Modularize dev/unity3d.nix

modules/dev/default.nix

@@ -14,7 +14,7 @@
     ./python.nix
     ./rust.nix
     ./scala.nix
-    # ./unity3d.nix
+    ./unity3d.nix
     # ./zsh.nix
   ];
 

modules/dev/unity3d.nix

@@ -2,9 +2,19 @@
 #
 # I don't use Unity often, but when I do, it's in a team or with students.
 
-{ pkgs, ... }:
+{ config, options, lib, pkgs, ... }:
+with lib;
 {
+  options.modules.dev.unity3d = {
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+    };
+  };
+
+  config = mkIf config.modules.dev.unity3d.enable {
     my.packages = with pkgs; [
       unity3d
     ];
+  };
 }