3 # grap2graph -- compile graph description descriptions to bitmap images
5 # by Eric S. Raymond <esr@thyrsus.com>, May 2003
7 # In Unixland, the magic is in knowing what to string together...
9 # Take grap description on stdin, emit cropped bitmap on stdout.
10 # The grap 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.
17 # Requires the groff suite and the ImageMagick tools. Both are open source.
18 # This code is released to the public domain.
20 # Here are the assumptions behind the option processing:
22 # 1. None of the options of grap(1) are relevant.
24 # 2. Only the -U option of groff(1) is relevant.
26 # 3. Many options of convert(1) are potentially relevant, (especially
27 # -density, -interlace, -transparency, -border, and -comment).
29 # Thus, we pass -U to groff(1), and everything else to convert(1).
33 convert_trim_arg="-trim"
45 echo "GNU grap2graph (groff) version @VERSION@"
48 echo "usage: grap2graph [ option ...] < in > out"
51 convert_opts="$convert_opts $1";;
56 # create temporary directory
58 for d in "$GROFF_TMPDIR" "$TMPDIR" "$TMP" "$TEMP" /tmp
65 echo "$0: error: temporary directory \"$d\" does not exist or is" \
70 if ! tmp=`(umask 077 && mktemp -d -q "$d/grap2graph-XXXXXX") 2> /dev/null`
72 # mktemp failed--not installed or is a version that doesn't support those
73 # flags? Fall back to older method which uses more predictable naming.
75 # $RANDOM is a Bashism. The fallback of $PPID is not good pseudorandomness,
76 # but is supported by the stripped-down dash shell, for instance.
77 tmp="$d/grap2graph$$-${RANDOM:-$PPID}"
78 (umask 077 && mkdir "$tmp") 2> /dev/null
83 echo "$0: error: cannot create temporary directory \"$tmp\"" >&2
87 # See if the installed version of convert(1) is new enough to support the -trim
88 # option. Versions that didn't were described as "old" as early as 2008.
89 is_convert_recent=`convert -help | grep -e -trim`
90 if test -z "$is_convert_recent"
92 echo "$0: warning: falling back to old '-crop 0x0' trim method" >&2
93 convert_trim_arg="-crop 0x0"
96 trap 'exit_status=$?; rm -rf "$tmp" && exit $exit_status' EXIT INT TERM
100 # 2. Process through grap(1) to emit pic markup.
101 # 3. Process through groff(1) with pic preprocessing to emit Postscript.
102 # 4. Use convert(1) to crop the Postscript and turn it into a bitmap.
103 (echo ".G1"; cat; echo ".G2") | grap | groff -p $groff_opts -Tps -P-pletter | \
104 convert -trim $convert_opts - "$tmp"/grap2graph.$format \
105 && cat "$tmp"/grap2graph.$format