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feat(:term): confine undo to comint/eshell prompts

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Otherwise, undo could delete entire chunks of a shell buffer. This
addresses the issue in eshell, comint shells, and derivatives (like
ielm, shell, or inferior-* shells).

Ref: #8410
This commit is contained in:
Henrik Lissner
2025-06-30 20:54:21 +02:00
parent 1b125ddf7b
commit 5a690fc54f
2 changed files with 22 additions and 9 deletions
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17
modules/term/eshell/config.el
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@ -85,15 +85,14 @@ You should use `set-eshell-alias!' to change this.")
(add-hook 'eshell-mode-hook #'+eshell-init-h)
(add-hook 'eshell-exit-hook #'+eshell-cleanup-h)
;; UX: Temporarily disable undo history between command executions. Undo can
;; destroy output while it's being printed to stdout.
(let (old-undo-list)
(add-hook! 'eshell-pre-command-hook
(setq old-undo-list buffer-undo-list
buffer-undo-list nil))
(add-hook! 'eshell-post-command-hook
(setq buffer-undo-list old-undo-list)
(clrhash undo-equiv-table)))
;; UX: Temporarily disable undo history between command executions. Otherwise,
;; undo could destroy output while it's being printed or delete buffer
;; contents past the boundaries of the current prompt.
(add-hook 'eshell-pre-command-hook #'buffer-disable-undo)
(add-hook! 'eshell-post-command-hook
(defun +eshell--enable-undo-h ()
(buffer-enable-undo (current-buffer))
(setq buffer-undo-list nil)))
;; UX: Prior output in eshell buffers should be read-only. Otherwise, it's
;; trivial to make edits in visual modes (like evil's or term's