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Diffstat (limited to 'contrib/pic2graph/pic2graph.sh')
| -rw-r--r-- | contrib/pic2graph/pic2graph.sh | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/contrib/pic2graph/pic2graph.sh b/contrib/pic2graph/pic2graph.sh new file mode 100644 index 00000000..3b15c721 --- /dev/null +++ b/contrib/pic2graph/pic2graph.sh @@ -0,0 +1,111 @@ +#!/bin/sh +# +# pic2graph -- compile PIC image descriptions to bitmap images +# +# by Eric S. Raymond <esr@thyrsus.com>, July 2001 +# +# +# Copyright (C) 2001 Free Software Foundation, Inc. +# +# This file is part of groff. +# +# groff is free software; you can redistribute it and/or modify it under +# the terms of the GNU General Public License as published by the Free +# Software Foundation; either version 2, or (at your option) any later +# version. +# +# groff is distributed in the hope that it will be useful, but WITHOUT ANY +# WARRANTY; without even the implied warranty of MERCHANTABILITY or +# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +# for more details. +# +# You should have received a copy of the GNU General Public License along +# with groff; see the file COPYING. If not, write to the Free Software +# Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + +# In Unixland, the magic is in knowing what to string together... +# +# Take a pic/eqn diagram on stdin, emit cropped bitmap on stdout. +# The pic markup should *not* be wrapped in .PS/.PE, this script will do that. +# A -U option on the command line enables gpic/groff "unsafe" mode. +# All other options are passed to pnmtopng (or whichever back end is selected +# by the format option). The default format in PNG. +# +# Requires groff, ghostscript, and the pnm tools. All are open source. +# Use, modify, and redistribute freely. Send me fixes and enhancements. +# +# Here are the assumptions behind the option processing: +# +# 1. Only the -U option of gpic(1) is relevant. -C doesn't matter because +# we're generating our own .PS/.PE, -[ntcz] are irrelevant because we're +# generating Postscript. +# +# 2. Ditto for groff(1), though it's a longer and more tedious demonstration. +# +# 3. No options of pnmcrop are relevant. We can assume the generated image +# is going to be black-on-white because that's what pic generates. Even +# if pic were somehow coerced into generating a non-white background, +# pnmcrop's algorithm (look at the top corners) will find the right +# thing because gs(1) is generating a full page. +# +# 4. Many options of pnmtopng(1) or other pnm converters are potentially +# relevant, (especially -interlace, -transparent, -background, -text, and +# -compression. +# +# Thus, we pass -U to gpic and groff, and everything else to pnmtopng. +# +# We don't have complete option coverage on eqn because this is primarily +# intended as a pic translator; we can live with eqn defaults. +# +# $Id: pic2graph.sh,v 1.1 2001/08/10 22:16:12 wlemb Exp $ +# +groffpic_opts="" +gs_opts="" +pnmtopng_opts="" +format="png" +resolution="" +eqndelim='$$' + +while [ "$1" ] +do + case $1 in + -unsafe) + groffpic_opts="-U"; pngtopnm_opts="$pngtopnm_opts -U";; + -format) + format=$2; shift;; + -eqn) + eqndelim=$2; shift;; + -resolution) + gs_opts="-r$2"; shift;; + -v | --version) + echo "GNU pic2graph (groff) version @VERSION@" + exit 0;; + --help) + echo "usage: pic2graph [ option ...] < in > out" + exit 0;; + *) + pnmtopmg_opts="$pnmtopmg_opts $1" ;; + esac + shift; +done + +if [ "$eqndelim" ] +then + eqndelim="delim $eqndelim" +fi + +# Here goes: +# 1. Wrap the input in dummy .PS/PE macros +# 2. Process through eqn and pic to emit troff markup +# 3. Process through groff to emit Postscript +# 4. Process through ghostscript to emit a ppm bitmap +# 5. Crop the ppm bitmap +# 6. Turn the ppm into PNG +(echo ".EQ"; echo $eqndelim; echo ".EN"; echo ".PS"; cat; echo ".PE") \ + | groff -e -p $groffpic_opts -Tps \ + | gs -q $gs_opts -sDEVICE='ppmraw' -sOutputFile='-' -dNOPAUSE -dBATCH - \ + | pnmcrop \ + | pnmto${format} $pnmtopng_opts + +# End |