{
  config,
  lib,
  pkgs,
  ...
}:
# rofi as the desktop launcher and dmenu-style menu frontend.
let
  # A session menu built on the same themed rofi, so the power actions look
  # like every other menu the launcher drives.
  powerMenu = pkgs.writeShellScript "rofi-power-menu" ''
    chosen=$(printf '%s\n' Lock Suspend 'Log out' Reboot 'Shut down' \
      | ${lib.getExe pkgs.rofi} -dmenu -i -p Power)
    case "$chosen" in
      Lock) ${lib.getExe' pkgs.systemd "loginctl"} lock-session ;;
      Suspend) ${lib.getExe' pkgs.systemd "systemctl"} suspend ;;
      'Log out') ${lib.getExe' pkgs.systemd "loginctl"} terminate-session "$XDG_SESSION_ID" ;;
      Reboot) ${lib.getExe' pkgs.systemd "systemctl"} reboot ;;
      'Shut down') ${lib.getExe' pkgs.systemd "systemctl"} poweroff ;;
    esac
  '';
in
{
  options.modules.desktop.session.rofi.enable = lib.mkEnableOption "the rofi launcher";

  config = lib.mkIf config.modules.desktop.session.rofi.enable {
    home-manager.users.${config.user.name} = hm: {
      # Stylix supplies the Nord theme.
      programs.rofi = {
        enable = true;

        # Application launch is the only mode, kept minimal so the prompt opens
        # as fast as rofi can read the desktop entries.
        # Icons are off: resolving one per entry is the bulk of drun's startup.
        extraConfig = {
          modi = "drun";
          show-icons = false;
        };

        theme.window = {
          border = hm.config.lib.formats.rasi.mkLiteral "2px";
          border-color = hm.config.lib.formats.rasi.mkLiteral "#FFFFFF";
        };
      };
    };

    registry.keybind.${config.networking.hostName} = {
      rofi-launcher = {
        keys = "SUPER + R";
        action = {
          kind = "exec";
          command = "${lib.getExe pkgs.rofi} -show drun";
        };
      };

      rofi-power-menu = {
        keys = "SUPER + SHIFT + X";
        action = {
          kind = "exec";
          command = "${powerMenu}";
        };
      };
    };
  };
}