Variable: auto-save-mode-hook

auto-save-mode-hook is a customizable variable defined in simple.el.gz.

Value

nil

Documentation

Hook run after entering or leaving auto-save-mode.

No problems result if this variable is not bound. add-hook automatically binds it. (This is true for all hook variables.)

Source Code

;; Defined in /usr/src/emacs/lisp/simple.el.gz
(define-minor-mode auto-save-mode
  "Toggle auto-saving in the current buffer (Auto Save mode).

When this mode is enabled, Emacs periodically saves each file-visiting
buffer in a separate \"auto-save file\".  This is a safety measure to
prevent you from losing more than a limited amount of work if the
system crashes.

Auto-saving does not alter the file visited by the buffer: the visited
file is changed only when you request saving it explicitly (such as
with \\[save-buffer]).  If you want to save the buffer into its
visited files automatically, use \\[auto-save-visited-mode]).

For more details, see Info node `(emacs) Auto Save'."
  :variable ((and buffer-auto-save-file-name
                  ;; If auto-save is off because buffer has shrunk,
                  ;; then toggling should turn it on.
                  (>= buffer-saved-size 0))
             . (lambda (val)
                 (setq buffer-auto-save-file-name
                       (cond
                        ((null val) nil)
                        ((and buffer-file-name auto-save-visited-file-name
                              (not buffer-read-only))
                         buffer-file-name)
                        (t (make-auto-save-file-name))))))
  ;; If -1 was stored here, to temporarily turn off saving,
  ;; turn it back on.
  (and (< buffer-saved-size 0)
       (setq buffer-saved-size 0)))