1
0
mirror of https://git.savannah.gnu.org/git/emacs.git synced 2024-12-23 10:34:07 +00:00
emacs/lisp/battery.el
Richard M. Stallman 3691e056ac (battery-linux-proc-apm): Re-use the temporary buffer.
(battery-insert-file-contents): Disable code conversion.
1998-03-30 04:39:53 +00:00

294 lines
10 KiB
EmacsLisp
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

;;; battery.el --- display battery status information.
;; Copyright (C) 1997, 1998 Free Software Foundation, Inc.
;; Author: Ralph Schleicher <rs@purple.UL.BaWue.DE>
;; Keywords: hardware
;; This file is part of 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:
;; There is at present only a function interpreting the new `/proc/apm'
;; file format of Linux version 1.3.58 or newer. That is, what a lucky
;; coincidence, exactly the interface provided by the author's labtop.
;;; Code:
(require 'timer)
(defgroup battery nil
"Display battery status information."
:prefix "battery-"
:group 'hardware)
(defcustom battery-status-function
(cond ((and (eq system-type 'gnu/linux)
(file-readable-p "/proc/apm"))
'battery-linux-proc-apm))
"*Function for getting battery status information.
The function have to return an alist of conversion definitions.
Cons cells are of the form
(CONVERSION . REPLACEMENT-TEXT)
CONVERSION is the character code of a \"conversion specification\"
introduced by a `%' character in a control string."
:type 'function
:group 'battery)
(defcustom battery-echo-area-format
(cond ((eq battery-status-function 'battery-linux-proc-apm)
"Power %L, battery %B (%p%% load, remaining time %t)"))
"*Control string formatting the string to display in the echo area.
Ordinary characters in the control string are printed as-is, while
conversion specifications introduced by a `%' character in the control
string are substituted as defined by the current value of the variable
`battery-status-function'."
:type '(choice string (const nil))
:group 'battery)
(defvar battery-mode-line-string nil
"String to display in the mode line.")
(defcustom battery-mode-line-format
(cond ((eq battery-status-function 'battery-linux-proc-apm)
" [%b%p%%]"))
"*Control string formatting the string to display in the mode line.
Ordinary characters in the control string are printed as-is, while
conversion specifications introduced by a `%' character in the control
string are substituted as defined by the current value of the variable
`battery-status-function'."
:type '(choice string (const nil))
:group 'battery)
(defcustom battery-update-interval 60
"*Seconds after which the battery status will be updated."
:type 'integer
:group 'battery)
(defvar battery-update-timer nil
"Interval timer object.")
;;;###autoload
(defun battery ()
"Display battery status information in the echo area.
The text beeing displayed in the echo area is controlled by the variables
`battery-echo-area-format' and `battery-status-function'."
(interactive)
(message "%s" (if (and battery-echo-area-format battery-status-function)
(battery-format battery-echo-area-format
(funcall battery-status-function))
"Battery status not available")))
;;;###autoload
(defun display-battery ()
"Display battery status information in the mode line.
The text beeing displayed in the mode line is controlled by the variables
`battery-mode-line-format' and `battery-status-function'.
The mode line will be updated automatically every `battery-update-interval'
seconds."
(interactive)
(setq battery-mode-line-string "")
(or global-mode-string (setq global-mode-string '("")))
(or (memq 'battery-mode-line-string global-mode-string)
(setq global-mode-string (append global-mode-string
'(battery-mode-line-string))))
(and battery-update-timer (cancel-timer battery-update-timer))
(setq battery-update-timer (run-at-time nil battery-update-interval
'battery-update-handler))
(battery-update))
(defun battery-update-handler ()
(battery-update)
(sit-for 0))
(defun battery-update ()
"Update battery status information in the mode line."
(setq battery-mode-line-string (if (and battery-mode-line-format
battery-status-function)
(battery-format
battery-mode-line-format
(funcall battery-status-function))
""))
(force-mode-line-update))
;;; `/proc/apm' interface for Linux.
(defconst battery-linux-proc-apm-regexp
(concat "^\\([^ ]+\\)" ; Driver version.
" \\([^ ]+\\)" ; APM BIOS version.
" 0x\\([0-9a-f]+\\)" ; APM BIOS flags.
" 0x\\([0-9a-f]+\\)" ; AC line status.
" 0x\\([0-9a-f]+\\)" ; Battery status.
" 0x\\([0-9a-f]+\\)" ; Battery flags.
" \\(-?[0-9]+\\)%" ; Load percentage.
" \\(-?[0-9]+\\)" ; Remaining time.
" \\(.*\\)" ; Time unit.
"$")
"Regular expression matching contents of `/proc/apm'.")
(defun battery-linux-proc-apm ()
"Get APM status information from Linux kernel.
This function works only with the new `/proc/apm' format introduced
in Linux version 1.3.58.
The following %-sequences are provided:
%v Linux driver version
%V APM BIOS version
%I APM BIOS status (verbose)
%L AC line status (verbose)
%B Battery status (verbose)
%b Battery status, empty means high, `-' means low,
`!' means critical, and `+' means charging
%p battery load percentage
%s Remaining time in seconds
%m Remaining time in minutes
%h Remaining time in hours
%t Remaining time in the form `h:min'"
(let (driver-version bios-version bios-interface line-status
battery-status battery-status-symbol load-percentage
seconds minutes hours remaining-time buffer tem)
(unwind-protect
(save-excursion
(setq buffer (get-buffer-create " *battery*"))
(set-buffer buffer)
(erase-buffer)
(battery-insert-file-contents "/proc/apm")
(re-search-forward battery-linux-proc-apm-regexp)
(setq driver-version (match-string 1))
(setq bios-version (match-string 2))
(setq tem (battery-hex-to-int-2 (match-string 3)))
(if (not (logand tem 2))
(setq bios-interface "not supported")
(setq bios-interface "enabled")
(cond ((logand tem 16) (setq bios-interface "disabled"))
((logand tem 32) (setq bios-interface "disengaged")))
(setq tem (battery-hex-to-int-2 (match-string 4)))
(cond ((= tem 0) (setq line-status "off-line"))
((= tem 1) (setq line-status "on-line"))
((= tem 2) (setq line-status "on backup")))
(setq tem (battery-hex-to-int-2 (match-string 6)))
(if (= tem 255)
(setq battery-status "N/A")
(setq tem (battery-hex-to-int-2 (match-string 5)))
(cond ((= tem 0) (setq battery-status "high"
battery-status-symbol ""))
((= tem 1) (setq battery-status "low"
battery-status-symbol "-"))
((= tem 2) (setq battery-status "critical"
battery-status-symbol "!"))
((= tem 3) (setq battery-status "charging"
battery-status-symbol "+")))
(setq load-percentage (match-string 7))
(setq seconds (string-to-number (match-string 8)))
(and (string-equal (match-string 9) "min")
(setq seconds (* 60 seconds)))
(setq minutes (/ seconds 60)
hours (/ seconds 3600))
(setq remaining-time
(format "%d:%02d" hours (- minutes (* 60 hours))))))))
(list (cons ?v (or driver-version "N/A"))
(cons ?V (or bios-version "N/A"))
(cons ?I (or bios-interface "N/A"))
(cons ?L (or line-status "N/A"))
(cons ?B (or battery-status "N/A"))
(cons ?b (or battery-status-symbol ""))
(cons ?p (or load-percentage "N/A"))
(cons ?s (or (and seconds (number-to-string seconds)) "N/A"))
(cons ?m (or (and minutes (number-to-string minutes)) "N/A"))
(cons ?h (or (and hours (number-to-string hours)) "N/A"))
(cons ?t (or remaining-time "N/A")))))
;;; Private functions.
(defun battery-format (format alist)
"Substitute %-sequences in FORMAT."
(let ((index 0)
(length (length format))
(result "")
char flag elem)
(while (< index length)
(setq char (aref format index))
(if (not flag)
(if (char-equal char ?%)
(setq flag t)
(setq result (concat result (char-to-string char))))
(cond ((char-equal char ?%)
(setq result (concat result "%")))
((setq elem (assoc char alist))
(setq result (concat result (cdr elem)))))
(setq flag nil))
(setq index (1+ index)))
(or (null flag)
(setq result (concat result "%")))
result))
(defun battery-insert-file-contents (file-name)
"Insert contents of file FILE-NAME after point.
FILE-NAME can be a non-ordinary file, for example, a named pipe.
Return t if file exists."
(let ((load-read-function 'battery-read-function)
(load-source-file-function nil)
(load-path '("."))
(load-history nil))
(save-excursion
(load file-name nil t t))))
(defun battery-read-function (&optional stream)
"Function for reading expressions from STREAM.
Value is always nil."
(let (char)
(while (not (< (setq char (get-file-char)) 0))
(insert char))))
(defconst battery-hex-map '((?0 . 0) (?1 . 1) (?2 . 2) (?3 . 3)
(?4 . 4) (?5 . 5) (?6 . 6) (?7 . 7)
(?8 . 8) (?9 . 9) (?a . 10) (?b . 11)
(?c . 12) (?d . 13) (?e . 14) (?f . 15)))
(defun battery-hex-to-int (string)
"Convert a hexadecimal number (a string) into a number."
(save-match-data
(and (string-match "^[ \t]+" string)
(setq string (substring string (match-end 0))))
(and (string-match "^0[xX]" string)
(setq string (substring string (match-end 0)))))
(battery-hex-to-int-2 string))
(defun battery-hex-to-int-2 (string)
(let ((index 0)
(length (length string))
(value 0)
(elem nil))
(while (and (< index length)
(setq elem (assoc (downcase (aref string index))
battery-hex-map)))
(setq value (+ (* 16 value) (cdr elem))
index (1+ index)))
value))
(provide 'battery)
;;; battery.el ends here