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294 lines
10 KiB
EmacsLisp
294 lines
10 KiB
EmacsLisp
;;; battery.el --- display battery status information.
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;; Copyright (C) 1997, 1998 Free Software Foundation, Inc.
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;; Author: Ralph Schleicher <rs@purple.UL.BaWue.DE>
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;; Keywords: hardware
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; There is at present only a function interpreting the new `/proc/apm'
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;; file format of Linux version 1.3.58 or newer. That is, what a lucky
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;; coincidence, exactly the interface provided by the author's labtop.
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;;; Code:
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(require 'timer)
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(defgroup battery nil
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"Display battery status information."
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:prefix "battery-"
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:group 'hardware)
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(defcustom battery-status-function
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(cond ((and (eq system-type 'gnu/linux)
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(file-readable-p "/proc/apm"))
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'battery-linux-proc-apm))
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"*Function for getting battery status information.
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The function have to return an alist of conversion definitions.
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Cons cells are of the form
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(CONVERSION . REPLACEMENT-TEXT)
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CONVERSION is the character code of a \"conversion specification\"
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introduced by a `%' character in a control string."
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:type 'function
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:group 'battery)
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(defcustom battery-echo-area-format
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(cond ((eq battery-status-function 'battery-linux-proc-apm)
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"Power %L, battery %B (%p%% load, remaining time %t)"))
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"*Control string formatting the string to display in the echo area.
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Ordinary characters in the control string are printed as-is, while
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conversion specifications introduced by a `%' character in the control
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string are substituted as defined by the current value of the variable
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`battery-status-function'."
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:type '(choice string (const nil))
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:group 'battery)
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(defvar battery-mode-line-string nil
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"String to display in the mode line.")
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(defcustom battery-mode-line-format
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(cond ((eq battery-status-function 'battery-linux-proc-apm)
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" [%b%p%%]"))
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"*Control string formatting the string to display in the mode line.
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Ordinary characters in the control string are printed as-is, while
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conversion specifications introduced by a `%' character in the control
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string are substituted as defined by the current value of the variable
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`battery-status-function'."
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:type '(choice string (const nil))
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:group 'battery)
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(defcustom battery-update-interval 60
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"*Seconds after which the battery status will be updated."
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:type 'integer
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:group 'battery)
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(defvar battery-update-timer nil
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"Interval timer object.")
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;;;###autoload
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(defun battery ()
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"Display battery status information in the echo area.
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The text being displayed in the echo area is controlled by the variables
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`battery-echo-area-format' and `battery-status-function'."
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(interactive)
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(message "%s" (if (and battery-echo-area-format battery-status-function)
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(battery-format battery-echo-area-format
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(funcall battery-status-function))
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"Battery status not available")))
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;;;###autoload
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(defun display-battery ()
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"Display battery status information in the mode line.
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The text beeing displayed in the mode line is controlled by the variables
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`battery-mode-line-format' and `battery-status-function'.
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The mode line will be updated automatically every `battery-update-interval'
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seconds."
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(interactive)
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(setq battery-mode-line-string "")
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(or global-mode-string (setq global-mode-string '("")))
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(or (memq 'battery-mode-line-string global-mode-string)
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(setq global-mode-string (append global-mode-string
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'(battery-mode-line-string))))
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(and battery-update-timer (cancel-timer battery-update-timer))
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(setq battery-update-timer (run-at-time nil battery-update-interval
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'battery-update-handler))
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(battery-update))
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(defun battery-update-handler ()
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(battery-update)
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(sit-for 0))
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(defun battery-update ()
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"Update battery status information in the mode line."
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(setq battery-mode-line-string (if (and battery-mode-line-format
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battery-status-function)
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(battery-format
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battery-mode-line-format
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(funcall battery-status-function))
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""))
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(force-mode-line-update))
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;;; `/proc/apm' interface for Linux.
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(defconst battery-linux-proc-apm-regexp
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(concat "^\\([^ ]+\\)" ; Driver version.
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" \\([^ ]+\\)" ; APM BIOS version.
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" 0x\\([0-9a-f]+\\)" ; APM BIOS flags.
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" 0x\\([0-9a-f]+\\)" ; AC line status.
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" 0x\\([0-9a-f]+\\)" ; Battery status.
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" 0x\\([0-9a-f]+\\)" ; Battery flags.
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" \\(-?[0-9]+\\)%" ; Load percentage.
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" \\(-?[0-9]+\\)" ; Remaining time.
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" \\(.*\\)" ; Time unit.
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"$")
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"Regular expression matching contents of `/proc/apm'.")
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(defun battery-linux-proc-apm ()
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"Get APM status information from Linux kernel.
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This function works only with the new `/proc/apm' format introduced
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in Linux version 1.3.58.
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The following %-sequences are provided:
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%v Linux driver version
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%V APM BIOS version
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%I APM BIOS status (verbose)
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%L AC line status (verbose)
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%B Battery status (verbose)
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%b Battery status, empty means high, `-' means low,
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`!' means critical, and `+' means charging
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%p battery load percentage
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%s Remaining time in seconds
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%m Remaining time in minutes
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%h Remaining time in hours
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%t Remaining time in the form `h:min'"
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(let (driver-version bios-version bios-interface line-status
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battery-status battery-status-symbol load-percentage
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seconds minutes hours remaining-time buffer tem)
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(unwind-protect
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(save-excursion
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(setq buffer (get-buffer-create " *battery*"))
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(set-buffer buffer)
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(erase-buffer)
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(battery-insert-file-contents "/proc/apm")
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(re-search-forward battery-linux-proc-apm-regexp)
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(setq driver-version (match-string 1))
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(setq bios-version (match-string 2))
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(setq tem (battery-hex-to-int-2 (match-string 3)))
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(if (not (logand tem 2))
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(setq bios-interface "not supported")
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(setq bios-interface "enabled")
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(cond ((logand tem 16) (setq bios-interface "disabled"))
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((logand tem 32) (setq bios-interface "disengaged")))
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(setq tem (battery-hex-to-int-2 (match-string 4)))
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(cond ((= tem 0) (setq line-status "off-line"))
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((= tem 1) (setq line-status "on-line"))
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((= tem 2) (setq line-status "on backup")))
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(setq tem (battery-hex-to-int-2 (match-string 6)))
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(if (= tem 255)
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(setq battery-status "N/A")
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(setq tem (battery-hex-to-int-2 (match-string 5)))
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(cond ((= tem 0) (setq battery-status "high"
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battery-status-symbol ""))
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((= tem 1) (setq battery-status "low"
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battery-status-symbol "-"))
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((= tem 2) (setq battery-status "critical"
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battery-status-symbol "!"))
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((= tem 3) (setq battery-status "charging"
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battery-status-symbol "+")))
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(setq load-percentage (match-string 7))
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(setq seconds (string-to-number (match-string 8)))
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(and (string-equal (match-string 9) "min")
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(setq seconds (* 60 seconds)))
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(setq minutes (/ seconds 60)
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hours (/ seconds 3600))
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(setq remaining-time
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(format "%d:%02d" hours (- minutes (* 60 hours))))))))
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(list (cons ?v (or driver-version "N/A"))
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(cons ?V (or bios-version "N/A"))
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(cons ?I (or bios-interface "N/A"))
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(cons ?L (or line-status "N/A"))
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(cons ?B (or battery-status "N/A"))
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(cons ?b (or battery-status-symbol ""))
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(cons ?p (or load-percentage "N/A"))
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(cons ?s (or (and seconds (number-to-string seconds)) "N/A"))
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(cons ?m (or (and minutes (number-to-string minutes)) "N/A"))
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(cons ?h (or (and hours (number-to-string hours)) "N/A"))
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(cons ?t (or remaining-time "N/A")))))
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;;; Private functions.
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(defun battery-format (format alist)
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"Substitute %-sequences in FORMAT."
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(let ((index 0)
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(length (length format))
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(result "")
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char flag elem)
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(while (< index length)
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(setq char (aref format index))
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(if (not flag)
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(if (char-equal char ?%)
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(setq flag t)
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(setq result (concat result (char-to-string char))))
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(cond ((char-equal char ?%)
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(setq result (concat result "%")))
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((setq elem (assoc char alist))
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(setq result (concat result (cdr elem)))))
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(setq flag nil))
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(setq index (1+ index)))
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(or (null flag)
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(setq result (concat result "%")))
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result))
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(defun battery-insert-file-contents (file-name)
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"Insert contents of file FILE-NAME after point.
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FILE-NAME can be a non-ordinary file, for example, a named pipe.
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Return t if file exists."
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(let ((load-read-function 'battery-read-function)
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(load-source-file-function nil)
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(load-path '("."))
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(load-history nil))
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(save-excursion
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(load file-name nil t t))))
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(defun battery-read-function (&optional stream)
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"Function for reading expressions from STREAM.
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Value is always nil."
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(let (char)
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(while (not (< (setq char (get-file-char)) 0))
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(insert char))))
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(defconst battery-hex-map '((?0 . 0) (?1 . 1) (?2 . 2) (?3 . 3)
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(?4 . 4) (?5 . 5) (?6 . 6) (?7 . 7)
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(?8 . 8) (?9 . 9) (?a . 10) (?b . 11)
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(?c . 12) (?d . 13) (?e . 14) (?f . 15)))
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(defun battery-hex-to-int (string)
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"Convert a hexadecimal number (a string) into a number."
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(save-match-data
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(and (string-match "^[ \t]+" string)
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(setq string (substring string (match-end 0))))
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(and (string-match "^0[xX]" string)
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(setq string (substring string (match-end 0)))))
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(battery-hex-to-int-2 string))
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(defun battery-hex-to-int-2 (string)
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(let ((index 0)
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(length (length string))
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(value 0)
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(elem nil))
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(while (and (< index length)
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(setq elem (assoc (downcase (aref string index))
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battery-hex-map)))
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(setq value (+ (* 16 value) (cdr elem))
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index (1+ index)))
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value))
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(provide 'battery)
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;;; battery.el ends here
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