102 lines
2.9 KiB
Bash
102 lines
2.9 KiB
Bash
#! /bin/sh
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#
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# pic2graph -- compile PIC image descriptions to bitmap images
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#
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# by Eric S. Raymond <esr@thyrsus.com>, July 2002
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# In Unixland, the magic is in knowing what to string together...
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#
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# Take a pic/eqn diagram on stdin, emit cropped bitmap on stdout.
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# The pic markup should *not* be wrapped in .PS/.PE, this script will do that.
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# An -unsafe option on the command line enables gpic/groff "unsafe" mode.
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# A -format FOO option changes the image output format to any format
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# supported by convert(1). An -eqn option changes the eqn delimiters.
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# All other options are passed to convert(1). The default format in PNG.
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#
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# Requires the groff suite and the ImageMagick tools. Both are open source.
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# This code is released to the public domain.
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#
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# Here are the assumptions behind the option processing:
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#
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# 1. Only the -U option of gpic(1) is relevant. -C doesn't matter because
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# we're generating our own .PS/.PE, -[ntcz] are irrelevant because we're
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# generating Postscript.
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#
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# 2. Ditto for groff(1), though it's a longer and more tedious demonstration.
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#
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# 3. Many options of convert(1) are potentially relevant (especially
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# -density, -interlace, -transparency, -border, and -comment).
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#
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# Thus, we pass -U to gpic and groff, and everything else to convert(1).
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#
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# We don't have complete option coverage on eqn because this is primarily
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# intended as a pic translator; we can live with eqn defaults.
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#
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# Id: pic2graph.sh,v 1.7 2005/05/18 07:03:07 wl Exp
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#
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groffpic_opts=""
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gs_opts=""
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convert_opts=""
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format="png"
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eqndelim='$$'
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while [ "$1" ]
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do
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case $1 in
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-unsafe)
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groffpic_opts="-U";;
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-format)
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format=$2
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shift;;
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-eqn)
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eqndelim=$2
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shift;;
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-v | --version)
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echo "GNU pic2graph (groff) version @VERSION@"
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exit 0;;
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--help)
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echo "usage: pic2graph [ option ...] < in > out"
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exit 0;;
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*)
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convert_opts="$convert_opts $1";;
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esac
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shift
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done
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if [ "$eqndelim" ]
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then
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eqndelim="delim $eqndelim"
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fi
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# create temporary directory
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tmp=
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for d in "$GROFF_TMPDIR" "$TMPDIR" "$TMP" "$TEMP" /tmp; do
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test -z "$d" && continue
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tmp=`(umask 077 && mktemp -d -q "$d/pic2graph-XXXXXX") 2> /dev/null` \
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&& test -n "$tmp" && test -d "$tmp" \
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&& break
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tmp=$d/pic2graph$$-$RANDOM
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(umask 077 && mkdir $tmp) 2> /dev/null \
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&& break
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done;
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if test -z "$tmp"; then
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echo "$0: cannot create temporary directory" >&2
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{ (exit 1); exit 1; }
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fi
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trap 'exit_status=$?; rm -rf $tmp && exit $exit_status' 0 2 15
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# Here goes:
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# 1. Wrap the input in dummy .PS/PE macros (and add possibly null .EQ/.EN)
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# 2. Process through eqn and pic to emit troff markup.
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# 3. Process through groff to emit Postscript.
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# 4. Use convert(1) to crop the PostScript and turn it into a bitmap.
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(echo ".EQ"; echo $eqndelim; echo ".EN"; echo ".PS"; cat; echo ".PE") | \
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groff -e -p $groffpic_opts -Tps -P-pletter > $tmp/pic2graph.ps \
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&& convert -trim -crop 0x0 $convert_opts $tmp/pic2graph.ps $tmp/pic2graph.$format \
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&& cat $tmp/pic2graph.$format
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# End
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