plugins/nvim-cmp: fix crates-nvim source plugin

plugins/completion/nvim-cmp/sources/crates-nvim.nix

@@ -0,0 +1,17 @@
+{
+  config,
+  lib,
+  ...
+}:
+with lib; let
+  cfg = config.plugins.crates-nvim;
+  helpers = import ../../../helpers.nix {inherit lib;};
+in {
+  options.plugins.crates-nvim = helpers.extraOptionsOptions;
+
+  config = mkIf cfg.enable {
+    extraConfigLua = ''
+      require('crates').setup(${helpers.toLuaObject cfg.extraOptions})
+    '';
+  };
+}

plugins/completion/nvim-cmp/sources/default.nix

@@ -12,6 +12,7 @@ in {
   imports =
     [
       ./cmp-tabnine.nix
+      ./crates-nvim.nix
     ]
     ++ pluginModules;
 }