refactor and added sync functionality

yt

@@ -27,14 +27,19 @@ test -n "$YT_PL_DIR" \
 	|| test -n "$XDG_DATA_HOME" && YT_PL_DIR="$XDG_DATA_HOME/yt" \
 	|| YT_PL_DIR="$HOME/.local/share/yt"
 
+test -d "$YT_PL_DIR" \
+	|| mkdir -p "$YT_PL_DIR"
+
 argv0="$0"
 com="$1"
-
+u='add | archive | clone | list | new | pick | play | search | sync | verify'
 FMT='%(title)s – %(channel)s (%(duration>%H:%M:%S)s) [%(webpage_url)s]'
 WBAPI='https://archive.org/wayback/available?url='
 
 
 add() { # adds a video to a playlist file
+	test -z "$2" || test -n "$3" && usage 'add uri playlist'
+
 	while test -f "$YT_PL_DIR/$2.m3u"; do
 		file="$YT_PL_DIR/$2.m3u"
 		video="$(printf '%s\n' "$1" \
@@ -57,6 +62,8 @@ add() { # adds a video to a playlist file
 }
 
 archive() { # archives a video to the Wayback Machine
+	test -z "$1" && usage 'archive uri...'
+
 	while test -n "$1"; do
 		if test -n "$(printf '%s\n' "$1" | grep -e 'web\.archive\.org')"
 		then
@@ -78,6 +85,8 @@ archive() { # archives a video to the Wayback Machine
 }
 
 cache() { # cache the video title for faster retrieval
+	test -z "$1" && usage 'cache video...'
+
 	test -e "$cachefile" || touch "$cachefile"
 
 	while test -n "$1"; do
@@ -88,12 +97,20 @@ cache() { # cache the video title for faster retrieval
 }
 
 clone() { # clones a YouTube playlist to a file
-	test -d "$YT_PL_DIR" || mkdir -p "$YT_PL_DIR"
+	test -z "$1" && usage 'clone uri [playlist]'
 
-	test -n "$2" && file="$2" \
-		|| file="$YT_PL_DIR/$(yt-dlp -s -I '1:1' --print '%(playlist)s' "$1").m3u"
+	title="$(yt-dlp -s -I '1:1' --print '%(playlist)s' "$1")"
+
+	file="$YT_PL_DIR/$title.m3u"
+	creator="$(yt-dlp -s -I '1:1' --print '%(playlist_uploader)s' "$1")"
+
+	videos="$(yt-dlp --flat-playlist "$1" --print url)"
+	prefix="$(printf "#EXTM3U\n#EXTART:%s\n#PLAYLIST:%s [%s]\n" \
+		"$creator" "$title" "$1")"
+
+	printf "%s: %s: Saving playlist to %s.\n" "$argv0" "$title" "$file" 1>&2
+	printf '%s\n\n%s\n' "$prefix" "$videos" >"$file"
 
-	yt-dlp --flat-playlist "$1" --print url > "$file"
 	verify "$file"
 }
 
@@ -105,6 +122,8 @@ lines() {
 }
 
 list() {
+	test -n "$1" && usage 'list'
+
 	if test -z "$YTPICK"; then
 		printf "%s: Please set \$YTPICK to your preferred picking tool." \
 			"$argv0" 1>&2
@@ -128,16 +147,23 @@ menu() {
 		printf '%s/%s\n' "$dir" "$playlist"
 }
 
-music() { # downloads a video, splitting by chapter and only saving the audio
-	while test -n "$1"; do
-		yt-dlp -vx --split-chapters -o \
-			"chapter:%(fulltitle)s - %(section_number)s %(section_title)s.%(ext)s" \
-			"$1" --audio-quality 0 >> log 2>&1
-		shift
-	done
+new() {
+	test -z "$1" && usage 'new playlist...'
+
+	file="$YT_PL_DIR/$1.m3u"
+
+	if test -f "$file"; then
+		printf "%s: %s: File exists." "$argv0" "$file"
+	elif test -d "$file"; then
+		printf "%s: %s: Is a directory." "$argv0" "$file"
+	else
+		touch "$file"
+	fi
 }
 
 pick() { # Pick a video to play from a playlist of videos
+	test -z "$1" && usage 'pick playlist...'
+
 	if test -z "$YTPICK"; then
 		printf "%s: Please set \$YTPICK to your preferred picking tool." \
 			"$argv0" 1>&2
@@ -172,6 +198,8 @@ pick() { # Pick a video to play from a playlist of videos
 }
 
 play() { # play a video after caching its title
+	test -z "$1" && usage 'play uri...'
+
 	if test -z "$PLAYER"; then
 		printf "%s: Please set \$PLAYER to your preferred video player." \
 			"$argv0" 1>&2
@@ -183,6 +211,8 @@ play() { # play a video after caching its title
 }
 
 queue() {
+	test -z "$1" && usage 'queue playlist...'
+
 	if test -z "$PLAYER"; then
 		printf "%s: Please set \$PLAYER to your preferred video player." \
 			"$argv0" 1>&2
@@ -196,6 +226,8 @@ queue() {
 }
 
 search() {
+	test -z "$1" && usage 'search term [count]'
+
 	if test -z "$YTPICK"; then
 		printf "%s: Please set \$YTPICK to your preferred picking tool." \
 			"$argv0" 1>&2
@@ -229,12 +261,40 @@ search() {
 	fi
 }
 
+sync() {
+	if test -z "$1"
+	then
+		set -- "$YT_PL_DIR"/*.m3u
+	else
+		P="$(printf '%s\n' "$YT_PL_DIR" | sed 's;\/;\\/;g')"
+		set -- $(printf "$@" | sed "s/.* /$P\/&\.m3u/g")
+	fi
+
+	while test -n "$1"; do
+		file="$1"
+
+		if test -f "$file"; then
+			URL="$(sed -n 's/^\#PLAYLIST:.* \[//p' <"$file" | tr -d ']')"
+
+			if test -n "$URL"; then
+				mv "$file" "$file.old"
+
+				clone "$URL" || mv "$file.old" "$file"
+			fi
+		fi
+
+		shift
+	done
+}
+
 usage() {
 	printf "Usage: %s %s\n" "$argv0" "$@" 1>&2
 	exit 64 # sysexits.h(3) EX_USAGE
 }
 
 verify() { # replaces videos with archived versions if they are not available
+	test -z "$1" && usage 'verify playlist...'
+
 	while test -f "$YT_PL_DIR/$1.m3u"; do
 		file="$YT_PL_DIR/$1.m3u"
 
@@ -284,57 +344,11 @@ for dep in \
 do
 	if ! command -v "$dep" >/dev/null
 	then
-		printf "%s: %s: Missing dependency." "$argv0" "$dep" 1>&2
+		printf "%s: %s: Missing dependency.\n" "$0" "$dep" 1>&2
 		exit 69 # syexits.h(3) EX_UNAVAILABLE
 	fi
 done
 
-case "$com" in
-	add)
-		shift 2>/dev/null || usage 'add uri file'
-		add "$@"
-		;;
-	archive)
-		shift 2>/dev/null || usage 'archive uri...'
-		archive "$@"
-		;;
-	cache)
-		shift 2>/dev/null || usage 'cache uri...'
-		cache "$@"
-		;;
-	clone)
-		shift 2>/dev/null || usage 'clone uri [file]'
-		clone "$@"
-		;;
-	list)
-		shift 2>/dev/null || usage 'list'
-		list "$@"
-		;;
-	music)
-		shift 2>/dev/null || usage 'music uri...'
-		music "$@"
-		;;
-	pick)
-		shift 2>/dev/null || usage 'pick file...'
-		pick "$@"
-		;;
-	play)
-		shift 2>/dev/null || usage 'play uri...'
-		play "$@"
-		;;
-	queue)
-		shift 2>/dev/null || usage 'queue file...'
-		queue "$@"
-		;;
-	search)
-		shift 2>/dev/null || usage 'search term [count]'
-		search "$@"
-		;;
-	verify)
-		shift 2>/dev/null || usage 'file...'
-		verify "$@"
-		;;
-	*)
-		usage 'add | clone | list | music | pick | play | verify'
-		;;
-esac
+test -n "$com" && shift || usage "$u"
+
+"$com" "$@"