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Diffstat (limited to 'src/SongSort.cxx')
-rw-r--r-- | src/SongSort.cxx | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/src/SongSort.cxx b/src/SongSort.cxx new file mode 100644 index 000000000..f1eba0439 --- /dev/null +++ b/src/SongSort.cxx @@ -0,0 +1,124 @@ +/* + * Copyright (C) 2003-2013 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 "util/list.h" +#include "tag/Tag.hxx" + +extern "C" { +#include "util/list_sort.h" +} + +#include <glib.h> + +#include <assert.h> +#include <stdlib.h> + +static const char * +tag_get_value_checked(const Tag *tag, enum tag_type type) +{ + return tag != NULL + ? tag->GetValue(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 Tag *a, const 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 Tag *a, const 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(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(NULL, songs, song_cmp); +} |