fix the script

scripts/duration-length.sh

@@ -4,11 +4,24 @@ file="./scripts/duration-length.txt"
 if [ -f "$file" ]
 then
     for i in $(cat $file); do
-        mp3="https://"$(cat "$i" | grep "^mp3:" | awk -F' ' '{print $2}')
-        duration=$(ffprobe -i "$mp3" -show_entries format=duration -v quiet -of csv="p=0" -sexagesimal)
-        length=$(ffprobe -i "$mp3" -show_entries format=size -v quiet -of csv="p=0")
-        sed -i "s/^duration: .*/duration: \"$duration\"/g" "$i"
-        sed -i "s/^length: .*/length: $length/g" "$i"
-        cat "$i"
+	FIRSTLINE=$(head -n 1 "$i")
+	if [ ${FIRSTLINE:0:3} == "---" ]
+	then
+	    mp3="https://"$(cat "$i" | grep "^mp3:" | awk -F' ' '{print $2}')
+	    duration=$(ffprobe -i "$mp3" -show_entries format=duration -v quiet -of csv="p=0" -sexagesimal)
+	    length=$(ffprobe -i "$mp3" -show_entries format=size -v quiet -of csv="p=0")
+	    sed -i "s/^duration: .*/duration: \"$duration\"/g" "$i"
+	    sed -i "s/^length: .*/length: $length/g" "$i"
+	    cat "$i"
+	fi
+	if [ ${FIRSTLINE:0:3} == "+++" ]
+	then
+	    mp3="https://"$(cat "$i" | grep "^mp3 =" | awk -F' ' '{print $2}')
+	    duration=$(ffprobe -i "$mp3" -show_entries format=duration -v quiet -of csv="p=0" -sexagesimal)
+	    length=$(ffprobe -i "$mp3" -show_entries format=size -v quiet -of csv="p=0")
+	    sed -i "s/^duration = .*/duration = \"$duration\"/g" "$i"
+	    sed -i "s/^length = .*/length = $length/g" "$i"
+	    cat "$i"
+	fi
     done
 fi