[beets] Update beets path config

Utilize album fields for special formatting of doujin releases.
Requires a currently unmerged PR to beets.

beetbox/beets#2988

beets/.config/beets/config.yaml

@@ -6,7 +6,8 @@ library: /data/audio/music/sorted/musiclibrary.db
 per_disc_numbering: true
 
 import:
-  move: true
+  copy: true
+  # move: true
   # autotag: false
   log: beetslog.txt
 
@@ -24,33 +25,43 @@ import:
 #     For singles in the context of anime releases.
 #     Can be set to "Opening", "Ending", "Insert", etc.
 #   - touhou:true
-#     If it is a Touhou arrangement.
+#     If it is a Touhou arrangement (disc).
+#   - doujin:true
+#     Released by a doujin circle (usually at some event).
+#   - event:
+#     Event at which the doujin CD was released,
+#     e.g. "M3-41", "C-83", "Reitatsei-7".
+#     Refer to https://vgmdb.net/db/events.php for a reference list.
 
 # https://beets.readthedocs.io/en/stable/reference/pathformat.html
 paths:
-  # $if(%track%,$if($and(%discnumber%,$neql(%totaldiscs%,$num(%discnumber%,1))),$num(%discnumber%,1).,)$num(%track%,2) - ,)$if($and(%albumartist%,$neql(%albumartist%,%artist%)),%artist% - ,)%title%
-  comp: $albumartist/$year - $album%aunique{}/$disc_and_track - $artist - $title
+  # special stuff
+  # TODO anime:true: '#touhou/$album%aunique{}/$disc_and_track - $title'
+  doujin:true: "#%ifdef{touhou,touhou,doujin}\
+    /%if{comp and label,$label,$albumartist}\
+    /$long_date - $album%aunique{}%ifdef{event, [$event]}\
+    /$disc_and_track - $title"
+  # normal stuff
   albumtype:soundtrack: '#soundtrack/%ifdef{source,$source/}$album%aunique{}/$disc_and_track - $title'
-  # source:touhou: '#touhou/$album%aunique{}/$disc_and_track - $title'
-  # anime:true: '#touhou/$album%aunique{}/$disc_and_track - $title'
-  # doujin:true: '#touhou/$album%aunique{}/$disc_and_track - $title'
+  comp: $albumartist/$year - $album%aunique{}/$disc_and_track - $artist - $title
   singleton: $albumartist/$title
   # default: $artist/$title
   default: $albumartist/$year - $album%aunique{}/$disc_and_track - $title
 
+album_fields:
+  long_date: '"-".join(f"{n:02}" for n in [year, month, day] if n)'
+
 item_fields:
-  disc_and_track: >
-    f"{disc}.{track:02}"
-    if disctotal > 1
-    else f"{track:02}"
+  # TODO consider 3-digit tracknumber albums?
+  disc_and_track: f"{disc}.{track:02}" if disctotal > 1 else f"{track:02}"
 
 # https://beets.readthedocs.io/en/latest/plugins/index.html
 plugins: fetchart lastgenre missing duplicates inline
 # chroma embedart convert ftintitle
 
 lastgenre:
-  count: 3
-  separator: "\x00"  # multi-field ID3v2.4 text tags are separated by nulls - http://id3.org/id3v2.4.0-frames section 4.2 | doesn't seem to work out that well?
+  count: 1
+  # separator: "\x00"  # multi-field ID3v2.4 text tags are separated by nulls - http://id3.org/id3v2.4.0-frames section 4.2 | doesn't seem to work out that well?
 
 # disabled, for now
 # ftintitle: