79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
|
/*
|
||
|
|
* 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 "DatabaseHelpers.hxx"
|
||
|
|
#include "DatabasePlugin.hxx"
|
||
|
|
#include "song.h"
|
||
|
|
#include "tag.h"
|
||
|
|
|
||
|
|
#include <functional>
|
||
|
|
#include <set>
|
||
|
|
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
struct StringLess {
|
||
|
|
gcc_pure
|
||
|
|
bool operator()(const char *a, const char *b) const {
|
||
|
|
return strcmp(a, b) < 0;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
typedef std::set<const char *, StringLess> StringSet;
|
||
|
|
|
||
|
|
static bool
|
||
|
|
CollectTags(StringSet &set, enum tag_type tag_type, song &song)
|
||
|
|
{
|
||
|
|
struct tag *tag = song.tag;
|
||
|
|
if (tag == nullptr)
|
||
|
|
return true;
|
||
|
|
|
||
|
|
bool found = false;
|
||
|
|
for (unsigned i = 0; i < tag->num_items; ++i) {
|
||
|
|
if (tag->items[i]->type == tag_type) {
|
||
|
|
set.insert(tag->items[i]->value);
|
||
|
|
found = true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!found)
|
||
|
|
set.insert("");
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool
|
||
|
|
VisitUniqueTags(const Database &db, const DatabaseSelection &selection,
|
||
|
|
enum tag_type tag_type,
|
||
|
|
VisitString visit_string,
|
||
|
|
GError **error_r)
|
||
|
|
{
|
||
|
|
StringSet set;
|
||
|
|
|
||
|
|
using namespace std::placeholders;
|
||
|
|
const auto f = std::bind(CollectTags, std::ref(set), tag_type, _1);
|
||
|
|
if (!db.Visit(selection, f, error_r))
|
||
|
|
return false;
|
||
|
|
|
||
|
|
for (auto value : set)
|
||
|
|
if (!visit_string(value, error_r))
|
||
|
|
return false;
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|