update_walk: move code to update_db.c

1 files changed, 103 insertions, 0 deletions

diff --git a/src/update_db.c b/src/update_db.c
new file mode 100644
index 000000000..f2126c559
--- /dev/null
+++ b/src/update_db.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2003-2012 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h" /* must be first for large file support */
+#include "update_db.h"
+#include "update_internal.h"
+#include "directory.h"
+#include "song.h"
+#include "db_lock.h"
+
+#include <glib.h>
+#include <assert.h>
+
+void
+delete_song(struct directory *dir, struct song *del)
+{
+	assert(del->parent == dir);
+
+	/* first, prevent traversers in main task from getting this */
+	directory_remove_song(dir, del);
+
+	db_unlock(); /* temporary unlock, because update_remove_song() blocks */
+
+	/* now take it out of the playlist (in the main_task) */
+	update_remove_song(del);
+
+	/* finally, all possible references gone, free it */
+	song_free(del);
+
+	db_lock();
+}
+
+/**
+ * Recursively remove all sub directories and songs from a directory,
+ * leaving an empty directory.
+ *
+ * Caller must lock the #db_mutex.
+ */
+static void
+clear_directory(struct directory *directory)
+{
+	struct directory *child, *n;
+	directory_for_each_child_safe(child, n, directory)
+		delete_directory(child);
+
+	struct song *song, *ns;
+	directory_for_each_song_safe(song, ns, directory) {
+		assert(song->parent == directory);
+		delete_song(directory, song);
+	}
+}
+
+void
+delete_directory(struct directory *directory)
+{
+	assert(directory->parent != NULL);
+
+	clear_directory(directory);
+
+	directory_delete(directory);
+}
+
+bool
+delete_name_in(struct directory *parent, const char *name)
+{
+	bool modified = false;
+
+	db_lock();
+	struct directory *directory = directory_get_child(parent, 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;
+	}
+
+	db_unlock();
+
+	playlist_vector_remove(&parent->playlists, name);
+
+	return modified;
+}