print filter for lpr
bill h
bill.h at angelfire.com
Fri Apr 20 10:22:30 EDT 2001
this is my printfilter file: what do i need to look at?---
#!/bin/bash
#
#
# New smart print filter
#
#
# determines input file magic
#
# looks in the default filter plugin (FPI) directory
# finds all *.fpi files, then finds a combination that will
# yield the desired file type, or will indicate this is impossible.
#
function filtfrom {
echo -ne ${1%-to-*}
}
function filtto {
echo -ne ${1#*-to-}
}
#
# given filters as input vars, find next level available given the
# first arg is the starting point
#
function nextlvl {
local try
local start
local all
local depth
#
#
# $1 is starting point, find something that will work
#
start="$1"
shift
depth="$1"
shift
all="$@"
#
# get out of here if too deep!
#
if [ $depth -ge $MAX_DEPTH ]; then
return 1
fi
if [ $DEBUG_TREE ]; then
echo "Starting point = $start" >> /tmp/filter.debug
fi
if [ $(filtto $start) = $DESIRED_TO ]; then
echo " DONE"
return 0
fi
while [ $1 ]; do
try=$1
shift
if [ $DEBUG_TREE ]; then
echo "for $start trying $try" >> /tmp/filter.debug
fi
if [ $(filtfrom $try) = $(filtto $start) ]; then
echo -n "$start.fpi:$depth:CONT "
if [ $(filtto $try) = $DESIRED_TO ]; then
echo -n "$try.fpi:$((depth+1)):DONE "
return 0
else
# echo -n $try
nextlvl $try $((depth+1)) $all
# echo "|G is $G| "
if [ $DEBUG_TREE ]; then
echo "|rt is $?|" >> /tmp/filter.debug
fi
if [ "$?" = "0" ]
then
if [ $DEBUG_TREE ]; then
echo "for $start we are done" >> /tmp/filter.debug
fi
# return 0
else
if [ $DEBUG_TREE ]; then
echo "for $start we have failed" >> /tmp/filter.debug
fi
return 1
fi
fi
fi
# echo ""
done
}
#
# MAIN
#
#
#
#
# setup some global variables used by this script
#
#
#
# FPIDIR points to where print filter plug-ins are stored
# Normally these will be installed with a package via RPM
#
FPIDIR=/usr/lib/rhs/rhs-printfilters/
PATH=${FPIDIR}:${PATH}
#
# MAX_DEPTH determines how long a string of filters will be
# tried as a possible printing solution. How many input
# formats will take 6 filters to output Postscript!
# Unlikely this will need to be changed.
#
MAX_DEPTH=6
#
# define these to gets lots of feedback
# output is appended on /tmp/filter.debug
#
DEBUG_TREE=""
DEBUG_FILTER=""
#
# Setup variables available to all filter plug-ins
#
#
#
# SPOOLDIR is directory which lpd is spooling from
#
export SPOOLDIR=$(pwd)
#
# Get queue specific information (which was written by printtool)
#
source ${SPOOLDIR}/general.cfg
if [ "$DEBUG_FILTER" != "" ]; then
echo "Desired print format is $DESIRED_TO" >> /tmp/filter.debug
echo "Paper size is $PAPERSIZE" >> /tmp/filter.debug
echo -n "A form feed will " >> /tmp/filter.debug
if [ "$SEND_EOF" = "" ]; then
echo "not be sent." >> /tmp/filter.debug
else
echo "be sent." >> /tmp/filter.debug
fi
fi
cd $FPIDIR
fpis=$(ls *.fpi 2> /dev/null | tr '\n' ' ' | sed 's/\.fpi//g')
#
# let's see if its a compressed file first
#
#
# Figure out the magic of the input file
#
magic=$(file -)
magic=${magic#*: }
case `echo $magic | tr 'A-Z' 'a-z'` in
*packed*|*gzip*|*compress* )
$FPIDIR/rewindstdin
DECOMPRESS="gzip -dc"
magic=$($DECOMPRESS - | file -)
magic=${magic#*: }
;;
* )
DECOMPRESS="";;
esac
$FPIDIR/rewindstdin
magic=${magic#*: }
if [ "$DEBUG_FILTER" != "" ]; then
echo "Magic is |$magic|" >> /tmp/filter.debug
fi
case `echo $magic | tr 'A-Z' 'a-z'` in
*empty* )
exit;;
"pc bitmap data"* )
startpnt="INPUT-to-bmp";;
"gif image data"* )
startpnt="INPUT-to-gif";;
"jpeg image data"* )
startpnt="INPUT-to-jpeg";;
"tiff image data"* )
startpnt="INPUT-to-tiff";;
"sun raster image data"* )
startpnt="INPUT-to-rast";;
"pgm"*|"pbm"*|"ppm"* )
startpnt="INPUT-to-pnm";;
postscript* )
startpnt="INPUT-to-ps";;
"tex dvi file"* )
startpnt="INPUT-to-dvi";;
"fig image text"* )
startpnt="INPUT-to-fig";;
# troff is safe again with groff-1.11a or later we hope
"troff or preprocessor"* )
startpnt="INPUT-to-troff";;
"rpm"* )
startpnt="INPUT-to-rpm";;
*ascii*|*text*|*english*|*script* )
startpnt="INPUT-to-asc";;
*data*|*escape* )
startpnt="INPUT-to-prdata";;
*pcl* )
startpnt="INPUT-to-prdata";;
* )
startpnt="INPUT-to-unknown";;
esac
#
# here is where we could put in hook to call user routine(s) to
# handle extra magics they've defined filters for
#
# call_user_magic_hook()
#
if [ "$DEBUG_FILTER" != "" ]; then
echo "Type of file is $startpnt" >> /tmp/filter.debug
fi
if [ "$startpnt" = "Dont know" ]; then
echo "Error - input file type is unknown - cannot print"
exit 1
fi
#
# catch some easy cases without having to figure out best path the hard way
#
bestpath=""
foundbest="NO"
if [ $(filtto $startpnt) = "asc" ]; then
if [ "$ASCII_TO_PS" = "NO" ]; then
bestpath="$startpnt | asc-to-printer.fpi"
foundbest="YES"
fi
elif [ $(filtto $startpnt) = "prdata" ]; then
bestpath="$startpnt | cat -"
foundbest="YES"
elif [ $(filtto $startpnt) = $DESIRED_TO ]; then
bestpath="$startpnt | $DESIRED_TO-to-printer.fpi"
foundbest="YES"
fi
if [ "$foundbest" != "YES" ]; then
#
# we go through and find best path
#
G=`nextlvl "$startpnt" "0" $fpis`
if [ "$DEBUG_FILTER" != "" ]; then
echo "$G" >> /tmp/filter.debug
fi
#
# now sort out the best path of all available
#
#
# if no processing required, depth will equal 'DONE'
#
if [ "${G# *}" != "DONE" ]; then
root=""
bestdepth=$((MAX_DEPTH*2))
bestpath=""
curdepth="0"
depth="0"
foundbest="NO"
for i in $G; do
entry=${i%%:*}
depth=${i#*:}
depth=${depth%:*}
if [ $depth -le $curdepth ]; then
while [ $(($depth <= $curdepth && $curdepth >= 0)) -eq 1 ]; do
root=${root%* | *}
curdepth=$(($curdepth - 1))
done
fi
if [ $(($curdepth < 0)) -eq 1 ]; then
root=""
fi
curdepth=$depth
if [ "$root" = "" ]; then
root="$entry"
else
root="$root | $entry"
fi
if [ ${i##*:} = "DONE" ]; then
if [ "$DEBUG_FILTER" != "" ]; then
echo "$root -> depth = $depth" >> /tmp/filter.debug
fi
if [ $depth -lt $bestdepth ]; then
foundbest="YES"
bestdepth=$depth
bestpath=$root
fi
fi
done
fi
if [ "$foundbest" = "YES" ]; then
bestpath="$bestpath | $DESIRED_TO-to-printer.fpi"
fi
#
# end of doing it the hard way
#
fi
#
# we have to add filter to convert desired format to something the
# printer can handle. May be as simple as 'cat'
#
#
# ok we got here, and if input data magic is 'data' we'll let it
# through, hoping it really will work on the printer!
# Note we still reject lots of magics, like ELF, by doing this
# which is what we want
#
#
# getting bad, but trapping all "special" cases here
#
#
if [ "$foundbest" = "NO" ]; then
printf "No way to print this type of input file: $magic \014"
exit 0
else
#
# fix up the best path so we can run it
#
if [ "$DECOMPRESS" = "" ]; then
bestpath="cat - ${bestpath#* }"
else
bestpath="$DECOMPRESS ${bestpath#* }"
fi
fi
#
# any post-filter to run (like smbclient?)
#
if [ "$PRINTER_TYPE" = "SMB" ]; then
bestpath="$bestpath | ${FPIDIR}/smbprint ${SPOOLDIR}/acct"
elif [ "$PRINTER_TYPE" = "NCP" ]; then
bestpath="$bestpath | ${FPIDIR}/ncpprint ${SPOOLDIR}/acct"
elif [ "$PRINTER_TYPE" = "DIRECT" ]; then
bestpath="$bestpath | ${FPIDIR}/directprint ${SPOOLDIR}/acct"
fi
if [ "$DEBUG_FILTER" != "" ]; then
echo "Best path of depth $bestdepth is $bestpath" >> /tmp/filter.debug
fi
#
# run the command!
#
eval $bestpath 2>/dev/null
#
#
# see if we need to send a form feed to eject the page from printer
#
# if [ "$SEND_EOF" != "" ]; then
# printf "\014"
# fi
exit 0
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