#!/bin/sh

usage="Usage $(basename $0): [OPTION]... <DIR>...\n\t-m\tmax size for a file collection\n\t-d\toutput directory\n\t-dvd\tmax size set for dvd\n\t-cd\tmax size set for cd\n"
numdir=0

while [ "$1" != "" ]; do
	if [ "$1" = "-d" ]; then
		odir=$2
		shift
	elif [ "$1" = "-m" ]; then
		max=$2
		shift
	elif [ "$1" = "-dvd" ]; then
		max=4680000000
	elif [ "$1" = "-cd" ]; then
		max=700000000
	else
		dir[$numdir]="$1"
		let numdir="$numdir+1"
		if [ "$odir" = "" ]; then
			odir=$1
		fi
	fi
	shift
done

if [ "$max" = "" ]; then
	echo -e "$(basename $0): -m, -dvd, or -cd option required"
	echo -e "${usage}"
	exit
fi

if [ "$numdir" =  0 ]; then
	echo -e "$(basename $0): no directories specified"
	echo -e "${usage}"
	exit
fi

echo "max=$max"
echo "odir=$odir"
echo "dirs=${dir[@]}"

cnt=0
sdir=${odir}.split

[ "$max" -lt 50000 ] && exit

mkdir "${sdir}"
cdir=1
odir="${sdir}/${cdir}.dir"
mkdir "${odir}"
echo "creating '${odir}'"
find "${dir[@]}" -type f | while read i
do
	fsz=$(stat -c "%s" "$i")
	if [ "$fsz" -gt "$max" ]; then
		echo "XXX error '$i'"
		echo "XXX file size larger than snap size --- invalid!"
		exit
	fi
	if [ "$(($fsz+$cnt))" -gt "$max" ]; then
		cnt=0
		cdir=$(($cdir+1))
		odir="${sdir}/${cdir}.dir"
		mkdir "${odir}"
		echo "creating '${odir}'"
	fi
	cnt=$(($fsz+$cnt))
	mkdir -p "$odir/$(dirname "$i")"
	echo "$cnt \"$i\" \"$odir/$i\"" >> ${odir}/contents.txt
	ln "$i" "$odir/$i"
	
done
gzip "${sdir}"/*/contents.txt