nimdow: Add nixos windowmanager option

nixos/doc/manual/release-notes/rl-2305.section.md

@@ -69,6 +69,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - [sharing](https://github.com/parvardegr/sharing), a command-line tool to share directories and files from the CLI to iOS and Android devices without the need of an extra client app. Available as [programs.sharing](#opt-programs.sharing.enable).
 
+- [nimdow](https://github.com/avahe-kellenberger/nimdow), a window manager written in Nim, inspired by dwm.
+
 ## Backward Incompatibilities {#sec-release-23.05-incompatibilities}
 
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->

nixos/modules/module-list.nix

@@ -1273,6 +1273,7 @@
   ./services/x11/window-managers/bspwm.nix
   ./services/x11/window-managers/katriawm.nix
   ./services/x11/window-managers/metacity.nix
+  ./services/x11/window-managers/nimdow.nix
   ./services/x11/window-managers/none.nix
   ./services/x11/window-managers/twm.nix
   ./services/x11/window-managers/windowlab.nix

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

@@ -0,0 +1,23 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.xserver.windowManager.nimdow;
+in
+{
+  options = {
+    services.xserver.windowManager.nimdow.enable = mkEnableOption (lib.mdDoc "nimdow");
+  };
+
+  config = mkIf cfg.enable {
+    services.xserver.windowManager.session = singleton {
+      name = "nimdow";
+      start = ''
+        ${pkgs.nimdow}/bin/nimdow &
+        waitPID=$!
+      '';
+    };
+    environment.systemPackages = [ pkgs.nimdow ];
+  };
+}