Initialize nix-darwin config for darwinix

lib/nixos.nix

@@ -80,6 +80,74 @@
       ];
     };
 
+  mkDarwinConfigWithHomeManagerModule = {
+    system,
+    mylib,
+    hostname,
+    username,
+    publicKeys,
+    extraModules ? [],
+  }:
+    inputs.nix-darwin.lib.darwinSystem {
+      inherit system;
+
+      # Values in "specialArgs" are propagated to all system modules.
+      specialArgs = {
+        inherit inputs system hostname mylib username publicKeys;
+      };
+
+      modules = builtins.concatLists [
+        [
+          # Replace the default "pkgs" with my configured version
+          # to allow installation of unfree software and my own overlays.
+          {nixpkgs.pkgs = pkgs;}
+
+          # Import the toplevel system configuration module.
+          ../system/cachix.nix
+
+          # Host specific configuration
+          ../system/${hostname}
+
+          # Import all of my custom system modules
+          # ../system/systemmodules # TODO:
+        ]
+
+        extraModules
+
+        # HM is installed as a system module when using mkNixosConfigWithHomeManagerModule.
+        [
+          inputs.home-manager.darwinModules.home-manager
+          {
+            home-manager = {
+              # Values in "extraSpecialArgs" are propagated to all HM modules.
+              extraSpecialArgs = {
+                inherit inputs system hostname mylib username publicKeys;
+              };
+
+              # Use the "pkgs" from the system configuration.
+              # This disables "nixpkgs.*" options in HM modules.
+              useGlobalPkgs = true;
+
+              # Packages in "users.${username}.packages" will be installed
+              # to /etc/profiles instead of ~/.nix-profile.
+              useUserPackages = true;
+
+              users.${username}.imports = [
+                # Host specific configuration
+                ../home/${username}/${hostname}
+              ];
+
+              sharedModules = [
+                # Import all of my custom HM modules.
+                # Putting them into sharedModules enables correct nixd completions.
+                ../home/homemodules/darwin.nix
+              ];
+            };
+          }
+        ]
+      ];
+    };
+
   mkNixosSystemConfig = {
     system,
     mylib,