add alternative rfc822 tag names

music_tagmove_lib

@@ -78,12 +78,16 @@ function read_tag_id3 {
 	local tag="$1"
 	local file="$2"
 
-	# TODO: Amorphis/Eclipse eclipse uses 3char id3v2 rfc822 codes
 	declare -A id3v2_map=( [artist]=TPE1 \
 		               [album]=TALB \
 			       [title]=TIT2 \
 			       [date]=TYER \
 			       [track]=TRCK )
+        declare -A id3v2_map_alt=( [artist]=TP1 \
+		                   [album]=TAL \
+				   [title]=TT2 \
+				   [date]=TYE \
+				   [track]=TRK )
 
 	local id3v2_content_rfc822
 	id3v2_content_rfc822=$(id3v2 -R "$file")
@@ -102,14 +106,26 @@ function read_tag_id3 {
 			error "Unknown tag \"$tag\" requested for file \"$file\""
 			return
 		fi
+
+		local substr_idx=6
 		local line=$(grep -E "^$rfc822tag:\s" <<<"$id3v2_content_rfc822" | head -1)
-		local result=${line:6}
+		if [[ -z $line ]]; then
+			rfc822tag=${id3v2_map_alt[$tag]}
+			line=$(grep -E "^$rfc822tag:\s" <<<"$id3v2_content_rfc822" | head -1)
+			substr_idx=5
+		fi
+
+		local result=${line:${substr_idx}}
 
 		if [[ -z $result ]]; then
 			error "Reading tag \"$tag\" from \"$file\" failed: empty value"
 			return
 		fi
 
+		if [[ $tag == 'track' ]]; then
+			result=$(grep -oE '^[[:digit:]]+' <<<"$result")
+		fi
+
 		echo "$result"
 	fi
 }