Make emacs next-buffer skip *Messages* buffer

Question

I'd like to make a simple change to Emacs so that the next-buffer and previous-buffer commands (which I have bound to C-x <RIGHT> and C-x <LEFT> will skip over the *Messages* buffer.

I'm using Emacs 24 and the Emacs Starter Kit.

I've read the following related questions and answers, but they are not what I want:

• Buffer cycling in Emacs: avoiding scratch and Messages buffer
• Emacs disable *Messages* buffer
• Emacs Lisp Buffer out of focus function?

Here are some of the reasons why they don't work:

• I'd like to keep it as simple as possible. Fewer configuration changes are better.
• I don't want to kill or prevent *Messages* altogether.
• (add-to-list 'ido-ignore-buffers "^\*Messages\*" helps with my C-x b (ido-switch-buffer) but does not change how next-buffer and previous-buffer behave.

Answer 1

The simplest I can think of is defining an advice for both functions. Here it is for next-buffer. Similarly would be for previous-buffer. You can also define a configuration variable to enable/disable the behavior (or activating/deactivating the advice):

(defadvice next-buffer (after avoid-messages-buffer-in-next-buffer)
  "Advice around `next-buffer' to avoid going into the *Messages* buffer."
  (when (string= "*Messages*" (buffer-name))
    (next-buffer)))

;; activate the advice
(ad-activate 'next-buffer)

Maybe you can compare buffers in some other way instead of its string name, but that will work. The code for previous buffer is almost the same. I don't know either if there is a way of calling the original function without triggering the advice once inside the advice itself, but again, the code will work even if the name of the buffer is tested afterwards (will fail if you just have one buffer, and it is the messages buffer; some code can check if there is just one buffer and don't call next-buffer again).

If you want to use a standalone function that does the same thing:

(defun my-next-buffer ()
  "next-buffer, only skip *Messages*"
  (interactive)
  (next-buffer)
  (when (string= "*Messages*" (buffer-name))
      (next-buffer)))

(global-set-key [remap next-buffer] 'my-next-buffer)
(global-set-key [remap previous-buffer] 'my-next-buffer)

Answer 2

This way you can avoid the infinite loop:

(defun next-code-buffer ()
  (interactive)
  (let (( bread-crumb (buffer-name) ))
    (next-buffer)
    (while
        (and
         (string-match-p "^\*" (buffer-name))
         (not ( equal bread-crumb (buffer-name) )) )
      (next-buffer))))
(global-set-key [remap next-buffer] 'next-code-buffer)

This code loops over non-starred buffers ("^\*"). For your case (only avoid *Messages*) it would be:

(defun next-code-buffer ()
  (interactive)
  (let (( bread-crumb (buffer-name) ))
    (next-buffer)
    (while
        (and
         (equal "*Messages*" (buffer-name))
         (not ( equal bread-crumb (buffer-name) )) )
      (next-buffer))))
(global-set-key [remap next-buffer] 'next-code-buffer)

You can write previous-code-buffer just replacing every next-buffer with previous-buffer.

Answer 3

This is what I'm using, based on Diego's answer:

(setq skippable-buffers '("*Messages*" "*scratch*" "*Help*"))

(defun my-next-buffer ()
  "next-buffer that skips certain buffers"
  (interactive)
  (next-buffer)
  (while (member (buffer-name) skippable-buffers)
    (next-buffer)))

(defun my-previous-buffer ()
  "previous-buffer that skips certain buffers"
  (interactive)
  (previous-buffer)
  (while (member (buffer-name) skippable-buffers)
    (previous-buffer)))

(global-set-key [remap next-buffer] 'my-next-buffer)
(global-set-key [remap previous-buffer] 'my-previous-buffer)

It is not great yet, because it will hang if there are no buffers other than the skippable-buffers I list. I use C-g to break out of the loop when it happens as a hackaround.

Answer 4

As RubenCaro's answer points out, the other answers can enter infinite loops. I thought David James' approach of a skippable buffers list was a bit nicer, though, so here's a variant of that.

(setq my-skippable-buffers '("*Messages*" "*scratch*" "*Help*"))

(defun my-change-buffer (change-buffer)
  "Call CHANGE-BUFFER until current buffer is not in `my-skippable-buffers'."
  (let ((initial (current-buffer)))
    (funcall change-buffer)
    (let ((first-change (current-buffer)))
      (catch 'loop
        (while (member (buffer-name) my-skippable-buffers)
          (funcall change-buffer)
          (when (eq (current-buffer) first-change)
            (switch-to-buffer initial)
            (throw 'loop t)))))))

(defun my-next-buffer ()
  "`next-buffer' that skips `my-skippable-buffers'."
  (interactive)
  (my-change-buffer 'next-buffer))

(defun my-previous-buffer ()
  "`previous-buffer' that skips `my-skippable-buffers'."
  (interactive)
  (my-change-buffer 'previous-buffer))

(global-set-key [remap next-buffer] 'my-next-buffer)
(global-set-key [remap previous-buffer] 'my-previous-buffer)