leftwm: enable service

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

@@ -19,6 +19,7 @@ in
     ./herbstluftwm.nix
     ./i3.nix
     ./jwm.nix
+    ./leftwm.nix
     ./metacity.nix
     ./mwm.nix
     ./openbox.nix

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

@@ -0,0 +1,25 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.xserver.windowManager.leftwm;
+in
+{
+  ###### interface
+  options = {
+    services.xserver.windowManager.leftwm.enable = mkEnableOption "leftwm";
+  };
+
+  ###### implementation
+  config = mkIf cfg.enable {
+    services.xserver.windowManager.session = singleton {
+      name = "leftwm";
+      start = ''
+        ${pkgs.leftwm}/bin/leftwm &
+        waitPID=$!
+      '';
+    };
+    environment.systemPackages = [ pkgs.leftwm ];
+  };
+}