75 lines
2.1 KiB
Bash
75 lines
2.1 KiB
Bash
#!/bin/sh
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#
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# eqn2graph -- compile EQN equation 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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#
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# In Unixland, the magic is in knowing what to string together...
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#
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# Take an eqn equation on stdin, emit cropped bitmap on stdout.
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# The pic markup should *not* be wrapped in .EQ/.EN, this script will do that.
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# A -U 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). All other options are passed to convert(1).
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# The default format is PNG.
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#
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# This is separate from pic2graph because pic processing has some weird
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# clipping effect on the output, mangling equations that are very wide
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# or deep. Besides, this tool can supply its own delimiters.
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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. None of the options of eqn(1) are relevant.
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#
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# 2. Only the -U option of groff(1) is relevant.
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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 groff(1), and everything else to convert(1).
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#
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# Id: eqn2graph.sh,v 1.2 2002/07/17 04:55:46 wlemb Exp
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#
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groff_opts=""
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convert_opts=""
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format="png"
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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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groff_opts="-U";;
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-format)
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format=$2
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shift;;
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-v | --version)
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echo "GNU eqn2graph (groff) version @VERSION@"
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exit 0;;
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--help)
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echo "usage: eqn2graph [ option ...] < in > out"
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exit 0;;
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*)
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convert_opts="$convert_opts $1";;
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esac
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shift
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done
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# Here goes:
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# 1. Add .EQ/.EN.
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# 2. Process through eqn(1) to emit troff markup.
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# 3. Process through groff(1) 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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tmp=/usr/tmp/eqn2graph-$$
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trap "rm ${tmp}.*" 0 2 15
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read equation
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(echo ".EQ"; echo 'delim $$'; echo ".EN"; echo '$'"${equation}"'$') | \
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groff -e $groff_opts -Tps >${tmp}.ps \
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&& convert -crop 0x0 $convert_opts ${tmp}.ps ${tmp}.${format} \
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&& cat ${tmp}.${format}
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# End
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