Re: Visiting buffers programmatically

[Jean Louis <bugs@gnu.support>]

The previous one was repetitive, here is shorter version:

(defvar rcd-switch-to-buffer-list '("*scratch*" "*shell*" "*Messages*"))

(defun rcd-switch-to-buffer ()
  (interactive)
  (let ((buffers (mapcar (lambda (buffer) (get-buffer buffer)) rcd-switch-to-buffer-list)))
    (if (member (current-buffer) buffers)
	(when (buffer-live-p (next-circular-list-item buffers (current-buffer)))
	  (switch-to-buffer 
	   (next-circular-list-item buffers (current-buffer))))
      (when (buffer-live-p (get-buffer (nth 0 rcd-switch-to-buffer-list)))
	(switch-to-buffer (nth 0 rcd-switch-to-buffer-list))))))

and you need this one:

(defun next-circular-list-item (list previous-item)
  "Return the next element in the LIST by looking at PREVIOUS-ITEM.

All elements in the LIST have to be different.

If last element of LIST is equal to PREVIOUS-ITEM then first element is returned."
  (let ((last-element (car (last list))))
    (cond ((eq last-element previous-item) (car list))
	  (t (nth 1 (member previous-item list))))))

-- 
Jean

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