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


if [ $# -eq 1 ]; then
  if [ $1 = '--version' ] ; then
    echo 'Buddylistgrapher (sed)'
    echo '======================'
    echo 'version 0.1'
    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 (sed)'
    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


    # sed
    sed -n -e " 
      /^Profil/{
        s/Profil von: \(.\+\)/\"\1\";/
        w $file
        s/;$//
        h
        #p
      }


      /^Nachricht/{
        G
        s/ - [-0-9]\+//
        s/Nachricht schreiben \(.\+\)\n/\"\1\" /
        s/\"\(.\+\)\" \"\(.\+\)\"/  \"\2\" -> \"\1\";/

        # write out
        #p
        w $file2
      }
    " $1

    # output
    echo "digraph G {"
    grep -f $file $file2
    echo "}"

    # cleanup
    rm $file $file2
    exit 0

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