only update changed tags

lib/tags/updateTags

@@ -1,29 +1,23 @@
 #!/bin/bash
 updateTags() {
+	local		\
+		ual	\
+		uaa	\
+		uar	\
+		uco	\
+		udi	\
+		uge	\
+		upe	\
+		uti	\
+		utr	\
+		uye	\
+		ura	\
+		uch	\
+		ubi
 	for reader in "${tagreaders[@]}"
 	do
 		tagreaderclause+="${tagreaderclause:+ AND }NOT tags.tagreader = \"$reader\""
 	done
-	echo '
-		SELECT	COUNT(DISTINCT source_files.filename)
-		FROM			source_files
-			INNER JOIN	destination_files
-				ON	destination_files.source_file_id=source_files.id
-			INNER JOIN	destinations
-				ON	destination_files.destination_id=destinations.id
-			INNER JOIN	mime_type_actions
-				ON	destinations.id=mime_type_actions.destination_id
-			INNER JOIN	tags
-				ON	source_files.id=tags.source_file
-		WHERE	mime_type_actions.id = source_files.mime_type
-		AND	(
-					CAST(tags.last_change AS TEXT)
-					<>
-					CAST(source_files.last_change AS TEXT)
-				OR	('"$tagreaderclause"')
-			)
-		AND	mime_type_actions.action = 1;' >&3
-	read -u4 filecount
 	echo '
 		SELECT DISTINCT
 			source_files.id,
@@ -66,6 +60,7 @@ updateTags() {
 	while ! [[ $line = AtOM:NoMoreFiles ]]
 	do
 		tagfiles+=("$line")
+		(( filecount++ ))
 		read -u4 line
 	done
 	echo 'BEGIN TRANSACTION;' >&3
@@ -113,22 +108,35 @@ updateTags() {
 		fi
 		if getTags
 		then
-			Update tags				\
+			[[ $oldalbum	!= "$album"	]]&& ual=1
-			album		"${album:-NULL}"	\
+			[[ $oldalbumartist != "$albumartist" ]]&&uaa=1
-			albumartist	"${albumartist:-NULL}"	\
+			[[ $oldartist	!= "$artist"	]]&& uar=1
-			artist		"${artist:-NULL}"	\
+			[[ $oldcomposer	!= "$composer"	]]&& uco=1
-			composer	"${composer:-NULL}"	\
+			[[ $olddisc	!= "$disc"	]]&& udi=1
-			disc		"${disc:-NULL}"		\
+			[[ $oldgenre	!= "$genre"	]]&& uge=1
-			genre		"${genre:-NULL}"	\
+			[[ $oldperformer != "$performer" ]]&& upe=1
-			performer	"${performer:-NULL}"	\
+			[[ $oldtitle	!= "$title"	]]&& uti=1
-			title		"${title:-NULL}"	\
+			[[ $oldtrack	!= "$track"	]]&& utr=1
-			track		"${tracknum:-NULL}"	\
+			[[ $oldyear	!= "$year"	]]&& uye=1
-			year		"${year:-NULL}"		\
+			[[ $oldrate	!= "$rate"	]]&& ura=1
-			last_change	"$lastchange"		\
+			[[ $oldchannels	!= "$channels"	]]&& uch=1
-			rate		"${rate:-NULL}"		\
+			[[ $oldbitrate	!= "$bitrate"	]]&& ubi=1
-			channels	"${channels:-NULL}"	\
+			Update tags					\
-			bitrate		"${bitrate:-NULL}"	\
+			${ual:+album		"${album:-NULL}"}	\
-			tagreader	"$tagreader"		\
+			${uaa:+albumartist	"${albumartist:-NULL}"}	\
+			${uar:+artist		"${artist:-NULL}"}	\
+			${uco:+composer		"${composer:-NULL}"}	\
+			${udi:+disc		"${disc:-NULL}"}	\
+			${uge:+genre		"${genre:-NULL}"}	\
+			${upe:+performer	"${performer:-NULL}"}	\
+			${uti:+title		"${title:-NULL}"}	\
+			${utr:+track		"${tracknum:-NULL}"}	\
+			${uye:+year		"${year:-NULL}"}	\
+			last_change		"$lastchange"		\
+			${ura:+rate		"${rate:-NULL}"}	\
+			${uch:+channels		"${channels:-NULL}"}	\
+			${ubi:+bitrate		"${bitrate:-NULL}"}	\
+			tagreader		"$tagreader"		\
 		>/dev/null <<<"source_file = $sourcefileid"
 		unset	genre		\
 			albumartist	\