feat: apply new module format to snippet plugins

modules/snippets/default.nix

@@ -1,10 +1,5 @@
-{
-  pkgs,
-  lib,
-  config,
-  ...
-}: {
+_: {
   imports = [
-    ./vsnip.nix
+    ./vsnip
   ];
 }

modules/snippets/vsnip/config.nix

@@ -0,0 +1,14 @@
+{
+  pkgs,
+  config,
+  lib,
+  ...
+}:
+with lib;
+with builtins; let
+  cfg = config.vim.snippets.vsnip;
+in {
+  config = mkIf cfg.enable {
+    vim.startPlugins = ["vim-vsnip"];
+  };
+}

modules/snippets/vsnip/default.nix

@@ -0,0 +1,5 @@
+_: {
+  imports = [
+    ./vsnip.nix
+  ];
+}

modules/snippets/vsnip/vsnip.nix

@@ -11,8 +11,4 @@ in {
   options.vim.snippets.vsnip = {
     enable = mkEnableOption "Enable vim-vsnip";
   };
-
-  config = mkIf cfg.enable {
-    vim.startPlugins = ["vim-vsnip"];
-  };
 }