Allow passing filename with each flac file to process on a new line

fix_unknown_album_and_artist_flac_file.sh

@@ -1,25 +1,48 @@
 #!/bin/bash
 
 # script to fix where flac tags are set correctly but navidrome still sees them as having [Unknown album] and [Unknown artist]
-# usage: fix_unknown_album_and_artist_flac_file.sh FILENAME [LOCATION]
+# usage: fix_unknown_album_and_artist_flac_file.sh FILENAME [LOCATION] [-l]
 # parameters:
-# 	FILENAME: file to fix
+# 	FILENAME: 		file to fix. Can be a relative or absolute path
 # 	LOCATION: 		optional, location of the file, if the script is run from a different directory than where the file to fix is.
+#	-l LISTFILE:	optional, location of file containing multiple files to fix, each starting with a new line. 
+#					This is the same as running the script for each single file in the list
+
+
+function fix_flac_file()
+{
+	echo "Fixing flac file $1"
+
+	echo "running command ffmpeg -i $1 -c:a flac -map_metadata 0 fixed.flac"
+
+	ffmpeg -i "$1" -c:a flac -map_metadata 0 "fixed.flac"
+
+	echo "moving fixed.flac to $1"
+	mv "fixed.flac" "$1"
+}
 
 if [ -z "$2" ]
 then
 	echo "staying in current directory"
 else
+	if [ "$2" = "-l" ]
+	then
+		if [ -z "$3" ]
+		then
+			echo "Please provide the location of the file with multiple entries to fix"
+			exit 1;
+		else
+			echo "Looping through $3"
+			while read flacfile; do
+				echo "Processing line $flacfile"
+				fix_flac_file "$flacfile"
+			done < "$3"
+			exit 0;
+		fi
+	else
 		echo "moving to $2"
 			cd "$2"
+	fi
 fi
 
-echo "Fixing flac file $1"
+fix_flac_file $1
-
-echo "running command ffmpeg -i $1 -c:a flac -map_metadata 0 fixed.flac"
-
-ffmpeg -i "$1" -c:a flac -map_metadata 0 "fixed.flac"
-
-echo "moving fixed.flac to $1"
-mv "fixed.flac" "$1"
-