nixos/modules/common/utilities/yubikey-manager.nix

{ config, pkgs, lib, ... }:
{
  options = {
    yubikey = {
      enable = lib.mkEnableOption {
        description = "Enable yubikey utilities";
        default = false;
      };
    };
  };
  config = lib.mkIf (config.yubikey.enable)
    (
      lib.mkMerge [
        (
          lib.mkIf (config.gui.enable) {
            home-manager.users.${config.user} = {
              home.packages = [
                pkgs.yubikey-manager-qt
                pkgs.yubikey-manager
              ];
            };
          }
        )
        (
          lib.mkIf (!config.gui.enable) {
            home-manager.users.${config.user} = {
              home.packages = [
                pkgs.yubikey-manager
              ];
            };
          }
        )
      ]
    );
}