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How to amalgamate changes across multiple buffers into a single undo ent
How to amalgamate changes across multiple buffers into a single undo entry
Thu, 23 Jul 2020 06:14:38 +0200 (CEST)
Suppose one action causes a change in two buffers. I'd like a way of performing
an undo operation so that both buffers will be undone at once. But I can't
figure out how to amalgamate the buffer changes properly. This is what I've got:
(defmacro my/with-single-undo (curr-buf &rest body)
"Within CURR-BUF, execute BODY as a single undo step."
(declare (indent 1))
(let ((marker (cl-gensym "marker")))
(nconc (prepare-change-group ,curr-buf)
(prepare-change-group (get-buffer-create "b.txt")))))
(defun my/insert-some-stuff (&rest _args)
(insert "apple banana caterpillar\n")
(with-current-buffer (get-buffer-create "b.txt")
(insert "xylophone yak zebra"))))
I test by making "a.txt" and "b.txt" files, opening both up, and then executing
M-x my/insert-some-stuff from within a.txt. Right now, undo is only undoing
changes within the buffer in which I execute it.
I'd appreciate any help on this.
- How to amalgamate changes across multiple buffers into a single undo entry,
Brian Leung <=