#! /bin/sh

# $NetBSD: id3info.sh,v 1.1 2007/04/15 15:22:44 agc Exp $
#
# Copyright © 2007 Alistair Crooks.  All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote
#    products derived from this software without specific prior written
#    permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
# GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

# set defaults
roots=/usr/music
infofile=/usr/music/.id3info
append=false

# function to trawl through a directory to grab id3 tags from each file
# relies on id3 utility to  do this
dodir() {
	(cd $1 &&
	for f in *; do
		if [ -f $f ]; then
			id3 -l -R $f >> $infofile
			echo "Directory: $2" >> $infofile
		elif [ -d $f ]; then
			dodir $f $2/$f
		fi
	done)
}

# argument processing
while [ $# -gt 0 ]; do
	case $1 in
	--append)	append=true
			;;
	--roots=)	roots=$(echo $1 | sed -e 's|--roots=||')
			;;
	--infofile=)	infofile=$(echo $1 | sed -e 's|--infofile=||')
			;;
	esac
	shift
done

# sort out whether we'll append or start afresh
if $append; then
	echo "Appending to file $infofile"
else
	rm -f $infofile
	touch $infofile
fi

# grab all the id3 info
for d in $roots; do
	dodir $d $d
done

exit 0