diff options
Diffstat (limited to 'lisp/simple.el')
| -rw-r--r-- | lisp/simple.el | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/lisp/simple.el b/lisp/simple.el index 3c9e8c72428..9f1bde393ee 100644 --- a/lisp/simple.el +++ b/lisp/simple.el @@ -1484,6 +1484,17 @@ is not *inside* the region START...END." (t '(0 . 0))) '(0 . 0))) + +;; When the first undo batch in an undo list is longer than undo-outer-limit, +;; this function gets called to ask the user what to do. +;; Garbage collection is inhibited around the call, +;; so it had better not do a lot of consing. +(setq undo-outer-limit-function 'undo-outer-limit-truncate) +(defun undo-outer-limit-truncate (size) + (if (yes-or-no-p (format "Buffer %s undo info is %d bytes long; discard it? " + (buffer-name) size)) + (progn (setq buffer-undo-list nil) t) + nil)) (defvar shell-command-history nil "History list for some commands that read shell commands.") |