lisp/battery.el

   1 ;;; battery.el --- display battery status information
   2
   3 ;; Copyright (C) 1997, 1998, 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   5
   6 ;; Author: Ralph Schleicher <rs@nunatak.allgaeu.org>
   7 ;; Keywords: hardware
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 3, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24 ;; Boston, MA 02110-1301, USA.
  25
  26 ;;; Commentary:
  27
  28 ;; There is at present support for GNU/Linux and OS X.  This library
  29 ;; supports both the `/proc/apm' file format of Linux version 1.3.58
  30 ;; or newer and the `/proc/acpi/' directory structure of Linux 2.4.20
  31 ;; and 2.6.  Darwin (OS X) is supported by using the `pmset' program.
  32
  33 ;;; Code:
  34
  35 (require 'timer)
  36 (eval-when-compile (require 'cl))
  37
  38 \f
  39 (defgroup battery nil
  40   "Display battery status information."
  41   :prefix "battery-"
  42   :group 'hardware)
  43
  44 (defcustom battery-status-function
  45   (cond ((and (eq system-type 'gnu/linux)
  46               (file-readable-p "/proc/apm"))
  47          'battery-linux-proc-apm)
  48         ((and (eq system-type 'gnu/linux)
  49               (file-directory-p "/proc/acpi/battery"))
  50          'battery-linux-proc-acpi)
  51         ((and (eq system-type 'darwin)
  52               (condition-case nil
  53                   (with-temp-buffer
  54                     (and (eq (call-process "pmset" nil t nil "-g" "ps") 0)
  55                          (> (buffer-size) 0)))
  56                 (error nil)))
  57          'battery-pmset))
  58   "*Function for getting battery status information.
  59 The function has to return an alist of conversion definitions.
  60 Its cons cells are of the form
  61
  62     (CONVERSION . REPLACEMENT-TEXT)
  63
  64 CONVERSION is the character code of a \"conversion specification\"
  65 introduced by a `%' character in a control string."
  66   :type '(choice (const nil) function)
  67   :group 'battery)
  68
  69 (defcustom battery-echo-area-format
  70   (cond ((eq battery-status-function 'battery-linux-proc-apm)
  71          "Power %L, battery %B (%p%% load, remaining time %t)")
  72         ((eq battery-status-function 'battery-linux-proc-acpi)
  73          "Power %L, battery %B at %r (%p%% load, remaining time %t)")
  74         ((eq battery-status-function 'battery-pmset)
  75          "%L power, battery %B (%p%% load, remaining time %t)"))
  76   "*Control string formatting the string to display in the echo area.
  77 Ordinary characters in the control string are printed as-is, while
  78 conversion specifications introduced by a `%' character in the control
  79 string are substituted as defined by the current value of the variable
  80 `battery-status-function'.  Here are the ones generally available:
  81 %c Current capacity (mAh or mWh)
  82 %r Current rate of charge or discharge
  83 %B Battery status (verbose)
  84 %b Battery status: empty means high, `-' means low,
  85    `!' means critical, and `+' means charging
  86 %d Temperature (in degrees Celsius)
  87 %L AC line status (verbose)
  88 %p Battery load percentage
  89 %m Remaining time (to charge or discharge) in minutes
  90 %h Remaining time (to charge or discharge) in hours
  91 %t Remaining time (to charge or discharge) in the form `h:min'"
  92   :type '(choice string (const nil))
  93   :group 'battery)
  94
  95 (defvar battery-mode-line-string nil
  96   "String to display in the mode line.")
  97 ;;;###autoload (put 'battery-mode-line-string 'risky-local-variable t)
  98
  99 (defcustom battery-mode-line-format
 100   (cond ((eq battery-status-function 'battery-linux-proc-apm)
 101          "[%b%p%%]")
 102         ((eq battery-status-function 'battery-linux-proc-acpi)
 103          "[%b%p%%,%d°C]")
 104         ((eq battery-status-function 'battery-pmset)
 105          "[%b%p%%]"))
 106   "*Control string formatting the string to display in the mode line.
 107 Ordinary characters in the control string are printed as-is, while
 108 conversion specifications introduced by a `%' character in the control
 109 string are substituted as defined by the current value of the variable
 110 `battery-status-function'.  Here are the ones generally available:
 111 %c Current capacity (mAh or mWh)
 112 %r Current rate of charge or discharge
 113 %B Battery status (verbose)
 114 %b Battery status: empty means high, `-' means low,
 115    `!' means critical, and `+' means charging
 116 %d Temperature (in degrees Celsius)
 117 %L AC line status (verbose)
 118 %p Battery load percentage
 119 %m Remaining time (to charge or discharge) in minutes
 120 %h Remaining time (to charge or discharge) in hours
 121 %t Remaining time (to charge or discharge) in the form `h:min'"
 122   :type '(choice string (const nil))
 123   :group 'battery)
 124
 125 (defcustom battery-update-interval 60
 126   "*Seconds after which the battery status will be updated."
 127   :type 'integer
 128   :group 'battery)
 129
 130 (defcustom battery-load-low 25
 131   "*Upper bound of low battery load percentage.
 132 A battery load percentage below this number is considered low."
 133   :type 'integer
 134   :group 'battery)
 135
 136 (defcustom battery-load-critical 10
 137   "*Upper bound of critical battery load percentage.
 138 A battery load percentage below this number is considered critical."
 139   :type 'integer
 140   :group 'battery)
 141
 142 (defvar battery-update-timer nil
 143   "Interval timer object.")
 144
 145 ;;;###autoload
 146 (defun battery ()
 147   "Display battery status information in the echo area.
 148 The text being displayed in the echo area is controlled by the variables
 149 `battery-echo-area-format' and `battery-status-function'."
 150   (interactive)
 151   (message "%s" (if (and battery-echo-area-format battery-status-function)
 152                     (battery-format battery-echo-area-format
 153                                     (funcall battery-status-function))
 154                   "Battery status not available")))
 155
 156 ;;;###autoload
 157 (define-minor-mode display-battery-mode
 158   "Display battery status information in the mode line.
 159 The text being displayed in the mode line is controlled by the variables
 160 `battery-mode-line-format' and `battery-status-function'.
 161 The mode line will be updated automatically every `battery-update-interval'
 162 seconds."
 163   :global t :group 'battery
 164   (setq battery-mode-line-string "")
 165   (or global-mode-string (setq global-mode-string '("")))
 166   (and battery-update-timer (cancel-timer battery-update-timer))
 167   (if (not display-battery-mode)
 168       (setq global-mode-string
 169             (delq 'battery-mode-line-string global-mode-string))
 170     (add-to-list 'global-mode-string 'battery-mode-line-string t)
 171     (setq battery-update-timer (run-at-time nil battery-update-interval
 172                                             'battery-update-handler))
 173     (battery-update)))
 174
 175 (defun battery-update-handler ()
 176   (battery-update)
 177   (sit-for 0))
 178
 179 (defun battery-update ()
 180   "Update battery status information in the mode line."
 181   (setq battery-mode-line-string
 182         (propertize (if (and battery-mode-line-format
 183                              battery-status-function)
 184                         (battery-format
 185                          battery-mode-line-format
 186                          (funcall battery-status-function))
 187                       "")
 188                     'help-echo "Battery status information"))
 189   (force-mode-line-update))
 190
 191 \f
 192 ;;; `/proc/apm' interface for Linux.
 193
 194 (defconst battery-linux-proc-apm-regexp
 195   (concat "^\\([^ ]+\\)"                ; Driver version.
 196           " \\([^ ]+\\)"                ; APM BIOS version.
 197           " 0x\\([0-9a-f]+\\)"          ; APM BIOS flags.
 198           " 0x\\([0-9a-f]+\\)"          ; AC line status.
 199           " 0x\\([0-9a-f]+\\)"          ; Battery status.
 200           " 0x\\([0-9a-f]+\\)"          ; Battery flags.
 201           " \\(-?[0-9]+\\)%"            ; Load percentage.
 202           " \\(-?[0-9]+\\)"             ; Remaining time.
 203           " \\(.*\\)"                   ; Time unit.
 204           "$")
 205   "Regular expression matching contents of `/proc/apm'.")
 206
 207 (defun battery-linux-proc-apm ()
 208   "Get APM status information from Linux kernel.
 209 This function works only with the new `/proc/apm' format introduced
 210 in Linux version 1.3.58.
 211
 212 The following %-sequences are provided:
 213 %v Linux driver version
 214 %V APM BIOS version
 215 %I APM BIOS status (verbose)
 216 %L AC line status (verbose)
 217 %B Battery status (verbose)
 218 %b Battery status, empty means high, `-' means low,
 219    `!' means critical, and `+' means charging
 220 %p Battery load percentage
 221 %s Remaining time (to charge or discharge) in seconds
 222 %m Remaining time (to charge or discharge) in minutes
 223 %h Remaining time (to charge or discharge) in hours
 224 %t Remaining time (to charge or discharge) in the form `h:min'"
 225   (let (driver-version bios-version bios-interface line-status
 226         battery-status battery-status-symbol load-percentage
 227         seconds minutes hours remaining-time tem)
 228     (with-temp-buffer
 229       (ignore-errors (insert-file-contents "/proc/apm"))
 230       (when (re-search-forward battery-linux-proc-apm-regexp)
 231         (setq driver-version (match-string 1))
 232         (setq bios-version (match-string 2))
 233         (setq tem (string-to-number (match-string 3) 16))
 234         (if (not (logand tem 2))
 235             (setq bios-interface "not supported")
 236           (setq bios-interface "enabled")
 237           (cond ((logand tem 16) (setq bios-interface "disabled"))
 238                 ((logand tem 32) (setq bios-interface "disengaged")))
 239           (setq tem (string-to-number (match-string 4) 16))
 240           (cond ((= tem 0) (setq line-status "off-line"))
 241                 ((= tem 1) (setq line-status "on-line"))
 242                 ((= tem 2) (setq line-status "on backup")))
 243           (setq tem (string-to-number (match-string 6) 16))
 244           (if (= tem 255)
 245               (setq battery-status "N/A")
 246             (setq tem (string-to-number (match-string 5) 16))
 247             (cond ((= tem 0) (setq battery-status "high"
 248                                    battery-status-symbol ""))
 249                   ((= tem 1) (setq battery-status "low"
 250                                    battery-status-symbol "-"))
 251                   ((= tem 2) (setq battery-status "critical"
 252                                    battery-status-symbol "!"))
 253                   ((= tem 3) (setq battery-status "charging"
 254                                    battery-status-symbol "+")))
 255             (setq load-percentage (match-string 7))
 256             (setq seconds (string-to-number (match-string 8)))
 257             (and (string-equal (match-string 9) "min")
 258                  (setq seconds (* 60 seconds)))
 259             (setq minutes (/ seconds 60)
 260                   hours (/ seconds 3600))
 261             (setq remaining-time
 262                   (format "%d:%02d" hours (- minutes (* 60 hours))))))))
 263     (list (cons ?v (or driver-version "N/A"))
 264           (cons ?V (or bios-version "N/A"))
 265           (cons ?I (or bios-interface "N/A"))
 266           (cons ?L (or line-status "N/A"))
 267           (cons ?B (or battery-status "N/A"))
 268           (cons ?b (or battery-status-symbol ""))
 269           (cons ?p (or load-percentage "N/A"))
 270           (cons ?s (or (and seconds (number-to-string seconds)) "N/A"))
 271           (cons ?m (or (and minutes (number-to-string minutes)) "N/A"))
 272           (cons ?h (or (and hours (number-to-string hours)) "N/A"))
 273           (cons ?t (or remaining-time "N/A")))))
 274
 275 \f
 276 ;;; `/proc/acpi/' interface for Linux.
 277
 278 (defun battery-linux-proc-acpi ()
 279   "Get ACPI status information from Linux kernel.
 280 This function works only with the new `/proc/acpi/' format introduced
 281 in Linux version 2.4.20 and 2.6.0.
 282
 283 The following %-sequences are provided:
 284 %c Current capacity (mAh)
 285 %r Current rate
 286 %B Battery status (verbose)
 287 %b Battery status, empty means high, `-' means low,
 288    `!' means critical, and `+' means charging
 289 %d Temperature (in degrees Celsius)
 290 %L AC line status (verbose)
 291 %p Battery load percentage
 292 %m Remaining time (to charge or discharge) in minutes
 293 %h Remaining time (to charge or discharge) in hours
 294 %t Remaining time (to charge or discharge) in the form `h:min'"
 295   (let ((design-capacity 0)
 296         (last-full-capacity 0)
 297         full-capacity
 298         (warn 0)
 299         (low 0)
 300         capacity rate rate-type charging-state minutes hours)
 301     ;; ACPI provides information about each battery present in the system in
 302     ;; a separate subdirectory.  We are going to merge the available
 303     ;; information together since displaying for a variable amount of
 304     ;; batteries seems overkill for format-strings.
 305     (with-temp-buffer
 306       (dolist (dir (ignore-errors (directory-files "/proc/acpi/battery/"
 307                                                    t "\\`[^.]")))
 308         (erase-buffer)
 309         (ignore-errors (insert-file-contents (expand-file-name "state" dir)))
 310         (when (re-search-forward "present: +yes$" nil t)
 311           (and (re-search-forward "charging state: +\\(.*\\)$" nil t)
 312                (member charging-state '("unknown" "charged" nil))
 313                ;; On most multi-battery systems, most of the time only one
 314                ;; battery is "charging"/"discharging", the others are
 315                ;; "unknown".
 316                (setq charging-state (match-string 1)))
 317           (when (re-search-forward "present rate: +\\([0-9]+\\) \\(m[AW]\\)$"
 318                                    nil t)
 319             (setq rate (+ (or rate 0) (string-to-number (match-string 1)))
 320                   rate-type (or (and rate-type
 321                                      (if (string= rate-type (match-string 2))
 322                                          rate-type
 323                                        (error
 324                                         "Inconsistent rate types (%s vs. %s)"
 325                                         rate-type (match-string 2))))
 326                                 (match-string 2))))
 327           (when (re-search-forward "remaining capacity: +\\([0-9]+\\) m[AW]h$"
 328                                    nil t)
 329             (setq capacity
 330                   (+ (or capacity 0) (string-to-number (match-string 1))))))
 331         (goto-char (point-max))
 332         (ignore-errors (insert-file-contents (expand-file-name "info" dir)))
 333         (when (re-search-forward "present: +yes$" nil t)
 334           (when (re-search-forward "design capacity: +\\([0-9]+\\) m[AW]h$"
 335                                    nil t)
 336             (incf design-capacity (string-to-number (match-string 1))))
 337           (when (re-search-forward "last full capacity: +\\([0-9]+\\) m[AW]h$"
 338                                    nil t)
 339             (incf last-full-capacity (string-to-number (match-string 1))))
 340           (when (re-search-forward
 341                  "design capacity warning: +\\([0-9]+\\) m[AW]h$" nil t)
 342             (incf warn (string-to-number (match-string 1))))
 343           (when (re-search-forward "design capacity low: +\\([0-9]+\\) m[AW]h$"
 344                                    nil t)
 345             (incf low (string-to-number (match-string 1)))))))
 346     (setq full-capacity (if (> last-full-capacity 0)
 347                             last-full-capacity design-capacity))
 348     (and capacity rate
 349          (setq minutes (if (zerop rate) 0
 350                          (floor (* (/ (float (if (string= charging-state
 351                                                           "charging")
 352                                                  (- full-capacity capacity)
 353                                                capacity))
 354                                       rate)
 355                                    60)))
 356                hours (/ minutes 60)))
 357     (list (cons ?c (or (and capacity (number-to-string capacity)) "N/A"))
 358           (cons ?L (or (battery-search-for-one-match-in-files
 359                         (mapcar (lambda (e) (concat e "/state"))
 360                                 (ignore-errors
 361                                   (directory-files "/proc/acpi/ac_adapter/"
 362                                                    t "\\`[^.]")))
 363                         "state: +\\(.*\\)$" 1)
 364
 365                        "N/A"))
 366           (cons ?d (or (battery-search-for-one-match-in-files
 367                         (mapcar (lambda (e) (concat e "/temperature"))
 368                                 (ignore-errors
 369                                   (directory-files "/proc/acpi/thermal_zone/"
 370                                                    t "\\`[^.]")))
 371                         "temperature: +\\([0-9]+\\) C$" 1)
 372
 373                        "N/A"))
 374           (cons ?r (or (and rate (concat (number-to-string rate) " "
 375                                          rate-type)) "N/A"))
 376           (cons ?B (or charging-state "N/A"))
 377           (cons ?b (or (and (string= charging-state "charging") "+")
 378                        (and capacity (< capacity low) "!")
 379                        (and capacity (< capacity warn) "-")
 380                        ""))
 381           (cons ?h (or (and hours (number-to-string hours)) "N/A"))
 382           (cons ?m (or (and minutes (number-to-string minutes)) "N/A"))
 383           (cons ?t (or (and minutes
 384                             (format "%d:%02d" hours (- minutes (* 60 hours))))
 385                        "N/A"))
 386           (cons ?p (or (and full-capacity capacity
 387                             (> full-capacity 0)
 388                             (number-to-string
 389                              (floor (/ capacity
 390                                        (/ (float full-capacity) 100)))))
 391                        "N/A")))))
 392
 393 \f
 394 ;;; `pmset' interface for Darwin (OS X).
 395
 396 (defun battery-pmset ()
 397   "Get battery status information using `pmset'.
 398
 399 The following %-sequences are provided:
 400 %L Power source (verbose)
 401 %B Battery status (verbose)
 402 %b Battery status, empty means high, `-' means low,
 403    `!' means critical, and `+' means charging
 404 %p Battery load percentage
 405 %h Remaining time in hours
 406 %m Remaining time in minutes
 407 %t Remaining time in the form `h:min'"
 408   (let (power-source load-percentage battery-status battery-status-symbol
 409         remaining-time hours minutes)
 410     (with-temp-buffer
 411       (ignore-errors (call-process "pmset" nil t nil "-g" "ps"))
 412       (goto-char (point-min))
 413       (when (re-search-forward "Currentl?y drawing from '\\(AC\\|Battery\\) Power'" nil t)
 414         (setq power-source (match-string 1))
 415         (when (re-search-forward "^ -InternalBattery-0[ \t]+" nil t)
 416           (when (looking-at "\\([0-9]\\{1,3\\}\\)%")
 417             (setq load-percentage (match-string 1))
 418             (goto-char (match-end 0))
 419             (cond ((looking-at "; charging")
 420                    (setq battery-status "charging"
 421                          battery-status-symbol "+"))
 422                   ((< (string-to-number load-percentage) battery-load-low)
 423                    (setq battery-status "low"
 424                          battery-status-symbol "-"))
 425                   ((< (string-to-number load-percentage) battery-load-critical)
 426                    (setq battery-status "critical"
 427                          battery-status-symbol "!"))
 428                   (t
 429                    (setq battery-status "high"
 430                          battery-status-symbol "")))
 431             (when (re-search-forward "\\(\\([0-9]+\\):\\([0-9]+\\)\\) remaining"  nil t)
 432               (setq remaining-time (match-string 1))
 433               (let ((h (string-to-number (match-string 2)))
 434                     (m (string-to-number (match-string 3))))
 435                 (setq hours (number-to-string (+ h (if (< m 30) 0 1)))
 436                       minutes (number-to-string (+ (* h 60) m)))))))))
 437     (list (cons ?L (or power-source "N/A"))
 438           (cons ?p (or load-percentage "N/A"))
 439           (cons ?B (or battery-status "N/A"))
 440           (cons ?b (or battery-status-symbol ""))
 441           (cons ?h (or hours "N/A"))
 442           (cons ?m (or minutes "N/A"))
 443           (cons ?t (or remaining-time "N/A")))))
 444
 445 \f
 446 ;;; Private functions.
 447
 448 (defun battery-format (format alist)
 449   "Substitute %-sequences in FORMAT."
 450   (replace-regexp-in-string
 451    "%."
 452    (lambda (str)
 453      (let ((char (aref str 1)))
 454        (if (eq char ?%) "%"
 455          (or (cdr (assoc char alist)) ""))))
 456    format t t))
 457
 458 (defun battery-search-for-one-match-in-files (files regexp match-num)
 459   "Search REGEXP in the content of the files listed in FILES.
 460 If a match occurred, return the parenthesized expression numbered by
 461 MATCH-NUM in the match.  Otherwise, return nil."
 462   (with-temp-buffer
 463     (catch 'found
 464       (dolist (file files)
 465         (and (ignore-errors (insert-file-contents file nil nil nil 'replace))
 466              (re-search-forward regexp nil t)
 467              (throw 'found (match-string match-num)))))))
 468
 469 \f
 470 (provide 'battery)
 471
 472 ;; arch-tag: 65916f50-4754-4b6b-ac21-0b510f545a37
 473 ;;; battery.el ends here