lisp/type-break.el

   1 ;;; type-break.el --- encourage rests from typing at appropriate intervals  -*- lexical-binding: t -*-
   2
   3 ;; Copyright (C) 1994-1995, 1997, 2000-2018 Free Software Foundation,
   4 ;; Inc.
   5
   6 ;; Author: Noah Friedman
   7 ;; Maintainer: Noah Friedman <friedman@splode.com>
   8 ;; Keywords: extensions, timers
   9 ;; Created: 1994-07-13
  10
  11 ;; This file is part of GNU Emacs.
  12
  13 ;; GNU Emacs is free software: you can redistribute it and/or modify
  14 ;; it under the terms of the GNU General Public License as published by
  15 ;; the Free Software Foundation, either version 3 of the License, or
  16 ;; (at your option) any later version.
  17
  18 ;; GNU Emacs is distributed in the hope that it will be useful,
  19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 ;; GNU General Public License for more details.
  22
  23 ;; You should have received a copy of the GNU General Public License
  24 ;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
  25
  26 ;;; Commentary:
  27
  28 ;; The docstring for the function `type-break-mode' summarizes most of the
  29 ;; details of the interface.
  30
  31 ;; This package relies on the assumption that you live entirely in Emacs,
  32 ;; as the author does.  If that's not the case for you (e.g. you often
  33 ;; suspend Emacs or work in other windows) then this won't help very much;
  34 ;; it will depend on just how often you switch back to Emacs.  At the very
  35 ;; least, you will want to turn off the keystroke thresholds and rest
  36 ;; interval tracking.
  37
  38 ;; If you prefer not to be queried about taking breaks, but instead just
  39 ;; want to be reminded, do the following:
  40 ;;
  41 ;;   (setq type-break-query-mode nil)
  42 ;;
  43 ;; Or call the command `type-break-query-mode' with a negative prefix
  44 ;; argument.
  45
  46 ;; If you find echo area messages annoying and would prefer to see messages
  47 ;; in the mode line instead, do M-x type-break-mode-line-message-mode
  48 ;; or set the variable of the same name to t.
  49
  50 ;; This program can truly cons up a storm because of all the calls to
  51 ;; `current-time' (which always returns fresh conses).  I'm dismayed by
  52 ;; this, but I think the health of my hands is far more important than a
  53 ;; few pages of virtual memory.
  54
  55 ;; This program has no hope of working in Emacs 18.
  56
  57 ;; This package was inspired by Roland McGrath's hanoi-break.el.
  58 ;; Several people contributed feedback and ideas, including
  59 ;;      Roland McGrath <roland@gnu.org>
  60 ;;      Kleanthes Koniaris <kgk@koniaris.com>
  61 ;;      Mark Ashton <mpashton@gnu.org>
  62 ;;      Matt Wilding <wilding@cli.com>
  63 ;;      Robert S. Boyer <boyer@cs.utexas.edu>
  64
  65 ;;; Code:
  66
  67 \f
  68 (defgroup type-break nil
  69   "Encourage the user to take a rest from typing at suitable intervals."
  70   :prefix "type-break"
  71   :group 'keyboard)
  72
  73 (defcustom type-break-interval (* 60 60)
  74   "Number of seconds between scheduled typing breaks."
  75   :type 'integer
  76   :group 'type-break)
  77
  78 (defcustom type-break-good-rest-interval (/ type-break-interval 6)
  79   "Number of seconds of idle time considered to be an adequate typing rest.
  80
  81 When this variable is non-nil, Emacs checks the idle time between
  82 keystrokes.  If this idle time is long enough to be considered a \"good\"
  83 rest from typing, then the next typing break is simply rescheduled for later.
  84
  85 If a break is interrupted before this much time elapses, the user will be
  86 asked whether or not really to interrupt the break."
  87   :set-after '(type-break-interval)
  88   :type 'integer
  89   :group 'type-break)
  90
  91 (defcustom type-break-good-break-interval nil
  92   "Number of seconds considered to be an adequate explicit typing rest.
  93
  94 When this variable is non-nil, its value is considered to be a \"good\"
  95 length (in seconds) for a break initiated by the command `type-break',
  96 overriding `type-break-good-rest-interval'.  This provides querying of
  97 break interruptions when `type-break-good-rest-interval' is nil."
  98   :type '(choice (const nil) integer)
  99   :group 'type-break)
 100
 101 (defcustom type-break-keystroke-threshold
 102   ;; Assuming typing speed is 35wpm (on the average, do you really
 103   ;; type more than that in a minute?  I spend a lot of time reading mail
 104   ;; and simply studying code in buffers) and average word length is
 105   ;; about 5 letters, default upper threshold to the average number of
 106   ;; keystrokes one is likely to type in a break interval.  That way if the
 107   ;; user goes through a furious burst of typing activity, cause a typing
 108   ;; break to be required sooner than originally scheduled.
 109   ;; Conversely, the minimum threshold should be about a fifth of this.
 110   (let* ((wpm 35)
 111          (avg-word-length 5)
 112          (upper (* wpm avg-word-length (/ type-break-interval 60)))
 113          (lower (/ upper 5)))
 114     (cons lower upper))
 115   "Upper and lower bound on number of keystrokes for considering typing break.
 116 This structure is a pair of numbers (MIN . MAX).
 117
 118 The first number is the minimum number of keystrokes that must have been
 119 entered since the last typing break before considering another one, even if
 120 the scheduled time has elapsed; the break is simply rescheduled until later
 121 if the minimum threshold hasn't been reached.  If this first value is nil,
 122 then there is no minimum threshold; as soon as the scheduled time has
 123 elapsed, the user will always be queried.
 124
 125 The second number is the maximum number of keystrokes that can be entered
 126 before a typing break is requested immediately, pre-empting the originally
 127 scheduled break.  If this second value is nil, then no pre-emptive breaks
 128 will occur; only scheduled ones will.
 129
 130 Keys with bucky bits (shift, control, meta, etc) are counted as only one
 131 keystroke even though they really require multiple keys to generate them.
 132
 133 The command `type-break-guesstimate-keystroke-threshold' can be used to
 134 guess a reasonably good pair of values for this variable."
 135   :set-after '(type-break-interval)
 136   :type '(cons (choice integer (const nil)) (choice integer (const nil)))
 137   :group 'type-break)
 138
 139 (defcustom type-break-query-function 'yes-or-no-p
 140   "Function to use for making query for a typing break.
 141 It should take a string as an argument, the prompt.
 142 Usually this should be set to `yes-or-no-p' or `y-or-n-p'.
 143
 144 To avoid being queried at all, set `type-break-query-mode' to nil."
 145   :type '(radio function
 146                 (function-item yes-or-no-p)
 147                 (function-item y-or-n-p))
 148   :group 'type-break)
 149
 150 (defcustom type-break-query-interval 60
 151   "Number of seconds between queries to take a break, if put off.
 152 The user will continue to be prompted at this interval until he or she
 153 finally submits to taking a typing break."
 154   :type 'integer
 155   :group 'type-break)
 156
 157 (defcustom type-break-time-warning-intervals '(300 120 60 30)
 158   "List of time intervals for warnings about upcoming typing break.
 159 At each of the intervals (specified in seconds) away from a scheduled
 160 typing break, print a warning in the echo area."
 161   :type '(repeat integer)
 162   :group 'type-break)
 163
 164 (defcustom type-break-keystroke-warning-intervals '(300 200 100 50)
 165   "List of keystroke measurements for warnings about upcoming typing break.
 166 At each of the intervals (specified in keystrokes) away from the upper
 167 keystroke threshold, print a warning in the echo area.
 168 If either this variable or the upper threshold is set, then no warnings
 169 will occur."
 170   :type '(repeat integer)
 171   :group 'type-break)
 172
 173 (defcustom type-break-warning-repeat 40
 174   "Number of keystrokes for which warnings should be repeated.
 175 That is, for each of this many keystrokes the warning is redisplayed
 176 in the echo area to make sure it's really seen."
 177   :type 'integer
 178   :group 'type-break)
 179
 180 (defcustom type-break-time-stamp-format "[%H:%M] "
 181   "Timestamp format used to prefix messages.
 182 Format specifiers are as used by `format-time-string'."
 183   :type 'string
 184   :group 'type-break)
 185
 186 (defcustom type-break-demo-functions
 187   '(type-break-demo-boring type-break-demo-life type-break-demo-hanoi)
 188   "List of functions to consider running as demos during typing breaks.
 189 When a typing break begins, one of these functions is selected randomly
 190 to have Emacs do something interesting.
 191
 192 Any function in this list should start a demo which ceases as soon as a
 193 key is pressed."
 194   :type '(repeat function)
 195   :group 'type-break)
 196
 197 (defcustom type-break-demo-boring-stats nil
 198   "Show word per minute and keystroke figures in the Boring demo."
 199   :type 'boolean
 200   :group 'type-break)
 201
 202 (defcustom type-break-terse-messages nil
 203   "Use slightly terser messages."
 204   :type 'boolean
 205   :group 'type-break)
 206
 207 (defcustom type-break-file-name
 208   (locate-user-emacs-file "type-break" ".type-break")
 209   "Name of file used to save state across sessions.
 210 If this is nil, no data will be saved across sessions."
 211   :version "24.4"                       ; added locate-user
 212   :type 'file)
 213
 214 (defvar type-break-post-command-hook '(type-break-check)
 215   "Hook run indirectly by `post-command-hook' for typing break functions.
 216 This is not really intended to be set by the user, but it's probably
 217 harmless to do so.  Mainly it is used by various parts of the typing break
 218 program to delay actions until after the user has completed some command.
 219 It exists because `post-command-hook' itself is inaccessible while its
 220 functions are being run, and some type-break--related functions want to
 221 remove themselves after running.")
 222
 223 \f
 224 ;; Mode line frobs
 225
 226 (defvar type-break-mode-line-format
 227   '(type-break-mode-line-message-mode
 228     (""
 229      type-break-mode-line-break-message
 230      type-break-mode-line-warning))
 231   "Format of messages in the mode line concerning typing breaks.")
 232
 233 (defvar type-break-mode-line-break-message
 234   '(type-break-mode-line-break-message-p
 235     type-break-mode-line-break-string))
 236
 237 (defvar type-break-mode-line-break-message-p nil)
 238 (defvar type-break-mode-line-break-string " *** TAKE A TYPING BREAK NOW ***")
 239
 240 (defvar type-break-mode-line-warning
 241       '(type-break-mode-line-break-message-p
 242         ("")
 243         (type-break-warning-countdown-string
 244          (" *** "
 245           "Break in "
 246           type-break-warning-countdown-string
 247           " "
 248           type-break-warning-countdown-string-type
 249           "***"))))
 250
 251 (defvar type-break-warning-countdown-string nil
 252   "If non-nil, this is a countdown for the next typing break.
 253
 254 This variable, in conjunction with `type-break-warning-countdown-string-type'
 255 \(which indicates whether this value is a number of keystrokes or seconds)
 256 is installed in `mode-line-format' to notify of imminent typing breaks.")
 257
 258 (defvar type-break-warning-countdown-string-type nil
 259   "Indicates the unit type of `type-break-warning-countdown-string'.
 260 It will be either \"seconds\" or \"keystrokes\".")
 261
 262 \f
 263 ;; These are internal variables.  Do not set them yourself.
 264
 265 (defvar type-break-alarm-p nil)
 266 (defvar type-break-keystroke-count 0)
 267 (defvar type-break-time-last-break nil)
 268 (defvar type-break-time-next-break nil)
 269 (defvar type-break-time-last-command (current-time))
 270 (defvar type-break-current-time-warning-interval nil)
 271 (defvar type-break-current-keystroke-warning-interval nil)
 272 (defvar type-break-time-warning-count 0)
 273 (defvar type-break-keystroke-warning-count 0)
 274 (defvar type-break-interval-start nil)
 275
 276 \f
 277 ;;;###autoload
 278 (define-minor-mode type-break-mode
 279   "Enable or disable typing-break mode.
 280 This is a minor mode, but it is global to all buffers by default.
 281
 282 When this mode is enabled, the user is encouraged to take typing breaks at
 283 appropriate intervals; either after a specified amount of time or when the
 284 user has exceeded a keystroke threshold.  When the time arrives, the user
 285 is asked to take a break.  If the user refuses at that time, Emacs will ask
 286 again in a short period of time.  The idea is to give the user enough time
 287 to find a good breaking point in his or her work, but be sufficiently
 288 annoying to discourage putting typing breaks off indefinitely.
 289
 290 A negative prefix argument disables this mode.
 291 No argument or any non-negative argument enables it.
 292
 293 The user may enable or disable this mode by setting the variable of the
 294 same name, though setting it in that way doesn't reschedule a break or
 295 reset the keystroke counter.
 296
 297 If the mode was previously disabled and is enabled as a consequence of
 298 calling this function, it schedules a break with `type-break-schedule' to
 299 make sure one occurs (the user can call that command to reschedule the
 300 break at any time).  It also initializes the keystroke counter.
 301
 302 The variable `type-break-interval' specifies the number of seconds to
 303 schedule between regular typing breaks.  This variable doesn't directly
 304 affect the time schedule; it simply provides a default for the
 305 `type-break-schedule' command.
 306
 307 If set, the variable `type-break-good-rest-interval' specifies the minimum
 308 amount of time which is considered a reasonable typing break.  Whenever
 309 that time has elapsed, typing breaks are automatically rescheduled for
 310 later even if Emacs didn't prompt you to take one first.  Also, if a break
 311 is ended before this much time has elapsed, the user will be asked whether
 312 or not to continue.  A nil value for this variable prevents automatic
 313 break rescheduling, making `type-break-interval' an upper bound on the time
 314 between breaks.  In this case breaks will be prompted for as usual before
 315 the upper bound if the keystroke threshold is reached.
 316
 317 If `type-break-good-rest-interval' is nil and
 318 `type-break-good-break-interval' is set, then confirmation is required to
 319 interrupt a break before `type-break-good-break-interval' seconds
 320 have passed.  This provides for an upper bound on the time between breaks
 321 together with confirmation of interruptions to these breaks.
 322
 323 The variable `type-break-keystroke-threshold' is used to determine the
 324 thresholds at which typing breaks should be considered.  You can use
 325 the command `type-break-guesstimate-keystroke-threshold' to try to
 326 approximate good values for this.
 327
 328 There are several variables that affect how or when warning messages about
 329 imminent typing breaks are displayed.  They include:
 330
 331         `type-break-mode-line-message-mode'
 332         `type-break-time-warning-intervals'
 333         `type-break-keystroke-warning-intervals'
 334         `type-break-warning-repeat'
 335         `type-break-warning-countdown-string'
 336         `type-break-warning-countdown-string-type'
 337
 338 There are several variables that affect if, how, and when queries to begin
 339 a typing break occur.  They include:
 340
 341         `type-break-query-mode'
 342         `type-break-query-function'
 343         `type-break-query-interval'
 344
 345 The command `type-break-statistics' prints interesting things.
 346
 347 Finally, a file (named `type-break-file-name') is used to store information
 348 across Emacs sessions.  This provides recovery of the break status between
 349 sessions and after a crash.  Manual changes to the file may result in
 350 problems."
 351   :lighter type-break-mode-line-format
 352   :global t
 353
 354   (type-break-check-post-command-hook)
 355
 356   (cond
 357    ;; ((and already-enabled type-break-mode)
 358    ;;  (and (called-interactively-p 'interactive)
 359    ;;       (message "Type Break mode is already enabled")))
 360    (type-break-mode
 361     (when type-break-file-name
 362       (with-current-buffer (find-file-noselect type-break-file-name 'nowarn)
 363         (setq buffer-save-without-query t)))
 364
 365     (or global-mode-string (setq global-mode-string '(""))) ;FIXME: Why?
 366     (type-break-keystroke-reset)
 367     (type-break-mode-line-countdown-or-break nil)
 368
 369     (setq type-break-time-last-break
 370           (or (type-break-get-previous-time)
 371               (current-time)))
 372
 373     ;; Schedule according to break time from session file.
 374     (type-break-schedule
 375      (let (diff)
 376        (if (and type-break-time-last-break
 377                 (< (setq diff (type-break-time-difference
 378                                type-break-time-last-break
 379                                nil))
 380                    type-break-interval))
 381            ;; Use the file's value.
 382            (progn
 383              (setq type-break-keystroke-count
 384                    (type-break-get-previous-count))
 385              ;; File the time, in case it was read from the auto-save file.
 386              (type-break-file-time type-break-interval-start)
 387              (setq type-break-interval-start type-break-time-last-break)
 388              (- type-break-interval diff))
 389          ;; Schedule from now.
 390          (setq type-break-interval-start (current-time))
 391          (type-break-file-time type-break-interval-start)
 392          type-break-interval))
 393      type-break-interval-start
 394      type-break-interval))
 395    (t
 396     (type-break-keystroke-reset)
 397     (type-break-mode-line-countdown-or-break nil)
 398     (type-break-cancel-schedule)
 399     (do-auto-save)
 400     (when type-break-file-name
 401       (with-current-buffer (find-file-noselect type-break-file-name
 402                                                'nowarn)
 403         (set-buffer-modified-p nil)
 404         (unlock-buffer)
 405         (kill-current-buffer))))))
 406
 407 (define-minor-mode type-break-mode-line-message-mode
 408   "Toggle warnings about typing breaks in the mode line.
 409 With a prefix argument ARG, enable these warnings if ARG is
 410 positive, and disable them otherwise.  If called from Lisp,
 411 enable them if ARG is omitted or nil.
 412
 413 The user may also enable or disable this mode simply by setting
 414 the variable of the same name.
 415
 416 Variables controlling the display of messages in the mode line include:
 417
 418         `mode-line-format'
 419         `global-mode-string'
 420         `type-break-mode-line-break-message'
 421         `type-break-mode-line-warning'"
 422   :global t :group 'type-break)
 423
 424 (define-minor-mode type-break-query-mode
 425   "Toggle typing break queries.
 426 With a prefix argument ARG, enable these queries if ARG is
 427 positive, and disable them otherwise.  If called from Lisp,
 428 enable them if ARG is omitted or nil.
 429
 430 The user may also enable or disable this mode simply by setting
 431 the variable of the same name."
 432   :global t :group 'type-break)
 433
 434 \f
 435 ;;; session file functions
 436
 437 (defvar type-break-auto-save-file-name
 438   (let ((buffer-file-name type-break-file-name))
 439     (make-auto-save-file-name))
 440   "Auto-save name of `type-break-file-name'.")
 441
 442 (defun type-break-file-time (&optional time)
 443   "File break time in `type-break-file-name', unless the file is locked."
 444   (if (and type-break-file-name
 445            (not (stringp (file-locked-p type-break-file-name))))
 446       (with-current-buffer (find-file-noselect type-break-file-name
 447                                                'nowarn)
 448         (let ((inhibit-read-only t))
 449           (erase-buffer)
 450           (insert (format "%s\n\n" (or time type-break-interval-start)))
 451           ;; file saving is left to auto-save
 452           ))))
 453
 454 (defun type-break-file-keystroke-count ()
 455   "File keystroke count in `type-break-file-name', unless the file is locked."
 456   (if (and type-break-file-name
 457            (not (stringp (file-locked-p type-break-file-name))))
 458       ;; Prevent deactivation of the mark in some other buffer.
 459       (let (deactivate-mark)
 460         (with-current-buffer (find-file-noselect type-break-file-name
 461                                                  'nowarn)
 462           (save-excursion
 463             (let ((inhibit-read-only t))
 464               (goto-char (point-min))
 465               (forward-line)
 466               (delete-region (point) (line-end-position))
 467               (insert (format "%s" type-break-keystroke-count))
 468               ;; file saving is left to auto-save
 469               ))))))
 470
 471 (defun timep (time)
 472   "If TIME is in the format returned by `current-time' then
 473 return TIME, else return nil."
 474   (condition-case nil
 475       (and (float-time time) time)
 476     (error nil)))
 477
 478 (defun type-break-choose-file ()
 479   "Return file to read from."
 480   (cond
 481    ((not type-break-file-name)
 482     nil)
 483    ((and (file-exists-p type-break-auto-save-file-name)
 484          (file-readable-p type-break-auto-save-file-name))
 485     type-break-auto-save-file-name)
 486    ((and (file-exists-p type-break-file-name)
 487          (file-readable-p type-break-file-name))
 488     type-break-file-name)
 489    (t nil)))
 490
 491 (defun type-break-get-previous-time ()
 492   "Get previous break time from `type-break-file-name'.
 493 Returns nil if the file is missing or if the time breaks with the
 494 `current-time' format."
 495   (let ((file (type-break-choose-file)))
 496     (if file
 497         (timep ;; returns expected format, else nil
 498          (with-current-buffer (find-file-noselect file 'nowarn)
 499            (condition-case nil
 500                (save-excursion
 501                  (goto-char (point-min))
 502                  (read (current-buffer)))
 503              (end-of-file
 504               (error "End of file in `%s'" file))))))))
 505
 506 (defun type-break-get-previous-count ()
 507   "Get previous keystroke count from `type-break-file-name'.
 508 Return 0 if the file is missing or if the form read is not an
 509 integer."
 510   (let ((file (type-break-choose-file)))
 511     (if (and file
 512              (integerp
 513               (setq file
 514                     (with-current-buffer
 515                         (find-file-noselect file 'nowarn)
 516                     (condition-case nil
 517                         (save-excursion
 518                           (goto-char (point-min))
 519                           (forward-line 1)
 520                           (read (current-buffer)))
 521                       (end-of-file
 522                        (error "End of file in `%s'" file)))))))
 523         file
 524       0)))
 525
 526 \f
 527 ;;;###autoload
 528 (defun type-break ()
 529   "Take a typing break.
 530
 531 During the break, a demo selected from the functions listed in
 532 `type-break-demo-functions' is run.
 533
 534 After the typing break is finished, the next break is scheduled
 535 as per the function `type-break-schedule'."
 536   (interactive)
 537   (do-auto-save)
 538   (type-break-cancel-schedule)
 539   ;; remove any query scheduled during interactive invocation
 540   (remove-hook 'type-break-post-command-hook 'type-break-do-query)
 541   (let ((continue t)
 542         (start-time (current-time)))
 543     (setq type-break-time-last-break start-time)
 544     (while continue
 545       (save-window-excursion
 546         ;; Eat the screen.
 547         (and (eq (selected-window) (minibuffer-window))
 548              (other-window 1))
 549         (delete-other-windows)
 550         (scroll-right (window-width))
 551         (unless type-break-terse-messages
 552           (message "Press any key to resume from typing break."))
 553
 554         (let* ((len (length type-break-demo-functions))
 555                (idx (random len))
 556                (fn (nth idx type-break-demo-functions)))
 557           (condition-case ()
 558               (funcall fn)
 559             (error nil))))
 560
 561       (let ((good-interval (or type-break-good-rest-interval
 562                                type-break-good-break-interval)))
 563         (cond
 564          (good-interval
 565           (let ((break-secs (type-break-time-difference
 566                              start-time nil)))
 567             (cond
 568              ((>= break-secs good-interval)
 569               (setq continue nil))
 570              ;; 60 seconds may be too much leeway if the break is only 3
 571              ;; minutes to begin with.  You can just say "no" to the query
 572              ;; below if you're in that much of a hurry.
 573              ;;((> 60 (abs (- break-secs good-interval)))
 574              ;; (setq continue nil))
 575              ((funcall
 576                type-break-query-function
 577                (format
 578                 (if type-break-terse-messages
 579                     "%s%s remaining.  Continue break? "
 580                   "%sYou really ought to rest %s more.  Continue break? ")
 581                 (type-break-time-stamp)
 582                 (type-break-format-time (- good-interval
 583                                            break-secs)))))
 584              (t
 585               (setq continue nil)))))
 586          (t (setq continue nil))))))
 587
 588   (type-break-keystroke-reset)
 589   (type-break-file-time)
 590   (type-break-mode-line-countdown-or-break nil)
 591   (type-break-schedule))
 592
 593 \f
 594 (defun type-break-schedule (&optional time start interval)
 595   "Schedule a typing break for TIME seconds from now.
 596 If time is not specified it defaults to `type-break-interval'.
 597 START and INTERVAL are used when recovering a break.
 598 START is the start of the break (defaults to now).
 599 INTERVAL is the full length of an interval (defaults to TIME)."
 600   (interactive (list (and current-prefix-arg
 601                           (prefix-numeric-value current-prefix-arg))))
 602   (or time (setq time type-break-interval))
 603   (type-break-check-post-command-hook)
 604   (type-break-cancel-schedule)
 605   (type-break-time-warning-schedule time 'reset)
 606   (type-break-run-at-time (max 1 time) nil 'type-break-alarm)
 607   (setq type-break-time-next-break
 608         (type-break-time-sum start (or interval time))))
 609
 610 (defun type-break-cancel-schedule ()
 611   (type-break-cancel-time-warning-schedule)
 612   (type-break-cancel-function-timers 'type-break-alarm)
 613   (setq type-break-alarm-p nil)
 614   (setq type-break-time-next-break nil))
 615
 616 (defun type-break-time-warning-schedule (&optional time resetp)
 617   (let ((type-break-current-time-warning-interval nil))
 618     (type-break-cancel-time-warning-schedule))
 619   (add-hook 'type-break-post-command-hook 'type-break-time-warning 'append)
 620   (cond
 621    (type-break-time-warning-intervals
 622     (and resetp
 623          (setq type-break-current-time-warning-interval
 624                type-break-time-warning-intervals))
 625
 626     (or time
 627         (setq time (type-break-time-difference nil
 628                                                type-break-time-next-break)))
 629
 630     (while (and type-break-current-time-warning-interval
 631                 (> (car type-break-current-time-warning-interval) time))
 632       (setq type-break-current-time-warning-interval
 633             (cdr type-break-current-time-warning-interval)))
 634
 635     (cond
 636      (type-break-current-time-warning-interval
 637       (setq time (- time (car type-break-current-time-warning-interval)))
 638       (setq type-break-current-time-warning-interval
 639             (cdr type-break-current-time-warning-interval))
 640
 641       ;(let (type-break-current-time-warning-interval)
 642       ;  (type-break-cancel-time-warning-schedule))
 643       (type-break-run-at-time (max 1 time) nil 'type-break-time-warning-alarm)
 644
 645       (cond
 646        (resetp
 647         (setq type-break-warning-countdown-string nil))
 648        (t
 649         (setq type-break-warning-countdown-string (number-to-string time))
 650         (setq type-break-warning-countdown-string-type "seconds"))))))))
 651
 652 (defun type-break-cancel-time-warning-schedule ()
 653   (type-break-cancel-function-timers 'type-break-time-warning-alarm)
 654   (remove-hook 'type-break-post-command-hook 'type-break-time-warning)
 655   (setq type-break-current-time-warning-interval
 656         type-break-time-warning-intervals)
 657   (setq type-break-time-warning-count 0) ; avoid warnings after break
 658   (setq type-break-warning-countdown-string nil))
 659
 660 (defun type-break-alarm ()
 661   (type-break-check-post-command-hook)
 662   (setq type-break-alarm-p t)
 663   (type-break-mode-line-countdown-or-break 'break))
 664
 665 (defun type-break-time-warning-alarm ()
 666   (type-break-check-post-command-hook)
 667   (type-break-time-warning-schedule)
 668   (setq type-break-time-warning-count type-break-warning-repeat)
 669   (type-break-time-warning)
 670   (type-break-mode-line-countdown-or-break 'countdown))
 671
 672 \f
 673 (defun type-break-run-tb-post-command-hook ()
 674   (and type-break-mode
 675        (run-hooks 'type-break-post-command-hook)))
 676
 677 (defun type-break-check ()
 678   "Ask to take a typing break if appropriate.
 679 This may be the case either because the scheduled time has come \(and the
 680 minimum keystroke threshold has been reached) or because the maximum
 681 keystroke threshold has been exceeded."
 682   (type-break-file-keystroke-count)
 683   (let* ((min-threshold (car type-break-keystroke-threshold))
 684          (max-threshold (cdr type-break-keystroke-threshold)))
 685     (and type-break-good-rest-interval
 686          (progn
 687            (and (> (type-break-time-difference
 688                     type-break-time-last-command nil)
 689                    type-break-good-rest-interval)
 690                 (progn
 691                   (type-break-keystroke-reset)
 692                   (type-break-mode-line-countdown-or-break nil)
 693                   (setq type-break-time-last-break (current-time))
 694                   (type-break-schedule)))
 695            (setq type-break-time-last-command (current-time))))
 696
 697     (and type-break-keystroke-threshold
 698          (let ((keys (this-command-keys)))
 699            (cond
 700             ;; Ignore mouse motion
 701             ((and (vectorp keys)
 702                   (consp (aref keys 0))
 703                   (memq (car (aref keys 0)) '(mouse-movement))))
 704             (t
 705              (setq type-break-keystroke-count
 706                    (+ type-break-keystroke-count (length keys)))))))
 707
 708     (cond
 709      (type-break-alarm-p
 710       (cond
 711        ((input-pending-p))
 712        ((eq (selected-window) (minibuffer-window)))
 713        ((and min-threshold
 714              (< type-break-keystroke-count min-threshold))
 715         (type-break-schedule))
 716        (t
 717         ;; If keystroke count is within min-threshold of
 718         ;; max-threshold, lower it to reduce the likelihood of an
 719         ;; immediate subsequent query.
 720         (and max-threshold
 721              min-threshold
 722              (< (- max-threshold type-break-keystroke-count) min-threshold)
 723              (progn
 724                (type-break-keystroke-reset)
 725                (setq type-break-keystroke-count min-threshold)))
 726         (type-break-query))))
 727      ((and type-break-keystroke-warning-intervals
 728            max-threshold
 729            (= type-break-keystroke-warning-count 0)
 730            (type-break-check-keystroke-warning)))
 731      ((and max-threshold
 732            (> type-break-keystroke-count max-threshold)
 733            (not (input-pending-p))
 734            (not (eq (selected-window) (minibuffer-window))))
 735       (type-break-keystroke-reset)
 736       (setq type-break-keystroke-count (or min-threshold 0))
 737       (type-break-query)))))
 738
 739 ;; This should return t if warnings were enabled, nil otherwise.
 740 (defun type-break-check-keystroke-warning ()
 741   ;; This is safe because the caller should have checked that the cdr was
 742   ;; non-nil already.
 743   (let ((left (- (cdr type-break-keystroke-threshold)
 744                  type-break-keystroke-count)))
 745     (cond
 746      ((null (car type-break-current-keystroke-warning-interval))
 747       nil)
 748      ((> left (car type-break-current-keystroke-warning-interval))
 749       nil)
 750      (t
 751       (while (and (car type-break-current-keystroke-warning-interval)
 752                   (< left (car type-break-current-keystroke-warning-interval)))
 753         (setq type-break-current-keystroke-warning-interval
 754               (cdr type-break-current-keystroke-warning-interval)))
 755       (setq type-break-keystroke-warning-count type-break-warning-repeat)
 756       (add-hook 'type-break-post-command-hook 'type-break-keystroke-warning)
 757       (setq type-break-warning-countdown-string (number-to-string left))
 758       (setq type-break-warning-countdown-string-type "keystrokes")
 759       (type-break-mode-line-countdown-or-break 'countdown)
 760       t))))
 761
 762 ;; Arrange for a break query to be made, when the user stops typing furiously.
 763 (defun type-break-query ()
 764   (add-hook 'type-break-post-command-hook 'type-break-do-query))
 765
 766 (defun type-break-do-query ()
 767   (cond
 768    ((not type-break-query-mode)
 769     (type-break-noninteractive-query)
 770     (type-break-schedule type-break-query-interval)
 771     (remove-hook 'type-break-post-command-hook 'type-break-do-query))
 772    ((sit-for 2)
 773     (condition-case ()
 774         (cond
 775          ((let ((type-break-mode nil)
 776                 ;; yes-or-no-p sets this-command to exit-minibuffer,
 777                 ;; which hoses undo or yank-pop (if you happened to be
 778                 ;; yanking just when the query occurred).
 779                 (this-command this-command))
 780             ;; Cancel schedule to prevent possibility of a second query
 781             ;; from taking place before this one has even returned.
 782             ;; The condition-case wrapper will reschedule on quit.
 783             (type-break-cancel-schedule)
 784             ;; Also prevent a second query when the break is interrupted.
 785             (remove-hook 'type-break-post-command-hook 'type-break-do-query)
 786             (funcall type-break-query-function
 787                      (format "%s%s"
 788                              (type-break-time-stamp)
 789                              (if type-break-terse-messages
 790                                  "Break now? "
 791                                "Take a break from typing now? "))))
 792           (type-break))
 793          (t
 794           (type-break-schedule type-break-query-interval)))
 795       (quit
 796        (type-break-schedule type-break-query-interval))))))
 797
 798 (defun type-break-noninteractive-query (&optional _ignored-args)
 799   "Null query function which doesn't interrupt user and assumes `no'.
 800 It prints a reminder in the echo area to take a break, but doesn't enforce
 801 this or ask the user to start one right now."
 802   (cond
 803    (type-break-mode-line-message-mode)
 804    (t
 805     (beep t)
 806     (message "%sYou should take a typing break now.  Do `%s'."
 807              (type-break-time-stamp)
 808              (substitute-command-keys "\\[type-break]"))
 809     (sit-for 1)
 810     (beep t)
 811     ;; return nil so query caller knows to reset reminder, as if user
 812     ;; said "no" in response to yes-or-no-p.
 813     nil)))
 814
 815 (defun type-break-time-warning ()
 816   (cond
 817    ((and (car type-break-keystroke-threshold)
 818          (< type-break-keystroke-count (car type-break-keystroke-threshold))))
 819    ((> type-break-time-warning-count 0)
 820     (let ((timeleft (type-break-time-difference (current-time)
 821                                                 type-break-time-next-break)))
 822       (setq type-break-warning-countdown-string (number-to-string timeleft))
 823       (cond
 824        ((eq (selected-window) (minibuffer-window)))
 825        ;; Do nothing if the command was just a prefix arg, since that will
 826        ;; immediately be followed by some other interactive command.
 827        ;; Otherwise, it is particularly annoying for the sit-for below to
 828        ;; delay redisplay when one types sequences like `C-u -1 C-l'.
 829        ((memq this-command '(digit-argument universal-argument)))
 830        ((not type-break-mode-line-message-mode)
 831         ;; Pause for a moment so any previous message can be seen.
 832         (sit-for 2)
 833         (message "%sWarning: typing break due in %s."
 834                  (type-break-time-stamp)
 835                  (type-break-format-time timeleft))
 836         (setq type-break-time-warning-count
 837               (1- type-break-time-warning-count))))))
 838    (t
 839     (remove-hook 'type-break-post-command-hook 'type-break-time-warning)
 840     (setq type-break-warning-countdown-string nil))))
 841
 842 (defun type-break-keystroke-warning ()
 843   (cond
 844    ((> type-break-keystroke-warning-count 0)
 845     (setq type-break-warning-countdown-string
 846           (number-to-string (- (cdr type-break-keystroke-threshold)
 847                                type-break-keystroke-count)))
 848     (cond
 849      ((eq (selected-window) (minibuffer-window)))
 850      ;; Do nothing if the command was just a prefix arg, since that will
 851      ;; immediately be followed by some other interactive command.
 852      ;; Otherwise, it is particularly annoying for the sit-for below to
 853      ;; delay redisplay when one types sequences like `C-u -1 C-l'.
 854      ((memq this-command '(digit-argument universal-argument)))
 855      ((not type-break-mode-line-message-mode)
 856       (sit-for 2)
 857       (message "%sWarning: typing break due in %s keystrokes."
 858                (type-break-time-stamp)
 859                (- (cdr type-break-keystroke-threshold)
 860                   type-break-keystroke-count))
 861       (setq type-break-keystroke-warning-count
 862             (1- type-break-keystroke-warning-count)))))
 863    (t
 864     (remove-hook 'type-break-post-command-hook
 865                  'type-break-keystroke-warning)
 866     (setq type-break-warning-countdown-string nil))))
 867
 868 (defun type-break-mode-line-countdown-or-break (&optional type)
 869   (cond
 870    ((not type-break-mode-line-message-mode))
 871    ((eq type 'countdown)
 872     ;(setq type-break-mode-line-break-message-p nil)
 873     (add-hook 'type-break-post-command-hook
 874               'type-break-force-mode-line-update 'append))
 875    ((eq type 'break)
 876     ;; Alternate
 877     (setq type-break-mode-line-break-message-p
 878           (not type-break-mode-line-break-message-p))
 879     (remove-hook 'type-break-post-command-hook
 880                  'type-break-force-mode-line-update))
 881    (t
 882     (setq type-break-mode-line-break-message-p nil)
 883     (setq type-break-warning-countdown-string nil)
 884     (remove-hook 'type-break-post-command-hook
 885                  'type-break-force-mode-line-update)))
 886   (type-break-force-mode-line-update))
 887
 888 \f
 889 ;;;###autoload
 890 (defun type-break-statistics ()
 891   "Print statistics about typing breaks in a temporary buffer.
 892 This includes the last time a typing break was taken, when the next one is
 893 scheduled, the keystroke thresholds and the current keystroke count, etc."
 894   (interactive)
 895   (with-output-to-temp-buffer "*Typing Break Statistics*"
 896     (princ (format "Typing break statistics\n-----------------------\n
 897 Typing break mode is currently %s.
 898 Interactive query for breaks is %s.
 899 Warnings of imminent typing breaks in mode line is %s.
 900
 901 Last typing break ended     : %s
 902 Next scheduled typing break : %s\n
 903 Minimum keystroke threshold : %s
 904 Maximum keystroke threshold : %s
 905 Current keystroke count     : %s"
 906                    (if type-break-mode "enabled" "disabled")
 907                    (if type-break-query-mode "enabled" "disabled")
 908                    (if type-break-mode-line-message-mode "enabled" "disabled")
 909                    (if type-break-time-last-break
 910                        (current-time-string type-break-time-last-break)
 911                      "never")
 912                    (if (and type-break-mode type-break-time-next-break)
 913                        (format "%s\t(%s from now)"
 914                                (current-time-string type-break-time-next-break)
 915                                (type-break-format-time
 916                                 (type-break-time-difference
 917                                 (current-time)
 918                                 type-break-time-next-break)))
 919                      "none scheduled")
 920                    (or (car type-break-keystroke-threshold) "none")
 921                    (or (cdr type-break-keystroke-threshold) "none")
 922                    type-break-keystroke-count))))
 923
 924 ;;;###autoload
 925 (defun type-break-guesstimate-keystroke-threshold (wpm &optional wordlen frac)
 926   "Guess values for the minimum/maximum keystroke threshold for typing breaks.
 927
 928 If called interactively, the user is prompted for their guess as to how
 929 many words per minute they usually type.  This value should not be your
 930 maximum WPM, but your average.  Of course, this is harder to gauge since it
 931 can vary considerably depending on what you are doing.  For example, one
 932 tends to type less when debugging a program as opposed to writing
 933 documentation.  (Perhaps a separate program should be written to estimate
 934 average typing speed.)
 935
 936 From that, this command sets the values in `type-break-keystroke-threshold'
 937 based on a fairly simple algorithm involving assumptions about the average
 938 length of words (5).  For the minimum threshold, it uses about a fifth of
 939 the computed maximum threshold.
 940
 941 When called from Lisp programs, the optional args WORDLEN and FRAC can be
 942 used to override the default assumption about average word length and the
 943 fraction of the maximum threshold to which to set the minimum threshold.
 944 FRAC should be the inverse of the fractional value; for example, a value of
 945 2 would mean to use one half, a value of 4 would mean to use one quarter, etc."
 946   (interactive "NOn average, how many words per minute do you type? ")
 947   (let* ((upper (* wpm (or wordlen 5) (/ type-break-interval 60)))
 948          (lower (/ upper (or frac 5))))
 949     (or type-break-keystroke-threshold
 950         (setq type-break-keystroke-threshold (cons nil nil)))
 951     (setcar type-break-keystroke-threshold lower)
 952     (setcdr type-break-keystroke-threshold upper)
 953     (if (called-interactively-p 'interactive)
 954         (message "min threshold: %d\tmax threshold: %d" lower upper))
 955     type-break-keystroke-threshold))
 956
 957 \f
 958 ;;; misc functions
 959
 960 ;; Compute the difference, in seconds, between a and b, two structures
 961 ;; similar to those returned by `current-time'.
 962 (defun type-break-time-difference (a b)
 963   (round (float-time (time-subtract b a))))
 964
 965 ;; Return a time value that is the sum of the time-value arguments.
 966 (defun type-break-time-sum (&rest tmlist)
 967   (let ((sum '(0 0)))
 968     (dolist (tem tmlist)
 969       (setq sum (time-add sum tem)))
 970     sum))
 971
 972 (defun type-break-time-stamp (&optional when)
 973   (if (fboundp 'format-time-string)
 974       (format-time-string type-break-time-stamp-format when)
 975     ;; Emacs 19.28 and prior do not have format-time-string.
 976     ;; In that case, result is not customizable.  Upgrade today!
 977     (format "[%s] " (substring (current-time-string when) 11 16))))
 978
 979 (defun type-break-format-time (secs)
 980   (let ((mins (/ secs 60)))
 981     (cond
 982      ((= mins 1) (format "%d minute" mins))
 983      ((> mins 0) (format "%d minutes" mins))
 984      ((= secs 1) (format "%d second" secs))
 985      (t (format "%d seconds" secs)))))
 986
 987 (defun type-break-keystroke-reset ()
 988   (setq type-break-interval-start (current-time)) ; not a keystroke
 989   (setq type-break-keystroke-count 0)
 990   (setq type-break-keystroke-warning-count 0)
 991   (setq type-break-current-keystroke-warning-interval
 992         type-break-keystroke-warning-intervals)
 993   (remove-hook 'type-break-post-command-hook 'type-break-keystroke-warning))
 994
 995 (defun type-break-force-mode-line-update (&optional all)
 996   "Force the mode-line of the current buffer to be redisplayed.
 997 With optional non-nil ALL, force redisplay of all mode-lines."
 998   (and all (with-current-buffer (other-buffer)))
 999   (set-buffer-modified-p (buffer-modified-p)))
1000
1001 ;; If an exception occurs in Emacs while running the post command hook, the
1002 ;; value of that hook is clobbered.  This is because the value of the
1003 ;; variable is temporarily set to nil while it's running to prevent
1004 ;; recursive application, but it also means an exception aborts the routine
1005 ;; of restoring it.  This function is called from the timers to restore it,
1006 ;; just in case.
1007 (defun type-break-check-post-command-hook ()
1008   (add-hook 'post-command-hook 'type-break-run-tb-post-command-hook 'append))
1009
1010 \f
1011 ;;; Timer wrapper functions
1012 ;;
1013 ;; These shield type-break from variations in the interval timer packages
1014 ;; for different versions of Emacs.
1015
1016 (defun type-break-run-at-time (time repeat function)
1017   (condition-case nil (or (require 'timer) (require 'itimer)) (error nil))
1018   (run-at-time time repeat function))
1019
1020 (defvar timer-dont-exit)
1021 (defun type-break-cancel-function-timers (function)
1022   (let ((timer-dont-exit t))
1023     (cancel-function-timers function)))
1024
1025 \f
1026 ;;; Demo wrappers
1027
1028 (defun type-break-catch-up-event ()
1029   ;; If the last input event is a down-event, read and discard the
1030   ;; corresponding up-event too, to avoid triggering another prompt.
1031   (and (eventp last-input-event)
1032        (memq 'down (event-modifiers last-input-event))
1033        (read-event)))
1034
1035 ;; This is a wrapper around hanoi that calls it with an arg large enough to
1036 ;; make the largest discs possible that will fit in the window.
1037 ;; Also, clean up the *Hanoi* buffer after we're done.
1038 (defun type-break-demo-hanoi ()
1039   "Take a hanoiing typing break."
1040   (and (get-buffer "*Hanoi*")
1041        (kill-buffer "*Hanoi*"))
1042   (condition-case ()
1043       (progn
1044         (hanoi (/ (window-width) 8))
1045         ;; Wait for user to come back.
1046         (read-event)
1047         (type-break-catch-up-event)
1048         (kill-buffer "*Hanoi*"))
1049     (quit
1050      (read-event)
1051      (type-break-catch-up-event)
1052      (and (get-buffer "*Hanoi*")
1053           (kill-buffer "*Hanoi*")))))
1054
1055 ;; This is a wrapper around life that calls it with a `sleep' arg to make
1056 ;; it run a little more leisurely.
1057 ;; Also, clean up the *Life* buffer after we're done.
1058 (defun type-break-demo-life ()
1059   "Take a typing break and get a life."
1060   (let ((continue t))
1061     (while continue
1062       (setq continue nil)
1063       (and (get-buffer "*Life*")
1064            (kill-buffer "*Life*"))
1065       (condition-case ()
1066           (progn
1067             (life 3)
1068             ;; wait for user to return
1069             (read-event)
1070             (type-break-catch-up-event)
1071             (kill-buffer "*Life*"))
1072         (life-extinct
1073          (message "%s" (get 'life-extinct 'error-message))
1074          ;; restart demo
1075          (setq continue t))
1076         (quit
1077          (type-break-catch-up-event)
1078          (and (get-buffer "*Life*")
1079               (kill-buffer "*Life*")))))))
1080
1081 ;; Boring demo, but doesn't use many cycles
1082 (defun type-break-demo-boring ()
1083   "Boring typing break demo."
1084   (let ((rmsg (if type-break-terse-messages
1085                   ""
1086                 "Press any key to resume from typing break"))
1087         (buffer-name "*Typing Break Buffer*")
1088         lines elapsed timeleft tmsg)
1089     (condition-case ()
1090         (progn
1091           (switch-to-buffer (get-buffer-create buffer-name))
1092           (buffer-disable-undo (current-buffer))
1093           (setq lines (/ (window-body-height) 2))
1094           (unless type-break-terse-messages (setq lines (1- lines)))
1095           (if type-break-demo-boring-stats
1096               (setq lines (- lines 2)))
1097           (setq lines (make-string lines ?\C-j))
1098           (while (not (input-pending-p))
1099             (erase-buffer)
1100             (setq elapsed (type-break-time-difference
1101                            type-break-time-last-break
1102                            (current-time)))
1103             (let ((good-interval (or type-break-good-rest-interval
1104                                      type-break-good-break-interval)))
1105               (cond
1106                (good-interval
1107                 (setq timeleft (- good-interval elapsed))
1108                 (if (> timeleft 0)
1109                     (setq tmsg
1110                           (format (if type-break-terse-messages
1111                                       "Break remaining: %s"
1112                                     "You should rest for %s more")
1113                                   (type-break-format-time timeleft)))
1114                   (setq tmsg
1115                         (format (if type-break-terse-messages
1116                                     "Break complete (%s elapsed in total)"
1117                                   "Typing break has lasted %s")
1118                                 (type-break-format-time elapsed)))))
1119                (t
1120                 (setq tmsg
1121                       (format (if type-break-terse-messages
1122                                   "Break has lasted %s"
1123                                 "Typing break has lasted %s")
1124                               (type-break-format-time elapsed))))))
1125             (insert lines
1126                     (make-string (/ (- (window-width) (length tmsg)) 2) ?\ )
1127                     tmsg)
1128             (if (> (length rmsg) 0)
1129                 (insert "\n"
1130                         (make-string (/ (- (window-width) (length rmsg)) 2)
1131                                      ?\ )
1132                         rmsg))
1133             (if type-break-demo-boring-stats
1134                 (let*
1135                     ((message
1136                       (format
1137                        (if type-break-terse-messages
1138                            "Since last break: %s keystrokes\n"
1139                          "Since your last break you've typed %s keystrokes\n")
1140                        type-break-keystroke-count))
1141                      (column-spaces
1142                       (make-string (/ (- (window-width) (length message)) 2)
1143                                    ?\ ))
1144                      (wpm (/ (/ (float type-break-keystroke-count) 5)
1145                              (/ (type-break-time-difference
1146                                  type-break-interval-start
1147                                  type-break-time-last-break)
1148                                 60.0))))
1149                   (insert "\n\n" column-spaces message)
1150                   (if type-break-terse-messages
1151                       (insert (format "                  %s%.2f wpm"
1152                                       column-spaces
1153                                       wpm))
1154                     (setq message
1155                           (format "at an average of %.2f words per minute"
1156                                   wpm))
1157                     (insert
1158                      (make-string (/ (- (window-width) (length message)) 2)
1159                                   ?\ )
1160                      message))))
1161             (goto-char (point-min))
1162             (sit-for 60))
1163           (read-event)
1164           (type-break-catch-up-event)
1165           (kill-buffer buffer-name))
1166       (quit
1167        (and (get-buffer buffer-name)
1168             (kill-buffer buffer-name))))))
1169
1170 \f
1171 (provide 'type-break)
1172
1173 (if type-break-mode
1174     (type-break-mode 1))
1175
1176 ;;; type-break.el ends here