contrib/grap2graph/grap2graph.sh

   1 #! /bin/sh
   2 #
   3 # grap2graph -- compile graph description descriptions to bitmap images
   4 #
   5 # by Eric S. Raymond <esr@thyrsus.com>, May 2003
   6 #
   7 # In Unixland, the magic is in knowing what to string together...
   8 #
   9 # Take grap description on stdin, emit cropped bitmap on stdout.
  10 # The pic markup should *not* be wrapped in .G1/.G2, this script will do that.
  11 # A -U option on the command line enables gpic/groff "unsafe" mode.
  12 # A -format FOO option changes the image output format to any format
  13 # supported by convert(1).  All other options are passed to convert(1).
  14 # The default format is PNG.
  15 #
  16
  17 # Requires the groff suite and the ImageMagick tools.  Both are open source.
  18 # This code is released to the public domain.
  19 #
  20 # Here are the assumptions behind the option processing:
  21 #
  22 # 1. None of the options of grap(1) are relevant.
  23 #
  24 # 2. Only the -U option of groff(1) is relevant.
  25 #
  26 # 3. Many options of convert(1) are potentially relevant, (especially
  27 # -density, -interlace, -transparency, -border, and -comment).
  28 #
  29 # Thus, we pass -U to groff(1), and everything else to convert(1).
  30 #
  31 # $Id$
  32 #
  33 groff_opts=""
  34 convert_opts=""
  35 format="png"
  36
  37 while [ "$1" ]
  38 do
  39     case $1 in
  40     -unsafe)
  41         groff_opts="-U";;
  42     -format)
  43         format=$2
  44         shift;;
  45     -v | --version)
  46         echo "GNU grap2graph (groff) version @VERSION@"
  47         exit 0;;
  48     --help)
  49         echo "usage: grap2graph [ option ...] < in > out"
  50         exit 0;;
  51     *)
  52         convert_opts="$convert_opts $1";;
  53     esac
  54     shift
  55 done
  56
  57 # create temporary directory
  58 tmp=
  59 for d in "$GROFF_TMPDIR" "$TMPDIR" "$TMP" "$TEMP" /tmp; do
  60     test -z "$d" && continue
  61
  62     tmp=`(umask 077 && mktemp -d -q "$d/grap2graph-XXXXXX") 2> /dev/null` \
  63     && test -n "$tmp" && test -d "$tmp" \
  64     && break
  65
  66     tmp=$d/grap2graph$$-$RANDOM
  67     (umask 077 && mkdir $tmp) 2> /dev/null && break
  68 done;
  69 if test -z "$tmp"; then
  70     echo "$0: cannot create temporary directory" >&2
  71     { (exit 1); exit 1; }
  72 fi
  73
  74 trap 'exit_status=$?; rm -rf $tmp && exit $exit_status' 0 2 15
  75
  76 # Here goes:
  77 # 1. Add .G1/.G2.
  78 # 2. Process through grap(1) to emit pic markup.
  79 # 3. Process through groff(1) with pic preprocessing to emit Postscript.
  80 # 4. Use convert(1) to crop the Postscript and turn it into a bitmap.
  81 (echo ".G1"; cat; echo ".G2") | grap | groff -p $groff_opts -Tps -P-pletter | \
  82     convert -trim -crop 0x0 $convert_opts - $tmp/grap2graph.$format \
  83     && cat $tmp/grap2graph.$format
  84
  85 # End