anchor.diff:    # List packages installed in system profile. To search by name, run:
     # $ nix-env -qaP | grep wget
     environment.systemPackages =
  -    [ pkgs.vim
  +    [
  +      pkgs.yabai
  +      pkgs.skhd
       ];
   
     # Use a custom configuration.nix location.
  
positive.code:         yabai -m signal --add event=application_terminated action="yabai -m query --windows --window &> /dev/null || yabai -m window --focus mouse"
        '';
      };
  }
  
negative.code:   services.yabai = {
      enable = true;
      package = pkgs.yabai;
      enableScriptingAddition = false;
      config = {
        focus_follows_mouse          = "off";
        mouse_follows_focus          = "off";
        window_placement             = "second_child";
        window_opacity               = "off";
  