/*
* 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"
#include "lib/icu/Collate.hxx"
#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 IcuCollate(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 */
gcc_pure
static bool
song_cmp(const Song &a, 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 < 0;
/* then sort by disc */
ret = compare_tag_item(a.tag, b.tag, TAG_DISC);
if (ret != 0)
return ret < 0;
/* then by track number */
ret = compare_tag_item(a.tag, b.tag, TAG_TRACK);
if (ret != 0)
return ret < 0;
/* still no difference? compare file name */
return IcuCollate(a.uri, b.uri) < 0;
}
void
song_list_sort(SongList &songs)
{
songs.sort(song_cmp);
}
