tag: add attribute "has_playlist"

src/song_save.c

@@ -100,6 +100,13 @@ song_load(FILE *fp, struct directory *parent, const char *uri,
 			}
 
 			song->tag->time = atoi(value);
+		} else if (strcmp(line, "Playlist") == 0) {
+			if (!song->tag) {
+				song->tag = tag_new();
+				tag_begin_add(song->tag);
+			}
+
+			song->tag->has_playlist = strcmp(value, "yes") == 0;
 		} else if (strcmp(line, SONG_MTIME) == 0) {
 			song->mtime = atoi(value);
 		} else if (strcmp(line, "Range") == 0) {

src/tag.c

@@ -158,6 +158,7 @@ struct tag *tag_new(void)
 	struct tag *ret = g_new(struct tag, 1);
 	ret->items = NULL;
 	ret->time = -1;
+	ret->has_playlist = false;
 	ret->num_items = 0;
 	return ret;
 }
@@ -226,6 +227,7 @@ struct tag *tag_dup(const struct tag *tag)
 
 	ret = tag_new();
 	ret->time = tag->time;
+	ret->has_playlist = tag->has_playlist;
 	ret->num_items = tag->num_items;
 	ret->items = ret->num_items > 0 ? g_malloc(items_size(tag)) : NULL;
 

src/tag.h

@@ -88,6 +88,12 @@ struct tag {
 	 */
 	int time;
 
+	/**
+	 * Does this file have an embedded playlist (e.g. embedded CUE
+	 * sheet)?
+	 */
+	bool has_playlist;
+
 	/** an array of tag items */
 	struct tag_item **items;
 

src/tag_save.c

@@ -28,6 +28,9 @@ void tag_save(FILE *file, const struct tag *tag)
 	if (tag->time >= 0)
 		fprintf(file, SONG_TIME "%i\n", tag->time);
 
+	if (tag->has_playlist)
+		fprintf(file, "Playlist: yes\n");
+
 	for (unsigned i = 0; i < tag->num_items; i++)
 		fprintf(file, "%s: %s\n",
 			tag_item_names[tag->items[i]->type],