def playlistinfo(context, parameter=None):
"""
*musicpd.org, current playlist section:*
``playlistinfo [[SONGPOS] | [START:END]]``
Displays a list of all songs in the playlist, or if the optional
argument is given, displays information only for the song
``SONGPOS`` or the range of songs ``START:END``.
*ncmpc and mpc:*
- uses negative indexes, like ``playlistinfo "-1"``, to request
the entire playlist
"""
if parameter is None or parameter == '-1':
start, end = 0, None
else:
tracklist_slice = protocol.RANGE(parameter)
start, end = tracklist_slice.start, tracklist_slice.stop
tl_tracks = context.core.tracklist.tl_tracks.get()
if start and start > len(tl_tracks):
raise exceptions.MpdArgError('Bad song index')
if end and end > len(tl_tracks):
end = None
return translator.tracks_to_mpd_format(tl_tracks, start, end)
def test_range(self):
self.assertEqual(slice(1, 2), protocol.RANGE('1'))
self.assertEqual(slice(0, 1), protocol.RANGE('0'))
self.assertEqual(slice(0, None), protocol.RANGE('0:'))
self.assertEqual(slice(1, 3), protocol.RANGE('1:3'))
self.assertRaises(ValueError, protocol.RANGE, '3.14')
self.assertRaises(ValueError, protocol.RANGE, '1:abc')
self.assertRaises(ValueError, protocol.RANGE, 'abc:1')
self.assertRaises(ValueError, protocol.RANGE, '2:1')
self.assertRaises(ValueError, protocol.RANGE, '-1:2')
self.assertRaises(ValueError, protocol.RANGE, '1 : 2')
self.assertRaises(ValueError, protocol.RANGE, '')
self.assertRaises(ValueError, protocol.RANGE, 'true')
self.assertRaises(ValueError, protocol.RANGE, 'false')
self.assertRaises(ValueError, protocol.RANGE, 'abc')
self.assertRaises(ValueError, protocol.RANGE, '12 34')