plugins/nvim-cmp: refactoring (init filetype and cmdline options)

plugins/completion/cmp/sources/copilot-cmp.nix

@@ -0,0 +1,66 @@
+{
+  lib,
+  helpers,
+  config,
+  ...
+}:
+with lib; let
+  copilot-lua-cfg = config.plugins.copilot-lua;
+  cfg = config.plugins.copilot-cmp;
+in {
+  options.plugins.copilot-cmp =
+    helpers.neovim-plugin.extraOptionsOptions
+    // {
+      event =
+        helpers.defaultNullOpts.mkNullable
+        (with types; listOf str)
+        ''["InsertEnter" "LspAttach"]''
+        ''
+          Configures when the source is registered.
+          Unless you have a unique problem for your particular configuration you probably don't want
+          to touch this.
+        '';
+
+      fixPairs = helpers.defaultNullOpts.mkBool true ''
+        Suppose you have the following code: `print('h')`.
+        Copilot might try to account for the `'` and `)` and complete it with this: `print('hello`.
+
+        This is not good behavior for consistency reasons and will just end up deleting the two ending
+        characters.
+        This option fixes that.
+        Don't turn this off unless you are having problems with pairs and believe this might be
+        causing them.
+      '';
+    };
+
+  config = mkIf cfg.enable {
+    warnings =
+      optional
+      ((!isBool copilot-lua-cfg.suggestion.enabled) || copilot-lua-cfg.suggestion.enabled)
+      ''
+        It is recommended to disable copilot's `suggestion` module, as it can interfere with
+        completions properly appearing in copilot-cmp.
+      ''
+      ++ optional
+      (
+        (!isBool copilot-lua-cfg.panel.enabled) || copilot-lua-cfg.panel.enabled
+      )
+      ''
+        It is recommended to disable copilot's `panel` module, as it can interfere with completions
+        properly appearing in copilot-cmp.
+      '';
+
+    plugins.copilot-lua.enable = true;
+
+    extraConfigLua = let
+      setupOptions = with cfg;
+        {
+          inherit event;
+          fix_pairs = fixPairs;
+        }
+        // cfg.extraOptions;
+    in ''
+      require('copilot_cmp').setup(${helpers.toLuaObject setupOptions})
+    '';
+  };
+}