#!/bin/bash
# 
# Autor: Julian Forster (www.ProgMaschine.de.vu)
# Autor: markus schnalke (prog.marmaro.de)
#


if [ $# -eq 1 ]; then
  if [ $1 = '--version' ] ; then
    echo 'Buddylistgrapher (shell)'
    echo '========================'
    echo 'version 0.2'
    echo
    echo 'by Julian Forster (http://progmaschine.de.vu)'
    echo 'and Markus Schnalke (http://prog.marmaro.de)'
    exit 0
  elif [ $1 = '--help' ] ; then
    echo 'Buddylistgrapher (shell)'
    echo '========================'
    echo
    echo "usage: $0 <input.txt>"
    echo
    echo "The grapher generates output to stdout."
    echo "This output is the input for the graphviz tools."
    echo
    echo "You can use it like this:"
    echo "$0 input.txt | dot -Tpng > pic.png"
    echo
    echo "ToDo:"
    echo "The program was written for one specific kind of input data,"
    echo "so there is still some work to do to use it for general input."
    exit 0
  else

    file=/tmp/`basename $0`-$$
    file2=/tmp/`basename $0`-$$-2

    # extract all needed lines
    grep -e "Profil von:" -e "Nachricht schreiben" $1 > $file


    # collect all profil names (we only want them as nodes)
    cat $file | while read line ; do
      echo -n "`echo $line | grep "Profil von:" | awk '{print " " $3 " "}'`" >> $file2
    done
    echo >> $file2


    # output
    echo "digraph G {"
    
    cat $file | while read line ; do
      if [ -n "`echo $line | grep "Profil von:"`" ] ; then
        name=$(echo $line |  awk '{ print $3 }')
      else
        buddy=$(echo $line |  awk '{ print $3 }')
        if [ -n "`grep -F " $buddy " $file2`" ] ; then
          echo "  \"$name\" -> \"$buddy\";"
        fi
      fi    
    done

    echo "}"

    rm $file $file2
    exit 0

  fi
else
    echo "usage: $0 <input.txt>"
    exit 1
fi