#!/bin/bash

finallog="/var/tmp/mplaydiff.log"

if [ ! -r /var/tmp/mplaylist-old ]; then
	mpc playlist > /var/tmp/mplaylist
	sort -o /var/tmp/mplaylist /var/tmp/mplaylist
	cp /var/tmp/mplaylist /var/tmp/mplaylist-old
	echo "mpplaylists initialized"
	exit 1
fi

check=$(cmp /var/tmp/mplaylist-old /var/tmp/mplaylist)
if [ -z "$check" ]; then
	exit 0
fi

REMOVED=$(comm -23 /var/tmp/mplaylist-old /var/tmp/mplaylist)
comm -23 /var/tmp/mplaylist-old /var/tmp/mplaylist > /var/tmp/mplaylist-removed
ADDED=$(comm -13 /var/tmp/mplaylist-old /var/tmp/mplaylist)
comm -13 /var/tmp/mplaylist-old /var/tmp/mplaylist > /var/tmp/mplaylist-added

datum=$(date +%Y%m%d-%H%M%S)
echo "::: $datum :::" >> $finallog

if [ "$REMOVED" != "" ]; then
#	echo "removed files:" >> $finallog
#	cat /var/tmp/mplaylist-removed
	sed -is "s/^/- /" /var/tmp/mplaylist-removed
	cat /var/tmp/mplaylist-removed >> $finallog
	echo
fi
if [ "$ADDED" != "" ]; then
#	echo "added files:" >> $finallog
#	cat /var/tmp/mplaylist-added
	sed -is "s/^/+ /" /var/tmp/mplaylist-added
	cat /var/tmp/mplaylist-added >> $finallog
fi

mv -f /var/tmp/mplaylist /var/tmp/mplaylist-old
mpc playlist > /var/tmp/mplaylist
sort -o /var/tmp/mplaylist /var/tmp/mplaylist