123 lines
2.8 KiB
C++
123 lines
2.8 KiB
C++
/*
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* Copyright (C) 2003-2013 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "SongSort.hxx"
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#include "Song.hxx"
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#include "tag/Tag.hxx"
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extern "C" {
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#include "util/list_sort.h"
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}
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#include <glib.h>
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#include <stdlib.h>
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static const char *
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tag_get_value_checked(const Tag *tag, TagType type)
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{
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return tag != nullptr
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? tag->GetValue(type)
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: nullptr;
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}
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static int
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compare_utf8_string(const char *a, const char *b)
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{
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if (a == nullptr)
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return b == nullptr ? 0 : -1;
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if (b == nullptr)
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return 1;
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return g_utf8_collate(a, b);
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}
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/**
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* Compare two string tag values, ignoring case. Either one may be
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* nullptr.
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*/
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static int
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compare_string_tag_item(const Tag *a, const Tag *b,
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TagType type)
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{
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return compare_utf8_string(tag_get_value_checked(a, type),
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tag_get_value_checked(b, type));
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}
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/**
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* Compare two tag values which should contain an integer value
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* (e.g. disc or track number). Either one may be nullptr.
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*/
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static int
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compare_number_string(const char *a, const char *b)
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{
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long ai = a == nullptr ? 0 : strtol(a, nullptr, 10);
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long bi = b == nullptr ? 0 : strtol(b, nullptr, 10);
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if (ai <= 0)
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return bi <= 0 ? 0 : -1;
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if (bi <= 0)
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return 1;
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return ai - bi;
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}
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static int
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compare_tag_item(const Tag *a, const Tag *b, TagType type)
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{
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return compare_number_string(tag_get_value_checked(a, type),
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tag_get_value_checked(b, type));
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}
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/* Only used for sorting/searchin a songvec, not general purpose compares */
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static int
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song_cmp(gcc_unused void *priv, struct list_head *_a, struct list_head *_b)
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{
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const Song *a = (const Song *)_a;
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const Song *b = (const Song *)_b;
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int ret;
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/* first sort by album */
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ret = compare_string_tag_item(a->tag, b->tag, TAG_ALBUM);
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if (ret != 0)
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return ret;
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/* then sort by disc */
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ret = compare_tag_item(a->tag, b->tag, TAG_DISC);
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if (ret != 0)
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return ret;
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/* then by track number */
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ret = compare_tag_item(a->tag, b->tag, TAG_TRACK);
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if (ret != 0)
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return ret;
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/* still no difference? compare file name */
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return g_utf8_collate(a->uri, b->uri);
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}
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void
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song_list_sort(struct list_head *songs)
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{
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list_sort(nullptr, songs, song_cmp);
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}
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