nixos-config/home-manager/roles/beets.nix

{
  pkgs,
  config,
  ...
}: {
  xdg.configFile."beets/config.yaml".text = builtins.toJSON {
    directory = config.services.mpd.musicDirectory;
    import.move = true;
    paths = {
      default = "$genre/%the{$albumartist}/$album%aunique{}/$track. $title";
      singleton = "$genre/%the{$artist}/singles/$title";
      comp = "$genre/%the{$artist}/$album%aunique{}/$track. $title";
      "genre:soundtrack" = "Soundtrack/$album%aunique{}/$track. $title";
      "genre::classical" = "$genre/%the{$composer}/$album%aunique{}/$track. $title";
    };
    plugins = "convert web mpdstats mpdupdate fromfilename the duplicates missing";
    convert = {
      auto = true;
      command = "${pkgs.ffmpeg}/bin/ffmpeg -i $source -y -vn -acodec libopus -ab 192k $dest";
      extension = "opus";
      never_convert_lossy_files = true;
    };
  };
  systemd.user.services.beets-mpdstats = {
    Unit.Description = "beets.io mpdstats recorder";
    Install.WantedBy = ["default.target"];
    Service = {
      ExecStart = "${pkgs.beets}/bin/beet mpdstats";
      Restart = "always";
    };
  };
}