nix-i3-gnome3-excerpt

    services.xserver = {
      enable = true;

_     layout = "us,ru";
      xkbOptions = "eurosign:e, caps:swapescape, grp:win_space_toggle";
      libinput.enable = true;

      displayManager.gdm.enable = true;
      displayManager.gdm.wayland = true;
      displayManager.defaultSession = "none+i3";

      desktopManager = {
        xterm.enable = false;
        gnome3 = {
          enable = true;
        };

      };

      windowManager.i3 = {
        enable = true;
        package = pkgs.i3-gaps;
        extraPackages = with pkgs; [
          i3status # gives you the default i3 status bar
          rofi # dmenu #application launcher most people use
        ];
      };

    };