feat: TabNine and Copilot assistants

modules/assistant/copilot.nix

@@ -0,0 +1,24 @@
+{
+  pkgs,
+  config,
+  lib,
+  ...
+}:
+with lib;
+with builtins; let
+  cfg = config.vim.assistant.copilot;
+in {
+  options.vim.assistant.copilot = {
+    enable = mkEnableOption "Enable GitHub Copilot";
+  };
+
+  config = mkIf cfg.enable {
+    vim.startPlugins = ["copilot-lua"];
+
+    vim.luaConfigRC.copilot = nvim.dag.entryAnywhere ''
+      require("copilot").setup({
+        -- available options: https://github.com/zbirenbaum/copilot.lua
+      })
+    '';
+  };
+}