#!/bin/bash

# epscrop -- crop EPS files using ghostscript
# Copyright (C) 2002,  Maarten Ditzel
#
# This program 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
# of the License, or (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

# process arguments
infile=$1
if [ "$1" == "-h" ]; then
    echo "synopsis:     epscrop <file>"
    echo "author:       Maarten Ditzel (February 2002)"
    echo "description:  adjusts the bounding box of <file> to fit"
    exit 1
fi

if (( $# < 1 )); then
    echo "no input file specified"
    exit 2
fi

# create a temporary directory
tmpdir=/tmp/epscrop-$$
mkdir $tmpdir

# check ghostscript version (both GNU and Aladdin should work)
gstype=`gs -v | awk '/^GNU|AFPL/ { print $1; }'`
version=`gs -v | awk '/^GNU|AFPL/ { print $3; }'`
major=`echo $version | awk -F "." '{ print $1; }'`
minor=`echo $version | awk -F "." '{ print $2; }'`

if [[ (( $major > 5 )) &&  (( $minor > 50 )) ]]; then
    # retrieve the bounding box
    gs -dNOPAUSE -sDEVICE=bbox -q $infile quit.ps 2> $tmpdir/bbox 
else
    # bbox device doesn't seem to work for previous versions
    # thus we use epswrite to find the bounding box
    # Q: why don't we use epswrite all the time ? 
    # A: it returns a poor quality eps
    # Q: why don't we use the psbb program ?
    # A: only returns the boundingbox already specified in the file
    #    and the whole point is to replace it with a cropped version

    gs -dNOPAUSE -sDEVICE=epswrite -sOutputFile=$tmpdir/bbox.eps -q $infile quit.ps
    grep BoundingBox $tmpdir/bbox.eps > $tmpdir/bbox
    
fi

# get the cropped bounding box
bbox=`awk '/^%%BoundingBox:/ { print  $2,$3,$4,$5; }' $tmpdir/bbox`

# create awk script
cat <<EOF > $tmpdir/epscrop.awk

# created by epscrop

BEGIN {
    bbdone = 0;
}

/^%%BoundingBox/ { 
    if (!bbdone) {
	print \$1, bbox;
	bbdone = 1;
    }
    else
	print;
}

!/^%%BoundingBox/ {
    print;
}

EOF

# adjust bounding box
awk -v bbox="$bbox" -f $tmpdir/epscrop.awk $infile

# remove the temporary directory
rm -r $tmpdir