How to make xscreensaver lock screen when laptop lid closed?

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1

xscreensaver says

If your system has systemd (1) 221 or newer, then closing the lid of your laptop will cause the screen to lock immediately.

I have in home-manager

xscreensaver = {
  enable = true;
  settings = {lock = true;};
}

It installs xscreensaver and locks automatically after a few minutes, but it doesn’t lock automatically when I close the laptop lid. How can I make it do that?

Using nixos unstable, lightdm, picom, qtile.

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2

I made a custom service on the main config for this. Maybe there is a better way, but works for now:

    lock-before-sleeping = {
      restartIfChanged = false;
      unitConfig = {
        Description = "Helper service to bind locker to sleep.target";
      };
      serviceConfig = {
        ExecStart = "${pkgs.slock}/bin/slock";
        Type = "simple";
      };
      before = [
        "pre-sleep.service"
      ];
      wantedBy= [
        "pre-sleep.service"
      ];
      environment = {
        DISPLAY = ":0";
        XAUTHORITY = "/home/gurkan/.Xauthority";
      };
    };
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