home-manager/modules/services/xscreensaver.nix

{ config, lib, pkgs, ... }:

with lib;

let

  cfg = config.services.xscreensaver;

in

{
  meta.maintainers = [ maintainers.rycee ];

  options = {
    services.xscreensaver = {
      enable = mkEnableOption "XScreenSaver";

      settings = mkOption {
        type = with types; attrsOf (either bool (either int str));
        default = {};
        example = {
          mode = "blank";
          lock = false;
          fadeTicks = 20;
        };
        description = ''
          The settings to use for XScreenSaver.
        '';
      };
    };
  };

  config = mkIf cfg.enable {
    # To make the xscreensaver-command tool available.
    home.packages = [ pkgs.xscreensaver ];

    xresources.properties =
      mapAttrs' (n: nameValuePair "xscreensaver.${n}") cfg.settings;

    systemd.user.services.xscreensaver = {
        Unit = {
          Description = "XScreenSaver";
          After = [ "graphical-session-pre.target" ];
          PartOf = [ "graphical-session.target" ];
        };

        Service = {
          ExecStart = "${pkgs.xscreensaver}/bin/xscreensaver -no-splash";
        };

        Install = {
          WantedBy = [ "graphical-session.target" ];
        };
    };
  };
}