core/playlists: Add a pl_next() playlist operation

This is mostly needed so the queued tracks playlist can be saved after
picking a track.

Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

core/playlist.c

@@ -91,12 +91,12 @@ void playlist_sort(enum playlist_type_t type, const gchar *name,
 
 struct track *playlist_next(void)
 {
-	return queue_next(playlist_get_queue(PL_SYSTEM, "Collection"));
+	return playlist_types[PL_SYSTEM]->pl_next("Collection");
 }
 
 struct track *playlist_prev(void)
 {
-	return queue_next(playlist_get_queue(PL_SYSTEM, "History"));
+	return playlist_types[PL_SYSTEM]->pl_next("History");
 }
 
 struct queue *playlist_get_queue(enum playlist_type_t type, const gchar *name)

core/playlists/artist.c

@@ -82,6 +82,12 @@ static void pl_artist_sort(const gchar *name, enum compare_t sort, bool reset)
 	playlist_generic_sort(playlist, sort, reset);
 }
 
+static struct track *pl_artist_next(const gchar *name)
+{
+	struct playlist *playlist = __artist_pl_lookup(name);
+	return playlist_generic_next(playlist);
+}
+
 
 struct playlist_type pl_artist = {
 	.pl_get_queue    = pl_artist_get_queue,
@@ -92,6 +98,7 @@ struct playlist_type pl_artist = {
 	.pl_update       = pl_artist_update,
 	.pl_set_flag     = pl_artist_set_flag,
 	.pl_sort         = pl_artist_sort,
+	.pl_next         = pl_artist_next,
 };
 
 

core/playlists/generic.c

@@ -92,3 +92,8 @@ void playlist_generic_sort(struct playlist *playlist,
 {
 	queue_sort(&playlist->pl_queue, sort, reset);
 }
+
+struct track *playlist_generic_next(struct playlist *playlist)
+{
+	return queue_next(&playlist->pl_queue);
+}

core/playlists/library.c

@@ -204,6 +204,12 @@ static void pl_library_sort(const gchar *name, enum compare_t sort, bool reset)
 	playlist_generic_sort(playlist, sort, reset);
 }
 
+static struct track *pl_library_next(const gchar *name)
+{
+	struct playlist *playlist = __lib_pl_lookup(name);
+	return playlist_generic_next(playlist);
+}
+
 
 struct playlist_type pl_library = {
 	.pl_get_queue    = pl_library_get_queue,
@@ -214,6 +220,7 @@ struct playlist_type pl_library = {
 	.pl_update       = pl_library_update,
 	.pl_set_flag     = pl_library_set_flag,
 	.pl_sort         = pl_library_sort,
+	.pl_next         = pl_library_next,
 };
 
 

core/playlists/system.c

@@ -64,6 +64,7 @@ static struct sys_playlist sys_favorites = {
 	.spl_remove   = sys_pl_favorites_remove,
 	.spl_set_flag = playlist_generic_set_flag,
 	.spl_sort     = playlist_generic_sort,
+	.spl_next     = playlist_generic_next,
 };
 
 
@@ -99,6 +100,7 @@ static struct sys_playlist sys_hidden = {
 	.spl_remove   = sys_pl_hidden_remove,
 	.spl_set_flag = playlist_generic_set_flag,
 	.spl_sort     = playlist_generic_sort,
+	.spl_next     = playlist_generic_next,
 };
 
 
@@ -164,6 +166,7 @@ static struct sys_playlist sys_collection = {
 	.spl_update   = sys_pl_collection_update,
 	.spl_set_flag = sys_pl_collection_set_flag,
 	.spl_sort     = sys_pl_collection_sort,
+	.spl_next     = playlist_generic_next,
 };
 
 
@@ -192,6 +195,7 @@ static struct sys_playlist sys_history = {
 	.spl_remove   = playlist_generic_remove_track,
 	.spl_set_flag = playlist_noop_set_flag,
 	.spl_sort     = playlist_noop_sort,
+	.spl_next     = playlist_generic_next,
 };
 
 
@@ -221,6 +225,7 @@ static struct sys_playlist sys_unplayed = {
 	.spl_update   = sys_pl_unplayed_update,
 	.spl_set_flag = playlist_generic_set_flag,
 	.spl_sort     = playlist_generic_sort,
+	.spl_next     = playlist_generic_next,
 };
 
 
@@ -252,6 +257,7 @@ static struct sys_playlist sys_most_played = {
 	.spl_update   = sys_pl_most_played_update,
 	.spl_set_flag = playlist_generic_set_flag,
 	.spl_sort     = playlist_generic_sort,
+	.spl_next     = playlist_generic_next,
 };
 
 
@@ -283,6 +289,7 @@ static struct sys_playlist sys_least_played = {
 	.spl_update   = sys_pl_least_played_update,
 	.spl_set_flag = playlist_generic_set_flag,
 	.spl_sort     = playlist_generic_sort,
+	.spl_next     = playlist_generic_next,
 };
 
 
@@ -399,6 +406,14 @@ static void pl_system_sort(const gchar *name, enum compare_t sort, bool reset)
 		sys_pl->spl_sort(&sys_pl->spl_playlist, sort, reset);
 }
 
+static struct track *pl_system_next(const gchar *name)
+{
+	struct sys_playlist *sys_pl = __sys_pl_lookup(name);
+	if (sys_pl)
+		return sys_pl->spl_next(&sys_pl->spl_playlist);
+	return NULL;
+}
+
 
 struct playlist_type pl_system = {
 	.pl_get_queue    = pl_system_get_queue,
@@ -409,6 +424,7 @@ struct playlist_type pl_system = {
 	.pl_update       = pl_system_update,
 	.pl_set_flag     = pl_system_set_flag,
 	.pl_sort         = pl_system_sort,
+	.pl_next         = pl_system_next,
 };
 
 

include/core/playlists/system.h

@@ -26,6 +26,7 @@ struct sys_playlist {
 	bool (*spl_update)(struct playlist *, struct track *);
 	void (*spl_set_flag)(struct playlist *, enum queue_flags, bool);
 	void (*spl_sort)(struct playlist *, enum compare_t, bool);
+	struct track *(*spl_next)(struct playlist *);
 };
 
 

include/core/playlists/type.h

@@ -51,6 +51,9 @@ struct playlist_type {
 
 	/* Called to sort a playlist. */
 	void (*pl_sort)(const gchar *, enum compare_t, bool);
+
+	/* Called to pick the next track from a playlist. */
+	struct track *(*pl_next)(const gchar *);
 };
 
 
@@ -80,5 +83,8 @@ void playlist_generic_set_flag(struct playlist *, enum queue_flags, bool);
 /* Generic playlist sorting operation. */
 void playlist_generic_sort(struct playlist *, enum compare_t, bool);
 
+/* Generic playlist next track operation. */
+struct track *playlist_generic_next(struct playlist *);
+
 
 #endif /* OCARINA_CORE_PLAYLISTS_TYPE_H */