discogs: artists in "featuring" credits omitted in tagging.

[henry-oberholtzer]

Importing an album using Discogs as the source, with artists in the featuring tag, such as Adam F - Kaos: The Anti-Acoustic Warfare, results in the artists in the featuring field being omitted. I think I saw this mentioned somewhere else in the forum/tickets too, but can't find it again.

Importing the previously mentioned Adam F album gives the following results:

$ beet -vv import 'Adam F - Kaos- The Anti-Acoustic Warfare (2001) {UK - 7243 5 34250 2 9} [CD FLAC]'/ -t
...
...
  Match (98.9%):
  Adam F - Kaos: The Anti-Acoustic Warfare
  ≠ tracks
  Discogs, CD, 2001, Europe, EMI, 7243 5 34250 2 9, None
  https://www.discogs.com/release/62004-Adam-F-Kaos-The-Anti-Acoustic-Warfare
  * Artist: Adam F
  * Album: Kaos: The Anti-Acoustic Warfare
     ≠ (#1) Kaos Main Title (feat. Royal Symphonia) (1:12) -> (#1) Kaos Main Title (1:12)
     ≠ (#2) Smash Sumthin (feat. Redman) (3:28) -> (#2) Smash Sumthin (3:28)
     ≠ (#3) Stand Clear (feat. M.O.P.) (3:59) -> (#3) Stand Clear (3:59)
     ≠ (#4) Listen Here (feat. Capone-N-Noreaga) (5:26) -> (#4) Listen Here (5:26)
     ≠ (#5) Where's My... (feat. Lil' Mo) (3:45) -> (#5) Where's My... (3:45)
     ≠ (#6) Greatest of All Time (feat. LL Cool J) (4:04) -> (#6) Greatest Of All Time (4:04)
     ≠ (#7) News Flash (feat. Huggy Bear) (1:35) -> (#7) News Flash (1:35)
     ≠ (#8) Dirty Harry's Revenge (feat. Beenie Man & Siamese) (3:12) -> (#8) Dirty Harry's Revenge (3:12)
     ≠ (#9) Time 4 Da True (feat. Dave & Pos from De (4:13) -> (#9) Time 4 Da True                             (4:13)
            La Soul and D.V. Alias Khrist)
     ≠ (#10) Karma (Comes Back Around) (feat. Guru & Carl Thomas) (5:23) -> (#10) Karma (Comes Back Around) (5:23)
     ≠ (#11) End of Days Interregnum (0:55) -> (#11) End Of Days Interregnum (0:55)
     ≠ (#12) Last Dayz (feat. Pharoahe Monch) (3:08) -> (#12) Last Dayz (3:08)
➜ [A]pply, More candidates, Skip, Use as-is, as Tracks, Group albums,
Enter search, enter Id, aBort? A
...
...
$~/data/downloads/music$ beet ls 'Adam F'
Adam F - Kaos: The Anti-Acoustic Warfare - Kaos Main Title (2001, EMI)
Adam F - Kaos: The Anti-Acoustic Warfare - Smash Sumthin (2001, EMI)
Adam F - Kaos: The Anti-Acoustic Warfare - Stand Clear (2001, EMI)
Adam F - Kaos: The Anti-Acoustic Warfare - Listen Here (2001, EMI)
Adam F - Kaos: The Anti-Acoustic Warfare - Where's My... (2001, EMI)
Adam F - Kaos: The Anti-Acoustic Warfare - Greatest Of All Time (2001, EMI)
Adam F - Kaos: The Anti-Acoustic Warfare - News Flash (2001, EMI)
Adam F - Kaos: The Anti-Acoustic Warfare - Dirty Harry's Revenge (2001, EMI)
Adam F - Kaos: The Anti-Acoustic Warfare - Time 4 Da True (2001, EMI)
Adam F - Kaos: The Anti-Acoustic Warfare - Karma (Comes Back Around) (2001, EMI)
Adam F - Kaos: The Anti-Acoustic Warfare - End Of Days Interregnum (2001, EMI)
Adam F - Kaos: The Anti-Acoustic Warfare - Last Dayz (2001, EMI)
Adam F - Kaos: The Anti-Acoustic Warfare - Time Is Up Outro (2001, EMI)
Adam F - Kaos: The Anti-Acoustic Warfare - Trans Mission (2001, EMI)

This results in a pretty signifigant loss of tagging information, I think an appropriate solution would be to iterate through the artist / credit list for a track, taking any artists listed as "Featuring" and appending them to the track's artist name. This would work nicely with the ftintitle plugin's expectations and adhere to the MusicBrainz tagging style.

With the example above, after a fix, the Discogs plugin would be able to tag the album as follows:

$~/data/downloads/music$ beet ls 'Adam F'
Adam F feat. Royal Symphonia - Kaos: The Anti-Acoustic Warfare - Kaos Main Title (2001, EMI)
Adam F feat. Redman- Kaos: The Anti-Acoustic Warfare - Smash Sumthin (2001, EMI)
Adam F feat. M.O.P. - Kaos: The Anti-Acoustic Warfare - Stand Clear (2001, EMI)
Adam F feat. Capone-N-Noreaga - Kaos: The Anti-Acoustic Warfare - Listen Here (2001, EMI)
Adam F feat. Lil' Mo - Kaos: The Anti-Acoustic Warfare - Where's My... (2001, EMI)
Adam F feat. LL Cool J - Kaos: The Anti-Acoustic Warfare - Greatest Of All Time (2001, EMI)
Adam F feat. Huggy Bear- Kaos: The Anti-Acoustic Warfare - News Flash (2001, EMI)
Adam F feat. Beenie Man & Siamese - Kaos: The Anti-Acoustic Warfare - Dirty Harry's Revenge (2001, EMI)
Adam F feat. DV Alias Kryst, Dave & Pos- Kaos: The Anti-Acoustic Warfare - Time 4 Da True (2001, EMI)
Adam F feat. Guru - Kaos: The Anti-Acoustic Warfare - Karma (Comes Back Around) (2001, EMI)
Adam F - Kaos: The Anti-Acoustic Warfare - End Of Days Interregnum (2001, EMI)
Adam F feat. Pharoahe Monch - Kaos: The Anti-Acoustic Warfare - Last Dayz (2001, EMI)
Adam F - Kaos: The Anti-Acoustic Warfare - Time Is Up Outro (2001, EMI)
Adam F - Kaos: The Anti-Acoustic Warfare - Trans Mission (2001, EMI)

I'll probably start on a branch to try and address this as well - Discogs generally has more of the releases in my collection that MusicBrainz does at the moment so I've got a bit of a vested interest in getting that plugin doing it's best!