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-rw-r--r--src/song_sort.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/src/song_sort.c b/src/song_sort.c
new file mode 100644
index 000000000..397d2c7a9
--- /dev/null
+++ b/src/song_sort.c
@@ -0,0 +1,121 @@
+/*
+ * 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"
+#include "song_sort.h"
+#include "song.h"
+#include "util/list.h"
+#include "util/list_sort.h"
+#include "tag.h"
+
+#include <glib.h>
+
+#include <assert.h>
+#include <stdlib.h>
+
+static const char *
+tag_get_value_checked(const struct tag *tag, enum tag_type type)
+{
+ return tag != NULL
+ ? tag_get_value(tag, type)
+ : NULL;
+}
+
+static int
+compare_utf8_string(const char *a, const char *b)
+{
+ if (a == NULL)
+ return b == NULL ? 0 : -1;
+
+ if (b == NULL)
+ return 1;
+
+ return g_utf8_collate(a, b);
+}
+
+/**
+ * Compare two string tag values, ignoring case. Either one may be
+ * NULL.
+ */
+static int
+compare_string_tag_item(const struct tag *a, const struct tag *b,
+ enum tag_type type)
+{
+ return compare_utf8_string(tag_get_value_checked(a, type),
+ tag_get_value_checked(b, type));
+}
+
+/**
+ * Compare two tag values which should contain an integer value
+ * (e.g. disc or track number). Either one may be NULL.
+ */
+static int
+compare_number_string(const char *a, const char *b)
+{
+ long ai = a == NULL ? 0 : strtol(a, NULL, 10);
+ long bi = b == NULL ? 0 : strtol(b, NULL, 10);
+
+ if (ai <= 0)
+ return bi <= 0 ? 0 : -1;
+
+ if (bi <= 0)
+ return 1;
+
+ return ai - bi;
+}
+
+static int
+compare_tag_item(const struct tag *a, const struct tag *b, enum tag_type type)
+{
+ return compare_number_string(tag_get_value_checked(a, type),
+ tag_get_value_checked(b, type));
+}
+
+/* Only used for sorting/searchin a songvec, not general purpose compares */
+static int
+song_cmp(G_GNUC_UNUSED void *priv, struct list_head *_a, struct list_head *_b)
+{
+ const struct song *a = (const struct song *)_a;
+ const struct song *b = (const struct song *)_b;
+ int ret;
+
+ /* first sort by album */
+ ret = compare_string_tag_item(a->tag, b->tag, TAG_ALBUM);
+ if (ret != 0)
+ return ret;
+
+ /* then sort by disc */
+ ret = compare_tag_item(a->tag, b->tag, TAG_DISC);
+ if (ret != 0)
+ return ret;
+
+ /* then by track number */
+ ret = compare_tag_item(a->tag, b->tag, TAG_TRACK);
+ if (ret != 0)
+ return ret;
+
+ /* still no difference? compare file name */
+ return g_utf8_collate(a->uri, b->uri);
+}
+
+void
+song_list_sort(struct list_head *songs)
+{
+ list_sort(NULL, songs, song_cmp);
+}