Adding the 'awesome' window manager to nixos.

I made the system sw path include /etc/xdg - awesome looks for some file
in the XDG_CONFIG_DIRS, which in bashrc is set to point to the profiles/etc/xdg


svn path=/nixos/trunk/; revision=21675

modules/config/system-path.nix

@@ -116,5 +116,5 @@ in
   require = [options];
 
   environment.systemPackages = requiredPackages;
-  environment.pathsToLink = ["/bin" "/sbin" "/lib" "/share/man" "/share/info" "/man" "/info"];
+  environment.pathsToLink = ["/bin" "/sbin" "/lib" "/share/man" "/share/info" "/man" "/info" "/etc/xdg"];
 }

modules/module-list.nix

@@ -124,6 +124,7 @@
   ./services/x11/display-managers/slim.nix
   ./services/x11/hardware/synaptics.nix
   ./services/x11/hardware/wacom.nix
+  ./services/x11/window-managers/awesome.nix
   ./services/x11/window-managers/compiz.nix
   ./services/x11/window-managers/default.nix
   ./services/x11/window-managers/icewm.nix

modules/services/x11/window-managers/awesome.nix

@@ -0,0 +1,42 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+
+  cfg = config.services.xserver.windowManager.awesome;
+
+in
+
+{
+
+  ###### interface
+
+  options = {
+  
+    services.xserver.windowManager.awesome.enable = mkOption {
+      default = false;
+      description = "Enable the Awesome window manager.";
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enable {
+
+    services.xserver.windowManager.session = singleton
+      { name = "awesome";
+        start =
+          ''
+            ${pkgs.awesome}/bin/awesome &
+            waitPID=$!
+          '';
+      };
+
+    environment.x11Packages = [ pkgs.awesome ];
+    
+  };
+
+}