This partly reverts "beac2e8 mpd: Use file:// URIs in tag_cache" by removing
the "file://" URI scheme and the music dir base path from the "file:" fields in
the tag cache.
The advantage is that the tag cache becomes independent of the music dir
location and the tag cache loader can be made compatible with both old and new
tag caches.
file:// URIs are uriencoded, and will thus conserve the encoding of the file
paths. We cannot just convert file paths in other encodings to UTF-8, because
then we won't find the files we point to.
Thus the cpid and cpids kwargs can be removed, and lots of code doing
formatting of MPD responses can be simplified. This also reduces the
need for making full copies of the current playlist, which improves
performance.
stack trace:
Traceback (most recent call last):
File ./scan, line 27, in <module>
for a in tracks_to_tag_cache_format(tracks):
File /home/martins/source/mopidy/mopidy/frontends/mpd/translator.py, line 138, in tracks_to_tag_cache_format
_add_to_tag_cache(result, *tracks_to_directory_tree(tracks))
File /home/martins/source/mopidy/mopidy/frontends/mpd/translator.py, line 151, in _add_to_tag_cache
_add_to_tag_cache(result, *entry)
File /home/martins/source/mopidy/mopidy/frontends/mpd/translator.py, line 156, in _add_to_tag_cache
track_result = dict(track_to_mpd_format(track))
File /home/martins/source/mopidy/mopidy/frontends/mpd/translator.py, line 28, in track_to_mpd_format
('Artist', artists_to_mpd_format(track.artists)),
File /home/martins/source/mopidy/mopidy/frontends/mpd/translator.py, line 88, in artists_to_mpd_format
return u', '.join([a.name for a in artists if a])
TypeError: sequence item 0: expected string or Unicode, NoneType found
