1151497Sru#! /bin/sh 2104862Sru# 3104862Sru# pic2graph -- compile PIC image descriptions to bitmap images 4104862Sru# 5104862Sru# by Eric S. Raymond <esr@thyrsus.com>, July 2002 6104862Sru 7104862Sru# In Unixland, the magic is in knowing what to string together... 8104862Sru# 9104862Sru# Take a pic/eqn diagram on stdin, emit cropped bitmap on stdout. 10104862Sru# The pic markup should *not* be wrapped in .PS/.PE, this script will do that. 11104862Sru# An -unsafe option on the command line enables gpic/groff "unsafe" mode. 12104862Sru# A -format FOO option changes the image output format to any format 13104862Sru# supported by convert(1). An -eqn option changes the eqn delimiters. 14104862Sru# All other options are passed to convert(1). The default format in PNG. 15104862Sru# 16104862Sru# Requires the groff suite and the ImageMagick tools. Both are open source. 17104862Sru# This code is released to the public domain. 18104862Sru# 19104862Sru# Here are the assumptions behind the option processing: 20104862Sru# 21104862Sru# 1. Only the -U option of gpic(1) is relevant. -C doesn't matter because 22104862Sru# we're generating our own .PS/.PE, -[ntcz] are irrelevant because we're 23104862Sru# generating Postscript. 24104862Sru# 25104862Sru# 2. Ditto for groff(1), though it's a longer and more tedious demonstration. 26104862Sru# 27104862Sru# 3. Many options of convert(1) are potentially relevant (especially 28104862Sru# -density, -interlace, -transparency, -border, and -comment). 29104862Sru# 30104862Sru# Thus, we pass -U to gpic and groff, and everything else to convert(1). 31104862Sru# 32104862Sru# We don't have complete option coverage on eqn because this is primarily 33104862Sru# intended as a pic translator; we can live with eqn defaults. 34104862Sru# 35151497Sru# $Id: pic2graph.sh,v 1.7 2005/05/18 07:03:07 wl Exp $ 36104862Sru# 37104862Srugroffpic_opts="" 38104862Srugs_opts="" 39104862Sruconvert_opts="" 40104862Sruformat="png" 41104862Srueqndelim='$$' 42104862Sru 43104862Sruwhile [ "$1" ] 44104862Srudo 45104862Sru case $1 in 46104862Sru -unsafe) 47114402Sru groffpic_opts="-U";; 48104862Sru -format) 49104862Sru format=$2 50104862Sru shift;; 51104862Sru -eqn) 52104862Sru eqndelim=$2 53104862Sru shift;; 54104862Sru -v | --version) 55104862Sru echo "GNU pic2graph (groff) version @VERSION@" 56104862Sru exit 0;; 57104862Sru --help) 58104862Sru echo "usage: pic2graph [ option ...] < in > out" 59104862Sru exit 0;; 60104862Sru *) 61104862Sru convert_opts="$convert_opts $1";; 62104862Sru esac 63104862Sru shift 64104862Srudone 65104862Sru 66104862Sruif [ "$eqndelim" ] 67104862Sruthen 68104862Sru eqndelim="delim $eqndelim" 69104862Srufi 70104862Sru 71151497Sru# create temporary directory 72151497Srutmp= 73151497Srufor d in "$GROFF_TMPDIR" "$TMPDIR" "$TMP" "$TEMP" /tmp; do 74151497Sru test -z "$d" && continue 75151497Sru 76151497Sru tmp=`(umask 077 && mktemp -d -q "$d/pic2graph-XXXXXX") 2> /dev/null` \ 77151497Sru && test -n "$tmp" && test -d "$tmp" \ 78151497Sru && break 79151497Sru 80151497Sru tmp=$d/pic2graph$$-$RANDOM 81151497Sru (umask 077 && mkdir $tmp) 2> /dev/null \ 82151497Sru && break 83151497Srudone; 84151497Sruif test -z "$tmp"; then 85151497Sru echo "$0: cannot create temporary directory" >&2 86151497Sru { (exit 1); exit 1; } 87151497Srufi 88151497Sru 89151497Srutrap 'exit_status=$?; rm -rf $tmp && exit $exit_status' 0 2 15 90151497Sru 91104862Sru# Here goes: 92104862Sru# 1. Wrap the input in dummy .PS/PE macros (and add possibly null .EQ/.EN) 93104862Sru# 2. Process through eqn and pic to emit troff markup. 94104862Sru# 3. Process through groff to emit Postscript. 95104862Sru# 4. Use convert(1) to crop the PostScript and turn it into a bitmap. 96104862Sru(echo ".EQ"; echo $eqndelim; echo ".EN"; echo ".PS"; cat; echo ".PE") | \ 97151497Sru groff -e -p $groffpic_opts -Tps -P-pletter > $tmp/pic2graph.ps \ 98151497Sru && convert -trim -crop 0x0 $convert_opts $tmp/pic2graph.ps $tmp/pic2graph.$format \ 99151497Sru && cat $tmp/pic2graph.$format 100104862Sru 101104862Sru# End 102