#!/bin/sh

#
# ghostscript filter
#   written by Hidenori Ishikawa
#
# $Id: lpfilter,v 1.6 2002/06/11 19:39:35 hideishi Exp $
#

PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin

# config settings file *REQUIRED*
CONFIG=`dirname $0`/lp.cfg

# path to GhostScript
GS=/usr/local/bin/gs

# defaults
SPOOL=/var/spool/output/lpd/lp
GSDEVICE=lips4
RESOLUTION=600x600
COLOR=-dBitsPerPixel=1
PAPERSIZE=a4
EXTRA_GS_OPTIONS=
PS_SEND_EOF=NO
GSPREPROCESS=
GSPOSTPROCESS=

# functions
exit_post_magic() {
	echo "SPOOL empty or invalid to process."
	# clean out spool file
	rm -f ${SPOOLFILE}
	exit 1
}


# load settings from configfile
. ${CONFIG}

# first check about file magics
TEMPNAME=`basename $0`
SPOOLFILE=`mktemp -q ${SPOOL}/${TEMPNAME}.XXXXXX` || exit
cat - > ${SPOOLFILE}
MAGIC=`file ${SPOOLFILE} | tr 'A-Z' 'a-z'`
MAGIC=${MAGIC#*: }

# decompression routines
case ${MAGIC} in
*packed*|*gzip*)
	DECOMPRESS="| gzip -dc"
	MAGIC=`cat ${SPOOLFILE} ${DECOMPRESS} | file - | tr 'A-Z' 'a-z'`
	MAGIC=${MAGIC#*: }
	;;
*bzip2*)
	DECOMPRESS="| bzip2 -dc"
	MAGIC=`cat ${SPOOLFILE} ${DECOMPRESS} | file - | tr 'A-Z' 'a-z'`
	MAGIC=${MAGIC#*: }
	;;
*)
	DECOMPRESS=
	;;
esac

# extra filters
case ${MAGIC} in
*empty*)	
	exit_post_magic
	;;
"pc bitmap data"*)
	FILTER="| bmptopnm | pnmtops"
	;;
"gif image data"*)
	FILTER="| giftopnm | pnmtops"
	;;
"jpeg image data"*)
	FILTER="| djpeg | pnmtops"
	;;
"tiff image data"*)
	FILTER="| tifftopnm | pnmtops"
	;;
"sun raster image data"*)
	FILTER="| rasttopnm | pnmtops"
	;;
pgm*|pbm*|ppm*)
	FILTER="| pnmtops"
	;;
png*)
	FILTER="| pngtopnm | pnmtops"
	;;
postscript*)
	FILTER=
	;;
"troff or preprocessor"*)
	FILTER="| grog -Tps -msafer -"
	;;
"iso-8859 text"*)
	FILTER="| a2ps-j -nh -ns -nt -p"
	;;
*ascii*|*text*|*english*|*script*)
	FILTER="| a2ps -q -1 -B --footer='%s./%s#' --borders=no"
	;;
*data*|*escape*|*pcl*)
	FILTER=
	;;
*)
	exit_post_magic
	;;
esac

# ghostscript settings
if [ x"${GSDEVICE}" = "xPOSTSCRIPT" ]; then
	GSCMD=
else
	GSCMD="| ${GS} -q -dNOPAUSE -dSAFER -dBATCH \
		-r${RESOLUTION} \
		-sDEVICE=${GSDEVICE} \
		-sPAPERSIZE=${PAPERSIZE} \
		-sOutputFile=- \
		${COLOR} \
		${EXTRA_GS_OPTIONS} \
		- quit.ps"
fi

# finally, do everything
eval "${GSPREPROCESS}"
eval "cat ${SPOOLFILE} ${DECOMPRESS} ${FILTER} ${GSCMD}" 2> /dev/null
eval "${GSPOSTPROCESS}"

# see if we need to send a form feed to eject the page from printer
if [ x"${PS_SEND_EOF}" = "xYES" ]; then
	printf '\004'
fi

# clean out spool file
rm -f ${SPOOLFILE}

exit 0