add xmonad

modules/desktop/xmonad/default.nix

@@ -0,0 +1,26 @@
+{ outputs, options, config, lib, pkgs, ...}:
+with lib;
+let
+  cfg = config.modules.desktop.xmonad;
+in
+{
+  options.modules.desktop.xmoad = {
+    enable = mkEnableOption false;
+  };
+
+  config = mkIf cfg.enable {
+  # https://nixos.wiki/wiki/XMonad
+    services.xserver = {
+      enable = true;
+      windowManager.xmonad = {
+        enable = true;
+        enableContribAndExtras = true;
+            ghcArgs = [
+      "-hidir /tmp" # place interface files in /tmp, otherwise ghc tries to write them to the nix store
+      "-odir /tmp" # place object files in /tmp, otherwise ghc tries to write them to the nix store
+      "-i${xmonad-contexts}" # tell ghc to search in the respective nix store path for the module
+    ];
+      };
+    };
+  };
+}