Variable: display-battery-mode-hook

display-battery-mode-hook is a customizable variable defined in battery.el.gz.

Value

nil

Documentation

Hook run after entering or leaving display-battery-mode(var)/display-battery-mode(fun).

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/battery.el.gz
;;;###autoload
(define-minor-mode display-battery-mode
  "Toggle battery status display in mode line (Display Battery mode).

The text displayed in the mode line is controlled by
`battery-mode-line-format' and `battery-status-function'.
The mode line is be updated every `battery-update-interval'
seconds."
  :global t
  (setq battery-mode-line-string "")
  (or global-mode-string (setq global-mode-string '("")))
  (and battery-update-timer (cancel-timer battery-update-timer))
  (battery--upower-unsubscribe)
  (if (and battery-status-function battery-mode-line-format)
      (if (not display-battery-mode)
	  (setq global-mode-string
		(delq 'battery-mode-line-string global-mode-string))
	(add-to-list 'global-mode-string 'battery-mode-line-string t)
        (and (eq battery-status-function #'battery-upower)
             battery-upower-subscribe
             (battery--upower-subscribe))
	(setq battery-update-timer (run-at-time nil battery-update-interval
                                                #'battery-update-handler))
	(battery-update))
    (message "Battery status not available")
    (setq display-battery-mode nil)))