directory: add function directory_get_song(), ...

src/directory.c

@@ -177,11 +177,41 @@ directory_lookup_directory(struct directory *directory, const char *uri)
 	return found;
 }
 
+void
+directory_add_song(struct directory *directory, struct song *song)
+{
+	assert(directory != NULL);
+	assert(song != NULL);
+	assert(song->parent == directory);
+
+	songvec_add(&directory->songs, song);
+}
+
+void
+directory_remove_song(struct directory *directory, struct song *song)
+{
+	assert(directory != NULL);
+	assert(song != NULL);
+	assert(song->parent == directory);
+
+	songvec_delete(&directory->songs, song);
+}
+
+struct song *
+directory_get_song(const struct directory *directory, const char *name_utf8)
+{
+	assert(directory != NULL);
+	assert(name_utf8 != NULL);
+
+	struct song *song = songvec_find(&directory->songs, name_utf8);
+	assert(song == NULL || song->parent == directory);
+	return song;
+}
+
 struct song *
 directory_lookup_song(struct directory *directory, const char *uri)
 {
 	char *duplicated, *base;
-	struct song *song;
 
 	assert(directory != NULL);
 	assert(uri != NULL);
@@ -199,7 +229,7 @@ directory_lookup_song(struct directory *directory, const char *uri)
 	} else
 		base = duplicated;
 
-	song = songvec_find(&directory->songs, base);
+	struct song *song = directory_get_song(directory, base);
 	assert(song == NULL || song->parent == directory);
 
 	g_free(duplicated);

src/directory.h

@@ -181,6 +181,28 @@ struct directory *
 directory_lookup_directory(struct directory *directory, const char *uri);
 
 /**
+ * Add a song object to this directory.  Its "parent" attribute must
+ * be set already.
+ */
+void
+directory_add_song(struct directory *directory, struct song *song);
+
+/**
+ * Remove a song object from this directory (which effectively
+ * invalidates the song object, because the "parent" attribute becomes
+ * stale), but does not free it.
+ */
+void
+directory_remove_song(struct directory *directory, struct song *song);
+
+/**
+ * Look up a song in this directory by its name.
+ */
+G_GNUC_PURE
+struct song *
+directory_get_song(const struct directory *directory, const char *name_utf8);
+
+/**
  * Looks up a song by its relative URI.
  *
  * @param directory the parent (or grandparent, ...) directory

src/directory_save.c

@@ -146,7 +146,7 @@ directory_load(FILE *fp, struct directory *directory,
 			const char *name = line + sizeof(SONG_BEGIN) - 1;
 			struct song *song;
 
-			if (songvec_find(&directory->songs, name) != NULL) {
+			if (directory_get_song(directory, name) != NULL) {
 				g_set_error(error, directory_quark(), 0,
 					    "Duplicate song '%s'", name);
 				return NULL;
@@ -157,7 +157,7 @@ directory_load(FILE *fp, struct directory *directory,
 			if (song == NULL)
 				return false;
 
-			songvec_add(&directory->songs, song);
+			directory_add_song(directory, song);
 		} else if (g_str_has_prefix(line, PLAYLIST_META_BEGIN)) {
 			/* duplicate the name, because
 			   playlist_metadata_load() will overwrite the

src/update_walk.c

@@ -93,7 +93,7 @@ static void
 delete_song(struct directory *dir, struct song *del)
 {
 	/* first, prevent traversers in main task from getting this */
-	songvec_delete(&dir->songs, del);
+	directory_remove_song(dir, del);
 
 	/* now take it out of the playlist (in the main_task) */
 	update_remove_song(del);
@@ -144,13 +144,13 @@ static void
 delete_name_in(struct directory *parent, const char *name)
 {
 	struct directory *directory = directory_get_child(parent, name);
-	struct song *song = songvec_find(&parent->songs, name);
 
 	if (directory != NULL) {
 		delete_directory(directory);
 		modified = true;
 	}
 
+	struct song *song = directory_get_song(parent, name);
 	if (song != NULL) {
 		delete_song(parent, song);
 		modified = true;
@@ -357,7 +357,6 @@ static void
 update_archive_tree(struct directory *directory, char *name)
 {
 	struct directory *subdir;
-	struct song *song;
 	char *tmp;
 
 	tmp = strchr(name, '/');
@@ -377,11 +376,11 @@ update_archive_tree(struct directory *directory, char *name)
 			return;
 		}
 		//add file
-		song = songvec_find(&directory->songs, name);
+		struct song *song = directory_get_song(directory, name);
 		if (song == NULL) {
 			song = song_file_load(name, directory);
 			if (song != NULL) {
-				songvec_add(&directory->songs, song);
+				directory_add_song(directory, song);
 				modified = true;
 				g_message("added %s/%s",
 					  directory_get_path(directory), name);
@@ -499,7 +498,7 @@ update_container_file(	struct directory* directory,
 		song->tag = plugin->tag_dup(child_path_fs);
 		g_free(child_path_fs);
 
-		songvec_add(&contdir->songs, song);
+		directory_add_song(contdir, song);
 
 		modified = true;
 
@@ -559,7 +558,7 @@ update_regular_file(struct directory *directory,
 
 	if ((plugin = decoder_plugin_from_suffix(suffix, false)) != NULL)
 	{
-		struct song* song = songvec_find(&directory->songs, name);
+		struct song *song = directory_get_song(directory, name);
 
 		if (!directory_child_access(directory, name, R_OK)) {
 			g_warning("no read permissions on %s/%s",
@@ -592,7 +591,7 @@ update_regular_file(struct directory *directory,
 				return;
 			}
 
-			songvec_add(&directory->songs, song);
+			directory_add_song(directory, song);
 			modified = true;
 			g_message("added %s/%s",
 				  directory_get_path(directory), name);
@@ -800,7 +799,6 @@ directory_make_child_checked(struct directory *parent, const char *name_utf8)
 {
 	struct directory *directory;
 	struct stat st;
-	struct song *conflicting;
 
 	directory = directory_get_child(parent, name_utf8);
 	if (directory != NULL)
@@ -812,7 +810,7 @@ directory_make_child_checked(struct directory *parent, const char *name_utf8)
 
 	/* if we're adding directory paths, make sure to delete filenames
 	   with potentially the same name */
-	conflicting = songvec_find(&parent->songs, name_utf8);
+	struct song *conflicting = directory_get_song(parent, name_utf8);
 	if (conflicting)
 		delete_song(parent, conflicting);