#!/bin/bash
# fax backend to drive efax similar to Apple's own. Ours does also some
# kind of basic locking, and stores the sent faxes somewhere... 
# 
# When we're called without arguments, we simply exit (fax.orig will
# report the available devices) and if we're called to transmit a fax
# we will redirect the output into a logfile additionally and store
# the document to be transmitted in subfolders of the Fax subsystem's
# 'SavePath' -- usually /Users/Shared/Faxes --, too.

Main()
{
	# Read efax preferences
	. /etc/efax.rc
	
	# Look what's going on
	
	case $# in
	0)
		echo "serial fax \"Unknown\" \"Fax Printer (fax)\""
		echo "serial fax://dev/${DEV} \"Unknown\" \"modem\""
		exit 0
		;;
	5)
		FaxFile="${TMPDIR:=/tmp}/`date +%s`-$$"
		while [ -e "${FaxFile}" ]; do
			FaxFile="${FaxFile}X"
		done
		cat >"${FaxFile}"
		;;
	6)
		FaxFile="$6"
		;;
	esac
	
	PATH=${PATH}:/usr/bin:/usr/sbin:
	export PATH
	
	# Collect some informations about the job (for Logging and storing the
	# fax with an appropriate filename)
	
	eval ParseCUPSOptions $5
	
	Device2Use=`echo ${DEVICE_URI} | awk -F'://' '{print $2}'`
	Subject="$3"
	
	Number2Dial="`echo ${FAX_phone} | perl -ple 's/%([0-9A-Fa-f]{2})/chr(hex($1))/eg' 2>/dev/null`" 
	echo "${FAX_Resolution}" | grep -q "196"
	case $? in
	0)
		Resolution="High Resolution" ;;
	1)
		Resolution="Low Resolution" ;;
	esac
	if [ -n "${FAX_faxSubject}" ]; then
		Subject="`echo "${FAX_faxSubject}" | perl -ple 's/%([0-9A-Fa-f]{2})/chr(hex($1))/eg' 2>/dev/null`"
	fi
			
	FaxName="`printf %05s "$1"` - `echo "${FAX_faxTo} (${Subject})" | tr "\/" "\:"`"
	
	# Store the fax in an appropriate place
	
	SavePath="`defaults read /Library/Preferences/com.apple.print.FaxPrefs SavePath`"
	if [ ! -d "${SavePath}" ]; then
		echo "WARNING: Couldn't save the Fax. Please specify a target folder in PrintCenter" >&2
	else
		for Folder in Failed Sent ; do
			if [ ! -d "${SavePath}/${Folder}" ]; then
				mkdir -m777 "${SavePath}/${Folder}"
			fi
		done
		FaxTargetFile="${SavePath}/Sent/${FaxName}.tif"
		cp "${FaxFile}" "${FaxTargetFile}"
		chown 99:99 "${FaxTargetFile}"
		chmod 666 "${FaxTargetFile}"
	fi
	
	# Start to log into /var/log/fax/de.kaiser-edv.sent.log and
	# /var/log/fax/de.kaiser-edv.additional.log
	
	if [ ! -d /var/log/fax/ ]; then
		mkdir -m 755 /var/log/fax/
	fi
	
	# Calling efax
	
	Device2Use=`echo ${DEVICE_URI} | awk -F'://' '{print $2}'`
	OurNumber=`defaults read /Library/Preferences/com.apple.print.FaxPrefs FaxNumber`
	
	echo "efax sending to ${Number2Dial}" >&2
	efax -d${Device2Use} ${LOCK} -vewincf -iZ -i "E0&D2S7=120&C0M1X4" -oh -l "${OurNumber}" -t "${DIALPREFIX}${Number2Dial}" "${FaxFile}"
	Status=$?
	echo "Exit Code: ${Status}" >&2
	
	if [ ${Status} -ne 0 ]; then
		if [ -f "${FaxTargetFile}" ]; then
			/bin/mv "${FaxTargetFile}" "${SavePath}/Failed"
		fi
	fi
	/bin/rm "${FaxFile}"
}

ParseCUPSOptions()
{
	# We parse the CUPS options, delete occurences of "com.apple.print" in
	# their names, preprend the variable names with "CUPS_", define
	# them as variables and export them
	# If you want to use these variables in an folderaction script then
	# use set to have a look what vars are exported and what values they 
	# have

	i="com\.apple\.print\."
        while [ $# -ge 1 ]; do
		VarName=`echo $1 | cut -d"=" -f1 | sed "s|^$i||g;s|\.[nb]\.$||g;s|\.||g"`
		VarValue=`echo $1 | cut -d"=" -f2 | sed "s|\ |\\\\\ |g"`
		eval FAX_${VarName}=${VarValue}
		eval export CUPS_${VarName}
                shift
        done
}

Main "$@"