{ ... }:
{
  perSystem =
    { pkgs, ... }:
    {
      packages.menu =
        (
          if pkgs.stdenv.hostPlatform.isDarwin then
            (pkgs.writeShellApplication {
              name = "menu";
              runtimeInputs = [
                pkgs.choose-gui
                pkgs.fzf
              ];
              text = builtins.readFile ./menu-darwin.sh;
            })
          else if pkgs.stdenv.hostPlatform.isLinux then
            (pkgs.writeShellApplication {
              name = "menu";
              runtimeInputs = [
                pkgs.rofi
                pkgs.wofi
                pkgs.fzf
              ];
              text = builtins.readFile ./menu-linux.sh;
            })
          else
            throw "unsupported system"
        ).overrideAttrs
          { passthru.usage = builtins.readFile ./usage.kdl; };
    };
}