 by the MTA. |
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943 In times of pedantic spam checking, an MTA will take care to use |
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944 sensible envelope sender addresses to keep its own reputation up. |
84
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945 Nonetheless, the MUA can set the |
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946 .Hd From |
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947 header field and thereby propose |
76
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948 a sender address to the MTA. |
74
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949 The MTA may then decide to take that one or generate the canonical sender |
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950 address for use as envelope sender address. |
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|
951 .P |
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952 In mmh, the MTA will always extract the recipient and sender from the |
84
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953 message header (\c |
74
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954 .Pn sendmail 's |
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|
955 .Sw -t |
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|
956 switch). |
84
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957 The |
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958 .Hd From |
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959 header field of the draft may be set arbitrary by the user. |
74
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960 If it is missing, the canonical sender address will be generated by the MTA. |
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|
961 |
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962 .U3 "Remaining Options |
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|
963 .P |
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964 Two configure options remain in mmh. |
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965 One is the locking method to use: |
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966 .Sw --with-locking=[dot|fcntl|flock|lockf] . |
76
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967 The idea of removing all methods except the portable dot locking |
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968 and having that one as the default is appealing, but this change |
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969 requires deeper technical investigation into the topic. |
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970 The other option, |
74
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971 .Sw --enable-debug , |
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972 compiles the programs with debugging symbols and does not strip them. |
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973 This option is likely to stay. |
72
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974 |
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|
975 |
58
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|
976 |
63 | 977 |
100
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978 .H2 "Command Line Switches |
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979 .P |
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980 The command line switches of MH tools follow the X Window style. |
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981 They are words, introduced by a single dash. |
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982 For example: |
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983 .Cl "-truncate" . |
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984 Every program in mmh has two generic switches: |
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985 .Sw -help , |
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986 to print a short message on how to use the program, and |
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987 .Sw -Version , |
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988 to tell what version of mmh the program belongs to. |
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989 .P |
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990 Switches change the behavior of programs. |
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991 Programs that do one thing in one way require no switches. |
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992 In most cases, doing something in exactly one way is too limiting. |
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993 If there is basically one task to accomplish, but it should be done |
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994 in various ways, switches are a good approach to alter the behavior |
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995 of a program. |
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996 Changing the behavior of programs provides flexibility and customization |
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997 to users, but at the same time it complicates the code, documentation and |
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998 usage of the program. |
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999 .\" XXX: Ref |
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1000 Therefore, the number of switches should be kept small. |
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1001 A small set of well-chosen switches does no harm. |
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1002 But usually, the number of switches increases over time. |
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1003 Already in 1985, Rose and Romine have identified this as a major |
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1004 problem of MH: |
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1005 .[ [ |
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1006 rose romine real work |
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1007 .], p. 12] |
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1008 .QS |
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1009 A complaint often heard about systems which undergo substantial development |
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1010 by many people over a number of years, is that more and more options are |
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1011 introduced which add little to the functionality but greatly increase the |
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1012 amount of information a user needs to know in order to get useful work done. |
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1013 This is usually referred to as creeping featurism. |
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1014 .QP |
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1015 Unfortunately MH, having undergone six years of off-and-on development by |
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1016 ten or so well-meaning programmers (the present authors included), |
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1017 suffers mightily from this. |
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1018 .QE |
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1019 .P |
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1020 Being reluctant to adding new switches \(en or `options', |
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1021 as Rose and Romine call them \(en is one part of a counter-action, |
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1022 the other part is removing hardly used switches. |
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1023 Nmh's tools had lots of switches already implemented, |
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1024 hence, cleaning up by removing some of them was the more important part |
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1025 of the counter-action. |
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1026 Removing existing functionality is always difficult because it |
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1027 breaks programs that use these functions. |
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1028 Also, for every obsolete feature, there'll always be someone who still |
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1029 uses it and thus opposes its removal. |
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1030 This puts the developer into the position, |
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1031 where sensible improvements to style are regarded as destructive acts. |
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1032 Yet, living with the featurism is far worse, in my eyes, because |
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1033 future needs will demand adding further features, |
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1034 worsening the situation more and more. |
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1035 Rose and Romine added in a footnote, |
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1036 ``[...] |
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1037 .Pn send |
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1038 will no doubt acquire an endless number of switches in the years to come.'' |
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1039 Although clearly humorous, the comment points to the nature of the problem. |
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1040 Refusing to add any new switches would encounter the problem at its root, |
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1041 but this is not practical. |
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1042 New needs will require new switches and it would be unwise to block |
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1043 them strictly. |
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1044 Nevertheless, removing obsolete switches still is an effective approach |
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1045 to deal with the problem. |
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1046 Working on an experimental branch without an established user base, |
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1047 eased my work because I did not offend users when I removed existing |
110 | 1048 functions. |
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1049 .P |
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1050 Rose and Romine counted 24 visible and 9 more hidden switches for |
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1051 .Pn send . |
97
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1052 In nmh, they increased up to 32 visible and 12 hidden ones. |
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1053 At the time of writing, no more than 7 visible switches and 1 hidden switch |
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1054 have remained in mmh's |
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1055 .Pn send . |
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1056 (These numbers include two generic switches, help and version.) |
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1057 .P |
97
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1058 Fig. XXX |
93
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1059 .\" XXX Ref |
97
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1060 displays the number of switches for each of the tools that is available |
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1061 in both, nmh and mmh. |
100
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1062 The tools are sorted by the number of switches they had in nmh. |
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1063 Visible and hidden switches were counted, |
97
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1064 but not the generic help and version switches. |
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1065 Whereas in the beginning of the project, the average tool had 11 switches, |
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1066 now it has no more than 5 \(en only half as many. |
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1067 If the `no' switches and similar inverse variant are folded onto |
100
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1068 their counter-parts, the average tool had 8 switches in pre-mmh times and |
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1069 has 4 now. |
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1070 The total number of functional switches in mmh dropped from 465 |
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1071 to 234. |
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1072 |
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1073 .KS |
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1074 .in 1c |
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1075 .so input/switches.grap |
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1076 .KE |
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1077 |
58
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1078 .P |
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1079 A part of the switches vanished after functions were removed. |
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1080 This was the case for network mail transfer, for instance. |
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1081 Sometimes, however, the work flow was the other way: |
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1082 I looked through the |
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1083 .Mp mh-chart (7) |
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1084 man page to identify the tools with apparently too many switches. |
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1085 Then considering the value of each of the switches by examining |
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1086 the tool's man page and source code, aided by recherche and testing. |
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1087 This way, the removal of functions was suggested by the aim to reduce |
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1088 the number of switches per command. |
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1089 |
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1090 |
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1091 .U3 "Draft Folder Facility |
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1092 .P |
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1093 A change early in the project was the complete transition from |
93
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1094 the single draft message to the draft folder facility. |
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1095 .Ci 337338b404931f06f0db2119c9e145e8ca5a9860 |
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1096 The draft folder facility was introduced in the mid-eighties, when |
100
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1097 Rose and Romine called it a ``relatively new feature''. |
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1098 .[ |
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1099 rose romine real work |
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1100 .] |
110 | 1101 Since then, the facility had existed but was inactive by default. |
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1102 The default activation and the related rework of the tools made it |
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1103 possible to remove the |
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1104 .Sw -[no]draftfolder , |
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1105 and |
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1106 .Sw -draftmessage |
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1107 switches from |
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1108 .Pn comp , |
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1109 .Pn repl , |
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1110 .Pn forw , |
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1111 .Pn dist , |
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1112 .Pn whatnow , |
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1113 and |
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1114 .Pn send . |
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1115 .Ci 337338b404931f06f0db2119c9e145e8ca5a9860 |
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1116 The only flexibility removed with this change is having multiple |
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1117 draft folders within one profile. |
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1118 I consider this a theoretical problem only. |
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1119 In the same go, the |
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1120 .Sw -draft |
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1121 switch of |
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1122 .Pn anno , |
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1123 .Pn refile , |
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1124 and |
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1125 .Pn send |
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1126 was removed. |
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1127 The special-casing of `the' draft message became irrelevant after |
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1128 the rework of the draft system. |
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1129 (See Sec. XXX.) |
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1130 Equally, |
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1131 .Pn comp |
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1132 lost its |
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1133 .Sw -file |
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1134 switch. |
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1135 The draft folder facility, together with the |
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1136 .Sw -form |
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1137 switch, are sufficient. |
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1138 |
95
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1139 |
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1140 .U3 "In Place Editing |
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1141 .P |
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1142 .Pn anno |
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1143 had the switches |
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1144 .Sw -[no]inplace |
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1145 to either annotate the message in place and thus preserve hard links, |
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1146 or annotate a copy to replace the original message, breaking hard links. |
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1147 Following the assumption that linked messages should truly be the |
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1148 same message, and annotating it should not break the link, the |
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1149 .Sw -[no]inplace |
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1150 switches were removed and the previous default |
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1151 .Sw -inplace |
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1152 was made the only behavior. |
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1153 .Ci c8195849d2e366c569271abb0f5f60f4ebf0b4d0 |
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1154 The |
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1155 .Sw -[no]inplace |
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1156 switches of |
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1157 .Pn repl , |
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1158 .Pn forw , |
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1159 and |
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1160 .Pn dist |
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1161 could be removed, too, as they were simply passed through to |
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1162 .Pn anno . |
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1163 .P |
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1164 .Pn burst |
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1165 also had |
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1166 .Sw -[no]inplace |
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1167 switches, but with different meaning. |
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1168 With |
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1169 .Sw -inplace , |
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1170 the digest had been replaced by the table of contents (i.e. the |
110 | 1171 introduction text) and the burst messages were placed right |
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1172 after this message, renumbering all following messages. |
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1173 Also, any trailing text of the digest was lost, though, |
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1174 in practice, it usually consists of an end-of-digest marker only. |
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1175 Nontheless, this behavior appeared less elegant than the |
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1176 .Sw -noinplace |
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1177 behavior, which already had been the default. |
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1178 Nmh's |
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1179 .Mp burst (1) |
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1180 man page reads: |
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1181 .sp \n(PDu |
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1182 .QS |
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1183 If -noinplace is given, each digest is preserved, no table |
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1184 of contents is produced, and the messages contained within |
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1185 the digest are placed at the end of the folder. Other messages |
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1186 are not tampered with in any way. |
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1187 .QE |
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1188 .LP |
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1189 The decision to drop the |
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1190 .Sw -inplace |
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1191 behavior was supported by the code complexity and the possible data loss |
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1192 it caused. |
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1193 .Sw -noinplace |
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1194 was chosen to be the definitive behavior. |
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1195 .Ci 68a686adeb39223a5e1ad35e4a24890ec053679d |
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1196 |
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1197 |
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1198 .U3 "Forms and Format Strings |
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1199 .P |
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1200 Historically, the tools that had |
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1201 .Sw -form |
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1202 switches to supply a form file had |
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1203 .Sw -format |
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1204 switches as well to supply the contents of a form file as a string |
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1205 on the command line directly. |
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1206 In consequence, the following two lines equaled: |
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1207 .VS |
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1208 scan -form scan.mailx |
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1209 scan -format "`cat .../scan.mailx`" |
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1210 VE |
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1211 The |
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1212 .Sw -format |
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1213 switches were dropped in favor for extending the |
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1214 .Sw -form |
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1215 switches. |
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1216 .Ci f51956be123db66b00138f80464d06f030dbb88d |
95
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1217 If their argument starts with an equal sign (`='), |
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1218 then the rest of the argument is taken as a format string, |
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1219 otherwise the arguments is treated as the name of a format file. |
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1220 Thus, now the following two lines equal: |
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1221 .VS |
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1222 scan -form scan.mailx |
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1223 scan -form "=`cat .../scan.mailx`" |
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1224 VE |
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1225 This rework removed the prefix collision between |
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1226 .Sw -form |
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1227 and |
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1228 .Sw -format . |
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1229 Now, typing |
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1230 .Sw -fo |
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1231 suffices to specify form or format string. |
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1232 .P |
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1233 The different meaning of |
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1234 .Sw -format |
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1235 for |
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1236 .Pn repl |
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1237 and |
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1238 .Pn forw |
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1239 was removed in mmh. |
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1240 .Pn forw |
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1241 was completely switched to MIME-type forwarding, thus removing the |
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1242 .Sw -[no]format . |
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1243 .Ci 6e271608b7b9c23771523f88d23a4d3593010cf1 |
95
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1244 For |
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1245 .Pn repl , |
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1246 the |
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1247 .Sw -[no]format |
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1248 switches were reworked to |
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1249 .Sw -[no]filter |
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1250 switches. |
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1251 .Ci 67411b1f95d6ec987b4c732459e1ba8a8ac192c6 |
95
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1252 The |
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1253 .Sw -format |
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1254 switches of |
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1255 .Pn send |
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1256 and |
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1257 .Pn post , |
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1258 which had a third meaning, |
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1259 were removed likewise. |
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1260 .Ci f3cb7cde0e6f10451b6848678d95860d512224b9 |
95
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1261 Eventually, the ambiguity of the |
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1262 .Sw -format |
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1263 switches was resolved by not anymore having any such switch in mmh. |
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1264 |
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1265 |
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1266 .U3 "MIME Tools |
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1267 .P |
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1268 The MIME tools, which were once part of |
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1269 .Pn mhn |
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1270 [sic!], |
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1271 had several switches that added little practical value to the programs. |
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1272 The |
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1273 .Sw -[no]realsize |
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1274 switches of |
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1275 .Pn mhbuild |
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1276 and |
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1277 .Pn mhlist |
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1278 were removed, doing real size calculations always now |
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1279 .Ci 8d8f1c3abc586c005c904e52c4adbfe694d2201c , |
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1280 as |
95
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1281 ``This provides an accurate count at the expense of a small delay.'' |
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1282 This small delay is not noticable on modern systems. |
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1283 .P |
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1284 The |
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1285 .Sw -[no]check |
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1286 switches were removed together with the support for |
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1287 .Hd Content-MD5 |
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1288 header fields. |
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1289 .[ |
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1290 rfc 1864 |
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1291 .] |
97
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1292 .Ci 31dc797eb5178970d68962ca8939da3fd9a8efda |
95
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1293 (See Sec. XXX) |
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1294 .P |
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1295 The |
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1296 .Sw -[no]ebcdicsafe |
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1297 and |
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1298 .Sw -[no]rfc934mode |
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1299 switches of |
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1300 .Pn mhbuild |
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1301 were removed because they are considered obsolete. |
97
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1302 .Ci 01a3480928da485b4d6109d36d751dfa71799d58 |
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1303 .Ci 3363e2624dce0eb8164cf8b3f1ab385c8ff72e88 |
95
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1304 .P |
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1305 Content caching of external MIME parts, activated with the |
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1306 .Sw -rcache |
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1307 and |
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1308 .Sw -wcache |
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1309 switches was completely removed. |
97
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1310 .Ci d1fefd9f614e4dc3cda16da6c69133c1b2005269 |
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1311 External MIME parts are rare today, having a caching facility |
96 | 1312 for them is appears to be unnecessary. |
95
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1313 .P |
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1314 In pre-MIME times, |
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1315 .Pn mhl |
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1316 had covered many tasks that are part of MIME handling today. |
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1317 Therefore, |
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1318 .Pn mhl |
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1319 could be simplified to a large extend, reducing the number of its |
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1320 switches from 21 to 6. |
97
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1321 .Ci 350ad6d3542a07639213cf2a4fe524e829c1e7b6 |
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1322 .Ci 0e46503be3c855bddaeae3843e1b659279c35d70 |
95
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1323 |
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1324 |
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1325 .U3 "Mail Transfer Switches |
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1326 .P |
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1327 With the removal of the mail transfer facilities, a lot of switches |
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1328 vanished automatically. |
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1329 .Pn inc |
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1330 lost 9 switches, namely |
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1331 .Sw -host , |
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1332 .Sw -port , |
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1333 .Sw -user , |
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1334 .Sw -proxy , |
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1335 .Sw -snoop , |
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1336 .Sw -[no]pack , |
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1337 as well as |
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1338 .Sw -sasl |
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1339 and |
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1340 .Sw -saslmech . |
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1341 .Pn send |
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1342 and |
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1343 .Pn post |
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1344 lost 11 switches each, namely |
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1345 .Sw -server , |
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1346 .Sw -port , |
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1347 .Sw -client , |
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1348 .Sw -user , |
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1349 .Sw -mail , |
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1350 .Sw -saml , |
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1351 .Sw -send , |
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1352 .Sw -soml , |
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1353 .Sw -snoop , |
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1354 as well as |
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1355 .Sw -sasl , |
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1356 .Sw -saslmech , |
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1357 and |
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1358 .Sw -tls . |
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1359 .Pn send |
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1360 had the switches only to pass them further to |
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1361 .Pn post , |
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1362 because the user would invoke |
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1363 .Pn post |
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1364 not directly, but through |
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1365 .Pn send . |
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1366 All these switches, except |
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1367 .Sw -snoop |
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1368 were usually defined as default switches in the user's profile, |
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1369 but hardly given in interactive usage. |
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1370 .P |
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1371 Of course, those switches did not really ``vanish'', but the configuration |
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1372 they did was handed over to external MSAs and MRAs. |
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1373 Instead of setting up the mail transfer in mmh, it is set up in |
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1374 external tools. |
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1375 Yet, this simplifies mmh. |
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1376 Specialized external tools will likely have simple configuration files. |
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1377 Hence, instead of having one complicated central configuration file, |
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1378 the configuration of each domain is separate. |
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1379 Although the user needs to learn to configure each of the tools, |
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1380 each configuration is likely much simpler. |
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1381 |
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1382 |
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1383 .U3 "Maildrop Formats |
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1384 .P |
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1385 With the removal of MMDF maildrop format support, |
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1386 .Pn packf |
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|
1387 and |
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1388 .Pn rcvpack |
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1389 no longer needed their |
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1390 .Sw -mbox |
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1391 and |
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1392 .Sw -mmdf |
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1393 switches. |
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1394 .Sw -mbox |
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1395 is the sole behavior now. |
97
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1396 .Ci 3916ab66ad5d183705ac12357621ea8661afd3c0 |
95
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1397 In the same go, |
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1398 .Pn packf |
97
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1399 and |
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1400 .Pn rcvpack |
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1401 were reworked (see Sec. XXX) and their |
95
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1402 .Sw -file |
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1403 switch became unnecessary. |
97
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1404 .Ci ca1023716d4c2ab890696f3e41fa0d94267a940e |
93
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1405 |
95
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1406 |
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1407 .U3 "Terminal Magic |
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1408 .P |
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1409 Mmh's tools will no longer clear the screen (\c |
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1410 .Pn scan 's |
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1411 and |
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1412 .Pn mhl 's |
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1413 .Sw -[no]clear |
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1414 switches |
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1415 .Ci e57b17343dcb3ff373ef4dd089fbe778f0c7c270 |
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1416 .Ci 943765e7ac5693ae177fd8d2b5a2440e53ce816e ). |
95
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1417 Neither will |
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1418 .Pn mhl |
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1419 ring the bell (\c |
97
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1420 .Sw -[no]bell |
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1421 .Ci e11983f44e59d8de236affa5b0d0d3067c192e24 ) |
95
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1422 nor page the output itself (\c |
97
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1423 .Sw -length |
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1424 .Ci 5b9d883db0318ed2b84bb82dee880d7381f99188 ). |
95
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1425 .P |
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1426 Generally, the pager to use is no longer specified with the |
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1427 .Sw -[no]moreproc |
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1428 command line switches for |
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|
1429 .Pn mhl |
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|
1430 and |
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|
1431 .Pn show /\c |
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|
1432 .Pn mhshow . |
97
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1433 .Ci 39e87a75b5c2d3572ec72e717720b44af291e88a |
95
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1434 .P |
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1435 .Pn prompter |
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|
1436 lost its |
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|
1437 .Sw -erase |
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|
1438 and |
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1439 .Sw -kill |
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1440 switches because today the terminal cares for the line editing keys. |
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1441 |
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1442 |
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1443 .U3 "Header Printing |
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1444 .P |
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1445 .Pn folder 's |
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1446 data output is self-explaining enough that |
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1447 displaying the header line makes few sense. |
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1448 Hence, the |
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1449 .Sw -[no]header |
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1450 switch was removed and headers are never printed. |
97
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1451 .Ci 601cc73d1fa05ce96faa728f036d6c51b91701c7 |
95
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1452 .P |
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1453 In |
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1454 .Pn mhlist , |
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1455 the |
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1456 .Sw -[no]header |
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1457 switches were removed, too. |
97
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1458 .Ci b24f96523aaf60e44e04a3ffb1d22e69a13a602f |
95
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1459 But in this case headers are always printed, |
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1460 because the output is not self-explaining. |
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1461 .P |
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|
1462 .Pn scan |
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|
1463 also had |
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1464 .Sw -[no]header |
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1465 switches. |
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1466 Printing the header had been sensible until the introduction of |
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1467 format strings made it impossible to display the column headings. |
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1468 Only the folder name and the current date remained to be printed. |
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1469 As this information can be perfectly retrieved by |
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1470 .Pn folder |
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|
1471 and |
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1472 .Pn date , |
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1473 consequently, the switches were removed. |
97
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1474 .Ci c477dc5d1d03fa6d9a8ab3dd3508c63cbddc044e |
95
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1475 .P |
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|
1476 By removing all |
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|
1477 .Sw -header |
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|
1478 switches, the collision with |
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|
1479 .Sw -help |
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|
1480 on the first two letters was resolved. |
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|
1481 Currently, |
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|
1482 .Sw -h |
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|
1483 evaluates to |
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|
1484 .Sw -help |
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1485 for all tools of mmh. |
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|
1486 |
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|
1487 |
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1488 .U3 "Suppressing Edits or the WhatNow Shell |
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|
1489 .P |
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|
1490 The |
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1491 .Sw -noedit |
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1492 switch of |
95
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|
1493 .Pn comp , |
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|
1494 .Pn repl , |
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diff
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|
1495 .Pn forw , |
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|
1496 .Pn dist , |
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diff
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|
1497 and |
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|
1498 .Pn whatnow |
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1499 was removed, but it can now be replaced by specifying |
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|
1500 .Sw -editor |
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|
1501 with an empty argument. |
97
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|
1502 .Ci 75fca31a5b9d5c1a99c74ab14c94438d8852fba9 |
95
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|
1503 (Specifying |
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|
1504 .Cl "-editor true |
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1505 is nearly the same, only differing by the previous editor being set.) |
93
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1506 .P |
95
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1507 The more important change is the removal of the |
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1508 .Sw -nowhatnowproc |
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1509 switch. |
97
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|
1510 .Ci ee4f43cf2ef0084ec698e4e87159a94c01940622 |
95
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1511 This switch had introduced an awkward behavior, as explained in nmh's |
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|
1512 man page for |
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|
1513 .Mp comp (1): |
98
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|
1514 .QS |
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1515 The \-editor editor switch indicates the editor to use for |
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1516 the initial edit. Upon exiting from the editor, comp will |
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|
1517 invoke the whatnow program. See whatnow(1) for a discussion |
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|
1518 of available options. The invocation of this program can be |
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1519 inhibited by using the \-nowhatnowproc switch. (In truth of |
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1520 fact, it is the whatnow program which starts the initial |
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1521 edit. Hence, \-nowhatnowproc will prevent any edit from |
95
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1522 occurring.) |
98
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|
1523 .QE |
95
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|
1524 .P |
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1525 Effectively, the |
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1526 .Sw -nowhatnowproc |
100
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1527 switch creates only a draft message. |
95
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1528 As |
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1529 .Cl "-whatnowproc true |
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1530 causes the same behavior, the |
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1531 .Sw -nowhatnowproc |
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1532 switch was removed for being redundant. |
100
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1533 Likely, the |
95
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1534 .Sw -nowhatnowproc |
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|
1535 switch was intended to be used by front-ends. |
95
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1536 |
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|
1537 |
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1538 .U3 "Compatibility Switches |
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1539 .BU |
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1540 The hidden |
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1541 .Sw -[no]total |
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1542 switches of |
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|
1543 .Pn flist . |
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1544 They were simply the inverse of the visible |
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1545 .Sw -[no]fast |
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1546 switches: |
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1547 .Sw -total |
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1548 was |
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1549 .Sw -nofast |
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1550 and |
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1551 .Sw -nototal |
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|
1552 was |
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1553 .Sw -fast . |
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1554 I removed the |
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1555 .Sw -[no]total |
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1556 legacy. |
97
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1557 .Ci ea21fe2c4bd23c639bef251398fae809875732ec |
95
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1558 .BU |
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1559 The |
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1560 .Sw -subject |
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1561 switch of |
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|
1562 .Pn sortm |
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|
1563 existed for compatibility only. |
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1564 It can be fully replaced by |
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|
1565 .Cl "-textfield subject |
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1566 thus it was removed. |
97
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1567 .Ci 00140a3c86e9def69d98ba2ffd4d6e50ef6326ea |
95
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1568 |
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|
1569 |
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1570 .U3 "Various |
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1571 .BU |
96 | 1572 In order to avoid prefix collisions among switch names, the |
95
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1573 .Sw -version |
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|
1574 switch was renamed to |
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|
1575 .Sw -Version |
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1576 (with capital `V'). |
97
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1577 .Ci 32b2354dbaf4bf934936eb5b102a4a3d2fdd209a |
95
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1578 Every program has the |
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|
1579 .Sw -version |
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1580 switch but its first three letters collided with the |
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|
1581 .Sw -verbose |
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1582 switch, present in many programs. |
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1583 The rename solved this problem once for all. |
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1584 Although this rename breaks a basic interface, having the |
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1585 .Sw -V |
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1586 abbreviation to display the version information, isn't all too bad. |
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1587 .BU |
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1588 .Sw -[no]preserve |
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1589 of |
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|
1590 .Pn refile |
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|
1591 was removed because what use was it anyway? |
98
d894191d7a33
style: Changed the block quote approach. New QS and QE.
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|
1592 .QS |
95
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1593 Normally when a message is refiled, for each destination |
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1594 folder it is assigned the number which is one above the current |
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1595 highest message number in that folder. Use of the |
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1596 \-preserv [sic!] switch will override this message renaming, and try |
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1597 to preserve the number of the message. If a conflict for a |
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1598 particular folder occurs when using the \-preserve switch, |
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1599 then refile will use the next available message number which |
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1600 is above the message number you wish to preserve. |
98
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1601 .QE |
95
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|
1602 .BU |
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|
1603 The removal of the |
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1604 .Sw -[no]reverse |
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1605 switches of |
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|
1606 .Pn scan |
97
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|
1607 .Ci 8edc5aaf86f9f77124664f6801bc6c6cdf258173 |
95
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1608 is a bug fix, supported by the comments |
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1609 ``\-[no]reverse under #ifdef BERK (I really HATE this)'' |
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|
1610 by Rose and |
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1611 ``Lists messages in reverse order with the `\-reverse' switch. |
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1612 This should be considered a bug.'' by Romine in the documentation. |
97
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1613 The question remains why neither Rose and Romine had fixed this |
109
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Rework of existing text.
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1614 bug in the eighties when they wrote these comments nor has anyone |
95
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1615 thereafter. |
58
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diff
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|
1616 |
814c33b96d89
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diff
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|
1617 |
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1618 .ig |
58
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|
1619 |
95
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1620 forw: [no]dashstuffing(mhl) |
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1621 |
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1622 mhshow: [no]pause [no]serialonly |
93
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1623 |
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1624 mhmail: resent queued |
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1625 inc: snoop, (pop) |
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1626 |
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1627 mhl: [no]faceproc folder sleep |
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1628 [no]dashstuffing(forw) digest list volume number issue number |
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1629 |
95
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1630 prompter: [no]doteof |
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1631 |
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1632 refile: [no]preserve [no]unlink [no]rmmproc |
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1633 |
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1634 send: [no]forward [no]mime [no]msgid |
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1635 [no]push split [no]unique (sasl) width snoop [no]dashstuffing |
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1636 attach attachformat |
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1637 whatnow: (noedit) attach |
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1638 |
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1639 slocal: [no]suppressdups |
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1640 |
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1641 spost: [no]filter [no]backup width [no]push idanno |
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1642 [no]check(whom) whom(whom) |
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1643 |
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1644 whom: ??? |
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1645 |
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1646 .. |
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1647 |
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1648 |
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1649 .ig |
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1650 |
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1651 .P |
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1652 In the best case, all switches are unambiguous on the first character, |
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1653 or on the three-letter prefix for the `no' variants. |
96 | 1654 Reducing switch prefix collisions, shortens the necessary prefix length |
93
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1655 the user must type. |
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1656 Having less switches helps best. |
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1657 |
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1658 .. |
58
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1659 |
95
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1660 |
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1661 .\" XXX: whatnow prompt commands |
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1662 |
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1663 |
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1664 |
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1665 |
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1666 .\" -------------------------------------------------------------- |
74
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1667 .H1 "Modernizing |
102
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1668 .P |
118
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1669 In the over thirty years of MH's existence, its code base was |
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1670 extended more and more. |
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1671 New features entered the project and became alternatives to the |
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1672 existing behavior. |
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1673 Relicts from several decades have gathered in the code base, |
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1674 but seldom obsolete features were dropped. |
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1675 This section describes the removing of old code |
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1676 and the modernizing of the default setup. |
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1677 It focuses on the functional aspect only; |
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1678 the non-functional aspects of code style are discussed in |
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1679 .\" FIXME REF |
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1680 Sec. XXX. |
58
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1681 |
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1682 |
100
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1683 .H2 "Code Relicts |
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1684 .P |
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1685 My position to drop obsolete functions of mmh, in order to remove old code, |
104 | 1686 is much more revolutional than the nmh community likes to have it. |
1687 Working on an experimental version, I was able to quickly drop | |
1688 functionality I considered ancient. | |
1689 The need for consensus with peers would have slowed this process down. | |
1690 Without the need to justify my decisions, I was able to rush forward. | |
110 | 1691 In December 2011, Paul Vixie motivated the nmh developers to just |
104 | 1692 do the work: |
1693 .[ | |
1694 paul vixie edginess nmh-workers | |
1695 .] | |
1696 .QS | |
1697 let's stop walking on egg shells with this code base. there's no need to | |
1698 discuss whether to keep using vfork, just note in [sic!] passing, [...] | |
1699 we don't need a separate branch for removing vmh | |
1700 or ridding ourselves of #ifdef's or removing posix replacement functions | |
1701 or depending on pure ansi/posix "libc". | |
1702 .QP | |
1703 these things should each be a day or two of work and the "main branch" | |
1704 should just be modern. [...] | |
1705 let's push forward, aggressively. | |
1706 .QE | |
1707 .LP | |
1708 I did so already in the months before. | |
1709 I pushed forward. | |
1710 I simply dropped the cruft. | |
1711 .P | |
1712 The decision to drop a feature was based on literature research and | |
1713 careful thinking, but whether having had contact to this particular | |
1714 feature within my own computer life served as a rule of thumb. | |
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1715 Always, I explained my reasons in the commit messages |
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1716 in the version control system. |
104 | 1717 Hence, others can comprehend my view and argue for undoing the change |
1718 if I have missed an important aspect. | |
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1719 I was quick in dropping parts. |
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1720 I rather re-included falsely dropped parts than going a slower pace. |
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1721 Mmh is experimental work; it required tough decisions. |
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1722 |
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1723 |
104 | 1724 .U3 "Forking |
0
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1725 .P |
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1726 Being a tool chest, MH creates many processes. |
104 | 1727 In earlier times |
1728 .Fu fork() | |
1729 had been an expensive system call, because the process's image needed | |
1730 to be duplicated completely at once. | |
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1731 This was especially painful in the common case when the image gets |
104 | 1732 replaced by a call to |
1733 .Fu exec() | |
1734 right after having forked the child process. | |
1735 The | |
1736 .Fu vfork() | |
1737 system call was invented to speed up this particular case. | |
1738 It completely omits the duplication of the image. | |
1739 On old systems this resulted in significant speed ups. | |
1740 Therefore MH used | |
1741 .Fu vfork() | |
1742 whenever possible. | |
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1743 .P |
104 | 1744 Modern memory management units support copy-on-write semantics, which make |
1745 .Fu fork() | |
1746 almost as fast as | |
1747 .Fu vfork() . | |
1748 The man page of | |
1749 .Mp vfork (2) | |
1750 in FreeBSD 8.0 states: | |
1751 .QS | |
1752 This system call will be eliminated when proper system sharing mechanisms | |
1753 are implemented. Users should not depend on the memory sharing semantics | |
1754 of vfork() as it will, in that case, be made synonymous to fork(2). | |
1755 .QE | |
1756 .LP | |
1757 Vixie supports the removal with the note that ``the last | |
1758 system on which fork was so slow that an mh user would notice it, was | |
1759 Eunice. that was 1987''. | |
1760 .[ | |
1761 nmh-workers vixie edginess | |
1762 .] | |
1763 I replaced all calls to | |
1764 .Fu vfork() | |
1765 with calls to | |
1766 .Fu fork() . | |
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1767 .Ci 40821f5c1316e9205a08375e7075909cc9968e7d |
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1768 .P |
104 | 1769 Related to the costs of |
1770 .Fu fork() | |
1771 is the probability of its success. | |
109
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1772 In the eighties, on heavy loaded systems, calls to |
104 | 1773 .Fu fork() |
1774 were prone to failure. | |
1775 Hence, many of the | |
1776 .Fu fork() | |
1777 calls in the code were wrapped into loops to retry the | |
1778 .Fu fork() | |
109
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1779 several times, to increase the changes to succeed, eventually. |
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1780 On modern systems, a failing |
104 | 1781 .Fu fork() |
109
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1782 call is unusual. |
104 | 1783 Hence, in the rare case when |
1784 .Fu fork() | |
1785 fails, mmh programs simply abort. | |
109
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1786 .Ci 5fbf37ee68e018998ada61eeab73e035b26834b6 |
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1787 |
104 | 1788 |
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1789 .U3 "Header Fields |
104 | 1790 .BU |
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1791 The |
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1792 .Hd Encrypted |
104 | 1793 header field was introduced by RFC\|822, |
109
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1794 but already marked as legacy in RFC\|2822. |
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1795 Today, OpenPGP provides the basis for standardized exchange of encrypted |
104 | 1796 messages [RFC\|4880, RFC\|3156]. |
109
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1797 Hence, the support for |
104 | 1798 .Hd Encrypted |
1799 header fields is removed in mmh. | |
109
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1800 .Ci 064527f7b57ab050e5af13e15ad99aeeab125857 |
104 | 1801 .BU |
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1802 Native support for |
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1803 .Hd Face |
104 | 1804 header fields has been removed, as well. |
109
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1805 .Ci 8e5be81f784682822f5e868c1bf3c8624682bd23 |
104 | 1806 This feature is similar to the |
84
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1807 .Hd X-Face |
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1808 header field in its intent, |
21
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1809 but takes a different approach to store the image. |
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1810 Instead of encoding the image data directly into the header field, |
109
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1811 it contains the hostname and UDP port where the image |
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1812 date can be retrieved. |
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1813 There exists even a third Face system, |
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1814 which is the successor of |
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1815 .Hd X-Face , |
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1816 although it re-uses the |
84
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1817 .Hd Face |
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1818 header field. |
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1819 It was invented in 2005 and supports colored PNG images. |
104 | 1820 None of the Face systems described here is popular today. |
1821 Hence, mmh has no direct support for them. | |
1822 .BU | |
1823 The | |
1824 .Hd Content-MD5 | |
1825 header field was introduced by RFC\|1864. | |
1826 It provides detection of data corruption during the transfer. | |
1827 But it can not ensure verbatim end-to-end delivery of the contents | |
1828 [RFC\|1864]. | |
1829 The proper approach to verify content integrity in an | |
1830 end-to-end relationship is the use of digital cryptography. | |
1831 .\" XXX (RFCs FIXME). | |
1832 On the other hand, transfer protocols should detect corruption during | |
109
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1833 the transmission. |
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1834 The TCP includes a checksum field therefore. |
104 | 1835 These two approaches in combinations render the |
1836 .Hd Content-MD5 | |
1837 header field superfluous. | |
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1838 Not a single one out of 4\|200 messages from two decades |
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1839 in an nmh-workers mailing list archive contains a |
84
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1840 .Hd Content-MD5 |
104 | 1841 header field. |
1842 Neither did any of the 60\|000 messages in my personal mail storage. | |
1843 Removing the support for this header field, | |
1844 removed the last place where MD5 computation was needed. | |
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1845 .Ci 31dc797eb5178970d68962ca8939da3fd9a8efda |
104 | 1846 Hence, the MD5 code could be removed as well. |
1847 Over 500 lines of code vanished by this one change. | |
1848 | |
1849 | |
1850 .U3 "MMDF maildrop support | |
1851 .P | |
1852 This type of format is conceptionally similar to the mbox format, | |
1853 but uses a different message delimiter (`\fL^A^A^A^A\fP' instead of | |
1854 `\fLFrom\0\fP'). | |
1855 Mbox is the de-facto standard maildrop format on Unix, | |
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1856 whereas the MMDF maildrop format became forgotten. |
104 | 1857 I did drop MMDF maildrop format support. |
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1858 Mbox is the only packed mailbox format supported in mmh. |
104 | 1859 .P |
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1860 The simplifications within the code were moderate. |
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1861 Mainly, the reading and writing of MMDF mailbox files was removed. |
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1862 But also, switches of |
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1863 .Pn packf |
104 | 1864 and |
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1865 .Pn rcvpack |
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1866 could be removed. |
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1867 .Ci 3916ab66ad5d183705ac12357621ea8661afd3c0 |
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|
1868 In the message parsing function |
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1869 .Fn sbr/m_getfld.c , |
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1870 knowledge of MMDF packed mail boxes was removed. |
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1871 .Ci 684ec30d81e1223a282764452f4902ed4ad1c754 |
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1872 Further code structure simplifications may be possible there, |
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|
1873 because only one single packed mailbox format is left to be supported. |
104 | 1874 I have not worked on them yet because |
1875 .Fu m_getfld() | |
1876 is heavily optimized and thus dangerous to touch. | |
1877 The risk of damaging the intricate workings of the optimized code is | |
1878 too high. | |
1879 .\" XXX: move somewhere else | |
1880 This problem is know to the developers of nmh, too. | |
109
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1881 They also avoid touching this minefield. |
104 | 1882 |
12
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|
1883 |
101
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1884 .U3 "Prompter's Control Keys |
20
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Some new text (show/mhshow; prompter).
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diff
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|
1885 .P |
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Some new text (show/mhshow; prompter).
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|
1886 The program |
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Some new text (show/mhshow; prompter).
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|
1887 .Pn prompter |
104 | 1888 queries the user to fill in a message form. |
1889 When used by | |
20
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Some new text (show/mhshow; prompter).
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19
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|
1890 .Pn comp |
104 | 1891 as |
1892 .Cl "comp -editor prompter" , | |
20
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Some new text (show/mhshow; prompter).
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parents:
19
diff
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|
1893 the resulting behavior is similar to |
7a100c80fa91
Some new text (show/mhshow; prompter).
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19
diff
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|
1894 .Pn mailx . |
51 | 1895 Apparently, |
20
7a100c80fa91
Some new text (show/mhshow; prompter).
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|
1896 .Pn prompter |
104 | 1897 hadn't been touched lately. |
1898 Otherwise it's hardly explainable why it | |
20
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Some new text (show/mhshow; prompter).
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parents:
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|
1899 still offered the switches |
84
c35ec2b7de5d
style: New macros .Ar (argument) and .Hd (header field)
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|
1900 .Sw -erase |
c35ec2b7de5d
style: New macros .Ar (argument) and .Hd (header field)
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|
1901 .Ar chr |
20
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Some new text (show/mhshow; prompter).
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parents:
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|
1902 and |
84
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style: New macros .Ar (argument) and .Hd (header field)
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parents:
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|
1903 .Sw -kill |
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style: New macros .Ar (argument) and .Hd (header field)
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|
1904 .Ar chr |
20
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Some new text (show/mhshow; prompter).
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parents:
19
diff
changeset
|
1905 to name the characters for command line editing. |
21
bb8a8be49024
Wrote about Face support and vfork().
markus schnalke <meillo@marmaro.de>
parents:
20
diff
changeset
|
1906 The times when this had been necessary are long time gone. |
20
7a100c80fa91
Some new text (show/mhshow; prompter).
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parents:
19
diff
changeset
|
1907 Today these things work out-of-the-box, and if not, are configured |
7a100c80fa91
Some new text (show/mhshow; prompter).
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parents:
19
diff
changeset
|
1908 with the standard tool |
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Some new text (show/mhshow; prompter).
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parents:
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|
1909 .Pn stty . |
104 | 1910 The switches are removed now |
1911 .Ci 0bd9750710cdbab80cfb4036dd87af20afe1552f . | |
20
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Some new text (show/mhshow; prompter).
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|
1912 |
104 | 1913 |
109
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|
1914 .U3 "Hardcopy Terminal Support |
21
bb8a8be49024
Wrote about Face support and vfork().
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20
diff
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|
1915 .P |
109
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1916 More of a funny anecdote is a check for being connected to a |
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1917 hardcopy terminal. |
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markus schnalke <meillo@marmaro.de>
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|
1918 It remained in the code until Spring 2012, when I finally removed it |
104 | 1919 .Ci b7764c4a6b71d37918a97594d866258f154017ca . |
109
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1920 I would be truly happy to see such a terminal in action today, |
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1921 maybe even being able to work on it. |
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|
1922 But I fear my chances are null. |
21
bb8a8be49024
Wrote about Face support and vfork().
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parents:
20
diff
changeset
|
1923 .P |
109
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Rework of existing text.
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1924 The check only prevented a pager to be placed between the printing |
104 | 1925 program (\c |
1926 .Pn mhl ) | |
1927 and the terminal. | |
109
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Rework of existing text.
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diff
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|
1928 In nmh, this could have been ensured statically with the |
104 | 1929 .Sw -nomoreproc |
109
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diff
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|
1930 at the command line, too. |
121
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
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diff
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|
1931 In mmh, setting the profile entry |
104 | 1932 .Pe Pager |
1933 or the environment variable | |
1934 .Ev PAGER | |
1935 to | |
109
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Rework of existing text.
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108
diff
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|
1936 .Pn cat |
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Rework of existing text.
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parents:
108
diff
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|
1937 does the job. |
104 | 1938 |
1939 | |
21
bb8a8be49024
Wrote about Face support and vfork().
markus schnalke <meillo@marmaro.de>
parents:
20
diff
changeset
|
1940 |
12
7ca384d68edc
Wrote some text for removal of old code.
markus schnalke <meillo@marmaro.de>
parents:
0
diff
changeset
|
1941 |
58
814c33b96d89
Restructured the content in ch03.
markus schnalke <meillo@marmaro.de>
parents:
51
diff
changeset
|
1942 .H2 "Attachments |
22
99409e4546d2
Wrote about the removal of tools.
markus schnalke <meillo@marmaro.de>
parents:
21
diff
changeset
|
1943 .P |
101
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
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diff
changeset
|
1944 The mind model of email attachments is unrelated to MIME. |
e8e6adb14beb
Wrote about attachments.
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100
diff
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|
1945 Although the MIME RFCs (2045 through 2049) define the technical |
109
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Rework of existing text.
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|
1946 requirements for having attachments, they do not mention the word |
101
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1947 ``attachment''. |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1948 Instead of attachments, MIME talks about ``multi-part message bodies'' |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1949 [RFC\|2045], a more general concept. |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1950 Multi-part messages are messages |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1951 ``in which one or more different |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1952 sets of data are combined in a single body'' |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1953 [RFC\|2046]. |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1954 MIME keeps its descriptions generic; |
e8e6adb14beb
Wrote about attachments.
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parents:
100
diff
changeset
|
1955 it does not imply specific usage models. |
109
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Rework of existing text.
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parents:
108
diff
changeset
|
1956 One usage model became prevalent: attachments. |
101
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1957 The idea is having a main text document with files of arbitrary kind |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1958 attached to it. |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1959 In MIME terms, this is a multi-part message having a text part first |
110 | 1960 and parts of arbitrary type following. |
101
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1961 .P |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1962 MH's MIME support is a direct implementation of the RFCs. |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1963 The perception of the topic described in the RFCs is clearly visible |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1964 in MH's implementation. |
109
2b094b8fb422
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
108
diff
changeset
|
1965 In result, MH had all the MIME features but no idea of attachments. |
2b094b8fb422
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
108
diff
changeset
|
1966 But users don't need all the MIME features, |
2b094b8fb422
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
108
diff
changeset
|
1967 they want convenient attachment handling. |
2b094b8fb422
Rework of existing text.
markus schnalke <meillo@marmaro.de>
parents:
108
diff
changeset
|
1968 |
102
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
1969 |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
1970 .U3 "Composing MIME Messages |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
1971 .P |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
1972 In order to improve the situation on the message composing side, |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
1973 Jon Steinhart had added an attachment system to nmh in 2002. |
101
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1974 .Ci 7480dbc14bc90f2d872d434205c0784704213252 |
102
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
1975 In the file |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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parents:
101
diff
changeset
|
1976 .Fn docs/README-ATTACHMENTS , |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
1977 he described his motivation to do so as such: |
101
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1978 .QS |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1979 Although nmh contains the necessary functionality for MIME message handing, |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1980 the interface to this functionality is pretty obtuse. |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1981 There's no way that I'm ever going to convince my partner to write |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1982 .Pn mhbuild |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1983 composition files! |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1984 .QE |
102
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
1985 .LP |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
1986 With this change, the mind model of attachments entered nmh. |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
1987 In the same document: |
101
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1988 .QS |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1989 These changes simplify the task of managing attachments on draft files. |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1990 They allow attachments to be added, listed, and deleted. |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1991 MIME messages are automatically created when drafts with attachments |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1992 are sent. |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1993 .QE |
102
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
1994 .LP |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
1995 Unfortunately, the attachment system, |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
1996 like any new facilities in nmh, |
110 | 1997 was inactive by default. |
101
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1998 .P |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
1999 During my work in Argentina, I tried to improve the attachment system. |
102
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2000 But, because of great opposition in the nmh community, |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2001 my patch died as a proposal on the mailing list, after long discussions. |
101
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
2002 .[ |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
2003 nmh-workers attachment proposal |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
2004 .] |
110 | 2005 In January 2012, I extended the patch and applied it to mmh. |
101
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
2006 .Ci 8ff284ff9167eff8f5349481529332d59ed913b1 |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
2007 In mmh, the attachment system is active by default. |
102
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2008 Instead of command line switches, the |
101
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
2009 .Pe Attachment-Header |
102
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2010 profile entry is used to specify |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2011 the name of the attachment header field. |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2012 It is pre-defined to |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2013 .Hd Attach . |
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2014 .P |
101
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2015 To add an attachment to a draft, simply add an attachment header: |
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Wrote about attachments.
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100
diff
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|
2016 .VS |
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
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diff
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|
2017 To: bob |
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
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diff
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|
2018 Subject: The file you wanted |
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Wrote about attachments.
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100
diff
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|
2019 Attach: /path/to/the/file-bob-wanted |
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diff
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|
2020 -------- |
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
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diff
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|
2021 Here it is. |
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
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100
diff
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|
2022 VE |
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markus schnalke <meillo@marmaro.de>
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diff
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|
2023 The header field can be added to the draft manually in the editor, |
102
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|
2024 or by using the `attach' command at the WhatNow prompt, or |
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101
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|
2025 non-interactively with |
101
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diff
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|
2026 .Pn anno : |
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
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diff
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|
2027 .VS |
102
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More text about attachments mainly, plus some rearrangements.
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|
2028 anno -append -nodate -component Attach -text /path/to/attachment |
101
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100
diff
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|
2029 VE |
102
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
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diff
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|
2030 Drafts with attachment headers are converted to MIME automatically by |
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2031 .Pn send . |
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2032 The conversion to MIME is invisible to the user. |
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diff
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|
2033 The draft stored in the draft folder is always in source form, with |
101
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markus schnalke <meillo@marmaro.de>
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diff
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|
2034 attachment headers. |
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
changeset
|
2035 If the MIMEification fails, for instance because the file to attach |
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diff
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|
2036 is not accessible, the original draft is not changed. |
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|
2037 .P |
102
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diff
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|
2038 The attachment system handles the forwarding of messages, too. |
101
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diff
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|
2039 If the attachment header value starts with a plus character (`+'), |
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markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2040 like in |
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markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2041 .Cl "Attach: +bob 30 42" , |
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diff
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2042 The given messages in the specified folder will be attached. |
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
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diff
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|
2043 This allowed to simplify |
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2044 .Pn forw . |
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2045 .Ci f41f04cf4ceca7355232cf7413e59afafccc9550 |
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
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diff
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|
2046 .P |
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markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2047 Closely related to attachments is non-ASCII text content, |
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Wrote about attachments.
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diff
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|
2048 because it requires MIME too. |
102
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diff
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|
2049 In nmh, the user needed to call `mime' at the WhatNow prompt |
101
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diff
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|
2050 to have the draft converted to MIME. |
102
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|
2051 This was necessary whenever the draft contained non-ASCII characters. |
101
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diff
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|
2052 If the user did not call `mime', a broken message would be sent. |
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2053 Therefore, the |
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2054 .Pe automimeproc |
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markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2055 profile entry could be specified to have the `mime' command invoked |
102
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diff
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|
2056 automatically each time. |
101
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parents:
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diff
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|
2057 Unfortunately, this approach conflicted with with attachment system |
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2058 because the draft would already be in MIME format at the time |
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2059 when the attachment system wanted to MIMEify it. |
102
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More text about attachments mainly, plus some rearrangements.
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parents:
101
diff
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|
2060 To use nmh's attachment system, `mime' must not be called at the |
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parents:
101
diff
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|
2061 WhatNow prompt and |
101
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100
diff
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|
2062 .Pe automimeproc |
102
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
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101
diff
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|
2063 must not be set in the profile. |
101
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parents:
100
diff
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|
2064 But then the case of non-ASCII text without attachment headers was |
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
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100
diff
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|
2065 not caught. |
102
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2066 All in all, the solution was complex and irritating. |
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More text about attachments mainly, plus some rearrangements.
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2067 My patch from December 2010 would have simplified the situation. |
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parents:
101
diff
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|
2068 .P |
101
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markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2069 Mmh's current solution is even more elaborate. |
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2070 Any necessary MIMEification is done automatically. |
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markus schnalke <meillo@marmaro.de>
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100
diff
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|
2071 There is no `mime' command at the WhatNow prompt anymore. |
102
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parents:
101
diff
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|
2072 The draft will be converted automatically to MIME when either an |
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
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|
2073 attachment header or non-ASCII text is present. |
101
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100
diff
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|
2074 Further more, the special meaning of the hash character (`#') |
102
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markus schnalke <meillo@marmaro.de>
parents:
101
diff
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|
2075 at line beginnings in the draft message is removed. |
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
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|
2076 Users need not at all deal with the whole topic. |
101
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markus schnalke <meillo@marmaro.de>
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100
diff
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|
2077 .P |
102
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parents:
101
diff
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|
2078 Although the new approach does not anymore support arbitrary MIME |
a782488c85f5
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markus schnalke <meillo@marmaro.de>
parents:
101
diff
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|
2079 compositions directly, the full power of |
101
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markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2080 .Pn mhbuild |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2081 can still be accessed. |
102
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
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|
2082 Given no attachment headers are included, the user can create |
101
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markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2083 .Pn mhbuild |
102
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
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|
2084 composition drafts like in nmh. |
101
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2085 Then, at the WhatNow prompt, he needs to invoke |
e8e6adb14beb
Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2086 .Cl "edit mhbuild |
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markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2087 to convert it to MIME. |
110 | 2088 Because the resulting draft does neither contain non-ASCII characters |
102
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
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|
2089 nor has it attachment headers, the attachment system will not touch it. |
101
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Wrote about attachments.
markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2090 .P |
121
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
2091 The approach taken in mmh is tailored towards todays most common case: |
101
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parents:
100
diff
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|
2092 a text part with possibly attachments. |
102
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markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2093 This case is simplified a lot for users. |
101
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markus schnalke <meillo@marmaro.de>
parents:
100
diff
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|
2094 |
112
4e6a9ae1b53c
Added a bit of text on modern defaults; plus added code refs.
markus schnalke <meillo@marmaro.de>
parents:
110
diff
changeset
|
2095 |
102
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
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|
2096 .U3 "MIME Type Guessing |
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
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101
diff
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|
2097 .P |
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
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101
diff
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|
2098 The use of |
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101
diff
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|
2099 .Pn mhbuild |
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markus schnalke <meillo@marmaro.de>
parents:
101
diff
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|
2100 composition drafts had one notable advantage over attachment headers |
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More text about attachments mainly, plus some rearrangements.
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101
diff
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|
2101 from the programmer's point of view: The user provides the appropriate |
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
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|
2102 MIME types for files to include. |
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
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101
diff
changeset
|
2103 The attachment system needs to find out the correct MIME type itself. |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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101
diff
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|
2104 This is a difficult task, yet it spares the user irritating work. |
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2105 Determining the correct MIME type of content is partly mechanical, |
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More text about attachments mainly, plus some rearrangements.
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101
diff
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|
2106 partly intelligent work. |
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
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101
diff
changeset
|
2107 Forcing the user to find out the correct MIME type, |
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
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|
2108 forces him to do partly mechanical work. |
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More text about attachments mainly, plus some rearrangements.
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101
diff
changeset
|
2109 Letting the computer do the work, can lead to bad choices for difficult |
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
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|
2110 content. |
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2111 For mmh, the latter option was chosen. |
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|
2112 .P |
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|
2113 Determining the MIME type by the suffix of the file name is a dumb |
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More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
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101
diff
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|
2114 approach, yet it is simple to implement and provides good results |
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diff
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2115 for the common cases. |
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|
2116 Mmh implements this approach in the |
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More text about attachments mainly, plus some rearrangements.
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101
diff
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|
2117 .Pn print-mimetype |
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101
diff
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|
2118 script. |
112
4e6a9ae1b53c
Added a bit of text on modern defaults; plus added code refs.
markus schnalke <meillo@marmaro.de>
parents:
110
diff
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|
2119 .Ci 4b5944268ea0da7bb30598a27857304758ea9b44 |
102
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|
2120 Using it is the default choice. |
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|
2121 .P |
112
4e6a9ae1b53c
Added a bit of text on modern defaults; plus added code refs.
markus schnalke <meillo@marmaro.de>
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110
diff
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|
2122 A far better, though less portable, approach is the use of |
102
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parents:
101
diff
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|
2123 .Pn file . |
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101
diff
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|
2124 This standard tool tries to determine the type of files. |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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parents:
101
diff
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|
2125 Unfortunately, its capabilities and accuracy varies from system to system. |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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parents:
101
diff
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|
2126 Additionally, its output was only intended for human beings, |
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101
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|
2127 but not to be used by programs. |
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diff
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2128 It varies much. |
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parents:
101
diff
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|
2129 Nevertheless, modern versions of GNU |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
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|
2130 .Pn file , |
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101
diff
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|
2131 which is prevalent on the popular GNU/Linux systems, |
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101
diff
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|
2132 provides MIME type output in machine-readable form. |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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101
diff
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|
2133 Although this solution is highly system-dependent, |
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diff
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|
2134 it solves the difficult problem well. |
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101
diff
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|
2135 On systems where GNU |
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101
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|
2136 .Pn file , |
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101
diff
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|
2137 version 5.04 or higher, is available it should be used. |
a782488c85f5
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101
diff
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|
2138 One needs to specify the following profile entry to do so: |
112
4e6a9ae1b53c
Added a bit of text on modern defaults; plus added code refs.
markus schnalke <meillo@marmaro.de>
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110
diff
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|
2139 .Ci 3baec236a39c5c89a9bda8dbd988d643a21decc6 |
102
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More text about attachments mainly, plus some rearrangements.
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diff
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|
2140 .VS |
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More text about attachments mainly, plus some rearrangements.
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101
diff
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|
2141 Mime-Type-Query: file -b --mime |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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parents:
101
diff
changeset
|
2142 VE |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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parents:
101
diff
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|
2143 .LP |
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More text about attachments mainly, plus some rearrangements.
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101
diff
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|
2144 Other versions of |
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More text about attachments mainly, plus some rearrangements.
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101
diff
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|
2145 .Pn file |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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parents:
101
diff
changeset
|
2146 might possibly be usable with wrapper scripts to reformat the output. |
a782488c85f5
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parents:
101
diff
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|
2147 The diversity among |
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parents:
101
diff
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|
2148 .Pn file |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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parents:
101
diff
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|
2149 implementations is great; one needs to check the local variant. |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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parents:
101
diff
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|
2150 .P |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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parents:
101
diff
changeset
|
2151 If no MIME type can be determined, text content gets sent as |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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parents:
101
diff
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|
2152 `text/plain' and anything else under the generic fall-back type |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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101
diff
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|
2153 `application/octet-stream'. |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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101
diff
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|
2154 It is not possible in mmh to override the automatic MIME type guessing |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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parents:
101
diff
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|
2155 for a specific file. |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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101
diff
changeset
|
2156 To do so, the user would need to know in advance for which file |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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101
diff
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|
2157 the automatic guessing does fail, or the system would require interaction. |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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101
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|
2158 I consider both cases impractical. |
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101
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|
2159 The existing solution should be sufficient. |
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More text about attachments mainly, plus some rearrangements.
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101
diff
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|
2160 If not, the user may always fall back to |
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More text about attachments mainly, plus some rearrangements.
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parents:
101
diff
changeset
|
2161 .Pn mhbuild |
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More text about attachments mainly, plus some rearrangements.
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101
diff
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|
2162 composition drafts and ignore the attachment system. |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2163 |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2164 |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2165 .U3 "Storing Attachments |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
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parents:
101
diff
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|
2166 .P |
108
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2167 Extracting MIME parts of a message and storing them to disk is done by |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
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|
2168 .Pn mhstore . |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2169 The program has two operation modes, |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2170 .Sw -auto |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2171 and |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
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|
2172 .Sw -noauto . |
dd5620bf8659
Wrote about storing attachments.
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parents:
107
diff
changeset
|
2173 With the former one, each part is stored under the filename given in the |
dd5620bf8659
Wrote about storing attachments.
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parents:
107
diff
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|
2174 MIME part's meta information, if available. |
dd5620bf8659
Wrote about storing attachments.
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parents:
107
diff
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|
2175 This naming information is usually available for modern attachments. |
dd5620bf8659
Wrote about storing attachments.
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parents:
107
diff
changeset
|
2176 If no filename is available, this MIME part is stored as if |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2177 .Sw -noauto |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2178 would have been specified. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2179 In the |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2180 .Sw -noauto |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2181 mode, the parts are processed according to rules, defined by |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2182 .Pe mhstore-store-* |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2183 profile entries. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2184 These rules define generic filename templates for storing |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2185 or commands to post-process the contents in arbitrary ways. |
dd5620bf8659
Wrote about storing attachments.
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parents:
107
diff
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|
2186 If no matching rule is available the part is stored under a generic |
dd5620bf8659
Wrote about storing attachments.
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parents:
107
diff
changeset
|
2187 filename, built from message number, MIME part number, and MIME type. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2188 .P |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2189 The |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2190 .Sw -noauto |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2191 mode had been the default in nmh because it was considered safe, |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2192 in contrast to the |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2193 .Sw -auto |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2194 mode. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2195 In mmh, |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2196 .Sw -auto |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2197 is not dangerous anymore. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2198 Two changes were necessary: |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2199 .BU |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2200 Any directory path is removed from the proposed filename. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2201 Thus, the files are always stored in the expected directory. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2202 .Ci 41b6eadbcecf63c9a66aa5e582011987494abefb |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2203 .BU |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2204 Tar files are not extracted automatically any more. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2205 Thus, the rest of the file system will not be touched. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2206 .Ci 94c80042eae3383c812d9552089953f9846b1bb6 |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2207 .LP |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2208 Now, the outcome of mmh's |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2209 .Cl "mhstore -auto |
110 | 2210 can be foreseen from the output of |
108
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2211 .Cl "mhlist -verbose" . |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2212 .P |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2213 The |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2214 .Sw -noauto |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2215 mode is seen to be more powerful but less convenient. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2216 On the other hand, |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2217 .Sw -auto |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2218 is safe now and |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2219 storing attachments under their original name is intuitive. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2220 Hence, |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2221 .Sw -auto |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2222 serves better as the default option. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2223 .Ci 3410b680416c49a7617491af38bc1929855a331d |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2224 .P |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2225 Files are stored into the directory given by the |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2226 .Pe Nmh-Storage |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2227 profile entry, if set, or |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2228 into the current working directory, otherwise. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2229 Storing to different directories is only possible with |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2230 .Pe mhstore-store-* |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2231 profile entries. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2232 .P |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2233 Still, in both modes, existing files get overwritten silently. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2234 This can be considered a bug. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2235 Yet, each other behavior has its draw-backs, too. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2236 Refusing to replace files requires adding a |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2237 .Sw -force |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2238 option. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2239 Users will likely need to invoke |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2240 .Pn mhstore |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2241 a second time with |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2242 .Sw -force |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2243 then. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2244 Eventually, only the user can decide in the concrete case. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2245 This requires interaction, which I like to avoid if possible. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2246 Appending a unique suffix to the filename is another bad option. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2247 For now, the behavior remains as it is. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2248 .P |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2249 In mmh, only MIME parts of type message are special in |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2250 .Pn mhstore 's |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2251 .Sw -auto |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2252 mode. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2253 Instead of storing message/rfc822 parts as files to disk, |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2254 they are stored as messages into the current mail folder. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2255 The same applies to message/partial, only, the parts are reassembled |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2256 automatically before. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2257 Parts of type message/external-body are not automatically retrieved |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2258 anymore. Instead, Information on how to retrieve them is output. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2259 Not supporting this rare case saved nearly one thousand lines of code. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2260 .Ci 55e1d8c654ee0f7c45b9361ce34617983b454c32 |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2261 .\" XXX mention somewhere else too: (The profile entry `nmh-access-ftp' |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2262 .\" and sbr/ruserpass.c for reading ~/.netrc are gone now.) |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2263 Not special anymore is `application/octet-stream; type=tar'. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2264 Automatically extracting such MIME parts had been the dangerous part |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2265 of the |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2266 .Sw -auto |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2267 mode. |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2268 .Ci 94c80042eae3383c812d9552089953f9846b1bb6 |
dd5620bf8659
Wrote about storing attachments.
markus schnalke <meillo@marmaro.de>
parents:
107
diff
changeset
|
2269 |
102
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2270 |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2271 |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2272 .U3 "Showing MIME Messages |
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2273 .P |
114
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2274 The program |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2275 .Pn mhshow |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2276 had been written to display MIME messages. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2277 It implemented the conceptional view of the MIME RFCs. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2278 Nmh's |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2279 .Pn mhshow |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2280 handled each MIME part independently, presenting them separately |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2281 to the user. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2282 This does not match today's understanding of email attachments, |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2283 where displaying a message is seen to be a single, integrated operation. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2284 Today, email messages are expected to consist of a main text part |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2285 plus possibly attachments. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2286 They are not any more seen to be arbitrary MIME hierarchies with |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2287 information on how to display the individual parts. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2288 I adjusted |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2289 .Pn mhshow 's |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2290 behavior to the modern view on the topic. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2291 .P |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2292 Note that this section completely ignores the original |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2293 .Pn show |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2294 program, because it was not capable to display MIME messages |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2295 and is no longer part of mmh. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2296 Although |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2297 .Pn mhshow |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2298 was renamed to |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2299 .Pn show |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2300 in mmh, this section uses the name |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2301 .Pn mhshow , |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2302 in order to avoid confusion. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2303 .P |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2304 In mmh, the basic idea is that |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2305 .Pn mhshow |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2306 should display a message in one single pager session. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2307 Therefore, |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2308 .Pn mhshow |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2309 invokes a pager session for all its output, |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2310 whenever it prints to a terminal. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2311 .Ci a4197ea6ffc5c1550e8b52d5a654bcaaaee04a4e |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2312 In consequence, |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2313 .Pn mhl |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2314 does no more invoke a pager. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2315 .Ci 0e46503be3c855bddaeae3843e1b659279c35d70 |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2316 With |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2317 .Pn mhshow |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2318 replacing the original |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2319 .Pn show , |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2320 output from |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2321 .Pn mhl |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2322 does not go to the terminal directly, but through |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2323 .Pn mhshow . |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2324 Hence, |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2325 .Pn mhl |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2326 does not need to invoke a pager. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2327 The one and only job of |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2328 .Pn mhl |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2329 is to format messages or parts of them. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2330 The only place in mmh, where a pager is invoked is |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2331 .Pn mhshow . |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2332 .P |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2333 .Pe mhshow-show-* |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2334 profile entries can be used to display MIME parts in a specific way. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2335 For instance, PDF and Postscript files could be converted to plain text |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2336 to display them in the terminal. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2337 In mmh, the displaying of MIME parts will always be done serially. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2338 The request to display the MIME type `multipart/parallel' in parallel |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2339 is ignored. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2340 It is simply treated as `multipart/mixed'. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2341 .Ci d0581ba306a7299113a346f9b4c46ce97bc4cef6 |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2342 This could already be requested with the, now removed, |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2343 .Sw -serialonly |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2344 switch of |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2345 .Pn mhshow . |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2346 As MIME parts are always processed exclusively , i.e. serially, |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2347 the `%e' escape in |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2348 .Pe mhshow-show-* |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2349 profile entries became useless and was thus removed. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2350 .Ci a20d405db09b7ccca74d3e8c57550883da49e1ae |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2351 .P |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2352 In the intended setup, only text content would be displayed. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2353 Non-text content would be converted to text by appropriate |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2354 .Pe mhshow-show-* |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2355 profile entries before, if possible and wanted. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2356 All output would be displayed in a single pager session. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2357 Other kinds of attachments are ignored. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2358 With |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2359 .Pe mhshow-show-* |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2360 profile entries for them, they can be displayed serially along |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2361 the message. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2362 For parallel display, the attachments need to be stored to disk first. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2363 .P |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2364 To display text content in foreign charsets, they need to be converted |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2365 to the native charset. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2366 Therefore, |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2367 .Pe mhshow-charset-* |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2368 profile entries used to be needed. |
121
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
2369 In mmh, the conversion is done automatically by piping the text through |
114
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2370 the |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2371 .Pn iconv |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2372 command, if necessary. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2373 .Ci 2433122c20baccb10b70b49c04c6b0497b5b3b60 |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2374 Custom |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2375 .Pe mhshow-show-* |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2376 rules for textual content might need a |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2377 .Cl "iconv -f %c %f | |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2378 prefix to have the text converted to the native charset. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2379 .P |
121
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
2380 Although the conversion of foreign charsets to the native one |
114
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2381 has improved, it is not consistent enough. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2382 Further work needs to be done and |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2383 the basic concepts in this field need to be re-thought. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2384 Though, the default setup of mmh displays message in foreign charsets |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2385 correctly without the need to configure anything. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2386 |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2387 |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2388 .ig |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2389 |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2390 .P |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2391 mhshow/mhstore: Removed support for retrieving message/external-body parts. |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2392 These tools won't download the contents automatically anymore. Instead, |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2393 they print the information needed to get the contents. If someone should |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2394 really receive one of those rare message/external-body messages, he can |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2395 do the job manually. We save nearly a thousand lines of code. That's worth |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2396 it! |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2397 (The profile entry `nmh-access-ftp' and sbr/ruserpass.c for reading |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2398 ~/.netrc are gone now.) |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2399 .Ci 55e1d8c654ee0f7c45b9361ce34617983b454c32 |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2400 |
92cbd3fa1c40
Wrote text about displaying mime messages.
markus schnalke <meillo@marmaro.de>
parents:
112
diff
changeset
|
2401 .. |
102
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2402 |
58
814c33b96d89
Restructured the content in ch03.
markus schnalke <meillo@marmaro.de>
parents:
51
diff
changeset
|
2403 |
814c33b96d89
Restructured the content in ch03.
markus schnalke <meillo@marmaro.de>
parents:
51
diff
changeset
|
2404 |
814c33b96d89
Restructured the content in ch03.
markus schnalke <meillo@marmaro.de>
parents:
51
diff
changeset
|
2405 .H2 "Digital Cryptography |
22
99409e4546d2
Wrote about the removal of tools.
markus schnalke <meillo@marmaro.de>
parents:
21
diff
changeset
|
2406 .P |
58
814c33b96d89
Restructured the content in ch03.
markus schnalke <meillo@marmaro.de>
parents:
51
diff
changeset
|
2407 Signing and encryption. |
112
4e6a9ae1b53c
Added a bit of text on modern defaults; plus added code refs.
markus schnalke <meillo@marmaro.de>
parents:
110
diff
changeset
|
2408 .P |
4e6a9ae1b53c
Added a bit of text on modern defaults; plus added code refs.
markus schnalke <meillo@marmaro.de>
parents:
110
diff
changeset
|
2409 FIXME |
58
814c33b96d89
Restructured the content in ch03.
markus schnalke <meillo@marmaro.de>
parents:
51
diff
changeset
|
2410 |
814c33b96d89
Restructured the content in ch03.
markus schnalke <meillo@marmaro.de>
parents:
51
diff
changeset
|
2411 |
102
a782488c85f5
More text about attachments mainly, plus some rearrangements.
markus schnalke <meillo@marmaro.de>
parents:
101
diff
changeset
|
2412 |
133
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2413 .H2 "Draft and Trash Folder |
131
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2414 .P |
14
55ec590cfa07
Wrote about the draft folder.
markus schnalke <meillo@marmaro.de>
parents:
12
diff
changeset
|
2415 |
131
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2416 .U3 "Draft Folder |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2417 .P |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2418 In the beginning, MH had the concept of a draft message. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2419 This is the file |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2420 .Fn draft |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2421 in the MH directory, which is treated special. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2422 On composing a message, this draft file was used. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2423 As the draft file was one particular file, only one draft could be |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2424 managed at any time. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2425 When starting to compose another message before the former one was sent, |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2426 the user had to decide among: |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2427 .BU |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2428 Use the old draft to finish and send it before starting with a new one. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2429 .BU |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2430 Discard the old draft, replacing it with the new one. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2431 .BU |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2432 Preserve the old draft by refiling it to a folder. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2433 .P |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2434 This was, it was only possible to work in alternation on multiple drafts. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2435 Therefore, the current draft needed to be refiled to a folder and |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2436 another one re-using for editing. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2437 Working on multiple drafts at the same time was impossible. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2438 The usual approach of switching to a different MH context did not |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2439 change anything. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2440 .P |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2441 The draft folder facility exists to |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2442 allow true parallel editing of drafts, in a straight forward way. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2443 It was introduced by Marshall T. Rose, already in 1984. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2444 Similar to other new features, the draft folder was inactive by default. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2445 Even in nmh, the highly useful draft folder was not available |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2446 out-of-the-box. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2447 At least, Richard Coleman added the man page |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2448 .Mp mh-draft (5) |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2449 to better document the feature. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2450 .P |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2451 Not using the draft folder facility has the single advantage of having |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2452 the draft file at a static location. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2453 This is simple in simple cases but the concept does not scale for more |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2454 complex cases. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2455 The concept of the draft message is too limited for the problem. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2456 Therefore the draft folder was introduced. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2457 It is the more powerful and more natural concept. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2458 The draft folder is a folder like any other folder in MH. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2459 Its messages can be listed like any other messages. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2460 A draft message is no longer a special case. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2461 Tools do not need special switches to work on the draft message. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2462 Hence corner-cases were removed. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2463 .P |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2464 The trivial part of the work was activating the draft folder with a |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2465 default name. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2466 I chose the name |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2467 .Fn +drafts |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2468 for obvious reasons. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2469 In consequence, the command line switches |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2470 .Sw -draftfolder |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2471 and |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2472 .Sw -draftmessage |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2473 could be removed. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2474 More difficult but also more improving was updating the tools to the |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2475 new concept. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2476 For nearly three decades, the tools needed to support two draft handling |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2477 approaches. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2478 By fully switching to the draft folder, the tools could be simplified |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2479 by dropping the awkward draft message handling code. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2480 .Sw -draft |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2481 switches were removed because operating on a draft message is no longer |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2482 special. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2483 It became indistinguishable to operating on any other message. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2484 There is no more need to query the user for draft handling. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2485 It is always possible to add another new draft. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2486 Refiling drafts is without difference to refiling other messages. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2487 All these special cases are gone. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2488 Yet, one draft-related switch remained. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2489 .Pn comp |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2490 still has |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2491 .Sw -[no]use |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2492 for switching between two modes: |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2493 .BU |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2494 .Sw -use : |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2495 Modify an existing draft. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2496 .BU |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2497 .Sw -nouse : |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2498 Compose a new draft, possibly taking some existing message as a form. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2499 .P |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2500 In either case, the behavior of |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2501 .Pn comp |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2502 is deterministic. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2503 .P |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2504 .Pn send |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2505 now operates on the current message in the draft folder by default. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2506 As message and folder can both be overridden by specifying them on |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2507 the command line, it is possible to send any message in the mail storage |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2508 by simply specifying its number and folder. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2509 In contrast to the other tools, |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2510 .Pn send |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2511 takes the draft folder as its default folder. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2512 .P |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2513 Dropping the draft message concept in favor for the draft folder concept, |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2514 removed special cases with regular cases. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2515 This simplified the source code of the tools, as well as the concepts. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2516 In mmh, draft management does not break with the MH concepts |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2517 but applies them. |
133
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2518 .Cl "scan +drafts" , |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2519 for instance, is a truly natural request. |
131
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2520 Most of the work was already done by Rose in the eighties. |
133
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2521 The original improvement of mmh is dropping the old draft message approach |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2522 and thus simplifying the tools, the documentation and the system as a whole. |
131
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2523 Although my part in the draft handling improvement was small, |
133
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2524 it was an important one. |
131
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2525 |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2526 |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2527 .U3 "Trash Folder |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2528 .P |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2529 Similar to the situation for drafts is the situation for removed messages. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2530 Historically, a message was ``deleted'' by prepending a specific |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2531 \fIbackup prefix\fP, usually the comma character, |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2532 to the file name. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2533 The specific message would vanish from MH because only files with |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2534 non-digit characters in their name are not treated as messages. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2535 Although files remained in the file system, |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2536 the messages were no more visible in MH. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2537 To truly delete them, a maintenance job is needed. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2538 Usually a cron job is installed to delete them after a grace time. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2539 For instance: |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2540 .VS |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2541 find $HOME/Mail -type f -name ',*' -ctime +7 -delete |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2542 VE |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2543 In such a setup, the original message can be restored |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2544 within the grace time interval by stripping the |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2545 the backup prefix from the file name. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2546 But one can not rely on this statement. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2547 If the last message of a folder with six messages (1-6) is removed, |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2548 message |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2549 .Fn 6 , |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2550 becomes file |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2551 .Fn ,6 . |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2552 If then a new message enters the same folder, it will be given |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2553 the number one higher than the highest existing message. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2554 In this case the message is named |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2555 .Fn 6 |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2556 then. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2557 If this message is removed as well, |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2558 then the backup of the former message gets overwritten. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2559 Hence, the ability to restore removed messages does not only depend on |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2560 the ``sweeping cron job'' but also on the removing of further messages. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2561 It is undesirable to have such obscure and complex mechanisms. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2562 The user should be given a small set of clear assertions. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2563 ``Removed files are restorable within a seven-day grace time.'' |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2564 is such a clear assertion. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2565 With the addition ``... unless a message with the same name in the |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2566 same folder is removed before.'' the statement becomes complex. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2567 A user will hardly be able to keep track of any removal to know |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2568 if the assertion still holds true for a specific file. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2569 The the real mechanism is practically obscure to the user. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2570 The consequences of further removals are not obvious. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2571 .P |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2572 Further more, the backup files are scattered within the whole mail storage. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2573 This complicates managing them. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2574 It is possible, with help of |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2575 .Pn find , |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2576 but everything would be more convenient |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2577 if the deleted messages would be collected in one place. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2578 .P |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2579 The profile entry |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2580 .Pe rmmproc |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2581 (previously named |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2582 .Pe Delete-Prog ) |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2583 was introduced very early to improve the situation. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2584 It could be set to any command, which would be executed to removed |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2585 the specified messages. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2586 This would override the default action, described above. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2587 Refiling the to-be-removed files to a garbage folder is the usual example. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2588 Nmh's man page |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2589 .Mp rmm (1) |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2590 proposes to set the |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2591 .Pe rmmproc |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2592 to |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2593 .Cl "refile +d |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2594 to move messages to the garbage folder, |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2595 .Fn +d , |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2596 instead of renaming them with the backup prefix. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2597 The man page proposes additionally the expunge command |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2598 .Cl "rm `mhpath +d all` |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2599 to empty the garbage folder. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2600 .P |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2601 Removing messages in such a way has advantages. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2602 The mail storage is prevented from being cluttered with removed messages |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2603 because they are all collected in one place. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2604 Existing and removed messages are thus separated more strictly. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2605 No backup files are silently overwritten. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2606 Most important is the ability to keep removed messages in the MH domain. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2607 Messages in the trash folder can be listed like those in any other folder. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2608 Deleted messages can be displayed like any other messages. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2609 Restoring a deleted messages can be done with |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2610 .Pn refile . |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2611 All operations on deleted files are still covered by the MH tools. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2612 The trash folder is just like any other folder in the mail storage. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2613 .P |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2614 Similar to the draft folder case, I dropped the old backup prefix approach |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2615 in favor for replacing it by the better suiting trash folder system. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2616 Hence, |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2617 .Pn rmm |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2618 calls |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2619 .Pn refile |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2620 to move the to-be-removed message to the trash folder, |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2621 .Fn +trash |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2622 by default. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2623 To sweep it clean, one can use |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2624 .Cl "rmm -unlink +trash a" , |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2625 where the |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2626 .Sw -unlink |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2627 switch causes the files to be unlinked. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2628 .P |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2629 Dropping the legacy approach and completely converting to the new approach |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2630 simplified the code base. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2631 The relationship between |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2632 .Pn rmm |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2633 and |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2634 .Pn refile |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2635 was inverted. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2636 In mmh, |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2637 .Pn rmm |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2638 invokes |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2639 .Pn refile , |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2640 which used to be the other way round. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2641 Yet, the relationship is simpler now. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2642 No more can loops, like described in nmh's man page for |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2643 .Mp refile (1), |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2644 occur: |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2645 .QS |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2646 Since |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2647 .Pn refile |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2648 uses your |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2649 .Pe rmmproc |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2650 to delete the message, the |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2651 .Pe rmmproc |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2652 must NOT call |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2653 .Pn refile |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2654 without specifying |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2655 .Sw -normmproc |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2656 or you will create an infinite loop. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2657 .QE |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2658 .LP |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2659 .Pn rmm |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2660 either unlinks a message with |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2661 .Fu unlink() |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2662 or invokes |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2663 .Pn refile |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2664 to move it to the trash folder. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2665 .Pn refile |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2666 does not invoke any tools. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2667 .P |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2668 |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2669 |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2670 |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2671 Keeping unused alternative in the code is a bad choice as they likely |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2672 gather bugs, by not being constantly tested. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2673 Also, the increased code |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2674 size and more conditions crease the maintenance costs. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2675 |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2676 By generalizing the message removal in a way that it becomes covered |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2677 by the MH concepts makes the whole system more powerful. |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2678 |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2679 |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2680 |
7c741bc8f719
Reorganized: Converted 4-parted discussion into 3-parted discussion.
markus schnalke <meillo@marmaro.de>
parents:
130
diff
changeset
|
2681 |
133
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2682 .H2 "Modern Defaults |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2683 .P |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2684 Nmh has a bunch of convenience-improving features inactive by default, |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2685 although one can expect every new user wanting to have them active. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2686 The reason they are inactive by default is the wish to stay compatible |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2687 with old versions. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2688 But what is the definition for old versions. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2689 Still, the highly useful draft folder facility is not active by default |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2690 although it had been introduced over twenty-five years ago |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2691 .[ |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2692 rose romine real work |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2693 .] |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2694 \(en the community seems not to care. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
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2695 This is one of several examples that require new users to build up |
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2696 their profile before they can access the modern features of nmh. |
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2697 Without an extensively built-up profile, the setup is hardly usable |
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2698 for modern emailing. |
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2699 The point is not the customization of the setup, |
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2700 but the activating of generally useful facilities. |
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2701 .P |
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2702 Yet, the real problem lies less in enabling the features, as this is |
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2703 straight forward as soon as one knows what he wants. |
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2704 The real problem is that new users need deep insights into the project |
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2705 before they find out what they are missing and that nmh actually |
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2706 provides it already, it just was not activated. |
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2707 To give an example, I needed one year of using nmh |
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2708 before I became aware of the existence of the attachment system. |
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2709 One could argue that this fact disqualifies my reading of the |
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2710 documentation. |
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2711 If I would have installed nmh from source back then, I could agree. |
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2712 Yet, I had used a prepackaged version and had expected that it would |
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2713 just work. |
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2714 Nevertheless, I had been convinced by the concepts of MH already |
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2715 and I am a software developer, |
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2716 still I required a lot of time to discover the cool features. |
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2717 How can we expect users to be even more advanced than me, |
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2718 just to allow them use MH in a convenient and modern way? |
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2719 Unless they are strongly convinced of the concepts, they will fail. |
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2720 I have seen friends of me giving up disappointed |
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2721 before they truly used the system, |
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2722 although they had been motivated in the beginning. |
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2723 They suffer hard enough to get used to the toolchest approach, |
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2724 we should spare them further inconveniences. |
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2725 .P |
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2726 Maintaining compatibility for its own sake is for no good. |
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2727 If any MH implementation would be the back-end of widespread |
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2728 email clients with large user bases, compatibility would be more |
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2729 important. |
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2730 Yet, it appears as if this is not the case. |
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2731 Hence, compatibility is hardly important for technical reasons. |
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2732 Its importance originates rather from personal reasons. |
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2733 Nmh's user base is small and old. |
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2734 Changing the interfaces would cause inconvenience to long-term users of MH. |
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2735 It would force them to change their many years old MH configurations. |
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2736 I do understand this aspect, but it keeps new users from using MH. |
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2737 By sticking to the old users, new users are kept away. |
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2738 Yet, the future lies in new users. |
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2739 Hence, mmh invites new users by providing a convenient and modern setup, |
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2740 readily usable out-of-the-box. |
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2741 .P |
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2742 In mmh, all modern features are active by default. |
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2743 In consequence, a setup with a profile that defines only the path to the |
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2744 mail storage, is already convenient to use. |
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2745 Again, Paul Vixie's ``edginess'' appeal supports the direction I took: |
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2746 ``the `main branch' should just be modern''. |
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2747 .[ |
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2748 paul vixie edginess nmh-workers |
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2749 .] |
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2750 .P |
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2751 Modern features that are active in mmh by default include: |
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2752 .BU |
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2753 The attachment system (\c |
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2754 .Hd Attach ). |
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2755 .Ci 8ff284ff9167eff8f5349481529332d59ed913b1 |
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2756 .BU |
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2757 The draft folder facility (\c |
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2758 .Fn +drafts ). |
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2759 .Ci 337338b404931f06f0db2119c9e145e8ca5a9860 |
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2760 .BU |
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2761 The unseen sequence (`u') |
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2762 .Ci c2360569e1d8d3678e294eb7c1354cb8bf7501c1 |
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2763 and the sequence negation prefix (`!'). |
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2764 .Ci db74c2bd004b2dc9bf8086a6d8bf773ac051f3cc |
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2765 .BU |
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2766 Quoting the original message in the reply. |
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2767 .Ci 67411b1f95d6ec987b4c732459e1ba8a8ac192c6 |
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2768 .BU |
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2769 Forwarding messages using MIME. |
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2770 .Ci 6e271608b7b9c23771523f88d23a4d3593010cf1 |
131
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2771 |
133
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2772 |
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2773 |
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2774 |
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2775 |
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2776 .\" -------------------------------------------------------------- |
131
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2777 .H1 "Styling |
16
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Wrote about the trash folder.
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2778 .P |
118
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2779 Kernighan and Pike have emphasized the importance of style in the |
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2780 preface of their book: |
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2781 .[ [ |
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2782 kernighan pike practice of programming |
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2783 .], p. x] |
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2784 .QS |
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2785 Chapter 1 discusses programming style. |
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2786 Good style is so important to good programming that we have chose |
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2787 to cover it first. |
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2788 .QE |
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2789 This section covers changes in mmh that were motivated by the desire |
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2790 to improve on style. |
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2791 Many of them follow the rules given in the quoted book. |
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2792 .[ |
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2793 kernighan pike practice of programming |
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2794 .] |
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2795 |
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2796 |
127
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2797 |
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2798 |
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2799 .H2 "Code Style |
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2800 .P |
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2801 .U3 "Indentation Style |
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2802 .P |
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2803 Indentation styles are the holy cow of programmers. |
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2804 Again Kernighan and Pike: |
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2805 .[ [ |
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2806 kernighan pike practice of programming |
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2807 .], p. 10] |
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2808 .QS |
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2809 Programmers have always argued about the layout of programs, |
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2810 but the specific style is much less important than its consistent |
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2811 application. |
121
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New text on Standard Libraries plus spellchecking.
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2812 Pick one style, preferably ours, use it consistently, and don't waste |
118
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Wrote intro to Modernizing and new text about Code Style.
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2813 time arguing. |
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116
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|
2814 .QE |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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116
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2815 .P |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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2816 I agree that the constant application is most important, |
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Wrote intro to Modernizing and new text about Code Style.
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2817 but I believe that some styles have advantages over others. |
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Wrote intro to Modernizing and new text about Code Style.
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116
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2818 For instance the indentation with tab characters only. |
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Wrote intro to Modernizing and new text about Code Style.
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116
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2819 Tab characters directly map to the nesting level \(en |
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Wrote intro to Modernizing and new text about Code Style.
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2820 one tab, one level. |
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Wrote intro to Modernizing and new text about Code Style.
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2821 Tab characters are flexible because developers can adjust them to |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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2822 whatever width they like to have. |
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Wrote intro to Modernizing and new text about Code Style.
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116
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2823 There is no more need to run |
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Wrote intro to Modernizing and new text about Code Style.
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116
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2824 .Pn unexpand |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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parents:
116
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2825 or |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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116
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|
2826 .Pn entab |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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parents:
116
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|
2827 programs to ensure the correct mixture of leading tabs and spaces. |
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Wrote intro to Modernizing and new text about Code Style.
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116
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2828 The simple rules are: (1) Leading whitespace must consist of tabs only. |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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2829 (2) Any other whitespace should consist of spaces. |
121
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New text on Standard Libraries plus spellchecking.
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2830 These two rules ensure the integrity of the visual appearance. |
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New text on Standard Libraries plus spellchecking.
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2831 Although reformatting existing code should be avoided, I did it. |
118
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Wrote intro to Modernizing and new text about Code Style.
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2832 I did not waste time arguing; I just did it. |
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Wrote intro to Modernizing and new text about Code Style.
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2833 .Ci a485ed478abbd599d8c9aab48934e7a26733ecb1 |
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Wrote intro to Modernizing and new text about Code Style.
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2834 |
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Wrote intro to Modernizing and new text about Code Style.
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2835 .U3 "Comments |
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Wrote intro to Modernizing and new text about Code Style.
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2836 .P |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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2837 Section 1.6 of |
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Wrote intro to Modernizing and new text about Code Style.
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2838 .[ [ |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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2839 kernighan pike practice of programming |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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116
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|
2840 .], p. 23] |
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Wrote intro to Modernizing and new text about Code Style.
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2841 demands: ``Don't belabor the obvious.'' |
122
c234656329e0
Wrote about modularization.
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2842 Hence, I simply removed all the comments in the following code excerpt: |
118
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2843 .VS |
120
e49780100ffb
Wrote about the rework of anno(1).
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2844 context_replace(curfolder, folder); /* update current folder */ |
e49780100ffb
Wrote about the rework of anno(1).
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2845 seq_setcur(mp, mp->lowsel); /* update current message */ |
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Wrote about the rework of anno(1).
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2846 seq_save(mp); /* synchronize message sequences */ |
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Wrote about the rework of anno(1).
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parents:
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2847 folder_free(mp); /* free folder/message structure */ |
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Wrote about the rework of anno(1).
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parents:
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2848 context_save(); /* save the context file */ |
e49780100ffb
Wrote about the rework of anno(1).
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parents:
118
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2849 |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
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|
2850 [...] |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
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|
2851 |
e49780100ffb
Wrote about the rework of anno(1).
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parents:
118
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|
2852 int c; /* current character */ |
e49780100ffb
Wrote about the rework of anno(1).
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2853 char *cp; /* miscellaneous character pointer */ |
e49780100ffb
Wrote about the rework of anno(1).
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parents:
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|
2854 |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2855 [...] |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2856 |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
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|
2857 /* NUL-terminate the field */ |
e49780100ffb
Wrote about the rework of anno(1).
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parents:
118
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|
2858 *cp = '\0'; |
118
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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parents:
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2859 VE |
120
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Wrote about the rework of anno(1).
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parents:
118
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|
2860 .Ci 426543622b377fc5d091455cba685e114b6df674 |
118
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Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2861 .P |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2862 The names of the functions explain enough already. |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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parents:
116
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2863 |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2864 .U3 "Names |
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Wrote intro to Modernizing and new text about Code Style.
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parents:
116
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2865 .P |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2866 Kernighan and Pike suggest: |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2867 ``Use active names for functions''. |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2868 .[ [ |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2869 kernighan pike practice of programming |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2870 .], p. 4] |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2871 One application of this rule was the rename of |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2872 .Fu check_charset() |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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2873 to |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2874 .Fu is_native_charset() . |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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parents:
116
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2875 .Ci 8d77b48284c58c135a6b2787e721597346ab056d |
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Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2876 The same change fixed a violation of ``Be accurate'' as well. |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2877 The code did not match the expectation the function suggested, |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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changeset
|
2878 as it, for whatever reason, only compared the first ten characters |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2879 of the charset name. |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2880 .P |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
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|
2881 More important than using active names is using descriptive names. |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2882 Renaming the obscure function |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
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|
2883 .Fu m_unknown() |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2884 was a delightful event. |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2885 .Ci 611d68d19204d7cbf5bd585391249cb5bafca846 |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2886 .P |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
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|
2887 Magic numbers are generally considered bad style. |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
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|
2888 Obviously, Kernighan and Pike agree: |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
changeset
|
2889 ``Give names to magic numbers''. |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
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|
2890 .[ [ |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
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|
2891 kernighan pike practice of programming |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2892 .], p. 19] |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2893 One such change was naming the type of input \(en mbox or mail folder \(en |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
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|
2894 to be scanned: |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
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|
2895 .VS |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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parents:
116
diff
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|
2896 #define SCN_MBOX (-1) |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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parents:
116
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|
2897 #define SCN_FOLD 0 |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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parents:
116
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|
2898 VE |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
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|
2899 .Ci 7ffb36d28e517a6f3a10272056fc127592ab1c19 |
48e28eaee6f9
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markus schnalke <meillo@marmaro.de>
parents:
116
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|
2900 .P |
48e28eaee6f9
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parents:
116
diff
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|
2901 The argument |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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parents:
116
diff
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|
2902 .Ar outnum |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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parents:
116
diff
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|
2903 of the function |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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116
diff
changeset
|
2904 .Fu scan() |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
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|
2905 in |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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parents:
116
diff
changeset
|
2906 .Fn uip/scansbr.c |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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parents:
116
diff
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|
2907 defines the number of the message to be created. |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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parents:
116
diff
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|
2908 If no message is to be created, the argument is misused to transport |
48e28eaee6f9
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116
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|
2909 program logic. |
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116
diff
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|
2910 This lead to obscure code. |
48e28eaee6f9
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parents:
116
diff
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|
2911 I improved the clarity of the code by introducing two variables: |
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Wrote intro to Modernizing and new text about Code Style.
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116
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|
2912 .VS |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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116
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|
2913 int incing = (outnum > 0); |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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parents:
116
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|
2914 int ismbox = (outnum != 0); |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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116
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2915 VE |
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116
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|
2916 They cover the magic values and are used for conditions. |
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116
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2917 The variable |
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2918 .Ar outnum |
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116
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|
2919 is only used when it holds an ordinary message number. |
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116
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2920 .Ci b8b075c77be7794f3ae9ff0e8cedb12b48fd139f |
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116
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|
2921 The clarity improvement of the change showed detours in the program logic |
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116
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2922 of related code parts. |
48e28eaee6f9
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116
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|
2923 Having the new variables with descriptive names, a more |
121
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
2924 straight forward implementation became apparent. |
118
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
changeset
|
2925 Before the clarification was done, |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
changeset
|
2926 the possibility to improve had not be seen. |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
changeset
|
2927 .Ci aa60b0ab5e804f8befa890c0a6df0e3143ce0723 |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
changeset
|
2928 |
133
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2929 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2930 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2931 .H2 "Structural Rework |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2932 .P |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
2933 |
118
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
changeset
|
2934 .U3 "Rework of \f(CWanno\fP |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
changeset
|
2935 .P |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
changeset
|
2936 At the end of their chapter on style, |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
changeset
|
2937 Kernighan and Pike ask: ``But why worry about style?'' |
121
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
2938 The following example of my rework of |
120
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2939 .Pn anno |
121
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
2940 provides an answer why style is important in the first place. |
120
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2941 .P |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2942 Until 2002, |
118
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
changeset
|
2943 .Pn anno |
120
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2944 had six functional command line switches, |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2945 .Sw -component |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2946 and |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2947 .Sw -text , |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2948 which took an argument each, |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2949 and the two pairs of flags, |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2950 .Sw -[no]date |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2951 and |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2952 .Sw -[no]inplace., |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2953 .Sw -component |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2954 and |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2955 .Sw -text , |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2956 which took an argument each, |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2957 and the two pairs of flags, |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2958 .Sw -[no]date |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2959 and |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2960 .Sw -[no]inplace . |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2961 Then Jon Steinhart introduced his attachment system. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2962 In need for more advanced annotation handling, he extended |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2963 .Pn anno . |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2964 He added five more switches: |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2965 .Sw -draft , |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2966 .Sw -list , |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2967 .Sw -delete , |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2968 .Sw -append , |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2969 and |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2970 .Sw -number , |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2971 the last one taking an argument. |
121
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
2972 .Ci 7480dbc14bc90f2d872d434205c0784704213252 |
120
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2973 Later, |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2974 .Sw -[no]preserve |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2975 was added. |
121
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
2976 .Ci d9b1d57351d104d7ec1a5621f090657dcce8cb7f |
120
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2977 Then, the Synopsis section of the man page |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2978 .Mp anno (1) |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2979 read: |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2980 .VS |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2981 anno [+folder] [msgs] [-component field] [-inplace | -noinplace] |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2982 [-date | -nodate] [-draft] [-append] [-list] [-delete] |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2983 [-number [num|all]] [-preserve | -nopreserve] [-version] |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2984 [-help] [-text body] |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2985 VE |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2986 .LP |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2987 The implementation followed the same structure. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2988 Problems became visible when |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2989 .Cl "anno -list -number 42 |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2990 worked on the current message instead on message number 42, |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2991 and |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2992 .Cl "anno -list -number l:5 |
124 | 2993 did not work on the last five messages but failed with the mysterious |
120
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2994 error message: ``anno: missing argument to -list''. |
121
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
2995 Yet, the invocation matched the specification in the man page. |
120
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2996 There, the correct use of |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2997 .Sw -number |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2998 was defined as being |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
2999 .Cl "[-number [num|all]] |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3000 and the textual description for the combination with |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3001 .Sw -list |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3002 read: |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3003 .QS |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3004 The -list option produces a listing of the field bodies for |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3005 header fields with names matching the specified component, |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3006 one per line. The listing is numbered, starting at 1, if |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3007 the -number option is also used. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3008 .QE |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3009 .LP |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3010 The problem was manifold. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3011 The code required a numeric argument to the |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3012 .Sw -number |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3013 switch. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3014 If it was missing or non-numeric, |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3015 .Pn anno |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3016 aborted with an error message that had an off-by-one error, |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3017 printing the switch one before the failing one. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3018 Semantically, the argument to the |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3019 .Sw -number |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3020 switch is only necessary in combination with |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3021 .Sw -delete , |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3022 but not with |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3023 .Sw -list . |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3024 In the former case it is even necessary. |
118
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
changeset
|
3025 .P |
120
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3026 Trying to fix these problems on the surface would not have solved it truly. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3027 The problems discovered originate from a discrepance between the semantic |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3028 structure of the problem and the structure implemented in the program. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3029 Such structural differences can not be cured on the surface. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3030 They need to be solved by adjusting the structure of the implementation |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3031 to the structure of the problem. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3032 .P |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3033 In 2002, the new switches |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3034 .Sw -list |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3035 and |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3036 .Sw -delete |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3037 were added in the same way, the |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3038 .Sw -number |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3039 switch for instance had been added. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3040 Yet, they are of structural different type. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3041 Semantically, |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3042 .Sw -list |
e49780100ffb
Wrote about the rework of anno(1).
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parents:
118
diff
changeset
|
3043 and |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3044 .Sw -delete |
e49780100ffb
Wrote about the rework of anno(1).
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parents:
118
diff
changeset
|
3045 introduce modes of operation. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3046 Historically, |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3047 .Pn anno |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3048 had only one operation mode: adding header fields. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3049 With the extension, it got two moder modes: |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3050 listing and deleting header fields. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3051 The structure of the code changes did not pay respect to this |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3052 fundamental change to |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3053 .Pn anno 's |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3054 behavior. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3055 Neither the implementation nor the documentation did clearly |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3056 define them as being exclusive modes of operation. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3057 Having identified the problem, I solved it by putting structure into |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3058 .Pn anno |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3059 and its documentation. |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3060 .Ci d54c8db8bdf01e8381890f7729bc0ef4a055ea11 |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3061 .P |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3062 The difference is visible in both, the code and the documentation. |
121
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3063 The following code excerpt: |
120
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3064 .VS |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3065 int delete = -2; /* delete header element if set */ |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3066 int list = 0; /* list header elements if set */ |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3067 [...] |
121
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3068 case DELETESW: /* delete annotations */ |
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
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parents:
120
diff
changeset
|
3069 delete = 0; |
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3070 continue; |
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3071 case LISTSW: /* produce a listing */ |
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3072 list = 1; |
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3073 continue; |
120
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3074 VE |
121
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3075 .LP |
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3076 was replaced by: |
120
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3077 .VS |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3078 static enum { MODE_ADD, MODE_DEL, MODE_LIST } mode = MODE_ADD; |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3079 [...] |
121
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3080 case DELETESW: /* delete annotations */ |
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3081 mode = MODE_DEL; |
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3082 continue; |
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3083 case LISTSW: /* produce a listing */ |
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3084 mode = MODE_LIST; |
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3085 continue; |
120
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3086 VE |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3087 .LP |
121
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3088 The replacement code does not only reflect the problem's structure better, |
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3089 it is easier to understand as well. |
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3090 The same applies to the documentation. |
120
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3091 The man page was completely reorganized to propagate the same structure. |
121
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3092 This is visible in the Synopsis section: |
120
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3093 .VS |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3094 anno [+folder] [msgs] [-component field] [-text body] |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3095 [-append] [-date | -nodate] [-preserve | -nopreserve] |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3096 [-Version] [-help] |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3097 |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3098 anno -delete [+folder] [msgs] [-component field] [-text |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3099 body] [-number num | all ] [-preserve | -nopreserve] |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3100 [-Version] [-help] |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3101 |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3102 anno -list [+folder] [msgs] [-component field] [-number] |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3103 [-Version] [-help] |
e49780100ffb
Wrote about the rework of anno(1).
markus schnalke <meillo@marmaro.de>
parents:
118
diff
changeset
|
3104 VE |
121
edbc6e1dc636
New text on Standard Libraries plus spellchecking.
markus schnalke <meillo@marmaro.de>
parents:
120
diff
changeset
|
3105 .\" XXX think about explaining the -preserve rework? |
118
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
changeset
|
3106 |
16
81f703140554
Wrote about the trash folder.
markus schnalke <meillo@marmaro.de>
parents:
14
diff
changeset
|
3107 |
0
dc2bfef4cda7
Initial commit: Basic structure, macros and fonts.
markus schnalke <meillo@marmaro.de>
parents:
diff
changeset
|
3108 |
133
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3109 .U3 "Path Conversion |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3110 .P |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3111 FIXME! XXX |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3112 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3113 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3114 commit d39e2c447b0d163a5a63f480b23d06edb7a73aa0 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3115 Author: markus schnalke <meillo@marmaro.de> |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3116 Date: Fri Dec 9 16:34:57 2011 +0100 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3117 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3118 Completely reworked the path convertion functions |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3119 Moved everything (from sbr/getfolder.c and sbr/m_maildir.c) into |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3120 sbr/path.c, but actually replaced the code almost completely. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3121 See h/prototypes.h for the function changes. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3122 sbr/path.c provides explaining comments on the functions. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3123 None of them allocates memory automatically. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3124 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3125 Additionally: |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3126 - Like for other ``files'', `inc -audit file' places file relative |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3127 to the cwd, not relative to the mh-dir. This is for consistency. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3128 - Replaced add(foo, NULL) with getcpy(foo), which ist clearer. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3129 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3130 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3131 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3132 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3133 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3134 .H2 "Profile Reading |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3135 .P |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3136 FIXME XXX |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3137 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3138 commit 3e017a7abbdf69bf0dff7a4073275961eda1ded8 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3139 Author: markus schnalke <meillo@marmaro.de> |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3140 Date: Wed Jun 27 14:23:35 2012 +0200 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3141 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3142 spost: Read profile and context now. Removed -library switch. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3143 spost is a full part of the mmh toolchest, hence, it shall read the |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3144 profile/context. This will remove the need to pass profile information |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3145 from send to spost via command line switches. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3146 In January 2012, there had been a discussion on the nmh-workers ML |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3147 whether post should read the profile/context. There wasn't a clear |
02660c14f6a8
Further re-ordering of the sections.
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parents:
131
diff
changeset
|
3148 answer. It behavior was mainly motivated by the historic situation, |
02660c14f6a8
Further re-ordering of the sections.
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parents:
131
diff
changeset
|
3149 it seems. My opinion on the topic goes into the direction that every |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3150 tool that is part of the mmh toolchest should read the profile. That |
02660c14f6a8
Further re-ordering of the sections.
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parents:
131
diff
changeset
|
3151 is a clear and simple concept. Using MH tools without wanting to |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3152 interact with MH (like mhmail had been) is no more a practical problem. |
02660c14f6a8
Further re-ordering of the sections.
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parents:
131
diff
changeset
|
3153 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3154 commit 32d4f9daaa70519be3072479232ff7be0500d009 |
02660c14f6a8
Further re-ordering of the sections.
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parents:
131
diff
changeset
|
3155 Author: markus schnalke <meillo@marmaro.de> |
02660c14f6a8
Further re-ordering of the sections.
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parents:
131
diff
changeset
|
3156 Date: Wed Jun 27 13:15:47 2012 +0200 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3157 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3158 mhmail: Read the context! |
02660c14f6a8
Further re-ordering of the sections.
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parents:
131
diff
changeset
|
3159 mhmail will change from a mailx-replacment to an alternative to |
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3160 `comp -ed prompter', thus being a send front-end. Hence, mhmail |
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3161 should not stay outside the profile/context respecting mmh toolchest. |
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3162 |
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3163 |
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3164 slocal |
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3165 |
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3166 |
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3167 |
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3168 |
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3169 .H2 "Standard Libraries |
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3170 .P |
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3171 MH is one decade older than the POSIX and ANSI C standards. |
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3172 Hence, MH included own implementations of functions |
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3173 that are standardized and thus widely available today, |
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3174 but were not back then. |
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3175 Today, twenty years after the POSIX and ANSI C were published, |
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3176 developers can expect system to comply with these standards. |
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3177 In consequence, MH-specific replacements for standard functions |
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3178 can and should be dropped. |
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3179 Kernighan and Pike advise: ``Use standard libraries.'' |
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3180 .[ [ |
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3181 kernighan pike practice of programming |
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3182 .], p. 196] |
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3183 Actually, MH had followed this advice in history, |
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3184 but it had not adjusted to the changes in this field. |
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3185 The |
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3186 .Fu snprintf() |
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3187 function, for instance, was standardized with C99 and is available |
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3188 almost everywhere because of its high usefulness. |
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3189 In project's own implementation of |
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3190 .Fu snprintf() |
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3191 was dropped in March 2012 in favor for using the one of the |
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3192 standard library. |
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3193 .Ci 0052f1024deb0a0a2fc2e5bacf93d45a5a9c9b32 |
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3194 Such decisions limit the portability of mmh |
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3195 if systems don't support these standardized and widespread functions. |
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3196 This compromise is made because mmh focuses on the future. |
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3197 .P |
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3198 I am not yet thirty years old and my C and Unix experience comprises |
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3199 only half a dozen years. |
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3200 Hence, I need to learn about the history in retrospective. |
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3201 I have not used those ancient constructs myself. |
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3202 I have not suffered from their incompatibilities. |
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3203 I have not longed for standardization. |
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3204 All my programming experience is from a time when ANSI C and POSIX |
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3205 were well established already. |
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3206 I have only read a lot of books about the (good) old times. |
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3207 This puts me in a difficult positions when working with old code. |
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3208 I need to freshly acquire knowledge about old code constructs and ancient |
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3209 programming styles, whereas older programmers know these things by |
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3210 heart from their own experience. |
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3211 .P |
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3212 Being aware of the situation, I rather let people with more historic |
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3213 experience replace ancient code constructs with standardized ones. |
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3214 Lyndon Nerenberg covered large parts of this task for the nmh project. |
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3215 He converted project-specific functions to POSIX replacements, |
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3216 also removing the conditionals compilation of now standardized features. |
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3217 Ken Hornstein and David Levine had their part in the work, too. |
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3218 Often, I only needed to pull over changes from nmh into mmh. |
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3219 These changes include many commits; these are among them: |
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3220 .Ci 768b5edd9623b7238e12ec8dfc409b82a1ed9e2d |
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3221 .Ci 0052f1024deb0a0a2fc2e5bacf93d45a5a9c9b32 . |
102
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3222 .P |
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3223 During my own work, I tidied up the \fIMH standard library\fP, |
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3224 .Fn libmh.a , |
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3225 which is located in the |
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3226 .Fn sbr |
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3227 (``subroutines'') directory in the source tree. |
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3228 The MH library includes functions that mmh tools usually need. |
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3229 Among them are MH-specific functions for profile, context, sequence, |
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3230 and folder handling, but as well |
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3231 MH-independent functions, such as auxiliary string functions, |
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3232 portability interfaces and error-checking wrappers for critical |
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3233 functions of the standard library. |
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3234 .P |
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3235 I have replaced the |
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3236 .Fu atooi() |
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3237 function with calls to |
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3238 .Fu strtoul() |
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3239 with the third parameter \(en the base \(en set to eight. |
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3240 .Fu strtoul() |
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3241 is part of C89 and thus considered safe to use. |
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3242 .Ci c490c51b3c0f8871b6953bd0c74551404f840a74 |
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3243 .P |
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3244 I did remove project-included fallback implementations of |
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3245 .Fu memmove() |
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3246 and |
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3247 .Fu strerror() , |
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3248 although Peter Maydell had re-included them into nmh in 2008 |
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3249 to support SunOS 4. |
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3250 Nevertheless, these functions are part of ANSI C. |
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3251 Systems that do not even provide full ANSI C support should not |
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3252 put a load on mmh. |
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3253 .Ci b067ff5c465a5d243ce5a19e562085a9a1a97215 |
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3254 .P |
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3255 The |
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3256 .Fu copy() |
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3257 function copies the string in argument one to the location in two. |
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3258 In contrast to |
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3259 .Fu strcpy() , |
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3260 it returns a pointer to the terminating null-byte in the destination area. |
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3261 The code was adjusted to replace |
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3262 .Fu copy() |
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3263 with |
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3264 .Fu strcpy() , |
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3265 except within |
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3266 .Fu concat() , |
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3267 where |
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3268 .Fu copy() |
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3269 was more convenient. |
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3270 Therefore, the definition of |
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3271 .Fu copy() |
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3272 was moved into the source file of |
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3273 .Fu concat() |
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3274 and its visibility is now limited to it. |
121
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3275 .Ci 552fd7253e5ee9e554c5c7a8248a6322aa4363bb |
102
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More text about attachments mainly, plus some rearrangements.
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|
3276 .P |
121
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3277 The function |
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New text on Standard Libraries plus spellchecking.
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3278 .Fu r1bindex() |
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New text on Standard Libraries plus spellchecking.
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3279 had been a generalized version of |
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New text on Standard Libraries plus spellchecking.
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3280 .Fu basename() |
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New text on Standard Libraries plus spellchecking.
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3281 with minor differences. |
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New text on Standard Libraries plus spellchecking.
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3282 As all calls to |
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3283 .Fu r1bindex() |
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3284 had the slash (`/') as delimiter anyway, |
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3285 replacing |
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|
3286 .Fu r1bindex() |
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3287 with the more specific and better-named function |
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New text on Standard Libraries plus spellchecking.
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3288 .Fu basename() |
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3289 became desirable. |
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New text on Standard Libraries plus spellchecking.
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|
3290 Unfortunately, many of the 54 calls to |
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3291 .Fu r1bindex() |
123
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3292 depended on a special behavior, |
121
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3293 which differed from the POSIX specification for |
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New text on Standard Libraries plus spellchecking.
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3294 .Fu basename() . |
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New text on Standard Libraries plus spellchecking.
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3295 Hence, |
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New text on Standard Libraries plus spellchecking.
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|
3296 .Fu r1bindex() |
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3297 was kept but renamed to |
123
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3298 .Fu mhbasename() , |
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3299 fixing the delimiter to the slash. |
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3300 .Ci 240013872c392fe644bd4f79382d9f5314b4ea60 |
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3301 For possible uses of |
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New text on Standard Libraries plus spellchecking.
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3302 .Fu r1bindex() |
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3303 with a different delimiter, |
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New text on Standard Libraries plus spellchecking.
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3304 the ANSI C function |
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New text on Standard Libraries plus spellchecking.
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3305 .Fu strrchr() |
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New text on Standard Libraries plus spellchecking.
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3306 provides the core functionality. |
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New text on Standard Libraries plus spellchecking.
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3307 .P |
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New text on Standard Libraries plus spellchecking.
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|
3308 The |
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New text on Standard Libraries plus spellchecking.
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|
3309 .Fu ssequal() |
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New text on Standard Libraries plus spellchecking.
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3310 function \(en apparently for ``substring equal'' \(en |
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|
3311 was renamed to |
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New text on Standard Libraries plus spellchecking.
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|
3312 .Fu isprefix() , |
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New text on Standard Libraries plus spellchecking.
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3313 because this is what it actually checks. |
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3314 .Ci c20b4fa14515c7ab388ce35411d89a7a92300711 |
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3315 Its source file had included the following comments, no joke. |
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|
3316 .VS |
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New text on Standard Libraries plus spellchecking.
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|
3317 /* |
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New text on Standard Libraries plus spellchecking.
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3318 * THIS CODE DOES NOT WORK AS ADVERTISED. |
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3319 * It is actually checking if s1 is a PREFIX of s2. |
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3320 * All calls to this function need to be checked to see |
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3321 * if that needs to be changed. Prefix checking is cheaper, so |
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3322 * should be kept if it's sufficient. |
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|
3323 */ |
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|
3324 |
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New text on Standard Libraries plus spellchecking.
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|
3325 /* |
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|
3326 * Check if s1 is a substring of s2. |
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3327 * If yes, then return 1, else return 0. |
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|
3328 */ |
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|
3329 VE |
123
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3330 Two months later, it was completely removed by replacing it with |
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3331 .Fu strncmp() . |
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|
3332 .Ci b0b1dd37ff515578cf7cba51625189eb34a196cb |
121
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New text on Standard Libraries plus spellchecking.
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|
3333 |
118
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Wrote intro to Modernizing and new text about Code Style.
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diff
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|
3334 |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
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|
3335 |
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Wrote intro to Modernizing and new text about Code Style.
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|
3336 |
133
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Further re-ordering of the sections.
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3337 |
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3338 .H2 "User Data Locations |
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3339 .P |
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3340 In nmh, a personal setup consists of the MH profile and the MH directory. |
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3341 The profile is a file named |
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3342 .Fn \&.mh_profile |
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3343 in the user's home directory. |
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3344 It contains the static configuration. |
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3345 It also contains the location of the MH directory in the profile entry |
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3346 .Pe Path . |
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3347 The MH directory contains the mail storage and is the first |
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3348 place to search for personal forms, scan formats, and similar |
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3349 configuration files. |
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3350 The location of the MH directory can be chosen freely by the user. |
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3351 The default and usual name is a directory named |
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|
3352 .Fn Mail |
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|
3353 in the home directory. |
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|
3354 .P |
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|
3355 The way MH data is splitted between profile and MH directory is a legacy. |
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|
3356 It is only sensible in a situation where the profile is the only |
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|
3357 configuration file. |
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|
3358 Why else should the mail storage and the configuration files be intermixed? |
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|
3359 They are different kinds of data: |
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|
3360 The data to be operated on and the configuration to change how |
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|
3361 tools operate. |
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|
3362 Splitting the configuration between the profile and the MH directory |
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|
3363 is bad. |
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|
3364 Merging the mail storage and the configuration in one directory is bad |
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|
3365 as well. |
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|
3366 As the mail storage and the configuration were not separated sensibly |
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Further re-ordering of the sections.
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|
3367 in the first place, I did it now. |
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|
3368 .P |
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|
3369 Personal mmh data is grouped by type, resulting in two distinct parts: |
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Further re-ordering of the sections.
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|
3370 The mail storage and the configuration. |
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Further re-ordering of the sections.
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|
3371 In mmh, the mail storage directory still contains all the messages, |
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Further re-ordering of the sections.
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|
3372 but, in exception of public sequences files, nothing else. |
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diff
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|
3373 In difference to nmh, the auxiliary configuration files are no longer |
02660c14f6a8
Further re-ordering of the sections.
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diff
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|
3374 located there. |
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Further re-ordering of the sections.
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diff
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|
3375 Therefore, the directory is no longer called the user's \fIMH directory\fP |
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Further re-ordering of the sections.
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diff
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|
3376 but his \fImail storage\fP. |
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Further re-ordering of the sections.
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diff
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|
3377 Its location is still user-chosen, with the default name |
02660c14f6a8
Further re-ordering of the sections.
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diff
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|
3378 .Fn Mail , |
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Further re-ordering of the sections.
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diff
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|
3379 in the user's home directory. |
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Further re-ordering of the sections.
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diff
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|
3380 In mmh, the configuration is grouped together in |
02660c14f6a8
Further re-ordering of the sections.
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131
diff
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|
3381 the hidden directory |
02660c14f6a8
Further re-ordering of the sections.
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diff
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|
3382 .Fn \&.mmh |
02660c14f6a8
Further re-ordering of the sections.
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diff
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|
3383 in the user's home directory. |
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Further re-ordering of the sections.
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diff
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|
3384 This \fImmh directory\fP contains the context file, personal forms, |
02660c14f6a8
Further re-ordering of the sections.
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diff
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|
3385 scan formats, and the like, but also the user's profile, now named |
02660c14f6a8
Further re-ordering of the sections.
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131
diff
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|
3386 .Fn profile . |
02660c14f6a8
Further re-ordering of the sections.
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parents:
131
diff
changeset
|
3387 The location of the profile is no longer fixed to |
02660c14f6a8
Further re-ordering of the sections.
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131
diff
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|
3388 .Fn $HOME/.mh_profile |
02660c14f6a8
Further re-ordering of the sections.
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131
diff
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|
3389 but to |
02660c14f6a8
Further re-ordering of the sections.
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parents:
131
diff
changeset
|
3390 .Fn $HOME/.mmh/profile . |
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Further re-ordering of the sections.
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131
diff
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|
3391 Having both, the file |
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Further re-ordering of the sections.
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diff
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|
3392 .Fn $HOME/.mh_profile |
02660c14f6a8
Further re-ordering of the sections.
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diff
changeset
|
3393 and the configuration directory |
02660c14f6a8
Further re-ordering of the sections.
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parents:
131
diff
changeset
|
3394 .Fn $HOME/.mmh |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3395 appeared to be inconsistent. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3396 The approach chosen for mmh is consistent, simple, and familiar to |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3397 Unix users. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3398 .P |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3399 MH allows users to have multiiple MH setups. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3400 Therefore, it is necessary to select a different profile. |
02660c14f6a8
Further re-ordering of the sections.
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parents:
131
diff
changeset
|
3401 The profile is the single entry point to access the rest of a |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3402 personal MH setup. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3403 In nmh, the environment variable |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3404 .Ev MH |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3405 could be used to specifiy a different profile. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3406 To operate in the same MH setup with a separate context, |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3407 the |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3408 .Ev MHCONTEXT |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3409 environment variable could be used. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3410 This allows having own current folders and current messages in |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3411 each terminal, for instance. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3412 In mmh, three environment variables are used. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3413 .Ev MMH |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3414 overrides the default location of the mmh directory (\c |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3415 .Fn .mmh ). |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3416 .Ev MMHP |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3417 and |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3418 .Ev MMHC |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3419 override the paths to the profile and context files, respectively. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3420 This approach allows the set of personal configuration files to be chosen |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3421 independently from the profile, context, and mail storage. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3422 .P |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3423 The separation of the files by type is sensible and convenient. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3424 The new approach has no functional disadvantages, |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3425 as every setup I can imagine can be implemented with both approaches, |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3426 possibly even easier with the new approach. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3427 The main achievement of the change is the clear and sensible split |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3428 between mail storage and configuration. |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3429 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3430 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3431 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3432 |
02660c14f6a8
Further re-ordering of the sections.
markus schnalke <meillo@marmaro.de>
parents:
131
diff
changeset
|
3433 |
118
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
changeset
|
3434 .H2 "Modularization |
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
changeset
|
3435 .P |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3436 The source code of the mmh tools is located in the |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3437 .Fn uip |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3438 (``user interface programs'') directory. |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3439 Each tools has a source file with the same name. |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3440 For example, |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3441 .Pn rmm |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3442 is built from |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3443 .Fn uip/rmm.c . |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3444 Some source files are used for multiple programs. |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3445 For example |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3446 .Fn uip/scansbr.c |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3447 is used for both, |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3448 .Pn scan |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3449 and |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3450 .Pn inc . |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3451 In nmh, 49 tools were built from 76 source files. |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3452 This is a ratio of 1.6 source files per program. |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3453 32 programs depended on multiple source files; |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3454 17 programs depended on one source file only. |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3455 In mmh, 39 tools are built from 51 source files. |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3456 This is a ratio of 1.3 source files per program. |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3457 18 programs depend on multiple source files; |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3458 21 programs depend on one source file only. |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3459 (These numbers and the ones in the following text ignore the MH library |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3460 as well as shell scripts and multiple names for the same program.) |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3461 .P |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3462 Splitting the source code of a large program into multiple files can |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3463 increase the readability of its source code. |
124 | 3464 Most of the mmh tools, however, are simple and straight-forward programs. |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3465 With the exception of the MIME handling tools, |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3466 .Pn pick |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3467 is the largest tools. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3468 It contains 1\|037 lines of source code (measured with |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3469 .Pn sloccount ), excluding the MH library. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3470 Only the MIME handling tools (\c |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3471 .Pn mhbuild , |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3472 .Pn mhstore , |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3473 .Pn show , |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3474 etc.) |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3475 are larger. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3476 Splitting programs with less than 1\|000 lines of code into multiple |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3477 source files seldom leads to better readability. |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3478 For such tools, splitting makes sense |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3479 when parts of the code are reused in other programs, |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3480 and the reused code fragment is not general enough |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3481 for including it in the MH library, |
124 | 3482 or, if the code has dependencies on a library that only few programs need. |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3483 .Fn uip/packsbr.c , |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3484 for instance, provides the core program logic for the |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3485 .Pn packf |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3486 and |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3487 .Pn rcvpack |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3488 programs. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3489 .Fn uip/packf.c |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3490 and |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3491 .Fn uip/rcvpack.c |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3492 mainly wrap the core function appropriately. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3493 No other tools use the folder packing functions. |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3494 As another example, |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3495 .Fn uip/termsbr.c |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3496 provides termcap support, which requires linking with a termcap or |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3497 curses library. |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3498 Including |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3499 .Fn uip/termsbr.c |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3500 into the MH library would require every program to be linked with |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3501 termcap or curses, although only few of the programs require it. |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3502 .P |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3503 The task of MIME handling is complex enough that splitting its code |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3504 into multiple source files improves the readability. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3505 The program |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3506 .Pn mhstore , |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3507 for instance, is compiled out of seven source files with 2\|500 |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3508 lines of code in summary. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3509 The main code file |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3510 .Fn uip/mhstore.c |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3511 consists of 800 lines; the other 1\|700 lines of code are reused in |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3512 other MIME handling tools. |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3513 It seems to be worthwhile to bundle the generic MIME handling code into |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3514 a MH-MIME library, as a companion to the MH standard library. |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3515 This is left open for the future. |
118
48e28eaee6f9
Wrote intro to Modernizing and new text about Code Style.
markus schnalke <meillo@marmaro.de>
parents:
116
diff
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|
3516 .P |
123
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Reworked and extended the text about Modularization.
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|
3517 The work already done, focussed on the non-MIME tools. |
122
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Wrote about modularization.
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parents:
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diff
changeset
|
3518 The amount of code compiled into each program was reduced. |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3519 This eases the understanding of the code base. |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3520 In nmh, |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3521 .Pn comp |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3522 was built from six source files: |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3523 .Fn comp.c , |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3524 .Fn whatnowproc.c , |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3525 .Fn whatnowsbr.c , |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
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|
3526 .Fn sendsbr.c , |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3527 .Fn annosbr.c , |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3528 and |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
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|
3529 .Fn distsbr.c . |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
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121
diff
changeset
|
3530 In mmh, it builds from only two: |
c234656329e0
Wrote about modularization.
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parents:
121
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|
3531 .Fn comp.c |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3532 and |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3533 .Fn whatnowproc.c . |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3534 In nmh's |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3535 .Pn comp , |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3536 the core function of |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3537 .Pn whatnow , |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3538 .Pn send , |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3539 and |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3540 .Pn anno |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3541 were compiled into |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3542 .Pn comp . |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3543 This saved the need to execute these programs with |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3544 .Fu fork() |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3545 and |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3546 .Fu exec() , |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3547 two expensive system calls. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3548 Whereis this approach improved the time performance, |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3549 it interweaved the source code. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3550 Core functionalities were not encapsulated into programs but into |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3551 function, which were then wrapped by programs. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3552 For example, |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3553 .Fn uip/annosbr.c |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3554 included the function |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3555 .Fu annotate() . |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3556 Each program that wanted to annotate messages, included the source file |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3557 .Fn uip/annosbr.c |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3558 and called |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3559 .Fu annotate() . |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3560 Because the function |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3561 .Fu annotate() |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3562 was used like the tool |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3563 .Pn anno , |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3564 it had seven parameters, reflecting the command line switches of the tool. |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3565 When another pair of command line switches was added to |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3566 .Pn anno , |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3567 a rather ugly hack was implemented to avoid adding another parameter |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3568 to the function. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3569 .Ci d9b1d57351d104d7ec1a5621f090657dcce8cb7f |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
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|
3570 .P |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3571 Separation simplifies the understanding of program code |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3572 because the area influenced by any particular statement is smaller. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3573 The separating on the program-level is more strict than the separation |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3574 on the function level. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3575 In mmh, the relevant code of |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3576 .Pn comp |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3577 comprises the two files |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3578 .Fn uip/comp.c |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3579 and |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3580 .Fn uip/whatnowproc.c , |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3581 together 210 lines of code. |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3582 In nmh, |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3583 .Pn comp |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3584 comprises six files with 2\|450 lines. |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3585 Not all of the code in these six files was actually used by |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3586 .Pn comp , |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3587 but the code reader needed to read all of the code first to know which |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3588 parts were used. |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3589 .P |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3590 As I have read a lot in the code base during the last two years, |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3591 I learned about the easy and the difficult parts. |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3592 Code is easy to understand if: |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3593 .BU |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3594 The influenced code area is small |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3595 .BU |
124 | 3596 The boundaries are strictly defined |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3597 .BU |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3598 The code is written straight-forward |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3599 .P |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3600 .\" XXX move this paragraph somewhere else? |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3601 Reading |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3602 .Pn rmm 's |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3603 source code in |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3604 .Fn uip/rmm.c |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3605 is my recommendation for a beginner's entry point into the code base of nmh. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3606 The reasons are that the task of |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3607 .Pn rmm |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3608 is straight forward and it consists of one small source code file only, |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3609 yet its source includes code constructs typical for MH tools. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3610 With the introduction of the trash folder in mmh, |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3611 .Pn rmm |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3612 became a bit more complex, because it invokes |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3613 .Pn refile . |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3614 Still, it is a good example for a simple tool with clear sources. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3615 .P |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3616 Understanding |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3617 .Pn comp |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3618 requires to read 210 lines of code in mmh, but ten times as much in nmh. |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3619 Due to the aforementioned hack in |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3620 .Pn anno |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3621 to save the additional parameter, information passed through the program's |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3622 source base in obscure ways. |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3623 Thus, understanding |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3624 .Pn comp , |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3625 required understanding the inner workings of |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3626 .Fn uip/annosbr.c |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3627 first. |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3628 To be sure to fully understand a program, its whole source code needs |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3629 to be examined. |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3630 Not doing so is a leap of faith, assuming that the developers |
122
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3631 have avoided obscure programming techniques. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3632 By separating the tools on the program-level, the boundaries are |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3633 clearly visible and technically enforced. |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3634 The interfaces are calls to |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3635 .Fu exec() |
c234656329e0
Wrote about modularization.
markus schnalke <meillo@marmaro.de>
parents:
121
diff
changeset
|
3636 rather than arbitrary function calls. |
123
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3637 .P |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3638 But the real problem is another: |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3639 Nmh violates the golden ``one tool, one job'' rule of the Unix philosophy. |
740f4128dea7
Reworked and extended the text about Modularization.
markus schnalke <meillo@marmaro.de>
parents:
122
diff
changeset
|
3640 Understanding |
122
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Wrote about modularization.
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3641 .Pn comp |
123
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3642 requires understanding |
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3643 .Fn uip/annosbr.c |
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3644 and |
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Reworked and extended the text about Modularization.
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3645 .Fn uip/sendsbr.c |
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3646 because |
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Reworked and extended the text about Modularization.
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3647 .Pn comp |
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3648 does annotate and send messages. |
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3649 In nmh, there surely exists the tool |
122
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3650 .Pn send , |
123
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3651 which does (almost) only send messages. |
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3652 But |
122
c234656329e0
Wrote about modularization.
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3653 .Pn comp |
123
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3654 and |
122
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3655 .Pn repl |
c234656329e0
Wrote about modularization.
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3656 and |
c234656329e0
Wrote about modularization.
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3657 .Pn forw |
c234656329e0
Wrote about modularization.
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3658 and |
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Wrote about modularization.
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3659 .Pn dist |
c234656329e0
Wrote about modularization.
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3660 and |
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Wrote about modularization.
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3661 .Pn whatnow |
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3662 and |
123
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3663 .Pn viamail , |
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3664 they all (!) have the same message sending function included, too. |
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3665 In result, |
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3666 .Pn comp |
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Reworked and extended the text about Modularization.
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3667 sends messages without using |
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Reworked and extended the text about Modularization.
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3668 .Pn send . |
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3669 The situation is the same as if |
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3670 .Pn grep |
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3671 would page without |
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3672 .Pn more |
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3673 just because both programs are part of the same code base. |
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3674 .P |
122
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3675 The clear separation on the surface \(en the toolchest approach \(en |
123
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3676 is violated on the level below. |
122
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3677 This violation is for the sake of time performance. |
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Wrote about modularization.
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|
3678 On systems where |
c234656329e0
Wrote about modularization.
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3679 .Fu fork() |
c234656329e0
Wrote about modularization.
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|
3680 and |
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Wrote about modularization.
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3681 .Fu exec() |
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3682 are expensive, the quicker response might be noticable. |
124 | 3683 In the old times, sacrificing readability and conceptional beauty for |
3684 speed might even have been a must to prevent MH from being unusably slow. | |
122
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Wrote about modularization.
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|
3685 Whatever the reasons had been, today they are gone. |
123
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3686 No longer should we sacrifice readability or conceptional beauty. |
122
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3687 No longer should we violate the Unix philosophy's ``one tool, one job'' |
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3688 guideline. |
123
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3689 No longer should we keep speed improvements that became unnecessary. |
122
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Wrote about modularization.
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3690 .P |
123
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|
3691 Therefore, mmh's |
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Reworked and extended the text about Modularization.
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3692 .Pn comp |
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Reworked and extended the text about Modularization.
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|
3693 does no longer send messages. |
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Reworked and extended the text about Modularization.
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|
3694 In mmh, different jobs are divided among separate programs that |
122
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Wrote about modularization.
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3695 invoke each other as needed. |
123
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3696 In consequence, |
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3697 .Pn comp |
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Reworked and extended the text about Modularization.
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3698 invokes |
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3699 .Pn whatnow |
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Reworked and extended the text about Modularization.
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|
3700 which thereafter invokes |
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3701 .Pn send . |
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3702 The clear separation on the surface is maintained on the level below. |
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3703 Human users and the tools use the same interface \(en |
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3704 annotations, for example, are made by invoking |
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3705 .Pn anno , |
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3706 no matter if requested by programs or by human beings. |
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3707 The decrease of tools built from multiple source files and thus |
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|
3708 the decrease of |
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3709 .Fn uip/*sbr.c |
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|
3710 files confirm the improvement. |
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Reworked and extended the text about Modularization.
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3711 .P |
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|
3712 One disadvantage needs to be taken with this change: |
740f4128dea7
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|
3713 The compiler can no longer check the integrity of the interfaces. |
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3714 By changing the command line interfaces of tools, it is |
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3715 the developer's job to adjust the invocations of these tools as well. |
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|
3716 As this is a manual task and regression tests, which could detect such |
124 | 3717 problems, are not available yet, it is prone to errors. |
123
740f4128dea7
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|
3718 These errors will not be detected at compile time but at run time. |
740f4128dea7
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|
3719 Installing regression tests is a task left to do. |
740f4128dea7
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|
3720 In the best case, a uniform way of invoking tools from other tools |
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|
3721 can be developed to allow automated testing at compile time. |