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/usr/bin/grap2graph is in groff 1.22.2-8.

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The actual contents of the file can be viewed below.

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#! /bin/bash
#
# grap2graph -- compile graph description descriptions to bitmap images
#
# by Eric S. Raymond <esr@thyrsus.com>, May 2003
#
# In Unixland, the magic is in knowing what to string together...
#
# Take grap description on stdin, emit cropped bitmap on stdout.
# The pic markup should *not* be wrapped in .G1/.G2, 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.
#

# 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 grap(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: grap2graph.sh,v 1.5 2010/02/25 20:17:13 wl Exp $
#
groff_opts=""
convert_opts=""
format="png"

while [ "$1" ]
do
    case $1 in
    -unsafe)
	groff_opts="-U";;
    -format)
	format=$2
	shift;;
    -v | --version)
	echo "GNU grap2graph (groff) version 1.22.2"
	exit 0;;
    --help)
	echo "usage: grap2graph [ option ...] < in > out"
	exit 0;;
    *)
	convert_opts="$convert_opts $1";;
    esac
    shift
done

# create temporary directory
tmp=
for d in "$GROFF_TMPDIR" "$TMPDIR" "$TMP" "$TEMP" /tmp; do
    test -z "$d" && continue

    tmp=`(umask 077 && mktemp -d -q "$d/grap2graph-XXXXXX") 2> /dev/null` \
    && test -n "$tmp" && test -d "$tmp" \
    && break

    tmp=$d/grap2graph$$-$RANDOM
    (umask 077 && mkdir $tmp) 2> /dev/null && break
done;
if test -z "$tmp"; then
    echo "$0: cannot create temporary directory" >&2
    { (exit 1); exit 1; }
fi

trap 'exit_status=$?; rm -rf $tmp && exit $exit_status' EXIT INT TERM

# Here goes:
# 1. Add .G1/.G2.
# 2. Process through grap(1) to emit pic markup.
# 3. Process through groff(1) with pic preprocessing to emit Postscript.
# 4. Use convert(1) to crop the Postscript and turn it into a bitmap.
(echo ".G1"; cat; echo ".G2") | grap | groff -p $groff_opts -Tps -P-pletter | \
    convert -trim -crop 0x0 $convert_opts - $tmp/grap2graph.$format \
    && cat $tmp/grap2graph.$format

# End