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366 lines
13 KiB
EmacsLisp
366 lines
13 KiB
EmacsLisp
;;; battery.el --- display battery status information
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;; Copyright (C) 1997, 1998, 2000, 2001, 2003, 2004, 2005
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;; Free Software Foundation, Inc.
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;; Author: Ralph Schleicher <rs@nunatak.allgaeu.org>
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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 support for interpreting the new `/proc/apm'
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;; file format of Linux version 1.3.58 or newer and for the `/proc/acpi/'
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;; directory structure of Linux 2.4.20 and 2.6.
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;;; Code:
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(require 'timer)
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(eval-when-compile (require 'cl))
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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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((and (eq system-type 'gnu/linux)
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(file-directory-p "/proc/acpi/battery"))
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'battery-linux-proc-acpi))
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"*Function for getting battery status information.
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The function has to return an alist of conversion definitions.
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Its 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 '(choice (const nil) 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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((eq battery-status-function 'battery-linux-proc-acpi)
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"Power %L, battery %B at %r (%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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;;;###autoload (put 'battery-mode-line-string 'risky-local-variable t)
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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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((eq battery-status-function 'battery-linux-proc-acpi)
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"[%b%p%%,%d<>C]"))
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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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(define-minor-mode display-battery-mode
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"Display battery status information in the mode line.
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The text being 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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:global t :group 'battery
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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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(and battery-update-timer (cancel-timer battery-update-timer))
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(if (not display-battery-mode)
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(setq global-mode-string
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(delq 'battery-mode-line-string global-mode-string))
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(add-to-list 'global-mode-string 'battery-mode-line-string t)
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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
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(propertize (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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'help-echo "Battery status information"))
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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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(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 (string-to-number (match-string 3) 16))
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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 (string-to-number (match-string 4) 16))
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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 (string-to-number (match-string 6) 16))
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(if (= tem 255)
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(setq battery-status "N/A")
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(setq tem (string-to-number (match-string 5) 16))
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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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;;; `/proc/acpi/' interface for Linux.
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(defun battery-linux-proc-acpi ()
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"Get ACPI status information from Linux kernel.
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This function works only with the new `/proc/acpi/' format introduced
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in Linux version 2.4.20 and 2.6.0.
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The following %-sequences are provided:
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%c Current capacity (mAh)
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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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%d Temperature (in degrees Celsius)
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%L AC line status (verbose)
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%p battery load percentage
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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 ((design-capacity 0)
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(warn 0)
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(low 0)
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capacity rate rate-type charging-state minutes hours)
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;; ACPI provides information about each battery present in the system in
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;; a separate subdirectory. We are going to merge the available
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;; information together since displaying for a variable amount of
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;; batteries seems overkill for format-strings.
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(with-temp-buffer
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(dolist (dir (ignore-errors (directory-files "/proc/acpi/battery/"
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t "\\`[^.]")))
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(erase-buffer)
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(ignore-errors (insert-file-contents (expand-file-name "state" dir)))
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(when (re-search-forward "present: +yes$" nil t)
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(and (re-search-forward "charging state: +\\(.*\\)$" nil t)
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(member charging-state '("unknown" nil))
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;; On most multi-battery systems, most of the time only one
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;; battery is "charging"/"discharging", the others are
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;; "unknown".
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(setq charging-state (match-string 1)))
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(when (re-search-forward "present rate: +\\([0-9]+\\) \\(m[AW]\\)$"
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nil t)
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(setq rate (+ (or rate 0) (string-to-number (match-string 1)))
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rate-type (or (and rate-type
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(if (string= rate-type (match-string 2))
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rate-type
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(error
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"Inconsistent rate types (%s vs. %s)"
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rate-type (match-string 2))))
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(match-string 2))))
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(when (re-search-forward "remaining capacity: +\\([0-9]+\\) m[AW]h$"
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nil t)
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(setq capacity
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(+ (or capacity 0) (string-to-number (match-string 1))))))
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(goto-char (point-max))
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(ignore-errors (insert-file-contents (expand-file-name "info" dir)))
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(when (re-search-forward "present: +yes$" nil t)
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(when (re-search-forward "design capacity: +\\([0-9]+\\) m[AW]h$"
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nil t)
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(incf design-capacity (string-to-number (match-string 1))))
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(when (re-search-forward
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"design capacity warning: +\\([0-9]+\\) m[AW]h$" nil t)
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(incf warn (string-to-number (match-string 1))))
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(when (re-search-forward "design capacity low: +\\([0-9]+\\) m[AW]h$"
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nil t)
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(incf low (string-to-number (match-string 1)))))))
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(and capacity rate
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(setq minutes (if (zerop rate) 0
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(floor (* (/ (float (if (string= charging-state
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"charging")
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(- design-capacity capacity)
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capacity)) rate) 60)))
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hours (/ minutes 60)))
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(list (cons ?c (or (and capacity (number-to-string capacity)) "N/A"))
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(cons ?L (or (when (file-exists-p "/proc/acpi/ac_adapter/AC/state")
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(with-temp-buffer
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(insert-file-contents
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"/proc/acpi/ac_adapter/AC/state")
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(when (re-search-forward "state: +\\(.*\\)$" nil t)
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(match-string 1))))
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"N/A"))
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(cons ?d (or (when (file-exists-p
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"/proc/acpi/thermal_zone/THRM/temperature")
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(with-temp-buffer
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(insert-file-contents
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"/proc/acpi/thermal_zone/THRM/temperature")
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(when (re-search-forward
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"temperature: +\\([0-9]+\\) C$" nil t)
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(match-string 1))))
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(when (file-exists-p
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"/proc/acpi/thermal_zone/THM/temperature")
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(with-temp-buffer
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(insert-file-contents
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"/proc/acpi/thermal_zone/THM/temperature")
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(when (re-search-forward
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"temperature: +\\([0-9]+\\) C$" nil t)
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(match-string 1))))
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"N/A"))
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(cons ?r (or (and rate (concat (number-to-string rate) " "
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rate-type)) "N/A"))
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(cons ?B (or charging-state "N/A"))
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(cons ?b (or (and (string= charging-state "charging") "+")
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(and (< capacity low) "!")
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(and (< capacity warn) "-")
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""))
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(cons ?h (or (and hours (number-to-string hours)) "N/A"))
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(cons ?m (or (and minutes (number-to-string minutes)) "N/A"))
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(cons ?t (or (and minutes
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(format "%d:%02d" hours (- minutes (* 60 hours))))
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"N/A"))
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(cons ?p (or (and design-capacity capacity
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(number-to-string
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(floor (/ capacity
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(/ (float design-capacity) 100)))))
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"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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(replace-regexp-in-string
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"%."
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(lambda (str)
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(let ((char (aref str 1)))
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(if (eq char ?%) "%"
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(or (cdr (assoc char alist)) ""))))
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format t t))
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(provide 'battery)
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;; arch-tag: 65916f50-4754-4b6b-ac21-0b510f545a37
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;;; battery.el ends here
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