def _create_playlist(context, name, tracks):
"""
Creates new playlist using backend appropriate for the given tracks
"""
uri_schemes = set([urllib.parse.urlparse(t.uri).scheme for t in tracks])
for scheme in uri_schemes:
new_playlist = context.core.playlists.create(name, scheme).get()
if new_playlist is None:
logger.debug(
"Backend for scheme %s can't create playlists", scheme)
continue # Backend can't create playlists at all
new_playlist = new_playlist.replace(tracks=tracks)
saved_playlist = context.core.playlists.save(new_playlist).get()
if saved_playlist is not None:
return # Created and saved
else:
continue # Failed to save using this backend
# Can't use backend appropriate for passed URI schemes, use default one
default_scheme = context.dispatcher.config[
'mpd']['default_playlist_scheme']
new_playlist = context.core.playlists.create(name, default_scheme).get()
if new_playlist is None:
# If even MPD's default backend can't save playlist, everything is lost
logger.warning("MPD's default backend can't create playlists")
raise exceptions.MpdFailedToSavePlaylist(default_scheme)
new_playlist = new_playlist.replace(tracks=tracks)
saved_playlist = context.core.playlists.save(new_playlist).get()
if saved_playlist is None:
uri_scheme = urllib.parse.urlparse(new_playlist.uri).scheme
raise exceptions.MpdFailedToSavePlaylist(uri_scheme)
def rename(context, old_name, new_name):
"""
*musicpd.org, stored playlists section:*
``rename {NAME} {NEW_NAME}``
Renames the playlist ``NAME.m3u`` to ``NEW_NAME.m3u``.
"""
_check_playlist_name(old_name)
_check_playlist_name(new_name)
old_playlist = _get_playlist(context, old_name)
if _get_playlist(context, new_name, must_exist=False):
raise exceptions.MpdExistError('Playlist already exists')
# TODO: should we purge the mapping in an else?
# Create copy of the playlist and remove original
uri_scheme = urllib.parse.urlparse(old_playlist.uri).scheme
new_playlist = context.core.playlists.create(new_name, uri_scheme).get()
new_playlist = new_playlist.replace(tracks=old_playlist.tracks)
saved_playlist = context.core.playlists.save(new_playlist).get()
if saved_playlist is None:
raise exceptions.MpdFailedToSavePlaylist(uri_scheme)
context.core.playlists.delete(old_playlist.uri).get()
def playlistdelete(context, name, songpos):
"""
*musicpd.org, stored playlists section:*
``playlistdelete {NAME} {SONGPOS}``
Deletes ``SONGPOS`` from the playlist ``NAME.m3u``.
"""
_check_playlist_name(name)
uri = context.lookup_playlist_uri_from_name(name)
playlist = uri is not None and context.core.playlists.lookup(uri).get()
if not playlist:
raise exceptions.MpdNoExistError('No such playlist')
try:
# Convert tracks to list and remove requested
tracks = list(playlist.tracks)
tracks.pop(songpos)
except IndexError:
raise exceptions.MpdArgError('Bad song index')
# Replace tracks and save playlist
playlist = playlist.replace(tracks=tracks)
saved_playlist = context.core.playlists.save(playlist).get()
if saved_playlist is None:
raise exceptions.MpdFailedToSavePlaylist(
urllib.parse.urlparse(uri).scheme)
def playlistclear(context, name):
"""
*musicpd.org, stored playlists section:*
``playlistclear {NAME}``
Clears the playlist ``NAME.m3u``.
The playlist will be created if it does not exist.
"""
_check_playlist_name(name)
playlist = _get_playlist(context, name, must_exist=False)
if not playlist:
playlist = context.core.playlists.create(name).get()
# Just replace tracks with empty list and save
playlist = playlist.replace(tracks=[])
if context.core.playlists.save(playlist).get() is None:
raise exceptions.MpdFailedToSavePlaylist(
urllib.parse.urlparse(playlist.uri).scheme)
def playlistmove(context, name, from_pos, to_pos):
"""
*musicpd.org, stored playlists section:*
``playlistmove {NAME} {SONGID} {SONGPOS}``
Moves ``SONGID`` in the playlist ``NAME.m3u`` to the position
``SONGPOS``.
*Clarifications:*
- The second argument is not a ``SONGID`` as used elsewhere in the protocol
documentation, but just the ``SONGPOS`` to move *from*, i.e.
``playlistmove {NAME} {FROM_SONGPOS} {TO_SONGPOS}``.
"""
if from_pos == to_pos:
return
_check_playlist_name(name)
uri = context.lookup_playlist_uri_from_name(name)
playlist = uri is not None and context.core.playlists.lookup(uri).get()
if not playlist:
raise exceptions.MpdNoExistError('No such playlist')
if from_pos == to_pos:
return # Nothing to do
try:
# Convert tracks to list and perform move
tracks = list(playlist.tracks)
track = tracks.pop(from_pos)
tracks.insert(to_pos, track)
except IndexError:
raise exceptions.MpdArgError('Bad song index')
# Replace tracks and save playlist
playlist = playlist.replace(tracks=tracks)
saved_playlist = context.core.playlists.save(playlist).get()
if saved_playlist is None:
raise exceptions.MpdFailedToSavePlaylist(
urllib.parse.urlparse(uri).scheme)
def save(context, name):
"""
*musicpd.org, stored playlists section:*
``save {NAME}``
Saves the current playlist to ``NAME.m3u`` in the playlist
directory.
"""
_check_playlist_name(name)
tracks = context.core.tracklist.get_tracks().get()
playlist = _get_playlist(context, name, must_exist=False)
if not playlist:
# Create new playlist
_create_playlist(context, name, tracks)
else:
# Overwrite existing playlist
new_playlist = playlist.replace(tracks=tracks)
saved_playlist = context.core.playlists.save(new_playlist).get()
if saved_playlist is None:
raise exceptions.MpdFailedToSavePlaylist(
urllib.parse.urlparse(playlist.uri).scheme)