{lib, ...}: let
  inherit (lib) mkOption strings;
  inherit (lib.attrsets) filterAttrs mapAttrsToList;
  inherit (lib.types) bool;
in rec {
  disabled = {enable = false;};
  enabled = {enable = true;};
  ifThenElse = cond: t: f:
    if cond
    then t
    else f;
  mkOpt = type: default: description:
    mkOption {inherit type default description;};
  mkOpt' = type: default: mkOpt type default null;
  mkBoolOpt = mkOpt bool;
  mkBoolOpt' = mkOpt' bool;
  mkPxeMenu = args:
    ''
      UI menu.c32
      TIMEOUT 300
    ''
    + strings.concatStringsSep "\n" (mapAttrsToList
      (
        name: value: ''
          LABEL ${name}
            MENU LABEL ${value.content.label}
            KERNEL ${value.content.kernel}
            append ${value.content.append}
        ''
      )
      (filterAttrs (_: v: v.condition) args));
}