Check album art and ReplayGain tags of a hierarchical music library

checkalbums.sh

#! /bin/sh

# Check through a hierarchical music library to verify that album art meets a
# minimum size or that music is ReplayGain-tagged.
# Usage:
#   ./checkalbums.sh [-art] [-replaygain]
# If -art is given, verify album art size. If -replaygain is given, check for
# the existence of ReplayGain tags and add them if not present.

MINSIZE=600
MINWIDTH=$MINSIZE
MINHEIGHT=$MINSIZE

if [ $# -eq 0 ]
then
	echo "Usage: $0 [-art] [-replaygain]" 1>&2
	exit 1
fi

if ! type "identify" 1>/dev/null 2>&1
then
    echo "ImageMagick not found!" 1>&2
    exit 2
fi

if ! type "replaygain" 1>/dev/null 2>&1
then
    echo "ReplayGain not found!" 1>&2
    exit 2
fi

if echo "$@" | grep -q "\-art"
then
	echo Checking for album art...
	art=`find . -type f -name *.jpg`
	for album in */*/
	do
		if ! echo "$art" | grep -q "./$album"
		then
			echo Couldn\'t find art for "$album"!
		fi
	done
	echo

	echo Looking for artwork that doesn\'t meet the minimum size...
	echo "$art" | while read album
	do
		dimensions=`identify -format '%[fx:w] %[fx:h]' "$album"`
		width=`echo $dimensions | cut -d ' ' -f 1`
		height=`echo $dimensions | cut -d ' ' -f 2`

		if [ "$width" -lt "$MINWIDTH" -o "$height" -lt "$MINHEIGHT" ]
		then
			echo "`echo $album | sed -e 's/^.\///'` (${width}x${height})"
		fi
	done
	echo
fi

if echo "$@" | grep -q "\-replaygain"
then
	echo Checking for the presence of ReplayGain tags...
	for album in */*
	do
		replaygain -d "$album"/*
	done
fi