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authorMax Kellermann <max@duempel.org>2014-01-24 16:18:50 +0100
committerMax Kellermann <max@duempel.org>2014-01-24 16:38:44 +0100
commit9d34fc394ce30a28ec0e43f2ad7172b8de8b3be6 (patch)
tree4b58951bc81b17f16140c7f743a163bd837827bf /src/db/SongSort.cxx
parent973c9872f930d73a8ddc98e4802b242aea9f0dba (diff)
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Database*: move to db/
Diffstat (limited to 'src/db/SongSort.cxx')
-rw-r--r--src/db/SongSort.cxx114
1 files changed, 114 insertions, 0 deletions
diff --git a/src/db/SongSort.cxx b/src/db/SongSort.cxx
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+/*
+ * Copyright (C) 2003-2014 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 "SongSort.hxx"
+#include "Song.hxx"
+#include "tag/Tag.hxx"
+
+extern "C" {
+#include "util/list_sort.h"
+}
+
+#include <glib.h>
+
+#include <stdlib.h>
+
+static int
+compare_utf8_string(const char *a, const char *b)
+{
+ if (a == nullptr)
+ return b == nullptr ? 0 : -1;
+
+ if (b == nullptr)
+ return 1;
+
+ return g_utf8_collate(a, b);
+}
+
+/**
+ * Compare two string tag values, ignoring case. Either one may be
+ * nullptr.
+ */
+static int
+compare_string_tag_item(const Tag &a, const Tag &b,
+ TagType type)
+{
+ return compare_utf8_string(a.GetValue(type),
+ b.GetValue(type));
+}
+
+/**
+ * Compare two tag values which should contain an integer value
+ * (e.g. disc or track number). Either one may be nullptr.
+ */
+static int
+compare_number_string(const char *a, const char *b)
+{
+ long ai = a == nullptr ? 0 : strtol(a, nullptr, 10);
+ long bi = b == nullptr ? 0 : strtol(b, nullptr, 10);
+
+ if (ai <= 0)
+ return bi <= 0 ? 0 : -1;
+
+ if (bi <= 0)
+ return 1;
+
+ return ai - bi;
+}
+
+static int
+compare_tag_item(const Tag &a, const Tag &b, TagType type)
+{
+ return compare_number_string(a.GetValue(type),
+ b.GetValue(type));
+}
+
+/* Only used for sorting/searchin a songvec, not general purpose compares */
+static int
+song_cmp(gcc_unused void *priv, struct list_head *_a, struct list_head *_b)
+{
+ const Song *a = (const Song *)_a;
+ const Song *b = (const 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(nullptr, songs, song_cmp);
+}