misc: refactor helpers propagation

Co-authored-by: Robert Hensing <robert@roberthensing.nl>

wrappers/hm.nix

@@ -1,6 +1,7 @@
 {
   modules,
   self,
+  getHelpers,
 }: {
   pkgs,
   config,
@@ -8,7 +9,8 @@
   ...
 } @ args: let
   inherit (lib) mkEnableOption mkOption mkOptionType mkMerge mkIf types;
-  shared = import ./_shared.nix modules args;
+  helpers = getHelpers pkgs;
+  shared = import ./_shared.nix {inherit modules helpers;} args;
   cfg = config.programs.nixvim;
   files =
     shared.configFiles
@@ -19,15 +21,20 @@ in {
   options = {
     programs.nixvim = mkOption {
       default = {};
-      type = types.submodule ([
-          {
-            options = {
-              enable = mkEnableOption "nixvim";
-              defaultEditor = mkEnableOption "nixvim as the default editor";
-            };
-          }
-        ]
-        ++ shared.topLevelModules);
+      type = types.submoduleWith {
+        shorthandOnlyDefinesConfig = true;
+        specialArgs.helpers = helpers;
+        modules =
+          [
+            {
+              options = {
+                enable = mkEnableOption "nixvim";
+                defaultEditor = mkEnableOption "nixvim as the default editor";
+              };
+            }
+          ]
+          ++ shared.topLevelModules;
+      };
     };
     nixvim.helpers = shared.helpers;
   };