[widgets.mpd] Add fields ${Artists} and ${Genres}

[toniz4]

Resolves GH-116

Adds new return values to widgets.mpd that concatenate all artists and generes when there's more than one. For tracks with vorbis metadata.

I've also updated the docs to reflect those changes.

[McSinyx]

The patchset looks good to me, aside from some minor formatting issues. After you're done resolving them, could you please test if both Artists and Genres are working?

[toniz4]

The patchset looks good to me, aside from some minor formatting issues. After you're done resolving them, could you please test if both Artists and Genres are working?

Genres was broken before because of the typo, but now It's working fine:

Here's the output:

The update function:

local update = function (widget, args)
   if args["{state}"] == "Stop" then
      widget.visible = false
      return ''
   else
      widget.visible = true
      return {
          ('Artists: %s Track: %s Genres: %s'):format(args["{Artists}"], args["{Title}"], args["{Genres}"]),
         args["{state}"]
      }
   end
end

And what mpd is returning:

$ printf 'password ""\nstatus\ncurrentsong\nclose \n' | curl --connect-timeout 1 -fsm 3 telnet://127.0.0.1:6600
OK MPD 0.23.5
ACK [3@0] {password} incorrect password
volume: 100
repeat: 0
random: 0
single: 0
consume: 0
partition: default
playlist: 1537
playlistlength: 192
mixrampdb: 0
state: play
song: 182
songid: 1556
time: 284:321
elapsed: 284.284
bitrate: 1221
duration: 320.625
audio: 44100:16:2
nextsong: 183
nextsongid: 1557
OK
file: Parannoul/Parannoul - To See the Next Part of the Dream/01 - Beautiful World.flac
Last-Modified: 2023-02-20T06:28:07Z
Format: 44100:16:2
Title: Beautiful World
Artist: Parannoul
Album: To See the Next Part of the Dream
AlbumArtist: Parannoul
Track: 1
Disc: 1
Genre: Asian Music
Genre: K-Pop
Date: 2021-04-19
Time: 321
duration: 320.625
Pos: 182
Id: 1556
OK

More than one artist it's working as expected too:

$ printf 'password ""\nstatus\ncurrentsong\nclose \n' | curl --connect-timeout 1 -fsm 3 telnet://127.0.0.1:6600
OK MPD 0.23.5
ACK [3@0] {password} incorrect password
volume: 100
repeat: 0
random: 0
single: 0
consume: 0
partition: default
playlist: 1740
playlistlength: 202
mixrampdb: 0
state: play
song: 193
songid: 1759
time: 75:152
elapsed: 74.878
bitrate: 507
duration: 152.000
audio: 44100:16:2
nextsong: 194
nextsongid: 1760
OK
file: ceo@business.net - incentivize unpaid overtime/02 - buttercup.flac
Last-Modified: 2023-02-19T21:45:43Z
Format: 44100:16:2
Title: buttercup
Artist: ceo@business.net
Artist: lentra
Album: incentivize unpaid overtime
AlbumArtist: ceo@business.net
AlbumArtist: lentra
Track: 2
Disc: 1
Genre: Rap/Hip Hop
Date: 2020-02-21
Time: 152
duration: 152.000
Pos: 193
Id: 1759
OK

Here I couldn't find any tracks that have multiples of other tags, not being genre, artist or albumArtist. So just concatenating Artist and Genre it's fine IMO.

[McSinyx]

Thanks, I will merge and tag a new release this weekend.