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1 | ;;; battery.el --- display battery status information. |
2 | ||
f12b0b96 | 3 | ;; Copyright (C) 1997 Free Software Foundation, Inc. |
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4 | |
5 | ;; Author: Ralph Schleicher <rs@purple.UL.BaWue.DE> | |
6 | ;; Keywords: local hardware | |
7 | ||
f12b0b96 | 8 | ;; This file is part of GNU Emacs. |
6b279740 | 9 | |
f12b0b96 | 10 | ;; GNU Emacs is free software; you can redistribute it and/or modify |
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11 | ;; it under the terms of the GNU General Public License as published by |
12 | ;; the Free Software Foundation; either version 2, or (at your option) | |
13 | ;; any later version. | |
14 | ||
f12b0b96 | 15 | ;; GNU Emacs is distributed in the hope that it will be useful, |
6b279740 RS |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
f12b0b96 RS |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
6b279740 RS |
23 | ;; Boston, MA 02111-1307, USA. |
24 | ||
25 | ;;; Commentary: | |
26 | ||
27 | ;; There is at present only a function interpreting the new `/proc/apm' | |
28 | ;; file format of Linux version 1.3.58 or newer. That is, what a lucky | |
29 | ;; coincidence, exactly the interface provided by the author's labtop. | |
30 | ||
31 | ;;; Code: | |
32 | ||
33 | (require 'timer) | |
34 | ||
35 | \f | |
36 | (defvar battery-status-function | |
37 | (cond ((and (eq system-type 'gnu/linux) | |
38 | (file-readable-p "/proc/apm")) | |
39 | 'battery-linux-proc-apm)) | |
40 | "*Function for getting battery status information. | |
41 | The function have to return an alist of conversion definitions. | |
42 | Cons cells are of the form | |
43 | ||
44 | (CONVERSION . REPLACEMENT-TEXT) | |
45 | ||
46 | CONVERSION is the character code of a \"conversion specification\" | |
47 | introduced by a `%' character in a control string.") | |
48 | ||
49 | (defvar battery-echo-area-format | |
50 | (cond ((eq battery-status-function 'battery-linux-proc-apm) | |
51 | "Power %L, battery %B (%p%% load, remaining time %t)")) | |
52 | "*Control string formatting the string to display in the echo area. | |
53 | Ordinary characters in the control string are printed as-is, while | |
54 | conversion specifications introduced by a `%' character in the control | |
55 | string are substituted as defined by the current value of the variable | |
56 | `battery-status-function'.") | |
57 | ||
58 | (defvar battery-mode-line-string nil | |
59 | "String to display in the mode line.") | |
60 | ||
61 | (defvar battery-mode-line-format | |
62 | (cond ((eq battery-status-function 'battery-linux-proc-apm) | |
63 | " [%b%p%%]")) | |
64 | "*Control string formatting the string to display in the mode line. | |
65 | Ordinary characters in the control string are printed as-is, while | |
66 | conversion specifications introduced by a `%' character in the control | |
67 | string are substituted as defined by the current value of the variable | |
68 | `battery-status-function'.") | |
69 | ||
70 | (defvar battery-update-interval 60 | |
71 | "*Seconds after which the battery status will be updated.") | |
72 | ||
73 | (defvar battery-update-timer nil | |
74 | "Interval timer object.") | |
75 | ||
76 | ;;;### autoload | |
77 | (defun battery () | |
78 | "Display battery status information in the echo area. | |
79 | The text beeing displayed in the echo area is controlled by the variables | |
80 | `battery-echo-area-format' and `battery-status-function'." | |
81 | (interactive) | |
82 | (message "%s" (if (and battery-echo-area-format battery-status-function) | |
83 | (battery-format battery-echo-area-format | |
84 | (funcall battery-status-function)) | |
85 | "Battery status not available"))) | |
86 | ||
87 | ;;;### autoload | |
88 | (defun display-battery () | |
89 | "Display battery status information in the mode line. | |
90 | The text beeing displayed in the mode line is controlled by the variables | |
91 | `battery-mode-line-format' and `battery-status-function'. | |
92 | The mode line will be updated automatically every `battery-update-interval' | |
93 | seconds." | |
94 | (interactive) | |
95 | (setq battery-mode-line-string "") | |
96 | (or global-mode-string (setq global-mode-string '(""))) | |
97 | (or (memq 'battery-mode-line-string global-mode-string) | |
98 | (setq global-mode-string (append global-mode-string | |
99 | '(battery-mode-line-string)))) | |
100 | (and battery-update-timer (cancel-timer battery-update-timer)) | |
101 | (setq battery-update-timer (run-at-time nil battery-update-interval | |
102 | 'battery-update-handler)) | |
103 | (battery-update)) | |
104 | ||
105 | (defun battery-update-handler () | |
106 | (battery-update) | |
107 | (sit-for 0)) | |
108 | ||
109 | (defun battery-update () | |
110 | "Update battery status information in the mode line." | |
111 | (setq battery-mode-line-string (if (and battery-mode-line-format | |
112 | battery-status-function) | |
113 | (battery-format | |
114 | battery-mode-line-format | |
115 | (funcall battery-status-function)) | |
116 | "")) | |
117 | (force-mode-line-update)) | |
118 | ||
119 | \f | |
120 | ;;; `/proc/apm' interface for Linux. | |
121 | ||
122 | (defconst battery-linux-proc-apm-regexp | |
123 | (concat "^\\([^ ]+\\)" ; Driver version. | |
124 | " \\([^ ]+\\)" ; APM BIOS version. | |
125 | " 0x\\([0-9a-f]+\\)" ; APM BIOS flags. | |
126 | " 0x\\([0-9a-f]+\\)" ; AC line status. | |
127 | " 0x\\([0-9a-f]+\\)" ; Battery status. | |
128 | " 0x\\([0-9a-f]+\\)" ; Battery flags. | |
129 | " \\([0-9]+\\)%" ; Load percentage. | |
130 | " \\([0-9]+\\)" ; Remaining time. | |
131 | " \\(.*\\)" ; Time unit. | |
132 | "$") | |
133 | "Regular expression matching contents of `/proc/apm'.") | |
134 | ||
135 | (defun battery-linux-proc-apm () | |
136 | "Get APM status information from Linux kernel. | |
137 | This function works only with the new `/proc/apm' format introduced | |
138 | in Linux version 1.3.58. | |
139 | ||
140 | The following %-sequences are provided: | |
141 | %v Linux driver version | |
142 | %V APM BIOS version | |
143 | %I APM BIOS status (verbose) | |
144 | %L AC line status (verbose) | |
145 | %B Battery status (verbose) | |
146 | %b Battery status, empty means high, `-' means low, | |
147 | `!' means critical, and `+' means charging | |
148 | %p battery load percentage | |
149 | %s Remaining time in seconds | |
150 | %m Remaining time in minutes | |
151 | %h Remaining time in hours | |
152 | %t Remaining time in the form `h:min'" | |
153 | (let (driver-version bios-version bios-interface line-status | |
154 | battery-status battery-status-symbol load-percentage | |
155 | seconds minutes hours remaining-time buffer tem) | |
156 | (unwind-protect | |
157 | (save-excursion | |
158 | (setq buffer (generate-new-buffer " *battery*")) | |
159 | (buffer-disable-undo buffer) | |
160 | (set-buffer buffer) | |
161 | (battery-insert-file-contents "/proc/apm") | |
162 | (re-search-forward battery-linux-proc-apm-regexp) | |
163 | (setq driver-version (match-string 1)) | |
164 | (setq bios-version (match-string 2)) | |
165 | (setq tem (battery-hex-to-int-2 (match-string 3))) | |
166 | (if (not (logand tem 2)) | |
167 | (setq bios-interface "not supported") | |
168 | (setq bios-interface "enabled") | |
169 | (cond ((logand tem 16) (setq bios-interface "disabled")) | |
170 | ((logand tem 32) (setq bios-interface "disengaged"))) | |
171 | (setq tem (battery-hex-to-int-2 (match-string 4))) | |
172 | (cond ((= tem 0) (setq line-status "off-line")) | |
173 | ((= tem 1) (setq line-status "on-line")) | |
174 | ((= tem 2) (setq line-status "on backup"))) | |
175 | (setq tem (battery-hex-to-int-2 (match-string 6))) | |
176 | (if (= tem 255) | |
177 | (setq battery-status "N/A") | |
178 | (setq tem (battery-hex-to-int-2 (match-string 5))) | |
179 | (cond ((= tem 0) (setq battery-status "high" | |
180 | battery-status-symbol "")) | |
181 | ((= tem 1) (setq battery-status "low" | |
182 | battery-status-symbol "-")) | |
183 | ((= tem 2) (setq battery-status "critical" | |
184 | battery-status-symbol "!")) | |
185 | ((= tem 3) (setq battery-status "charging" | |
186 | battery-status-symbol "+"))) | |
187 | (setq load-percentage (match-string 7)) | |
188 | (setq seconds (string-to-number (match-string 8))) | |
189 | (and (string-equal (match-string 9) "min") | |
190 | (setq seconds (* 60 seconds))) | |
191 | (setq minutes (/ seconds 60) | |
192 | hours (/ seconds 3600)) | |
193 | (setq remaining-time | |
194 | (format "%d:%02d" hours (- minutes (* 60 hours))))))) | |
195 | (and buffer (kill-buffer buffer))) | |
196 | (list (cons ?v driver-version) | |
197 | (cons ?V bios-version) | |
198 | (cons ?I bios-interface) | |
199 | (cons ?L line-status) | |
200 | (cons ?B battery-status) | |
201 | (cons ?b battery-status-symbol) | |
202 | (cons ?p load-percentage) | |
203 | (cons ?s (and seconds (number-to-string seconds))) | |
204 | (cons ?m (and minutes (number-to-string minutes))) | |
205 | (cons ?h (and hours (number-to-string hours))) | |
206 | (cons ?t remaining-time)))) | |
207 | ||
208 | \f | |
209 | ;;; Private functions. | |
210 | ||
211 | (defun battery-format (format alist) | |
212 | "Substitute %-sequences in FORMAT." | |
213 | (let ((index 0) | |
214 | (length (length format)) | |
215 | (result "") | |
216 | char flag elem) | |
217 | (while (< index length) | |
218 | (setq char (aref format index)) | |
219 | (if (not flag) | |
220 | (if (char-equal char ?%) | |
221 | (setq flag t) | |
222 | (setq result (concat result (char-to-string char)))) | |
223 | (cond ((char-equal char ?%) | |
224 | (setq result (concat result "%"))) | |
225 | ((setq elem (assoc char alist)) | |
226 | (setq result (concat result (cdr elem))))) | |
227 | (setq flag nil)) | |
228 | (setq index (1+ index))) | |
229 | (or (null flag) | |
230 | (setq result (concat result "%"))) | |
231 | result)) | |
232 | ||
233 | (defun battery-insert-file-contents (file-name) | |
234 | "Insert contents of file FILE-NAME after point. | |
235 | FILE-NAME can be a non-ordinary file, for example, a named pipe. | |
236 | Return t if file exists." | |
237 | (let ((load-read-function 'battery-read-function) | |
238 | (load-path '(".")) | |
239 | (load-history nil)) | |
240 | (save-excursion | |
241 | (load file-name nil t t)))) | |
242 | ||
243 | (defun battery-read-function (&optional stream) | |
244 | "Function for reading expressions from STREAM. | |
245 | Value is always nil." | |
246 | (let (char) | |
247 | (while (not (< (setq char (get-file-char)) 0)) | |
248 | (insert char)))) | |
249 | ||
250 | (defconst battery-hex-map '((?0 . 0) (?1 . 1) (?2 . 2) (?3 . 3) | |
251 | (?4 . 4) (?5 . 5) (?6 . 6) (?7 . 7) | |
252 | (?8 . 8) (?9 . 9) (?a . 10) (?b . 11) | |
253 | (?c . 12) (?d . 13) (?e . 14) (?f . 15))) | |
254 | ||
255 | (defun battery-hex-to-int (string) | |
256 | "Convert a hexadecimal number (a string) into a number." | |
257 | (save-match-data | |
258 | (and (string-match "^[ \t]+" string) | |
259 | (setq string (substring string (match-end 0)))) | |
260 | (and (string-match "^0[xX]" string) | |
261 | (setq string (substring string (match-end 0))))) | |
262 | (battery-hex-to-int-2 string)) | |
263 | ||
264 | (defun battery-hex-to-int-2 (string) | |
265 | (let ((index 0) | |
266 | (length (length string)) | |
267 | (value 0) | |
268 | (elem nil)) | |
269 | (while (and (< index length) | |
270 | (setq elem (assoc (downcase (aref string index)) | |
271 | battery-hex-map))) | |
272 | (setq value (+ (* 16 value) (cdr elem)) | |
273 | index (1+ index))) | |
274 | value)) | |
275 | ||
276 | \f | |
277 | (provide 'battery) | |
278 | ||
279 | ;;; battery.el ends here |