cue2flacs improved

#!/bin/bash
#
#  cue2flacs
#  Copyright (C) 2012 Julian Hughes julianhughes<at>gmailDOTcom
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 3 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# DEPENDENCIES:
# shntool ; cuetag ; flac ; iconv ; python-chardet
# and any other codecs required: for a list of supported codecs see
# the shntool manpage
#

function usage ()
{
	printf "\n\nUSAGE:\
\t$(basename "$0") /path/to/cue_file.cue\n
\tUse find for recursion/multiple cue+image files:\n
\tfind <path> -iname "*.cue" -execdir $(basename "$0") "{}" \+\n
\tThe lossless file must be named exactly as stated in the cue\n\tfile.
\n\t$(basename "$0") splits cue+lossless into individual flacs, named
\tand tagged using the info in the cue.
\tIf the cue sheet is non UTF-8 then a new UTF-8 cue is created.
\tThis preserves diacritic marks and non-Latin characters.\n
\t$(basename "$0") outputs to a new directory whose name is derived
\tfrom the cue's first TITLE field.  No existing files are deleted
\toverwritten or modified by this script.
\tFor a list of supported codecs see the shntool manpage.\n
\tThere are no user options or settings.\n
\tI didn't include error checking so if it fails uncomment
\t'set -x' and have a look for yourself.\n\n"
}

if [ $# -lt 1 ]; then
	usage
	exit 1
fi

for i in "$@" ; do

#find character encoding of cue. if not utf-8 then create new utf-8 cue
UTFCUE="${i%.*}"_utf.cue
CHARSET="$(chardet "$i" |cut -d ":" -f 2|cut -d "(" -f 1 )"
if [ "$CHARSET" != utf-8 ]; then
		iconv -f "$CHARSET" -t utf8 "$i" -o "$UTFCUE"
		CUE="$UTFCUE"
		else
		CUE="$i"
fi

#get lossless image file name from $CUE
IMG="$(dirname "$i")"/"$(grep FILE "$CUE"|awk -F "\"" '{print $2}')"

#get album title from $CUE; remove unwanted characters.
ALBUM="$(cueprint -d '%T\n' "$CUE")"
ALBUM="$(echo $ALBUM |sed 's/[;]/-/g;s/[/]/-/g;s/[<]/-/g;s/[>]/-/g;s/[:]/-/g;s/[|]/-/g;s/[\]/-/g;s/[\]/-/g')"

OUTDIR="$(dirname "$i")"/$ALBUM

#quit if lossless image file doesn't exist
if [ ! -e "$IMG" ]; then
		printf "\n\tSupported lossless file not found.  Check that cue \
file references a valid file\n\n"
exit
fi

#create output directory
if [ ! -d "$OUTDIR" ]; then
		mkdir "$OUTDIR"
fi

#split image and set file names from cue: 'number - title'
shnsplit -d "$OUTDIR" -f "$CUE" -t "%n - %t" -o flac "$IMG"

#remove unwanted pregap files (if any)
if [ -e "$OUTDIR"/"00 - pregap.flac" ]; then
		rm "$OUTDIR"/"00 - pregap.flac"
fi

#write tags from cue to new files
cuetag "$CUE" "$OUTDIR"/*.flac
done
exit