darwin-battery.el

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darwin-battery.el

Joe Corneli
;;; darwin-battery.el --- echo battery percent remaining under darwin

;; Copyright (C) 2005 Joe Corneli <[hidden email]>

;; Time-stamp: <jac -- Tue Aug 23 01:30:57 CDT 2005>

;; This file is not part of GNU Emacs, but it is distributed under
;; the same terms as GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published
;; by the Free Software Foundation; either version 2, or (at your
;; option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; `battery' from battery.el seems to be broken for Darwin users.
;; This displays the basic data (percent of battery life remaining).

;;; Code:

(defun darwin-battery ()
  (interactive)
  (let* ((batdat (shell-command-to-string
                  "/usr/sbin/ioreg -p IODeviceTree -n \"battery\" -w 0 | grep IOBatteryInfo"))
         (current (with-temp-buffer (insert batdat)
                                    (goto-char (point-min))
                                    (search-forward-regexp "\"Current\"=\\([0-9]*\\)")
                                    (string-to-int (match-string 1))))
         (capacity (with-temp-buffer (insert batdat)
                                     (goto-char (point-min))
                                     (search-forward-regexp "\"Capacity\"=\\([0-9]*\\)")
                                     (string-to-int (match-string 1)))))
    (message "%d%%" (* (/ (float current) capacity) 100))))

(defalias 'battery 'darwin-battery)

;;; darwin-battery.el ends here


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