{  lib, pkgs, ... }:

with lib;

let

  name = "lock";

  # desktop file
  # ------------
  # makes it possible to be used by other programs
  desktopFile =
    pkgs.writeTextFile {
      name        = "${name}.desktop" ;
      destination = "/share/applications/${name}.desktop";
      text        = ''
        [Desktop Entry]
        Categories=Application;Utility;
        Comment=Screen Saver
        Encoding=UTF-8
        Exec=${lockProgram}/bin/${name}
        Icon=gnome-lockscreen
        Name=${name}
        Terminal=false
        Type=Application
      '';
    };

  # the lock program
  lockProgram =
    pkgs.writeShellScriptBin "${name}" ''
      ${pkgs.xlockmore}/bin/xlock -mode life1d -size 1
    '';

in {

  environment.systemPackages = [
    lockProgram
    desktopFile
  ];
}