Enable creation of other config files than init.lua (#246)

wrappers/_shared.nix

@@ -1,10 +1,18 @@
-{
+modules: {
   lib,
   pkgs,
+  config,
   ...
 }: let
   inherit (lib) mkEnableOption mkOption mkOptionType mkForce mkMerge mkIf types;
 in {
+  topLevelModules =
+    [
+      ./modules/output.nix
+      (import ./modules/files.nix (modules pkgs))
+    ]
+    ++ (modules pkgs);
+
   helpers = mkOption {
     type = mkOptionType {
       name = "helpers";
@@ -14,4 +22,16 @@ in {
     description = "Use this option to access the helpers";
     default = import ../plugins/helpers.nix {inherit (pkgs) lib;};
   };
+
+  configFiles = let
+    cfg = config.programs.nixvim;
+  in
+    lib.mapAttrs'
+    (
+      _: file:
+        lib.nameValuePair
+        "nvim/${file.path}"
+        {text = file.content;}
+    )
+    cfg.files;
 }