{
  config,
  lib,
  ...
}: let
  cfg = config.soispha.locale;
in {
  options.soispha.locale = {
    enable = lib.mkEnableOption (lib.mdDoc "locale");
    keyMap = lib.mkOption {
      type = lib.types.str;
      example = "us";
      default = "dvorak";
    };
  };

  config = lib.mkIf cfg.enable {
    # Set your time zone.
    time.timeZone = "Europe/Berlin";

    # Select internationalisation properties.
    i18n = {
      defaultLocale = "en_CA.UTF-8";
      extraLocaleSettings = {
        LANGUAGE = "en_CA:en_US:en";
        LC_TIME = "en_DK.UTF-8";
        LC_COLLATE = "C.UTF-8";
      };
    };

    # Layout
    console = {
      inherit (cfg) keyMap;
    };
  };
}