When I quit ediff with q I get asked if I really want to quit. I'd rather it quit immediately. There is nothing obvious under customization. There is a solution here which seems to work by redefining the q key, but I'm not sure of the details of how the function works. What's the simplest way to get quit to really mean quit?


You can advise ediff-quit so it dynamically rebinds y-or-n-p to a function that returns t.

(defun disable-y-or-n-p (orig-fun &rest args)
  (cl-letf (((symbol-function 'y-or-n-p) (lambda (prompt) t)))
    (apply orig-fun args)))

(advice-add 'ediff-quit :around #'disable-y-or-n-p)

This is more robust to upstream changes than redefining ediff-quit.

  • If it would notify that if any differed buffer changed, it would be perfect.
    – CodyChan
    Oct 17 '16 at 3:36

Unfortunately I think you do have to either rebind q or adjust the source of ediff-quit. As is apparent in the source of ediff-quit the prompt always happens.

(defun ediff-quit (reverse-default-keep-variants)
  "Finish an Ediff session and exit Ediff.
Unselects the selected difference, if any, restores the read-only and modified
flags of the compared file buffers, kills Ediff buffers for this session
\(but not buffers A, B, C\).

If `ediff-keep-variants' is nil, the user will be asked whether the buffers
containing the variants should be removed \(if they haven't been modified\).
If it is t, they will be preserved unconditionally.  A prefix argument,
temporarily reverses the meaning of this variable."
  (interactive "P")
  (let ((ctl-buf (current-buffer))
    (ctl-frm (selected-frame))
    (minibuffer-auto-raise t))
    (if (y-or-n-p (format "Quit this Ediff session%s? "
              (if (ediff-buffer-live-p ediff-meta-buffer)
                  " & show containing session group" "")))
      (message "")
      (set-buffer ctl-buf)
      (ediff-really-quit reverse-default-keep-variants))
      (select-frame ctl-frm)
      (raise-frame ctl-frm)
      (message ""))))

I would suggest redefining ediff-quit in your .emacs and submitting a patch to the source adding a customization variable.

Remember that the implementation source in emacs is always a few keystrokes away. Presuming the elisp sources are installed, type C-h f, enter the function name and follow the link to where it is defined.


I use the following rebind of q in ediff. If any of the buffers are modified, it asks if they are to be saved, then it just quits. If no buffers are modified, it just quits.

(add-hook 'ediff-startup-hook
          (lambda ()
            (local-set-key (kbd"q") 'my-ediff-quit)))

(defun my-ediff-quit ()
  "If any of the ediff buffers have been modified, ask if changes
should be saved. Then quit ediff normally, without asking for
  (let* ((buf-a ediff-buffer-A)
         (buf-b ediff-buffer-B)
         (buf-c ediff-buffer-C)
         (ctl-buf (current-buffer))
         (modified (remove-if-not 'buffer-modified-p
                                  (list buf-a buf-b buf-c))))
    (let ((save (if modified (yes-or-no-p "Save changes?")nil)))
      (loop for buf in modified do
              (set-buffer buf)
              (if save
                (set-buffer-modified-p nil))))
      (set-buffer ctl-buf)
      (ediff-really-quit nil))))

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.