final: prev: {
  chrysalis = let
    pname = "chrysalis";
    version = "0.11.8";
    name = "${pname}-${version}-binary";
  in
    prev.appimageTools.wrapAppImage rec {
      inherit name;

      src = prev.appimageTools.extract {
        inherit name;
        src = prev.fetchurl {
          url = "https://github.com/keyboardio/${pname}/releases/download/v${version}/${pname}-${version}.AppImage";
          sha256 = "sha256-yyb6sRCPjHCK0tkuHTffw2NkZHcqw9tIdHbbBiKLGu8=";
        };
      };

      multiPkgs = null;
      extraPkgs = p:
        (prev.appimageTools.defaultFhsEnvArgs.multiPkgs p)
        ++ [
          p.glib
        ];

      # Also expose the udev rules here, so it can be used as:
      #   services.udev.packages = [ pkgs.chrysalis ];
      # to allow non-root modifications to the keyboards.

      extraInstallCommands = ''
        mv $out/bin/${name} $out/bin/${pname}
        mkdir -p $out/lib/udev/rules.d
        ln -s \
          --target-directory=$out/lib/udev/rules.d \
          ${src}/resources/static/udev/60-kaleidoscope.rules
      '';
    };
}