update: store playlist files in database

Don't open the music directory for each "lsinfo" call.  Get the list
of playlist files from the memory database.

4 files changed, 304 insertions, 0 deletions

diff --git a/src/playlist_database.c b/src/playlist_database.c
new file mode 100644
index 000000000..f74406277
--- /dev/null
+++ b/src/playlist_database.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2003-2010 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"
+#include "playlist_database.h"
+#include "playlist_vector.h"
+#include "text_file.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+static GQuark
+playlist_database_quark(void)
+{
+	return g_quark_from_static_string("playlist_database");
+}
+
+void
+playlist_vector_save(FILE *fp, const struct playlist_vector *pv)
+{
+	for (const struct playlist_metadata *pm = pv->head;
+	     pm != NULL; pm = pm->next)
+		fprintf(fp, PLAYLIST_META_BEGIN "%s\n"
+			"mtime: %li\n"
+			"playlist_end\n",
+			pm->name, (long)pm->mtime);
+}
+
+bool
+playlist_metadata_load(FILE *fp, struct playlist_vector *pv, const char *name,
+		       GString *buffer, GError **error_r)
+{
+	struct playlist_metadata pm;
+	char *line, *colon;
+	const char *value;
+
+	while ((line = read_text_line(fp, buffer)) != NULL &&
+	       strcmp(line, "playlist_end") != 0) {
+		colon = strchr(line, ':');
+		if (colon == NULL || colon == line) {
+			g_set_error(error_r, playlist_database_quark(), 0,
+				    "unknown line in db: %s", line);
+			return false;
+		}
+
+		*colon++ = 0;
+		value = g_strchug(colon);
+
+		if (strcmp(line, "mtime") == 0)
+			pm.mtime = strtol(value, NULL, 10);
+		else {
+			g_set_error(error_r, playlist_database_quark(), 0,
+				    "unknown line in db: %s", line);
+			return false;
+		}
+	}
+
+	playlist_vector_update_or_add(pv, name, pm.mtime);
+	return true;
+}
diff --git a/src/playlist_database.h b/src/playlist_database.h
new file mode 100644
index 000000000..7e114abdd
--- /dev/null
+++ b/src/playlist_database.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2003-2010 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.
+ */
+
+#ifndef MPD_PLAYLIST_DATABASE_H
+#define MPD_PLAYLIST_DATABASE_H
+
+#include "check.h"
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <glib.h>
+
+#define PLAYLIST_META_BEGIN "playlist_begin: "
+
+struct playlist_vector;
+
+void
+playlist_vector_save(FILE *fp, const struct playlist_vector *pv);
+
+bool
+playlist_metadata_load(FILE *fp, struct playlist_vector *pv, const char *name,
+		       GString *buffer, GError **error_r);
+
+#endif
diff --git a/src/playlist_vector.c b/src/playlist_vector.c
new file mode 100644
index 000000000..80b70a96c
--- /dev/null
+++ b/src/playlist_vector.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2003-2010 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"
+#include "playlist_vector.h"
+
+#include <assert.h>
+#include <string.h>
+#include <glib.h>
+
+static struct playlist_metadata *
+playlist_metadata_new(const char *name, time_t mtime)
+{
+	assert(name != NULL);
+
+	struct playlist_metadata *pm = g_slice_new(struct playlist_metadata);
+	pm->name = g_strdup(name);
+	pm->mtime = mtime;
+	return pm;
+}
+
+static void
+playlist_metadata_free(struct playlist_metadata *pm)
+{
+	assert(pm != NULL);
+	assert(pm->name != NULL);
+
+	g_free(pm->name);
+	g_slice_free(struct playlist_metadata, pm);
+}
+
+void
+playlist_vector_deinit(struct playlist_vector *pv)
+{
+	assert(pv != NULL);
+
+	while (pv->head != NULL) {
+		struct playlist_metadata *pm = pv->head;
+		pv->head = pm->next;
+		playlist_metadata_free(pm);
+	}
+}
+
+static struct playlist_metadata **
+playlist_vector_find_p(struct playlist_vector *pv, const char *name)
+{
+	assert(pv != NULL);
+	assert(name != NULL);
+
+	struct playlist_metadata **pmp = &pv->head;
+
+	for (;;) {
+		struct playlist_metadata *pm = *pmp;
+		if (pm == NULL)
+			return NULL;
+
+		if (strcmp(pm->name, name) == 0)
+			return pmp;
+
+		pmp = &pm->next;
+	}
+}
+
+struct playlist_metadata *
+playlist_vector_find(struct playlist_vector *pv, const char *name)
+{
+	struct playlist_metadata **pmp = playlist_vector_find_p(pv, name);
+	return pmp != NULL ? *pmp : NULL;
+}
+
+void
+playlist_vector_add(struct playlist_vector *pv,
+		    const char *name, time_t mtime)
+{
+	struct playlist_metadata *pm = playlist_metadata_new(name, mtime);
+	pm->next = pv->head;
+	pv->head = pm;
+}
+
+void
+playlist_vector_update_or_add(struct playlist_vector *pv,
+			      const char *name, time_t mtime)
+{
+	struct playlist_metadata **pmp = playlist_vector_find_p(pv, name);
+	if (pmp != NULL) {
+		struct playlist_metadata *pm = *pmp;
+		pm->mtime = mtime;
+	} else
+		playlist_vector_add(pv, name, mtime);
+}
+
+bool
+playlist_vector_remove(struct playlist_vector *pv, const char *name)
+{
+	struct playlist_metadata **pmp = playlist_vector_find_p(pv, name);
+	if (pmp == NULL)
+		return false;
+
+	struct playlist_metadata *pm = *pmp;
+	*pmp = pm->next;
+
+	playlist_metadata_free(pm);
+	return true;
+}
diff --git a/src/playlist_vector.h b/src/playlist_vector.h
new file mode 100644
index 000000000..a2ba306d3
--- /dev/null
+++ b/src/playlist_vector.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2003-2010 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.
+ */
+
+#ifndef MPD_PLAYLIST_VECTOR_H
+#define MPD_PLAYLIST_VECTOR_H
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <sys/time.h>
+
+/**
+ * A directory entry pointing to a playlist file.
+ */
+struct playlist_metadata {
+	struct playlist_metadata *next;
+
+	/**
+	 * The UTF-8 encoded name of the playlist file.
+	 */
+	char *name;
+
+	time_t mtime;
+};
+
+struct playlist_vector {
+	struct playlist_metadata *head;
+};
+
+static inline void
+playlist_vector_init(struct playlist_vector *pv)
+{
+	pv->head = NULL;
+}
+
+void
+playlist_vector_deinit(struct playlist_vector *pv);
+
+struct playlist_metadata *
+playlist_vector_find(struct playlist_vector *pv, const char *name);
+
+void
+playlist_vector_add(struct playlist_vector *pv,
+		    const char *name, time_t mtime);
+
+void
+playlist_vector_update_or_add(struct playlist_vector *pv,
+			      const char *name, time_t mtime);
+
+bool
+playlist_vector_remove(struct playlist_vector *pv, const char *name);
+
+#endif /* SONGVEC_H */