all messages for Emacs-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
blob 0fae92ab981d487cf4baaa67467e944df3fab89f 46902 bytes (raw)
name: lisp/battery.el 	 # note: path name is non-authoritative(*)

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
 
;;; battery.el --- display battery status information  -*- lexical-binding:t -*-

;; Copyright (C) 1997-1998, 2000-2022 Free Software Foundation, Inc.

;; Author: Ralph Schleicher <rs@ralph-schleicher.de>
;; Maintainer: emacs-devel@gnu.org
;; 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 3 of the License, 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.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; There is at present support for GNU/Linux, BSD, macOS, and Windows.
;; This library supports:
;; - UPower (https://upower.freedesktop.org) via D-Bus API.
;; - The `/sys/class/power_supply/' files of Linux >= 2.6.39.
;; - The `/proc/acpi/' directory structure of Linux 2.4.20 and 2.6.
;; - The `/proc/apm' file format of Linux version 1.3.58 or newer.
;; - BSD by using the `apm' program.
;; - Darwin (macOS) by using the `pmset' program.
;; - Windows via the GetSystemPowerStatus API call.

;;; Code:

(require 'dbus)
(eval-when-compile (require 'cl-lib))
\f
(defgroup battery nil
  "Display battery status information."
  :prefix "battery-"
  :group 'hardware)

(defcustom battery-upower-device nil
  "Preferred UPower device name(s).
When `battery-status-function' is set to `battery-upower', this
user option specifies which power sources to query for status
information and merge into a single report.

When nil (the default), `battery-upower' queries all present
battery and line power devices as determined by the UPower
EnumerateDevices method.  A string or a nonempty list of strings
names particular devices to query instead.  UPower battery and
line power device names typically follow the patterns
\"battery_BATN\" and \"line_power_ACN\", respectively, with N
starting at 0 when present.  Device names should not include the
leading D-Bus path \"/org/freedesktop/UPower/devices/\"."
  :version "28.1"
  :type '(choice (const :tag "Autodetect all devices" nil)
                 (string :tag "Device")
                 (repeat :tag "Devices" string)))

(defcustom battery-upower-subscribe t
  "Whether to subscribe to UPower device change signals.
When nil, battery status information is polled every
`battery-update-interval' seconds.  When non-nil (the default),
the battery status is also updated whenever a power source is
added or removed, or when the system starts or stops running on
battery power.

This only takes effect when `battery-status-function' is set to
`battery-upower' before enabling `display-battery-mode'."
  :version "28.1"
  :type 'boolean)

(defconst battery-upower-service "org.freedesktop.UPower"
  "Well-known name of the UPower D-Bus service.
See URL `https://upower.freedesktop.org/docs/ref-dbus.html'.")

(defun battery--files (dir)
  "Return a list of absolute file names in DIR or nil on error.
Value does not include \".\" or \"..\"."
  (ignore-errors (directory-files dir t directory-files-no-dot-files-regexp)))

(defun battery--find-linux-sysfs-batteries ()
  "Return a list of all sysfs battery directories."
  (let (dirs)
    (dolist (dir (battery--files "/sys/class/power_supply/"))
      (when (file-exists-p (expand-file-name "capacity" dir))
        (push dir dirs)))
    (nreverse dirs)))

(defcustom battery-status-function
  (cond ((member battery-upower-service (dbus-list-activatable-names))
         #'battery-upower)
        ((and (eq system-type 'gnu/linux)
              (file-readable-p "/sys/")
              (battery--find-linux-sysfs-batteries))
         #'battery-linux-sysfs)
	((and (eq system-type 'gnu/linux)
	      (file-directory-p "/proc/acpi/battery"))
	 #'battery-linux-proc-acpi)
	((and (eq system-type 'gnu/linux)
              (file-readable-p "/proc/")
              (file-readable-p "/proc/apm"))
         #'battery-linux-proc-apm)
	((and (eq system-type 'berkeley-unix)
	      (file-executable-p "/usr/sbin/apm"))
	 #'battery-bsd-apm)
	((and (eq system-type 'darwin)
              (ignore-errors
                (with-temp-buffer
                  (and (eq (call-process "pmset" nil t nil "-g" "ps") 0)
                       (not (bobp))))))
	 #'battery-pmset)
        ((and (eq system-type 'haiku)
              ;; TODO: Support the Haiku APM battery driver.
              (file-directory-p "/dev/power/acpi_battery"))
         #'battery-haiku-acpi-battery)
	((fboundp 'w32-battery-status)
	 #'w32-battery-status))
  "Function for getting battery status information.
The function has to return an alist of conversion definitions.
Its 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."
  :version "28.1"
  :type '(choice (const nil) function))

(defcustom battery-echo-area-format
  "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'.  Here are the ones generally available:
%c Current capacity (mAh or mWh)
%r Current rate of charge or discharge
%L AC line status (verbose)
%B Battery status (verbose)
%b Battery status: empty means high, `-' means low,
   `!' means critical, and `+' means charging
%d Temperature (in degrees Celsius)
%p Battery load percentage
%s Remaining time (to charge or discharge) in seconds
%m Remaining time (to charge or discharge) in minutes
%h Remaining time (to charge or discharge) in hours
%t Remaining time (to charge or discharge) in the form `h:min'

The full `format-spec' formatting syntax is supported."
  :link '(info-link "(elisp) Custom Format Strings")
  :type '(choice string (const nil)))

(defvar battery-mode-line-string nil
  "String to display in the mode line.")
;;;###autoload (put 'battery-mode-line-string 'risky-local-variable t)

(defcustom battery-mode-line-limit 100
  "Percentage of full battery load below which display battery status."
  :version "24.1"
  :type 'integer)

(defcustom battery-mode-line-format
  (cond ((eq battery-status-function #'battery-linux-proc-acpi)
	 "[%b%p%%,%d°C] ")
	(battery-status-function
	 "[%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'.  Here are the ones generally available:
%c Current capacity (mAh or mWh)
%r Current rate of charge or discharge
%L AC line status (verbose)
%B Battery status (verbose)
%b Battery status: empty means high, `-' means low,
   `!' means critical, and `+' means charging
%d Temperature (in degrees Celsius)
%p Battery load percentage
%s Remaining time (to charge or discharge) in seconds
%m Remaining time (to charge or discharge) in minutes
%h Remaining time (to charge or discharge) in hours
%t Remaining time (to charge or discharge) in the form `h:min'

The full `format-spec' formatting syntax is supported."
  :link '(info-link "(elisp) Custom Format Strings")
  :type '(choice string (const nil)))

(defcustom battery-update-interval 60
  "Seconds after which the battery status will be updated."
  :type 'integer)

(defcustom battery-load-low 25
  "Upper bound of low battery load percentage.
A battery load percentage below this number is considered low."
  :type 'integer)

(defcustom battery-load-critical 10
  "Upper bound of critical battery load percentage.
A battery load percentage below this number is considered critical."
  :type 'integer)

(defface battery-load-low
  '((t :inherit warning))
  "Face used in mode line string when battery load is low.
See the option `battery-load-low'."
  :version "28.1")

(defface battery-load-critical
  '((t :inherit error))
  "Face used in mode line string when battery load is critical.
See the option `battery-load-critical'."
  :version "28.1")

(defvar battery-update-timer nil
  "Interval timer object.")

;;;###autoload
(defun battery ()
  "Display battery status information in the echo area.
The text being 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")))

(defcustom battery-update-functions nil
  "Functions run by `display-battery-mode' after updating the status.
These functions will be called with one parameter, an alist that
contains data about the current battery status.  The keys in the
alist are single characters and the values are strings.
Different battery backends deliver different information, so some
of the following information may or may not be available:

    v: driver-version
    V: bios-version
    I: bios-interface
    L: line-status
    B: battery-status
    b: battery-status-symbol
    p: load-percentage
    s: seconds
    m: minutes
    h: hours
    t: remaining-time

For instance, to play an alarm when the battery power dips below
10%, you could use a function like the following:

  (defvar my-prev-battery nil)
  (defun my-battery-alarm (data)
    (when (and my-prev-battery
               (equal (alist-get ?L data) \"off-line\")
               (< (string-to-number (alist-get ?p data)) 10)
               (>= (string-to-number (alist-get ?p my-prev-battery)) 10))
      (play-sound-file \"~/alarm.wav\" 5))
    (setq my-prev-battery data))"
  :version "29.1"
  :type '(repeat function))

;;;###autoload
(define-minor-mode display-battery-mode
  "Toggle battery status display in mode line (Display Battery mode).

The text displayed in the mode line is controlled by
`battery-mode-line-format' and `battery-status-function'.
The mode line is be updated every `battery-update-interval'
seconds.

The function which updates the mode-line display will call the
functions in `battery-update-functions', which can be used to
trigger actions based on battery-related events."
  :global t
  (setq battery-mode-line-string "")
  (or global-mode-string (setq global-mode-string '("")))
  (and battery-update-timer (cancel-timer battery-update-timer))
  (battery--upower-unsubscribe)
  (if (and battery-status-function battery-mode-line-format)
      (if (not display-battery-mode)
	  (setq global-mode-string
		(delq 'battery-mode-line-string global-mode-string))
	(add-to-list 'global-mode-string 'battery-mode-line-string t)
        (and (eq battery-status-function #'battery-upower)
             battery-upower-subscribe
             (battery--upower-subscribe))
	(setq battery-update-timer (run-at-time nil battery-update-interval
                                                #'battery-update-handler))
	(battery-update))
    (message "Battery status not available")
    (setq display-battery-mode nil)))

(defun battery-update-handler ()
  (battery-update)
  (sit-for 0))

(defun battery-update ()
  "Update battery status information in the mode line."
  (let* ((data (and battery-status-function (funcall battery-status-function)))
         (percentage (car (read-from-string (cdr (assq ?p data)))))
         (res (and battery-mode-line-format
                   (or (not (numberp percentage))
                       (<= percentage battery-mode-line-limit))
                   (battery-format battery-mode-line-format data)))
         (len (length res)))
    (unless (zerop len)
      (cond ((not (numberp percentage)))
            ((< percentage battery-load-critical)
             (add-face-text-property 0 len 'battery-load-critical t res))
            ((< percentage battery-load-low)
             (add-face-text-property 0 len 'battery-load-low t res)))
      (put-text-property 0 len 'help-echo "Battery status information" res))
    (setq battery-mode-line-string (or res ""))
    (run-hook-with-args 'battery-update-functions data))
  (force-mode-line-update t))

\f
;;; `/proc/apm' interface for Linux.

;; Regular expression matching contents of `/proc/apm'.
(rx-define battery--linux-proc-apm
  (: bol   (group (+ (not ?\s)))        ; Driver version.
     " "   (group (+ (not ?\s)))        ; APM BIOS version.
     " 0x" (group (+ xdigit))           ; APM BIOS flags.
     " 0x" (group (+ xdigit))           ; AC line status.
     " 0x" (group (+ xdigit))           ; Battery status.
     " 0x" (group (+ xdigit))           ; Battery flags.
     " "   (group (? ?-) (+ digit)) ?%  ; Load percentage.
     " "   (group (? ?-) (+ digit))     ; Remaining time.
     " "   (group (* nonl))             ; Time unit
     eol))

(defconst battery-linux-proc-apm-regexp (rx battery--linux-proc-apm)
  "Regular expression matching contents of `/proc/apm'.")
(make-obsolete-variable 'battery-linux-proc-apm-regexp
                        "it is no longer used." "28.1")

(defun battery-linux-proc-apm ()
  "Get APM status information from Linux (the 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 (to charge or discharge) in seconds
%m Remaining time (to charge or discharge) in minutes
%h Remaining time (to charge or discharge) in hours
%t Remaining time (to charge or discharge) 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 tem )
    (with-temp-buffer
      (ignore-errors (insert-file-contents "/proc/apm"))
      (when (re-search-forward (rx battery--linux-proc-apm) nil t)
	(setq driver-version (match-string 1))
	(setq bios-version (match-string 2))
	(setq tem (string-to-number (match-string 3) 16))
        (if (zerop (logand tem 2))
	    (setq bios-interface "not supported")
	  (setq bios-interface "enabled")
          (cond ((/= (logand tem 16) 0) (setq bios-interface "disabled"))
                ((/= (logand tem 32) 0) (setq bios-interface "disengaged")))
	  (setq tem (string-to-number (match-string 4) 16))
	  (cond ((= tem 0) (setq line-status "off-line"))
		((= tem 1) (setq line-status "on-line"))
		((= tem 2) (setq line-status "on backup")))
          (unless (= (string-to-number (match-string 6) 16) 255)
	    (setq tem (string-to-number (match-string 5) 16))
	    (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)))))))
    (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 (if seconds (number-to-string seconds) "N/A"))
          (cons ?m (if minutes (number-to-string minutes) "N/A"))
          (cons ?h (if hours (number-to-string hours) "N/A"))
	  (cons ?t (or remaining-time "N/A")))))

\f
;;; `/proc/acpi/' interface for Linux.

(rx-define battery--acpi-rate (&rest hour)
  (: (group (+ digit)) " " (group ?m (in "AW") hour)))
(rx-define battery--acpi-capacity (battery--acpi-rate ?h))

(defun battery-linux-proc-acpi ()
  "Get ACPI status information from Linux (the kernel).
This function works only with the `/proc/acpi/' interface
introduced in Linux version 2.4.20 and 2.6.0.

The following %-sequences are provided:
%c Current capacity (mAh)
%r Current rate of charge or discharge
%L AC line status (verbose)
%B Battery status (verbose)
%b Battery status, empty means high, `-' means low,
   `!' means critical, and `+' means charging
%d Temperature (in degrees Celsius)
%p Battery load percentage
%m Remaining time (to charge or discharge) in minutes
%h Remaining time (to charge or discharge) in hours
%t Remaining time (to charge or discharge) in the form `h:min'"
  (let ((design-capacity 0)
	(last-full-capacity 0)
	full-capacity
	(warn 0)
	(low 0)
	capacity rate rate-type charging-state minutes hours)
    ;; ACPI provides information about each battery present in the system in
    ;; a separate subdirectory.  We are going to merge the available
    ;; information together since displaying for a variable amount of
    ;; batteries seems overkill for format-strings.
    (with-temp-buffer
      (dolist (dir (battery--files "/proc/acpi/battery/"))
        (ignore-errors
          (insert-file-contents (expand-file-name "state" dir) nil nil nil t))
        (goto-char (point-min))
        (when (re-search-forward (rx "present:" (+ space) "yes" eol) nil t)
          (and (re-search-forward (rx "charging state:" (+ space)
                                      (group (not space) (* nonl)) eol)
                                  nil t)
	       (member charging-state '("unknown" "charged" nil))
	       ;; On most multi-battery systems, most of the time only one
	       ;; battery is "charging"/"discharging", the others are
	       ;; "unknown".
	       (setq charging-state (match-string 1)))
          (when (re-search-forward (rx "present rate:" (+ space)
                                       (battery--acpi-rate) eol)
				   nil t)
	    (setq rate (+ (or rate 0) (string-to-number (match-string 1))))
	    (when (> rate 0)
              (cond ((not rate-type)
                     (setq rate-type (match-string 2)))
                    ((not (string= rate-type (match-string 2)))
                     (error "Inconsistent rate types (%s vs. %s)"
                            rate-type (match-string 2))))))
          (when (re-search-forward (rx "remaining capacity:" (+ space)
                                       battery--acpi-capacity eol)
				   nil t)
	    (setq capacity
		  (+ (or capacity 0) (string-to-number (match-string 1))))))
	(goto-char (point-max))
	(ignore-errors (insert-file-contents (expand-file-name "info" dir)))
        (when (re-search-forward (rx "present:" (+ space) "yes" eol) nil t)
          (when (re-search-forward (rx "design capacity:" (+ space)
                                       battery--acpi-capacity eol)
				   nil t)
	    (cl-incf design-capacity (string-to-number (match-string 1))))
          (when (re-search-forward (rx "last full capacity:" (+ space)
                                       battery--acpi-capacity eol)
				   nil t)
	    (cl-incf last-full-capacity (string-to-number (match-string 1))))
          (when (re-search-forward (rx "design capacity warning:" (+ space)
                                       battery--acpi-capacity eol)
                                   nil t)
	    (cl-incf warn (string-to-number (match-string 1))))
          (when (re-search-forward (rx "design capacity low:" (+ space)
                                       battery--acpi-capacity eol)
				   nil t)
	    (cl-incf low (string-to-number (match-string 1)))))))
    (setq full-capacity (if (> last-full-capacity 0)
			    last-full-capacity design-capacity))
    (and capacity rate
	 (setq minutes (if (zerop rate) 0
			 (floor (* (if (string= charging-state
						"charging")
				       (- full-capacity capacity)
				     capacity)
				   60)
				rate))
	       hours (/ minutes 60)))
    (list (cons ?c (if capacity (number-to-string capacity) "N/A"))
	  (cons ?L (or (battery-search-for-one-match-in-files
                        (mapcar (lambda (d) (expand-file-name "state" d))
                                (battery--files "/proc/acpi/ac_adapter/"))
                        (rx "state:" (+ space) (group (not space) (* nonl)) eol)
                        1)
		       "N/A"))
	  (cons ?d (or (battery-search-for-one-match-in-files
                        (mapcar (lambda (d) (expand-file-name "temperature" d))
                                (battery--files "/proc/acpi/thermal_zone/"))
                        (rx "temperature:" (+ space) (group (+ digit)) " C" eol)
                        1)
		       "N/A"))
          (cons ?r (if rate
                       (concat (number-to-string rate) " " rate-type)
                     "N/A"))
	  (cons ?B (or charging-state "N/A"))
          (cons ?b (cond ((string= charging-state "charging") "+")
                         ((and capacity (< capacity low)) "!")
                         ((and capacity (< capacity warn)) "-")
                         ("")))
          (cons ?h (if hours (number-to-string hours) "N/A"))
          (cons ?m (if minutes (number-to-string minutes) "N/A"))
          (cons ?t (if minutes (format "%d:%02d" hours (% minutes 60)) "N/A"))
          (cons ?p (if (and full-capacity capacity (> full-capacity 0))
                       (number-to-string (floor (* 100 capacity) full-capacity))
                     "N/A")))))

\f
;;; `/sys/class/power_supply/BATN' interface for Linux.

(defun battery-linux-sysfs ()
  "Get sysfs status information from Linux kernel.
This function works only with the new `/sys/class/power_supply/'
interface introduced in Linux version 2.4.25.

The following %-sequences are provided:
%c Current capacity (mAh or mWh)
%r Current rate of charge or discharge
%L Power source (verbose)
%B Battery status (verbose)
%b Battery status, empty means high, `-' means low,
   `!' means critical, and `+' means charging
%d Temperature (in degrees Celsius)
%p Battery load percentage
%m Remaining time (to charge or discharge) in minutes
%h Remaining time (to charge or discharge) in hours
%t Remaining time (to charge or discharge) in the form `h:min'"
  (let (;; Some batteries report charges and current, others energy and power.
        ;; In order to reliably be able to combine those data, we convert them
        ;; all to energy/power (since we can't combine different charges if
        ;; they're not at the same voltage).
	(energy-full 0.0)
	(energy-now 0.0)
	(power-now 0.0)
        (voltage-now 10.8) ; Arbitrary default, in case the info is missing.
        charging-state temperature hours percentage-now)
    ;; SysFS provides information about each battery present in the
    ;; system in a separate subdirectory.  We are going to merge the
    ;; available information together.
    (with-temp-buffer
      (dolist (dir (battery--find-linux-sysfs-batteries))
        (ignore-errors
          (insert-file-contents (expand-file-name "uevent" dir) nil nil nil t))
	(goto-char (point-min))
	(when (re-search-forward
	       "POWER_SUPPLY_VOLTAGE_NOW=\\([0-9]*\\)$" nil t)
	  (setq voltage-now (/ (string-to-number (match-string 1)) 1000000.0)))
	(goto-char (point-min))
	(when (re-search-forward "POWER_SUPPLY_PRESENT=1$" nil t)
	  (goto-char (point-min))
	  (and (re-search-forward "POWER_SUPPLY_STATUS=\\(.*\\)$" nil t)
	       (member charging-state '("Unknown" "Full" nil))
	       (setq charging-state (match-string 1)))
	  (goto-char (point-min))
	  (when (re-search-forward
                 "POWER_SUPPLY_\\(CURRENT\\|POWER\\)_NOW=\\([0-9]*\\)$"
                 nil t)
	    (cl-incf power-now
		     (* (string-to-number (match-string 2))
			(if (eq (char-after (match-beginning 1)) ?C)
			    voltage-now 1))))
	  (goto-char (point-min))
	  (when (re-search-forward "POWER_SUPPLY_TEMP=\\([0-9]*\\)$" nil t)
	    (setq temperature (match-string 1)))
	  (goto-char (point-min))
	  (let (full-string now-string)
	    ;; Sysfs may list either charge (mAh) or energy (mWh).
	    ;; Keep track of both, and choose which to report later.
	    (cond ((and (re-search-forward
			 "POWER_SUPPLY_CHARGE_FULL=\\([0-9]*\\)$" nil t)
			(setq full-string (match-string 1))
			(re-search-forward
			 "POWER_SUPPLY_CHARGE_NOW=\\([0-9]*\\)$" nil t)
			(setq now-string (match-string 1)))
		   (cl-incf energy-full (* (string-to-number full-string)
                                           voltage-now))
		   (cl-incf energy-now  (* (string-to-number now-string)
                                           voltage-now)))
                  ((and (goto-char (point-min))
			(re-search-forward
			 "POWER_SUPPLY_ENERGY_FULL=\\([0-9]*\\)$" nil t)
			(setq full-string (match-string 1))
			(re-search-forward
			 "POWER_SUPPLY_ENERGY_NOW=\\([0-9]*\\)$" nil t)
			(setq now-string (match-string 1)))
		   (cl-incf energy-full (string-to-number full-string))
		   (cl-incf energy-now  (string-to-number now-string)))))
	  (unless (zerop power-now)
	    (let ((remaining (if (string= charging-state "Discharging")
				 energy-now
			       (- energy-full energy-now))))
	      (setq hours (/ remaining power-now)))))))
    (when (and (> energy-full 0) (> energy-now 0))
      (setq percentage-now (/ (* 100 energy-now) energy-full)))
    (list (cons ?c (if (or (> energy-full 0) (> energy-now 0))
                       (number-to-string (/ energy-now voltage-now))
                     "N/A"))
	  (cons ?r (if (> power-now 0.0)
		       (format "%.1f" (/ power-now 1000000.0))
		     "N/A"))
	  (cons ?m (if hours (format "%d" (* hours 60)) "N/A"))
	  (cons ?h (if hours (format "%d" hours) "N/A"))
	  (cons ?t (if hours
		       (format "%d:%02d" hours (* (- hours (floor hours)) 60))
		     "N/A"))
	  (cons ?d (or temperature "N/A"))
	  (cons ?B (or charging-state "N/A"))
          (cons ?b (cond ((string= charging-state "Charging") "+")
                         ((not percentage-now) "")
                         ((< percentage-now battery-load-critical) "!")
                         ((< percentage-now battery-load-low) "-")
                         ("")))
          (cons ?p (if percentage-now (format "%.1f" percentage-now) "N/A"))
          (cons ?L (pcase (battery-search-for-one-match-in-files
                           '("/sys/class/power_supply/AC/online"
                             "/sys/class/power_supply/ACAD/online"
                             "/sys/class/power_supply/ADP1/online")
                           (rx (in "01")) 0)
                     ("0" "BAT")
                     ("1" "AC")
                     (_ "N/A"))))))

\f
;;; `/dev/power/acpi_battery' interface for Haiku.

(defun battery--search-haiku-acpi-status ()
  "Search forward for battery status in the current buffer.
Return a property list once all relevant properties are found.
The following properties may be inside the list:

  - `:capacity' (the current capacity of the battery.)
  - `:voltage' (the current voltage of the battery.)
  - `:rate', (the current rate of charge or discharge.)
  - `:state' (the current state of the battery.)
  - `:design-capacity' (the design capacity of the battery.)
  - `:design-voltage' (the design voltage of the battery.)
  - `:last-full-charge' (the capacity at the last full charge of
    the battery.)

`:capacity' and `:design-capacity' are both represented in
terms of milliamp-hours."
  (let ((state-regexp "State \\([[:digit:]]+\\), Current Rate \\([[:digit:]]+\\), \
Capacity \\([[:digit:]]+\\), Voltage \\([[:digit:]]+\\)")
        (pu-regexp "Power Unit \\([[:digit:]]\\)+, Design Capacity \\([[:digit:]]+\\), \
Last Full Charge \\([[:digit:]]+\\)")
        (design-regexp "Design Voltage \\([[:digit:]]+\\)")
        power-unit last-full-charge state rate capacity
        voltage design-capacity design-voltage)
    (when (re-search-forward state-regexp)
      (setq state (string-to-number (match-string 1)))
      (setq rate (string-to-number (match-string 2)))
      (setq capacity (string-to-number (match-string 3)))
      (setq voltage (/ (string-to-number (match-string 4)) 1000.0)))
    (when (re-search-forward pu-regexp)
      (setq power-unit (string-to-number (match-string 1)))
      (setq design-capacity (string-to-number (match-string 2)))
      (setq last-full-charge (string-to-number (match-string 3))))
    (when (re-search-forward design-regexp)
      (setq design-voltage (/ (string-to-number (match-string 1)) 1000.0)))
    ;; Convert capacity fields to milliamp-hours if they're
    ;; specified as miliwatt-hours.
    (when (eq power-unit 0)
      (setq capacity (/ capacity voltage))
      (setq design-capacity (/ design-capacity design-voltage))
      (setq last-full-charge (/ last-full-charge voltage)))
    (list :capacity capacity :voltage voltage
          :rate rate :state (cond
                             ((not (zerop (logand state 2))) 'charging)
                             ((not (zerop (logand state 1))) 'discharging)
                             ((not (zerop (logand state 4))) 'critical)
                             (t 'fully-charged))
          :design-capacity design-capacity
          :design-voltage design-voltage
          :last-full-charge last-full-charge)))

(defun battery-haiku-acpi-battery ()
  "Get battery status from `/dev/power/acpi_battery'.
This function only works on Haiku systems with an ACPI battery.

The following %-sequences are provided:
%c Current capacity (mAh)
%r Current rate of charge or discharge
%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"
  (with-temp-buffer
    (dolist (file (battery--files "/dev/power/acpi_battery"))
      (insert-file-contents (expand-file-name file "/dev/power/acpi_battery")))
    ;; I don't think Haiku actually supports multiple batteries yet,
    ;; since the code in PowerStatus doesn't take care of that
    ;; situation.
    (let ((list (ignore-errors (battery--search-haiku-acpi-status))))
      (if list
          (list (cons ?c (format "%.0f" (plist-get list :capacity)))
                (cons ?r (format "%.0f" (plist-get list :rate)))
                (cons ?B (symbol-name (plist-get list :state)))
                (cons ?b (let ((state (plist-get list :state)))
                           (cond
                            ((eq state 'charging) "+")
                            ((and (eq state 'discharging)
                                  (< (/ (plist-get list :capacity)
                                        (plist-get list :last-full-charge))
                                     0.15))
                             "-")
                            ((eq state 'critical) "!")
                            (t ""))))
                (cons ?L (if (not (eq (plist-get list :state) 'discharging))
                             "on-line" "off-line"))
                (cons ?p (format "%.0f"
                                 (* 100 (/ (plist-get list :capacity)
                                           (plist-get list :last-full-charge))))))
        '((?c . "N/A")
          (?r . "N/A")
          (?B . "N/A")
          (?b . "N/A")
          (?p . "N/A"))))))

\f
;;; UPower interface.

(defconst battery-upower-interface "org.freedesktop.UPower"
  "Name of the UPower D-Bus interface.
See URL `https://upower.freedesktop.org/docs/UPower.html'.")

(defconst battery-upower-path "/org/freedesktop/UPower"
  "D-Bus object providing `battery-upower-interface'.")

(defconst battery-upower-device-interface "org.freedesktop.UPower.Device"
  "Name of the UPower Device D-Bus interface.
See URL `https://upower.freedesktop.org/docs/Device.html'.")

(defconst battery-upower-device-path "/org/freedesktop/UPower/devices"
  "D-Bus object providing `battery-upower-device-interface'.")

(defvar battery--upower-signals nil
  "Handles for UPower signal subscriptions.")

(defun battery--upower-signal-handler (&rest _)
  "Update battery status on receiving a UPower D-Bus signal."
  (timer-event-handler battery-update-timer))

(defun battery--upower-props-changed (_interface changed _invalidated)
  "Update status when system starts/stops running on battery.
Intended as a UPower PropertiesChanged signal handler."
  (when (assoc "OnBattery" changed)
    (battery--upower-signal-handler)))

(defun battery--upower-unsubscribe ()
  "Unsubscribe from UPower device change signals."
  (mapc #'dbus-unregister-object battery--upower-signals)
  (setq battery--upower-signals ()))

(defun battery--upower-subscribe ()
  "Subscribe to UPower device change signals."
  (push (dbus-register-signal :system battery-upower-service
                              battery-upower-path
                              dbus-interface-properties
                              "PropertiesChanged"
                              #'battery--upower-props-changed)
        battery--upower-signals)
  (dolist (method '("DeviceAdded" "DeviceRemoved"))
    (push (dbus-register-signal :system battery-upower-service
                                battery-upower-path
                                battery-upower-interface
                                method #'battery--upower-signal-handler)
          battery--upower-signals)))

(defun battery--upower-device-properties (device)
  "Return value for all available properties for the UPower DEVICE."
  (dbus-get-all-properties
   :system battery-upower-service
   (expand-file-name device battery-upower-device-path)
   battery-upower-device-interface))

(defun battery--upower-devices ()
  "List all UPower devices according to `battery-upower-device'."
  (cond ((stringp battery-upower-device)
         (list battery-upower-device))
        (battery-upower-device)
        ((dbus-ignore-errors
           (dbus-call-method :system battery-upower-service
                             battery-upower-path
                             battery-upower-interface
                             "EnumerateDevices"
                             :timeout 1000)))))

(defun battery--upower-state (props state)
  "Merge the UPower battery state in PROPS with STATE.
This is an extension of the UPower DisplayDevice algorithm for
merging multiple battery states into one.  PROPS is an alist of
battery properties from `battery-upower-device-interface', and
STATE is a symbol representing the state to merge with."
  ;; Map UPower enum into our printable symbols.
  (let* ((new (pcase (cdr (assoc "State" props))
                (1 'charging)
                (2 'discharging)
                (3 'empty)
                (4 'fully-charged)
                (5 'pending-charge)
                (6 'pending-discharge)))
         ;; Unknown state represented by nil.
         (either (delq nil (list new state))))
    ;; Earlier states override later ones.
    (car (cond ((memq 'charging either))
               ((memq 'discharging either))
               ((memq 'pending-charge either))
               ((memq 'pending-discharge either))
               ;; Only options left are full or empty,
               ;; but if they conflict return nil.
               ((null (cdr either)) either)
               ((apply #'eq either) either)))))

(defun battery-upower ()
  "Get battery status from UPower D-Bus interface.
This function works only in systems that provide a UPower D-Bus
service.

The following %-sequences are provided:
%c Current capacity (mWh)
%r Current rate of charge or discharge
%L AC line status (verbose)
%B Battery status (verbose)
%b Battery status: empty means high, `-' means low,
   `!' means critical, and `+' means charging
%d Temperature (in degrees Celsius)
%p Battery load percentage
%s Remaining time (to charge or discharge) in seconds
%m Remaining time (to charge or discharge) in minutes
%h Remaining time (to charge or discharge) in hours
%t Remaining time (to charge or discharge) in the form `h:min'"
  (let ((count 0) props type line-status state load temperature
        secs mins hrs total-energy total-rate total-tte total-ttf)
    ;; Merge information from all available or specified UPower
    ;; devices like other `battery-status-function's.
    (dolist (device (battery--upower-devices))
      (setq props (battery--upower-device-properties device))
      (setq type (cdr (assoc "Type" props)))
      (cond
       ((and (eq type 1) (not (eq line-status 'online)))
        ;; It's a line power device: `online' if currently providing
        ;; power, any other non-nil value if simply present.
        (setq line-status (if (cdr (assoc "Online" props)) 'online t)))
       ((and (eq type 2) (cdr (assoc "IsPresent" props)))
        ;; It's a battery.
        (setq count (1+ count))
        (setq state (battery--upower-state props state))
        (let ((energy  (cdr (assoc "Energy"      props)))
              (rate    (cdr (assoc "EnergyRate"  props)))
              (percent (cdr (assoc "Percentage"  props)))
              (temp    (cdr (assoc "Temperature" props)))
              (tte     (cdr (assoc "TimeToEmpty" props)))
              (ttf     (cdr (assoc "TimeToFull"  props))))
          (when energy  (setq total-energy (+ (or total-energy 0) energy)))
          (when rate    (setq total-rate   (+ (or total-rate   0) rate)))
          (when percent (setq load         (+ (or load         0) percent)))
          (when temp    (setq temperature  (+ (or temperature  0) temp)))
          (when tte     (setq total-tte    (+ (or total-tte    0) tte)))
          (when ttf     (setq total-ttf    (+ (or total-ttf    0) ttf)))))))
    (when (> count 1)
      ;; Averages over multiple batteries.
      (when load (setq load (/ load count)))
      (when temperature (setq temperature (/ temperature count))))
    (when (setq secs (if (eq line-status 'online) total-ttf total-tte))
      (setq mins (/ secs 60))
      (setq hrs (/ secs 3600)))
    (list (cons ?c (if total-energy
                       (format "%.0f" (* total-energy 1000))
                     "N/A"))
          (cons ?r (if total-rate (format "%.1f W" total-rate) "N/A"))
          (cons ?L (cond ((eq line-status 'online) "on-line")
                         (line-status "off-line")
                         ("N/A")))
          (cons ?B (format "%s" (or state 'unknown)))
          (cons ?b (cond ((eq state 'charging) "+")
                         ((and load (< load battery-load-critical)) "!")
                         ((and load (< load battery-load-low)) "-")
                         ("")))
          ;; Zero usually means unknown.
          (cons ?d (if (and temperature (/= temperature 0))
                       (format "%.0f" temperature)
                     "N/A"))
          (cons ?p (if load (format "%.0f" load) "N/A"))
          (cons ?s (if secs (number-to-string secs) "N/A"))
          (cons ?m (if mins (number-to-string mins) "N/A"))
          (cons ?h (if hrs (number-to-string hrs) "N/A"))
          (cons ?t (if hrs (format "%d:%02d" hrs (% mins 60)) "N/A")))))

\f
;;; `apm' interface for BSD.
(defun call-process-to-string (program &rest args)
  (with-output-to-string
    (with-current-buffer standard-output
      (apply #'call-process program nil t nil args))))

(defun battery-bsd-apm ()
  "Get APM status information from BSD apm binary.
The following %-sequences are provided:
%P Advanced power saving mode state (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 (to charge or discharge) in seconds
%m Remaining time (to charge or discharge) in minutes
%h Remaining time (to charge or discharge) in hours
%t Remaining time (to charge or discharge) in the form `h:min'"
  (let* ((os-name (car (split-string
                        ;; FIXME: Can't we use something like `system-type'?
                        (call-process-to-string "/usr/bin/uname"))))
         (apm-flag (pcase os-name
                     ("OpenBSD" "mP")
                     ("FreeBSD" "st")
                     (_         "ms")))
         (apm-args (concat "-abl" apm-flag))
         (apm-output (split-string (call-process-to-string "/usr/sbin/apm" apm-args)))
         (indices (pcase os-name
                    ;; FreeBSD's manpage documents that multiple
                    ;; outputs are ordered by "the order in which
                    ;; they're listed in the manpage", which is alphabetical
                    ;; and is also the order in which we pass them.
                    ("FreeBSD" '((ac . 0)
                                 (battery-status . 1)
                                 (battery-percent . 2)
                                 (apm-mode . 3)
                                 (battery-life . 4)))
                    ;; For NetBSD and OpenBSD, the manpage doesn't document
                    ;; the order.  The previous code used this order, so let's
                    ;; assume it's right.
                    (_         '((ac . 3)
                                 (battery-status . 0)
                                 (battery-percent . 1)
                                 (apm-mode . 4)
                                 (battery-life . 2)))))
         ;; Battery status
         (battery-status
          (pcase (string-to-number
                  (nth (alist-get 'battery-status indices) apm-output))
            (0 '("high" . ""))
            (1 '("low" . "-"))
            (2 '("critical" . "!"))
            (3 '("charging" . "+"))
            (4 '("absent" . nil))))
         ;; Battery percentage
         (battery-percentage
          (nth (alist-get 'battery-percent indices) apm-output))
         ;; Battery life
         (battery-life (nth (alist-get 'battery-life indices) apm-output))
         ;; AC status
         (line-status
          (pcase (string-to-number (nth (alist-get 'ac indices) apm-output))
            (0 "disconnected")
            (1 "connected")
            (2 "backup power")))
         ;; Advanced power savings mode
         (apm-mode
          (let ((apm (string-to-number
                      (nth (alist-get 'apm-mode indices) apm-output))))
            (if (string= os-name "OpenBSD")
                (pcase apm
                  (0 "manual")
                  (1 "automatic")
		  (2 "cool running"))
	      (if (eql apm 1) "on" "off"))))
	 seconds minutes hours remaining-time)
    (unless (member battery-life '("unknown" "-1"))
      (if (member os-name '("OpenBSD" "NetBSD"))
	  (setq minutes (string-to-number battery-life)
		seconds (* 60 minutes))
	(setq seconds (string-to-number battery-life)
	      minutes (truncate seconds 60)))
      (setq hours (truncate minutes 60)
            remaining-time (format "%d:%02d" hours (% minutes 60))))
    (list (cons ?L (or line-status "N/A"))
	  (cons ?B (or (car battery-status) "N/A"))
	  (cons ?b (or (cdr battery-status) "N/A"))
	  (cons ?p (if (string= battery-percentage "255")
		       "N/A"
		     battery-percentage))
	  (cons ?P (or apm-mode "N/A"))
          (cons ?s (if seconds (number-to-string seconds) "N/A"))
          (cons ?m (if minutes (number-to-string minutes) "N/A"))
          (cons ?h (if hours (number-to-string hours) "N/A"))
	  (cons ?t (or remaining-time "N/A")))))

\f
;;; `pmset' interface for Darwin (macOS).

(defun battery-pmset ()
  "Get battery status information using `pmset'.

The following %-sequences are provided:
%L Power source (verbose)
%B Battery status (verbose)
%b Battery status, empty means high, `-' means low,
   `!' means critical, and `+' means charging
%p Battery load percentage
%m Remaining time (to charge or discharge) in minutes
%h Remaining time (to charge or discharge) in hours
%t Remaining time (to charge or discharge) in the form `h:min'"
  (let ( power-source load-percentage battery-status battery-status-symbol
         remaining-time hours minutes )
    (with-temp-buffer
      (ignore-errors (call-process "pmset" nil t nil "-g" "ps"))
      (goto-char (point-min))
      (when (re-search-forward ;; Handle old typo in output.
             "\\(?:Currentl?y\\|Now\\) drawing from '\\(AC\\|Battery\\) Power'"
             nil t)
	(setq power-source (match-string 1))
        (when (re-search-forward (rx bol " -InternalBattery-0" (+ space)
                                     (* "(id=" (+ digit) ")" (+ space)))
                                 nil t)
	  (when (looking-at "\\([0-9]\\{1,3\\}\\)%")
	    (setq load-percentage (match-string 1))
	    (goto-char (match-end 0))
            (cond ((looking-at-p "; charging")
		   (setq battery-status "charging"
			 battery-status-symbol "+"))
		  ((< (string-to-number load-percentage) battery-load-critical)
		   (setq battery-status "critical"
			 battery-status-symbol "!"))
		  ((< (string-to-number load-percentage) battery-load-low)
		   (setq battery-status "low"
			 battery-status-symbol "-"))
		  (t
		   (setq battery-status "high"
			 battery-status-symbol "")))
	    (when (re-search-forward "\\(\\([0-9]+\\):\\([0-9]+\\)\\) remaining"  nil t)
	      (setq remaining-time (match-string 1))
	      (let ((h (string-to-number (match-string 2)))
		    (m (string-to-number (match-string 3))))
		(setq hours (number-to-string (+ h (if (< m 30) 0 1)))
		      minutes (number-to-string (+ (* h 60) m)))))))))
    (list (cons ?L (or power-source "N/A"))
	  (cons ?p (or load-percentage "N/A"))
	  (cons ?B (or battery-status "N/A"))
	  (cons ?b (or battery-status-symbol ""))
	  (cons ?h (or hours "N/A"))
	  (cons ?m (or minutes "N/A"))
	  (cons ?t (or remaining-time "N/A")))))

\f
;;; Private functions.

(defun battery-format (format alist)
  "Substitute %-sequences in FORMAT."
  (format-spec format alist 'delete))

(defun battery-search-for-one-match-in-files (files regexp match-num)
  "Search REGEXP in the content of the files listed in FILES.
If a match occurred, return the parenthesized expression numbered by
MATCH-NUM in the match.  Otherwise, return nil."
  (with-temp-buffer
    (catch 'found
      (dolist (file files)
	(and (ignore-errors (insert-file-contents file nil nil nil 'replace))
	     (re-search-forward regexp nil t)
	     (throw 'found (match-string match-num)))))))

\f
(provide 'battery)

;;; battery.el ends here

debug log:

solving 0fae92ab98 ...
found 0fae92ab98 in https://yhetil.org/emacs/87ilkyfhlo.fsf@elite.giraud/
found 72b3dfdae7 in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 72b3dfdae7c9b781581fcf8d4ed08e24b7210788	lisp/battery.el

applying [1/1] https://yhetil.org/emacs/87ilkyfhlo.fsf@elite.giraud/
diff --git a/lisp/battery.el b/lisp/battery.el
index 72b3dfdae7..0fae92ab98 100644

Checking patch lisp/battery.el...
Applied patch lisp/battery.el cleanly.

index at:
100644 0fae92ab981d487cf4baaa67467e944df3fab89f	lisp/battery.el

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/emacs.git
	https://git.savannah.gnu.org/cgit/emacs/org-mode.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.