xserver: qtile as windowManager

nixos/modules/services/x11/window-managers/default.nix

···
     ./windowmaker.nix
     ./wmii.nix
     ./xmonad.nix
+    ./qtile.nix
     ./none.nix ];
 
   options = {

nixos/modules/services/x11/window-managers/qtile.nix

···
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.xserver.windowManager.qtile;
+in
+
+{
+  options = {
+    services.xserver.windowManager.qtile.enable = mkEnableOption "qtile";
+  };
+
+  config = mkIf cfg.enable {
+    services.xserver.windowManager.session = [{
+      name = "qtile";
+      start = ''
+        ${pkgs.qtile}/bin/qtile
+        waitPID=$!
+      '';
+    }];
+    
+    environment.systemPackages = [ pkgs.qtile ];
+  };
+}