[github-copilot] Make commit message generation opt-in

Author: bcc32

layers/+web-services/github-copilot/README.org

@@ -49,6 +49,11 @@ be necessary to add the new binding manually. Details for this can be found [[ht
 
 For the chat interface a separate login procedure will be necessary once a chat is started.
 
+To enable automatic generation of git commit messages using
+copilot-chat, set the layer variable
+=github-copilot-enable-commit-messages= to t.  Alternatively, you can
+invoke =SPC SPC copilot-chat-insert-commit-message= manually.
+
 * Key bindings
 ** General
 

layers/+web-services/github-copilot/config.el

@@ -0,0 +1,21 @@
+;;; config.el --- github-copilot layer configuration file for Spacemacs  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2025  Aaron Zeng
+
+;; Author: Aaron Zeng <[email protected]>
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+(defvar github-copilot-enable-commit-messages nil
+  "If non-nil, automatically generate commit messages (for magit) using Copilot.")

layers/+web-services/github-copilot/packages.el

@@ -42,12 +42,14 @@
 (defun github-copilot/init-copilot-chat ()
   "Initialize the `copilot-chat' package and set up keybindings."
   (use-package copilot-chat
-    :hook (git-commit-setup . copilot-chat-insert-commit-message)
     :defer t
     :init
     ;; Provide our transient state in the AI menu
     (spacemacs/declare-prefix "$" "AI")
     (spacemacs/set-leader-keys "$c" 'copilot-chat-transient)
+    (when github-copilot-enable-commit-messages
+      (add-hook 'git-commit-setup-hook
+                #'copilot-chat-insert-commit-message))
     :config
     ;; Make sure that standard ,, works as confirm in the chat window
     (evil-define-key 'normal copilot-chat-prompt-mode-map ",," #'copilot-chat-prompt-send)