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/*
* Copyright 2003-2021 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 "Walk.hxx"
#include "UpdateDomain.hxx"
#include "db/DatabaseLock.hxx"
#include "db/PlaylistVector.hxx"
#include "db/plugins/simple/Directory.hxx"
#include "lib/fmt/ExceptionFormatter.hxx"
#include "song/DetachedSong.hxx"
#include "input/InputStream.hxx"
#include "playlist/PlaylistPlugin.hxx"
#include "playlist/PlaylistRegistry.hxx"
#include "playlist/PlaylistStream.hxx"
#include "playlist/SongEnumerator.hxx"
#include "storage/FileInfo.hxx"
#include "storage/StorageInterface.hxx"
#include "fs/Traits.hxx"
#include "util/StringFormat.hxx"
#include "Log.hxx"
inline void
UpdateWalk::UpdatePlaylistFile(Directory &directory,
SongEnumerator &contents) noexcept
{
unsigned track = 0;
while (true) {
auto song = contents.NextSong();
if (!song)
break;
auto db_song = std::make_unique<Song>(std::move(*song),
directory);
const bool is_absolute =
PathTraitsUTF8::IsAbsoluteOrHasScheme(db_song->filename.c_str());
db_song->target = is_absolute
? db_song->filename
/* prepend "../" to relative paths to go from
the virtual directory (DEVICE_PLAYLIST) to
the containing directory */
: "../" + db_song->filename;
db_song->filename = StringFormat<64>("track%04u",
++track);
{
const ScopeDatabaseLock protect;
directory.AddSong(std::move(db_song));
}
}
}
inline void
UpdateWalk::UpdatePlaylistFile(Directory &parent, std::string_view name,
const StorageFileInfo &info,
const PlaylistPlugin &plugin) noexcept
{
assert(plugin.open_stream);
Directory *directory =
LockMakeVirtualDirectoryIfModified(parent, name, info,
DEVICE_PLAYLIST);
if (directory == nullptr)
/* not modified */
return;
const auto uri_utf8 = storage.MapUTF8(directory->GetPath());
FmtDebug(update_domain, "scanning playlist '{}'", uri_utf8);
try {
Mutex mutex;
auto e = plugin.open_stream(InputStream::OpenReady(uri_utf8.c_str(),
mutex));
if (!e) {
/* unsupported URI? roll back.. */
editor.LockDeleteDirectory(directory);
return;
}
UpdatePlaylistFile(*directory, *e);
if (directory->IsEmpty())
editor.LockDeleteDirectory(directory);
} catch (...) {
FmtError(update_domain,
"Failed to scan playlist '{}': {}",
uri_utf8, std::current_exception());
editor.LockDeleteDirectory(directory);
}
}
bool
UpdateWalk::UpdatePlaylistFile(Directory &directory,
std::string_view name, std::string_view suffix,
const StorageFileInfo &info) noexcept
{
const auto *const plugin = FindPlaylistPluginBySuffix(suffix);
if (plugin == nullptr)
return false;
if (GetPlaylistPluginAsFolder(*plugin))
UpdatePlaylistFile(directory, name, info, *plugin);
PlaylistInfo pi(name, info.mtime);
const ScopeDatabaseLock protect;
if (directory.playlists.UpdateOrInsert(std::move(pi)))
modified = true;
return true;
}
void
UpdateWalk::PurgeDanglingFromPlaylists(Directory &directory) noexcept
{
/* recurse */
for (Directory &child : directory.children)
PurgeDanglingFromPlaylists(child);
if (!directory.IsPlaylist())
/* this check is only for virtual directories
representing a playlist file */
return;
directory.ForEachSongSafe([&](Song &song){
if (!song.target.empty() &&
!PathTraitsUTF8::IsAbsoluteOrHasScheme(song.target.c_str())) {
Song *target = directory.LookupTargetSong(song.target.c_str());
if (target == nullptr) {
/* the target does not exist: remove
the virtual song */
editor.DeleteSong(directory, &song);
modified = true;
} else {
/* the target exists: mark it (for
option "hide_playlist_targets") */
target->in_playlist = true;
}
}
});
}