GNU bug report logs - #65380
[PATCH] Add command to copy contents in a diff-mode buffer

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From: Gregory Heytings <gregory <at> heytings.org>
To: Jim Porter <jporterbugs <at> gmail.com>
Cc: 65380 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>, Philip Kaludercic <philipk <at> posteo.net>
Subject: bug#65380: [PATCH] Add command to copy contents in a diff-mode buffer
Date: Sun, 20 Aug 2023 23:39:09 +0000

>> Yeah, the question then is: should it be new kill/copy commands or a 
>> new yank command?
>
> I would do something else: a command to move the killed rectangle to the 
> kill-ring.  And perhaps a command to do the opposite: transform the last 
> item of the kill-ring into a killed rectangle.
>

And here are the two commands I had in mind:

(defun move-killed-rectangle-to-kill-ring ()
  "Move the killed rectangle to the `kill-ring'."
  (interactive)
  (if killed-rectangle
      (with-temp-buffer
	(while killed-rectangle
	  (insert-for-yank (car killed-rectangle))
	  (insert "\n")
	  (setq killed-rectangle (cdr killed-rectangle)))
	(kill-ring-save (point-min) (point-max)))
    (user-error "No killed rectangle")))

(defun copy-last-kill-to-killed-rectangle ()
  "Transform the current item of `kill-ring' into a killed rectangle"
  (interactive)
  (with-temp-buffer
    (let ((max -1))
      (insert-for-yank (current-kill 0 t))
      (goto-char (point-min))
      (while (not (eobp))
	(move-end-of-line nil)
	(let ((col (current-column)))
	  (when (> col max)
	    (setq max col)))
	(forward-line 1))
      (let ((col (current-column)))
	(when (< col max)
	  (insert (make-string (- max col) ? ))))
    (kill-rectangle (point-min) (point-max)))))

WDYT?

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