#!/bin/bash

# Set a sane path, never assume one
PATH=/usr/local/bin:/usr/bin:/bin:/sbin

# If nothing is on the commandline, print this use statement
# This way it won't be run by accident

# Anything at all after the command will trigger it, this only 
# checks for ./command    with nothing after it.

if [ "$1a" == 'a' ] ; then
	cat <<EOF
	---------------------------------------------------
	===================================================

	$0 will rename any mp3 file found recursively from 

	`pwd` 

	and copy them into 
	
	`pwd`/newfiles

	The new file name is based on mp3 ID3 tag info if there
	is any.  Artist-Album-Track Number-Song.mp3 is the form

	To make this run, do as follows
	$0 y

	===================================================
	---------------------------------------------------
EOF

	exit 1
fi

# Check to see if mp3info is installed
BINLOC=`which mp3info`

if [ ! -x "$BINLOC" ] ; then
	echo "Can't find mp3info...do you have it installed?"
	exit 1
fi

# Create a directory to place the new files in
# This way the originals are still around in case you blow up
# this script.

mkdir newfiles

# Loop over a find.  This will recursively find any file *.mp3
# from your cwd

# $SONG is each filename as it comes up from the find
for SONG in `find . -type f -name "*.mp3"` ; do

	# $NEWNAME is arbitrary construct for the new filename
	# generated by the output of running mp3info on each file
	# format is artist-album-track number-track title

	NEWNAME=`mp3info -p %a-%l-%n-%t.mp3 $SONG`

	# Copy the old file and rename to the new name
	cp "$SONG" newfiles/"$NEWNAME"

	# Just something to look at while it runs
	echo "creating ./newfiles/$NEWNAME "
done

echo "All finished... files are in ./newfiles/"