#!/bin/bash
#cue2tracks

OPTSTRING=c:i:o:h
while getopts ${OPTSTRING} NAME; do
	case ${NAME} in 
		h) echo "usage: cue2tracks -c <cuefile> -i <input format> -o <output format> | -h" ;;
		c) CUE=${OPTARG} ;;
		i) INFORMAT=${OPTARG} ;;
		o) OUTFORMAT=${OPTARG} ;;
	esac
done


case ${INFORMAT} in 
	mp3) which lame &>/dev/null || (echo lame required to decode mp3 files, exiting; exit 50) ;;
	ogg) which oggdec &>/dev/null || (echo oggdec required to decode ogg files, exiting; exit 51) ;;
	wav) : ;;
	ape) which mac &>/dev/null || (echo mac required to decode ape files, exiting; exit 52) ;;
	mpc) which mppdec &>/dev/null || (echo mppdec required to decode mpc files, exiting; exit 53) ;;
	flac) which flac &>/dev/null || (echo flac required to decode flac files, exiting; exit 54) ;; 
	*) echo "cue2tracks can't handle this input format"; exit 60 ;; 
esac
case ${OUTFORMAT} in 
	mp3) which lame &>/dev/null || (echo lame required to encode mp3 files, exiting; exit 55) ;;
	ogg) which oggenc &>/dev/null || (echo oggenc required to encode ogg files, exiting; exit 56) ;;
	wav) : ;;
	ape) which mac &>/dev/null || (echo mac required to encode ape files, exiting; exit 57) ;;
	mpc) which mppenc &>/dev/null || (echo mppenc required to encode mpc files, exiting; exit 58) ;;
	flac) which flac &>/dev/null || (echo flac required to encode flac files, exiting; exit 59) ;; 
	*) echo "cue2tracks can't handle this output format"; exit 61 ;; 
esac

[ -e "${CUE}" ] || (echo "cue2tracks can't find ${CUE}", exit 62)
INFILE="${CUE%cue}${INFORMAT}"; [ -e "${INFILE}" ] || (echo "cue2tracks can't find ${INFILE}"; exit 63)

which sox &>/dev/null || (echo sox is required  by cue2tracks, exiting; exit 64)


gettracksnames() {
	n=1
	while read TRACK; do 
		eval TRACK${n}=\"$(printf "%02d - ${TRACK}" $n)\"
		((n++))
	done <<<"$(awk -F'"' '/ TITLE/{print $2}' "${CUE}")"
	NUMBER=$((n-1)); BNUMBER=$n
}

gettracksnames


gettrackslengths() {
	n=1; 
	while read TIME; do 
		set ${TIME//:/ }
		case $# in 
			3) eval OFFSET${n}=$(((60*10#$1)+10#$2))${3/$'\r'} ;; 
			4) eval OFFSET${n}=$(((3600*10#$1)+(60*10#$2)+10#$3))${4/$'\r'} ;;
		esac
		((n++))
	done <<<"$(awk '/INDEX 01/{print $3}' "${CUE}")"
}

gettrackslengths


towav() {
	TMPWAV="${INFILE%${INFORMAT}}"wav
	erase=1
	case ${INFORMAT} in
		wav) erase=0 ;;
		mp3) lame --decode "${INFILE}" "${TMPWAV}" ;;
		ogg) oggdec "${INFILE}" -o "${TMPWAV}" ;;
		ape) mac "${INFILE}" "${TMPWAV}" -d ;;
		mpc) mppdec "${INFILE}" "${TMPWAV}" ;;
		flac) flac -d "${INFILE}" ;;
	esac
}

towav

gettotallength() {
	LENGTH=$(sox "${TMPWAV}" -e stat 2>&1 | awk '/Length/{print $3}')
	set ${LENGTH/./ }
	eval OFFSET$BNUMBER="${1}${2:0:2}"
}

gettotallength


splitandconvert() {
	for ((n=1,m=2;n<=NUMBER;n++,m++)); do
		eval debut=\${OFFSET$n}
		eval fin=\${OFFSET$m}
		eval trackname=\${TRACK$n}
		duree=$((fin-debut))

		offset1=$((debut/360000)):$((debut%360000/6000)):$((debut%360000%6000/100)).$((debut%360000%6000%100))
		offset2=$((duree/360000)):$((duree%360000/6000)):$((duree%360000%6000/100)).$((duree%360000%6000%100))

		sox "${TMPWAV}" "${trackname}".wav trim "${offset1}" "${offset2}"
		case ${OUTFORMAT} in
			mp3) lame --preset insame "${trackname}".wav "${trackname}".mp3 ;;
			ogg) oggenc -q 10 "${trackname}".wav -o "${trackname}".ogg ;;
			wav) : ;;
			ape) mac "${trackname}".wav "${trackname}".ape -c5000 ;;
			mpc) mppenc --xtreme "${trackname}".wav ;;
			flac) flac -8 "${trackname}".wav ;;
		esac
		((erase)) && rm -f "${trackname}".wav
	done
}

splitandconvert

((erase)) && rm -f "${TMPWAV}"

exit 0