Edit File: eqn2graph
#!/bin/sh # # eqn2graph -- compile EQN equation descriptions to bitmap images # # by Eric S. Raymond <esr@thyrsus.com>, July 2002 # # In Unixland, the magic is in knowing what to string together... # # Take an eqn equation on stdin, emit cropped bitmap on stdout. # The pic markup should *not* be wrapped in .EQ/.EN, this script will do that. # A -U option on the command line enables gpic/groff "unsafe" mode. # A -format FOO option changes the image output format to any format # supported by convert(1). All other options are passed to convert(1). # The default format is PNG. # # This is separate from pic2graph because pic processing has some weird # clipping effect on the output, mangling equations that are very wide # or deep. Besides, this tool can supply its own delimiters. # # Requires the groff suite and the ImageMagick tools. Both are open source. # This code is released to the public domain. # # Here are the assumptions behind the option processing: # # 1. None of the options of eqn(1) are relevant. # # 2. Only the -U option of groff(1) is relevant. # # 3. Many options of convert(1) are potentially relevant, (especially # -density, -interlace, -transparency, -border, and -comment). # # Thus, we pass -U to groff(1), and everything else to convert(1). # # $Id: eqn2graph.sh,v 1.2 2002/07/17 04:55:46 wlemb Exp $ # groff_opts="" convert_opts="" format="png" while [ "$1" ] do case $1 in -unsafe) groff_opts="-U";; -format) format=$2 shift;; -v | --version) echo "GNU eqn2graph (groff) version 1.18.1.4" exit 0;; --help) echo "usage: eqn2graph [ option ...] < in > out" exit 0;; *) convert_opts="$convert_opts $1";; esac shift done # Here goes: # 1. Add .EQ/.EN. # 2. Process through eqn(1) to emit troff markup. # 3. Process through groff(1) to emit Postscript. # 4. Use convert(1) to crop the Postscript and turn it into a bitmap. tmpps=`mktemp /tmp/eqn2graph-XXXXXXXX.ps` tmpfmt=`mktemp /tmp/eqn2graph-XXXXXXXX.$format` trap "rm $tmpps $tmpfmt" 0 2 15 read equation (echo ".EQ"; echo 'delim $$'; echo ".EN"; echo '$'"${equation}"'$') | \ groff -e $groff_opts -Tps >$tmpps \ && convert -crop 0x0 $convert_opts $tmpps $tmpfmt \ && cat $tmpfmt # End
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