Re: Is there equivalent C-l for columns?

[Emanuel Berg <incal@dataswamp.org>]

Jean Louis wrote:

>> Seems it already has been invented:
>> `w3m-horizontal-recenter' in w3m and
>> `gnus-horizontal-recenter' in Gnus. The w3m command seems
>> to work fine, the Gnus command doesn't do anything for me.
>
> I wish it would work, and I tried it.
>
> Gnus one I cannot find after loading gnus library.

It is in gnus-util.el, line 567-590:

(defun gnus-horizontal-recenter ()
  "Recenter the current buffer horizontally."
  (if (< (current-column) (/ (window-width) 2))
      (set-window-hscroll (gnus-get-buffer-window (current-buffer) t) 0)
    (let* ((orig (point))
	   (end (window-end (gnus-get-buffer-window (current-buffer) t)))
	   (max 0))
      (when end
	;; Find the longest line currently displayed in the window.
	(goto-char (window-start))
	(while (and (not (eobp))
		    (< (point) end))
	  (end-of-line)
	  (setq max (max max (current-column)))
	  (forward-line 1))
	(goto-char orig)
	;; Scroll horizontally to center (sort of) the point.
	(if (> max (window-width))
	    (set-window-hscroll
	     (gnus-get-buffer-window (current-buffer) t)
	     (min (- (current-column) (/ (window-width) 3))
		  (+ 2 (- max (window-width)))))
	  (set-window-hscroll (gnus-get-buffer-window (current-buffer) t) 0))
	max))))

To be Gnus a pretty short function LOL :)

  GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
  3.24.24, cairo version 1.16.0) of 2022-05-28
  [commit 79ae40c8e4dac5898d68c92f26f625ac400b960c]

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