code.delx.au - gnu-emacs/blob - lisp/type-break.el

   1 ;;; type-break.el --- encourage rests from typing at appropriate intervals
   2
   3 ;; Copyright (C) 1994, 1995, 1997, 2000, 2001, 2002, 2003,
   4 ;;   2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
   5
   6 ;; Author: Noah Friedman
   7 ;; Maintainer: Noah Friedman <friedman@splode.com>
   8 ;; Keywords: extensions, timers
   9 ;; Status: Works in GNU Emacs 19.25 or later, some versions of XEmacs
  10 ;; Created: 1994-07-13
  11
  12 ;; This file is part of GNU Emacs.
  13
  14 ;; GNU Emacs is free software: you can redistribute it and/or modify
  15 ;; it under the terms of the GNU General Public License as published by
  16 ;; the Free Software Foundation, either version 3 of the License, or
  17 ;; (at your option) any later version.
  18
  19 ;; GNU Emacs is distributed in the hope that it will be useful,
  20 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 ;; GNU General Public License for more details.
  23
  24 ;; You should have received a copy of the GNU General Public License
  25 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  26
  27 ;;; Commentary:
  28
  29 ;; The docstring for the function `type-break-mode' summarizes most of the
  30 ;; details of the interface.
  31
  32 ;; This package relies on the assumption that you live entirely in Emacs,
  33 ;; as the author does.  If that's not the case for you (e.g. you often
  34 ;; suspend Emacs or work in other windows) then this won't help very much;
  35 ;; it will depend on just how often you switch back to Emacs.  At the very
  36 ;; least, you will want to turn off the keystroke thresholds and rest
  37 ;; interval tracking.
  38
  39 ;; If you prefer not to be queried about taking breaks, but instead just
  40 ;; want to be reminded, do the following:
  41 ;;
  42 ;;   (setq type-break-query-mode nil)
  43 ;;
  44 ;; Or call the command `type-break-query-mode' with a negative prefix
  45 ;; argument.
  46
  47 ;; If you find echo area messages annoying and would prefer to see messages
  48 ;; in the mode line instead, do M-x type-break-mode-line-message-mode
  49 ;; or set the variable of the same name to `t'.
  50
  51 ;; This program can truly cons up a storm because of all the calls to
  52 ;; `current-time' (which always returns 3 fresh conses).  I'm dismayed by
  53 ;; this, but I think the health of my hands is far more important than a
  54 ;; few pages of virtual memory.
  55
  56 ;; This program has no hope of working in Emacs 18.
  57
  58 ;; This package was inspired by Roland McGrath's hanoi-break.el.
  59 ;; Several people contributed feedback and ideas, including
  60 ;;      Roland McGrath <roland@gnu.org>
  61 ;;      Kleanthes Koniaris <kgk@koniaris.com>
  62 ;;      Mark Ashton <mpashton@gnu.org>
  63 ;;      Matt Wilding <wilding@cli.com>
  64 ;;      Robert S. Boyer <boyer@cs.utexas.edu>
  65
  66 ;;; Code:
  67
  68 \f
  69 (defgroup type-break nil
  70   "Encourage the user to take a rest from typing at suitable intervals."
  71   :prefix "type-break"
  72   :group 'keyboard)
  73
  74 ;;;###autoload
  75 (defcustom type-break-mode nil
  76   "Toggle typing break mode.
  77 See the docstring for the `type-break-mode' command for more information.
  78 Setting this variable directly does not take effect;
  79 use either \\[customize] or the function `type-break-mode'."
  80   :set (lambda (symbol value)
  81          (type-break-mode (if value 1 -1)))
  82   :initialize 'custom-initialize-default
  83   :type 'boolean
  84   :group 'type-break
  85   :require 'type-break)
  86
  87 ;;;###autoload
  88 (defcustom type-break-interval (* 60 60)
  89   "Number of seconds between scheduled typing breaks."
  90   :type 'integer
  91   :group 'type-break)
  92
  93 ;;;###autoload
  94 (defcustom type-break-good-rest-interval (/ type-break-interval 6)
  95   "Number of seconds of idle time considered to be an adequate typing rest.
  96
  97 When this variable is non-nil, Emacs checks the idle time between
  98 keystrokes.  If this idle time is long enough to be considered a \"good\"
  99 rest from typing, then the next typing break is simply rescheduled for later.
 100
 101 If a break is interrupted before this much time elapses, the user will be
 102 asked whether or not really to interrupt the break."
 103   :type 'integer
 104   :group 'type-break)
 105
 106 ;;;###autoload
 107 (defcustom type-break-good-break-interval nil
 108   "Number of seconds considered to be an adequate explicit typing rest.
 109
 110 When this variable is non-nil, its value is considered to be a \"good\"
 111 length (in seconds) for a break initiated by the command `type-break',
 112 overriding `type-break-good-rest-interval'.  This provides querying of
 113 break interruptions when `type-break-good-rest-interval' is nil."
 114   :type 'integer
 115   :group 'type-break)
 116
 117 ;;;###autoload
 118 (defcustom type-break-keystroke-threshold
 119   ;; Assuming typing speed is 35wpm (on the average, do you really
 120   ;; type more than that in a minute?  I spend a lot of time reading mail
 121   ;; and simply studying code in buffers) and average word length is
 122   ;; about 5 letters, default upper threshold to the average number of
 123   ;; keystrokes one is likely to type in a break interval.  That way if the
 124   ;; user goes through a furious burst of typing activity, cause a typing
 125   ;; break to be required sooner than originally scheduled.
 126   ;; Conversely, the minimum threshold should be about a fifth of this.
 127   (let* ((wpm 35)
 128          (avg-word-length 5)
 129          (upper (* wpm avg-word-length (/ type-break-interval 60)))
 130          (lower (/ upper 5)))
 131     (cons lower upper))
 132   "Upper and lower bound on number of keystrokes for considering typing break.
 133 This structure is a pair of numbers (MIN . MAX).
 134
 135 The first number is the minimum number of keystrokes that must have been
 136 entered since the last typing break before considering another one, even if
 137 the scheduled time has elapsed; the break is simply rescheduled until later
 138 if the minimum threshold hasn't been reached.  If this first value is nil,
 139 then there is no minimum threshold; as soon as the scheduled time has
 140 elapsed, the user will always be queried.
 141
 142 The second number is the maximum number of keystrokes that can be entered
 143 before a typing break is requested immediately, pre-empting the originally
 144 scheduled break.  If this second value is nil, then no pre-emptive breaks
 145 will occur; only scheduled ones will.
 146
 147 Keys with bucky bits (shift, control, meta, etc) are counted as only one
 148 keystroke even though they really require multiple keys to generate them.
 149
 150 The command `type-break-guesstimate-keystroke-threshold' can be used to
 151 guess a reasonably good pair of values for this variable."
 152   :type 'sexp
 153   :group 'type-break)
 154
 155 (defcustom type-break-query-mode t
 156   "Non-nil means ask whether or not to prompt user for breaks.
 157 If so, call the function specified in the value of the variable
 158 `type-break-query-function' to do the asking."
 159   :type 'boolean
 160   :group 'type-break)
 161
 162 (defcustom type-break-query-function 'yes-or-no-p
 163   "Function to use for making query for a typing break.
 164 It should take a string as an argument, the prompt.
 165 Usually this should be set to `yes-or-no-p' or `y-or-n-p'.
 166
 167 To avoid being queried at all, set `type-break-query-mode' to nil."
 168   :type '(radio function
 169                 (function-item yes-or-no-p)
 170                 (function-item y-or-n-p))
 171   :group 'type-break)
 172
 173 (defcustom type-break-query-interval 60
 174   "Number of seconds between queries to take a break, if put off.
 175 The user will continue to be prompted at this interval until he or she
 176 finally submits to taking a typing break."
 177   :type 'integer
 178   :group 'type-break)
 179
 180 (defcustom type-break-time-warning-intervals '(300 120 60 30)
 181   "List of time intervals for warnings about upcoming typing break.
 182 At each of the intervals (specified in seconds) away from a scheduled
 183 typing break, print a warning in the echo area."
 184   :type '(repeat integer)
 185   :group 'type-break)
 186
 187 (defcustom type-break-keystroke-warning-intervals '(300 200 100 50)
 188   "List of keystroke measurements for warnings about upcoming typing break.
 189 At each of the intervals (specified in keystrokes) away from the upper
 190 keystroke threshold, print a warning in the echo area.
 191 If either this variable or the upper threshold is set, then no warnings
 192 will occur."
 193   :type '(repeat integer)
 194   :group 'type-break)
 195
 196 (defcustom type-break-warning-repeat 40
 197   "Number of keystrokes for which warnings should be repeated.
 198 That is, for each of this many keystrokes the warning is redisplayed
 199 in the echo area to make sure it's really seen."
 200   :type 'integer
 201   :group 'type-break)
 202
 203 (defcustom type-break-time-stamp-format "[%H:%M] "
 204   "Timestamp format used to prefix messages.
 205 Format specifiers are as used by `format-time-string'."
 206   :type 'string
 207   :group 'type-break)
 208
 209 (defcustom type-break-demo-functions
 210   '(type-break-demo-boring type-break-demo-life type-break-demo-hanoi)
 211   "List of functions to consider running as demos during typing breaks.
 212 When a typing break begins, one of these functions is selected randomly
 213 to have Emacs do something interesting.
 214
 215 Any function in this list should start a demo which ceases as soon as a
 216 key is pressed."
 217   :type '(repeat function)
 218   :group 'type-break)
 219
 220 (defcustom type-break-demo-boring-stats nil
 221   "Show word per minute and keystroke figures in the Boring demo."
 222   :type 'boolean
 223   :group 'type-break)
 224
 225 (defcustom type-break-terse-messages nil
 226   "Use slightly terser messages."
 227   :type 'boolean
 228   :group 'type-break)
 229
 230 (defcustom type-break-file-name (convert-standard-filename "~/.type-break")
 231   "Name of file used to save state across sessions.
 232 If this is nil, no data will be saved across sessions."
 233   :type 'file
 234   :group 'type-break)
 235
 236 (defvar type-break-post-command-hook '(type-break-check)
 237   "Hook run indirectly by `post-command-hook' for typing break functions.
 238 This is not really intended to be set by the user, but it's probably
 239 harmless to do so.  Mainly it is used by various parts of the typing break
 240 program to delay actions until after the user has completed some command.
 241 It exists because `post-command-hook' itself is inaccessible while its
 242 functions are being run, and some type-break--related functions want to
 243 remove themselves after running.")
 244
 245 \f
 246 ;; Mode line frobs
 247
 248 (defcustom type-break-mode-line-message-mode nil
 249   "Non-nil means put type-break related messages in the mode line.
 250 Otherwise, messages typically go in the echo area.
 251
 252 See also `type-break-mode-line-format' and its members."
 253   :type 'boolean
 254   :group 'type-break)
 255
 256 (defvar type-break-mode-line-format
 257   '(type-break-mode-line-message-mode
 258     (""
 259      type-break-mode-line-break-message
 260      type-break-mode-line-warning))
 261   "*Format of messages in the mode line concerning typing breaks.")
 262
 263 (defvar type-break-mode-line-break-message
 264   '(type-break-mode-line-break-message-p
 265     type-break-mode-line-break-string))
 266
 267 (defvar type-break-mode-line-break-message-p nil)
 268 (defvar type-break-mode-line-break-string " *** TAKE A TYPING BREAK NOW ***")
 269
 270 (defvar type-break-mode-line-warning
 271       '(type-break-mode-line-break-message-p
 272         ("")
 273         (type-break-warning-countdown-string
 274          (" *** "
 275           "Break in "
 276           type-break-warning-countdown-string
 277           " "
 278           type-break-warning-countdown-string-type
 279           "***"))))
 280
 281 (defvar type-break-warning-countdown-string nil
 282   "If non-nil, this is a countdown for the next typing break.
 283
 284 This variable, in conjunction with `type-break-warning-countdown-string-type'
 285 \(which indicates whether this value is a number of keystrokes or seconds)
 286 is installed in `mode-line-format' to notify of imminent typing breaks.")
 287
 288 (defvar type-break-warning-countdown-string-type nil
 289   "Indicates the unit type of `type-break-warning-countdown-string'.
 290 It will be either \"seconds\" or \"keystrokes\".")
 291
 292 \f
 293 ;; These are internal variables.  Do not set them yourself.
 294
 295 (defvar type-break-alarm-p nil)
 296 (defvar type-break-keystroke-count 0)
 297 (defvar type-break-time-last-break nil)
 298 (defvar type-break-time-next-break nil)
 299 (defvar type-break-time-last-command (current-time))
 300 (defvar type-break-current-time-warning-interval nil)
 301 (defvar type-break-current-keystroke-warning-interval nil)
 302 (defvar type-break-time-warning-count 0)
 303 (defvar type-break-keystroke-warning-count 0)
 304 (defvar type-break-interval-start nil)
 305
 306 \f
 307 ;;;###autoload
 308 (defun type-break-mode (&optional prefix)
 309   "Enable or disable typing-break mode.
 310 This is a minor mode, but it is global to all buffers by default.
 311
 312 When this mode is enabled, the user is encouraged to take typing breaks at
 313 appropriate intervals; either after a specified amount of time or when the
 314 user has exceeded a keystroke threshold.  When the time arrives, the user
 315 is asked to take a break.  If the user refuses at that time, Emacs will ask
 316 again in a short period of time.  The idea is to give the user enough time
 317 to find a good breaking point in his or her work, but be sufficiently
 318 annoying to discourage putting typing breaks off indefinitely.
 319
 320 A negative prefix argument disables this mode.
 321 No argument or any non-negative argument enables it.
 322
 323 The user may enable or disable this mode by setting the variable of the
 324 same name, though setting it in that way doesn't reschedule a break or
 325 reset the keystroke counter.
 326
 327 If the mode was previously disabled and is enabled as a consequence of
 328 calling this function, it schedules a break with `type-break-schedule' to
 329 make sure one occurs (the user can call that command to reschedule the
 330 break at any time).  It also initializes the keystroke counter.
 331
 332 The variable `type-break-interval' specifies the number of seconds to
 333 schedule between regular typing breaks.  This variable doesn't directly
 334 affect the time schedule; it simply provides a default for the
 335 `type-break-schedule' command.
 336
 337 If set, the variable `type-break-good-rest-interval' specifies the minimum
 338 amount of time which is considered a reasonable typing break.  Whenever
 339 that time has elapsed, typing breaks are automatically rescheduled for
 340 later even if Emacs didn't prompt you to take one first.  Also, if a break
 341 is ended before this much time has elapsed, the user will be asked whether
 342 or not to continue.  A nil value for this variable prevents automatic
 343 break rescheduling, making `type-break-interval' an upper bound on the time
 344 between breaks.  In this case breaks will be prompted for as usual before
 345 the upper bound if the keystroke threshold is reached.
 346
 347 If `type-break-good-rest-interval' is nil and
 348 `type-break-good-break-interval' is set, then confirmation is required to
 349 interrupt a break before `type-break-good-break-interval' seconds
 350 have passed.  This provides for an upper bound on the time between breaks
 351 together with confirmation of interruptions to these breaks.
 352
 353 The variable `type-break-keystroke-threshold' is used to determine the
 354 thresholds at which typing breaks should be considered.  You can use
 355 the command `type-break-guesstimate-keystroke-threshold' to try to
 356 approximate good values for this.
 357
 358 There are several variables that affect how or when warning messages about
 359 imminent typing breaks are displayed.  They include:
 360
 361         `type-break-mode-line-message-mode'
 362         `type-break-time-warning-intervals'
 363         `type-break-keystroke-warning-intervals'
 364         `type-break-warning-repeat'
 365         `type-break-warning-countdown-string'
 366         `type-break-warning-countdown-string-type'
 367
 368 There are several variables that affect if, how, and when queries to begin
 369 a typing break occur.  They include:
 370
 371         `type-break-query-mode'
 372         `type-break-query-function'
 373         `type-break-query-interval'
 374
 375 The command `type-break-statistics' prints interesting things.
 376
 377 Finally, a file (named `type-break-file-name') is used to store information
 378 across Emacs sessions.  This provides recovery of the break status between
 379 sessions and after a crash.  Manual changes to the file may result in
 380 problems."
 381   (interactive "P")
 382   (type-break-check-post-command-hook)
 383
 384   (let ((already-enabled type-break-mode))
 385     (setq type-break-mode (>= (prefix-numeric-value prefix) 0))
 386
 387     (cond
 388      ((and already-enabled type-break-mode)
 389       (and (called-interactively-p 'interactive)
 390            (message "Type Break mode is already enabled")))
 391      (type-break-mode
 392       (when type-break-file-name
 393         (with-current-buffer (find-file-noselect type-break-file-name 'nowarn)
 394           (setq buffer-save-without-query t)))
 395
 396       (or global-mode-string
 397           (setq global-mode-string '("")))
 398       (or (assq 'type-break-mode-line-message-mode
 399                 minor-mode-alist)
 400           (setq minor-mode-alist
 401                 (cons type-break-mode-line-format
 402                       minor-mode-alist)))
 403       (type-break-keystroke-reset)
 404       (type-break-mode-line-countdown-or-break nil)
 405
 406       (setq type-break-time-last-break
 407             (or (type-break-get-previous-time)
 408                 (current-time)))
 409
 410       ;; schedule according to break time from session file
 411       (type-break-schedule
 412        (let (diff)
 413          (if (and type-break-time-last-break
 414                   (< (setq diff (type-break-time-difference
 415                                  type-break-time-last-break
 416                                  (current-time)))
 417                      type-break-interval))
 418              ;; use the file's value
 419              (progn
 420                (setq type-break-keystroke-count
 421                      (type-break-get-previous-count))
 422                ;; file the time, in case it was read from the auto-save file
 423                (type-break-file-time type-break-interval-start)
 424                (setq type-break-interval-start type-break-time-last-break)
 425                (- type-break-interval diff))
 426            ;; schedule from now
 427            (setq type-break-interval-start (current-time))
 428            (type-break-file-time type-break-interval-start)
 429            type-break-interval))
 430        type-break-interval-start
 431        type-break-interval)
 432
 433       (and (called-interactively-p 'interactive)
 434            (message "Type Break mode is enabled and set")))
 435      (t
 436       (type-break-keystroke-reset)
 437       (type-break-mode-line-countdown-or-break nil)
 438       (type-break-cancel-schedule)
 439       (do-auto-save)
 440       (when type-break-file-name
 441         (with-current-buffer (find-file-noselect type-break-file-name
 442                                                  'nowarn)
 443           (set-buffer-modified-p nil)
 444           (unlock-buffer)
 445           (kill-this-buffer)))
 446       (and (called-interactively-p 'interactive)
 447            (message "Type Break mode is disabled")))))
 448   type-break-mode)
 449
 450 (defun type-break-mode-line-message-mode (&optional prefix)
 451   "Enable or disable warnings in the mode line about typing breaks.
 452
 453 A negative PREFIX argument disables this mode.
 454 No argument or any non-negative argument enables it.
 455
 456 The user may also enable or disable this mode simply by setting the
 457 variable of the same name.
 458
 459 Variables controlling the display of messages in the mode line include:
 460
 461         `mode-line-format'
 462         `global-mode-string'
 463         `type-break-mode-line-break-message'
 464         `type-break-mode-line-warning'"
 465   (interactive "P")
 466   (setq type-break-mode-line-message-mode
 467         (>= (prefix-numeric-value prefix) 0))
 468   (and (called-interactively-p 'interactive)
 469        (if type-break-mode-line-message-mode
 470            (message "type-break-mode-line-message-mode is enabled")
 471          (message "type-break-mode-line-message-mode is disabled")))
 472   type-break-mode-line-message-mode)
 473
 474 (defun type-break-query-mode (&optional prefix)
 475   "Enable or disable warnings in the mode line about typing breaks.
 476
 477 When enabled, the user is periodically queried about whether to take a
 478 typing break at that moment.  The function which does this query is
 479 specified by the variable `type-break-query-function'.
 480
 481 A negative PREFIX argument disables this mode.
 482 No argument or any non-negative argument enables it.
 483
 484 The user may also enable or disable this mode simply by setting the
 485 variable of the same name."
 486   (interactive "P")
 487   (setq type-break-query-mode
 488         (>= (prefix-numeric-value prefix) 0))
 489   (and (called-interactively-p 'interactive)
 490        (if type-break-query-mode
 491            (message "type-break-query-mode is enabled")
 492          (message "type-break-query-mode is disabled")))
 493   type-break-query-mode)
 494
 495 \f
 496 ;;; session file functions
 497
 498 (defvar type-break-auto-save-file-name
 499   (let ((buffer-file-name type-break-file-name))
 500     (make-auto-save-file-name))
 501   "Auto-save name of `type-break-file-name'.")
 502
 503 (defun type-break-file-time (&optional time)
 504   "File break time in `type-break-file-name', unless the file is locked."
 505   (if (and type-break-file-name
 506            (not (stringp (file-locked-p type-break-file-name))))
 507       (with-current-buffer (find-file-noselect type-break-file-name
 508                                                'nowarn)
 509         (let ((inhibit-read-only t))
 510           (erase-buffer)
 511           (insert (format "%s\n\n" (or time type-break-interval-start)))
 512           ;; file saving is left to auto-save
 513           ))))
 514
 515 (defun type-break-file-keystroke-count ()
 516   "File keystroke count in `type-break-file-name', unless the file is locked."
 517   (if (and type-break-file-name
 518            (not (stringp (file-locked-p type-break-file-name))))
 519       ;; Prevent deactivation of the mark in some other buffer.
 520       (let (deactivate-mark)
 521         (with-current-buffer (find-file-noselect type-break-file-name
 522                                                  'nowarn)
 523           (save-excursion
 524             (let ((inhibit-read-only t))
 525               (goto-char (point-min))
 526               (forward-line)
 527               (delete-region (point) (save-excursion (end-of-line) (point)))
 528               (insert (format "%s" type-break-keystroke-count))
 529               ;; file saving is left to auto-save
 530               ))))))
 531
 532 (defun timep (time)
 533   "If TIME is in the format returned by `current-time' then
 534 return TIME, else return nil."
 535   (and (listp time)
 536        (eq (length time) 3)
 537        (integerp (car time))
 538        (integerp (nth 1 time))
 539        (integerp (nth 2 time))
 540        time))
 541
 542 (defun type-break-choose-file ()
 543   "Return file to read from."
 544   (cond
 545    ((not type-break-file-name)
 546     nil)
 547    ((and (file-exists-p type-break-auto-save-file-name)
 548          (file-readable-p type-break-auto-save-file-name))
 549     type-break-auto-save-file-name)
 550    ((and (file-exists-p type-break-file-name)
 551          (file-readable-p type-break-file-name))
 552     type-break-file-name)
 553    (t nil)))
 554
 555 (defun type-break-get-previous-time ()
 556   "Get previous break time from `type-break-file-name'.
 557 Returns nil if the file is missing or if the time breaks with the
 558 `current-time' format."
 559   (let ((file (type-break-choose-file)))
 560     (if file
 561         (timep ;; returns expected format, else nil
 562          (with-current-buffer (find-file-noselect file 'nowarn)
 563            (condition-case nil
 564                (save-excursion
 565                  (goto-char (point-min))
 566                  (read (current-buffer)))
 567              (end-of-file
 568               (error "End of file in `%s'" file))))))))
 569
 570 (defun type-break-get-previous-count ()
 571   "Get previous keystroke count from `type-break-file-name'.
 572 Return 0 if the file is missing or if the form read is not an
 573 integer."
 574   (let ((file (type-break-choose-file)))
 575     (if (and file
 576              (integerp
 577               (setq file
 578                     (with-current-buffer
 579                         (find-file-noselect file 'nowarn)
 580                     (condition-case nil
 581                         (save-excursion
 582                           (goto-char (point-min))
 583                           (forward-line 1)
 584                           (read (current-buffer)))
 585                       (end-of-file
 586                        (error "End of file in `%s'" file)))))))
 587         file
 588       0)))
 589
 590 \f
 591 ;;;###autoload
 592 (defun type-break ()
 593   "Take a typing break.
 594
 595 During the break, a demo selected from the functions listed in
 596 `type-break-demo-functions' is run.
 597
 598 After the typing break is finished, the next break is scheduled
 599 as per the function `type-break-schedule'."
 600   (interactive)
 601   (do-auto-save)
 602   (type-break-cancel-schedule)
 603   ;; remove any query scheduled during interactive invocation
 604   (remove-hook 'type-break-post-command-hook 'type-break-do-query)
 605   (let ((continue t)
 606         (start-time (current-time)))
 607     (setq type-break-time-last-break start-time)
 608     (while continue
 609       (save-window-excursion
 610         ;; Eat the screen.
 611         (and (eq (selected-window) (minibuffer-window))
 612              (other-window 1))
 613         (delete-other-windows)
 614         (scroll-right (window-width))
 615         (unless type-break-terse-messages
 616           (message "Press any key to resume from typing break."))
 617
 618         (random t)
 619         (let* ((len (length type-break-demo-functions))
 620                (idx (random len))
 621                (fn (nth idx type-break-demo-functions)))
 622           (condition-case ()
 623               (funcall fn)
 624             (error nil))))
 625
 626       (let ((good-interval (or type-break-good-rest-interval
 627                                type-break-good-break-interval)))
 628         (cond
 629          (good-interval
 630           (let ((break-secs (type-break-time-difference
 631                              start-time (current-time))))
 632             (cond
 633              ((>= break-secs good-interval)
 634               (setq continue nil))
 635              ;; 60 seconds may be too much leeway if the break is only 3
 636              ;; minutes to begin with.  You can just say "no" to the query
 637              ;; below if you're in that much of a hurry.
 638              ;;((> 60 (abs (- break-secs good-interval)))
 639              ;; (setq continue nil))
 640              ((funcall
 641                type-break-query-function
 642                (format
 643                 (if type-break-terse-messages
 644                     "%s%s remaining.  Continue break? "
 645                   "%sYou really ought to rest %s more.  Continue break? ")
 646                 (type-break-time-stamp)
 647                 (type-break-format-time (- good-interval
 648                                            break-secs)))))
 649              (t
 650               (setq continue nil)))))
 651          (t (setq continue nil))))))
 652
 653   (type-break-keystroke-reset)
 654   (type-break-file-time)
 655   (type-break-mode-line-countdown-or-break nil)
 656   (type-break-schedule))
 657
 658 \f
 659 (defun type-break-schedule (&optional time start interval)
 660   "Schedule a typing break for TIME seconds from now.
 661 If time is not specified it defaults to `type-break-interval'.
 662 START and INTERVAL are used when recovering a break.
 663 START is the start of the break (defaults to now).
 664 INTERVAL is the full length of an interval (defaults to TIME)."
 665   (interactive (list (and current-prefix-arg
 666                           (prefix-numeric-value current-prefix-arg))))
 667   (or time (setq time type-break-interval))
 668   (type-break-check-post-command-hook)
 669   (type-break-cancel-schedule)
 670   (type-break-time-warning-schedule time 'reset)
 671   (type-break-run-at-time (max 1 time) nil 'type-break-alarm)
 672   (setq type-break-time-next-break
 673         (type-break-time-sum (or start (current-time))
 674                              (or interval time))))
 675
 676 (defun type-break-cancel-schedule ()
 677   (type-break-cancel-time-warning-schedule)
 678   (type-break-cancel-function-timers 'type-break-alarm)
 679   (setq type-break-alarm-p nil)
 680   (setq type-break-time-next-break nil))
 681
 682 (defun type-break-time-warning-schedule (&optional time resetp)
 683   (let ((type-break-current-time-warning-interval nil))
 684     (type-break-cancel-time-warning-schedule))
 685   (add-hook 'type-break-post-command-hook 'type-break-time-warning 'append)
 686   (cond
 687    (type-break-time-warning-intervals
 688     (and resetp
 689          (setq type-break-current-time-warning-interval
 690                type-break-time-warning-intervals))
 691
 692     (or time
 693         (setq time (type-break-time-difference (current-time)
 694                                                type-break-time-next-break)))
 695
 696     (while (and type-break-current-time-warning-interval
 697                 (> (car type-break-current-time-warning-interval) time))
 698       (setq type-break-current-time-warning-interval
 699             (cdr type-break-current-time-warning-interval)))
 700
 701     (cond
 702      (type-break-current-time-warning-interval
 703       (setq time (- time (car type-break-current-time-warning-interval)))
 704       (setq type-break-current-time-warning-interval
 705             (cdr type-break-current-time-warning-interval))
 706
 707       ;(let (type-break-current-time-warning-interval)
 708       ;  (type-break-cancel-time-warning-schedule))
 709       (type-break-run-at-time (max 1 time) nil 'type-break-time-warning-alarm)
 710
 711       (cond
 712        (resetp
 713         (setq type-break-warning-countdown-string nil))
 714        (t
 715         (setq type-break-warning-countdown-string (number-to-string time))
 716         (setq type-break-warning-countdown-string-type "seconds"))))))))
 717
 718 (defun type-break-cancel-time-warning-schedule ()
 719   (type-break-cancel-function-timers 'type-break-time-warning-alarm)
 720   (remove-hook 'type-break-post-command-hook 'type-break-time-warning)
 721   (setq type-break-current-time-warning-interval
 722         type-break-time-warning-intervals)
 723   (setq type-break-time-warning-count 0) ; avoid warnings after break
 724   (setq type-break-warning-countdown-string nil))
 725
 726 (defun type-break-alarm ()
 727   (type-break-check-post-command-hook)
 728   (setq type-break-alarm-p t)
 729   (type-break-mode-line-countdown-or-break 'break))
 730
 731 (defun type-break-time-warning-alarm ()
 732   (type-break-check-post-command-hook)
 733   (type-break-time-warning-schedule)
 734   (setq type-break-time-warning-count type-break-warning-repeat)
 735   (type-break-time-warning)
 736   (type-break-mode-line-countdown-or-break 'countdown))
 737
 738 \f
 739 (defun type-break-run-tb-post-command-hook ()
 740   (and type-break-mode
 741        (run-hooks 'type-break-post-command-hook)))
 742
 743 (defun type-break-check ()
 744   "Ask to take a typing break if appropriate.
 745 This may be the case either because the scheduled time has come \(and the
 746 minimum keystroke threshold has been reached\) or because the maximum
 747 keystroke threshold has been exceeded."
 748   (type-break-file-keystroke-count)
 749   (let* ((min-threshold (car type-break-keystroke-threshold))
 750          (max-threshold (cdr type-break-keystroke-threshold)))
 751     (and type-break-good-rest-interval
 752          (progn
 753            (and (> (type-break-time-difference
 754                     type-break-time-last-command (current-time))
 755                    type-break-good-rest-interval)
 756                 (progn
 757                   (type-break-keystroke-reset)
 758                   (type-break-mode-line-countdown-or-break nil)
 759                   (setq type-break-time-last-break (current-time))
 760                   (type-break-schedule)))
 761            (setq type-break-time-last-command (current-time))))
 762
 763     (and type-break-keystroke-threshold
 764          (let ((keys (this-command-keys)))
 765            (cond
 766             ;; Ignore mouse motion
 767             ((and (vectorp keys)
 768                   (consp (aref keys 0))
 769                   (memq (car (aref keys 0)) '(mouse-movement))))
 770             (t
 771              (setq type-break-keystroke-count
 772                    (+ type-break-keystroke-count (length keys)))))))
 773
 774     (cond
 775      (type-break-alarm-p
 776       (cond
 777        ((input-pending-p))
 778        ((eq (selected-window) (minibuffer-window)))
 779        ((and min-threshold
 780              (< type-break-keystroke-count min-threshold))
 781         (type-break-schedule))
 782        (t
 783         ;; If keystroke count is within min-threshold of
 784         ;; max-threshold, lower it to reduce the likelihood of an
 785         ;; immediate subsequent query.
 786         (and max-threshold
 787              min-threshold
 788              (< (- max-threshold type-break-keystroke-count) min-threshold)
 789              (progn
 790                (type-break-keystroke-reset)
 791                (setq type-break-keystroke-count min-threshold)))
 792         (type-break-query))))
 793      ((and type-break-keystroke-warning-intervals
 794            max-threshold
 795            (= type-break-keystroke-warning-count 0)
 796            (type-break-check-keystroke-warning)))
 797      ((and max-threshold
 798            (> type-break-keystroke-count max-threshold)
 799            (not (input-pending-p))
 800            (not (eq (selected-window) (minibuffer-window))))
 801       (type-break-keystroke-reset)
 802       (setq type-break-keystroke-count (or min-threshold 0))
 803       (type-break-query)))))
 804
 805 ;; This should return t if warnings were enabled, nil otherwise.
 806 (defun type-break-check-keystroke-warning ()
 807   ;; This is safe because the caller should have checked that the cdr was
 808   ;; non-nil already.
 809   (let ((left (- (cdr type-break-keystroke-threshold)
 810                  type-break-keystroke-count)))
 811     (cond
 812      ((null (car type-break-current-keystroke-warning-interval))
 813       nil)
 814      ((> left (car type-break-current-keystroke-warning-interval))
 815       nil)
 816      (t
 817       (while (and (car type-break-current-keystroke-warning-interval)
 818                   (< left (car type-break-current-keystroke-warning-interval)))
 819         (setq type-break-current-keystroke-warning-interval
 820               (cdr type-break-current-keystroke-warning-interval)))
 821       (setq type-break-keystroke-warning-count type-break-warning-repeat)
 822       (add-hook 'type-break-post-command-hook 'type-break-keystroke-warning)
 823       (setq type-break-warning-countdown-string (number-to-string left))
 824       (setq type-break-warning-countdown-string-type "keystrokes")
 825       (type-break-mode-line-countdown-or-break 'countdown)
 826       t))))
 827
 828 ;; Arrange for a break query to be made, when the user stops typing furiously.
 829 (defun type-break-query ()
 830   (add-hook 'type-break-post-command-hook 'type-break-do-query))
 831
 832 (defun type-break-do-query ()
 833   (cond
 834    ((not type-break-query-mode)
 835     (type-break-noninteractive-query)
 836     (type-break-schedule type-break-query-interval)
 837     (remove-hook 'type-break-post-command-hook 'type-break-do-query))
 838    ((sit-for 2)
 839     (condition-case ()
 840         (cond
 841          ((let ((type-break-mode nil)
 842                 ;; yes-or-no-p sets this-command to exit-minibuffer,
 843                 ;; which hoses undo or yank-pop (if you happened to be
 844                 ;; yanking just when the query occurred).
 845                 (this-command this-command))
 846             ;; Cancel schedule to prevent possibility of a second query
 847             ;; from taking place before this one has even returned.
 848             ;; The condition-case wrapper will reschedule on quit.
 849             (type-break-cancel-schedule)
 850             ;; Also prevent a second query when the break is interrupted.
 851             (remove-hook 'type-break-post-command-hook 'type-break-do-query)
 852             (funcall type-break-query-function
 853                      (format "%s%s"
 854                              (type-break-time-stamp)
 855                              (if type-break-terse-messages
 856                                  "Break now? "
 857                                "Take a break from typing now? "))))
 858           (type-break))
 859          (t
 860           (type-break-schedule type-break-query-interval)))
 861       (quit
 862        (type-break-schedule type-break-query-interval))))))
 863
 864 (defun type-break-noninteractive-query (&optional ignored-args)
 865   "Null query function which doesn't interrupt user and assumes `no'.
 866 It prints a reminder in the echo area to take a break, but doesn't enforce
 867 this or ask the user to start one right now."
 868   (cond
 869    (type-break-mode-line-message-mode)
 870    (t
 871     (beep t)
 872     (message "%sYou should take a typing break now.  Do `M-x type-break'."
 873              (type-break-time-stamp))
 874     (sit-for 1)
 875     (beep t)
 876     ;; return nil so query caller knows to reset reminder, as if user
 877     ;; said "no" in response to yes-or-no-p.
 878     nil)))
 879
 880 (defun type-break-time-warning ()
 881   (cond
 882    ((and (car type-break-keystroke-threshold)
 883          (< type-break-keystroke-count (car type-break-keystroke-threshold))))
 884    ((> type-break-time-warning-count 0)
 885     (let ((timeleft (type-break-time-difference (current-time)
 886                                                 type-break-time-next-break)))
 887       (setq type-break-warning-countdown-string (number-to-string timeleft))
 888       (cond
 889        ((eq (selected-window) (minibuffer-window)))
 890        ;; Do nothing if the command was just a prefix arg, since that will
 891        ;; immediately be followed by some other interactive command.
 892        ;; Otherwise, it is particularly annoying for the sit-for below to
 893        ;; delay redisplay when one types sequences like `C-u -1 C-l'.
 894        ((memq this-command '(digit-argument universal-argument)))
 895        ((not type-break-mode-line-message-mode)
 896         ;; Pause for a moment so any previous message can be seen.
 897         (sit-for 2)
 898         (message "%sWarning: typing break due in %s."
 899                  (type-break-time-stamp)
 900                  (type-break-format-time timeleft))
 901         (setq type-break-time-warning-count
 902               (1- type-break-time-warning-count))))))
 903    (t
 904     (remove-hook 'type-break-post-command-hook 'type-break-time-warning)
 905     (setq type-break-warning-countdown-string nil))))
 906
 907 (defun type-break-keystroke-warning ()
 908   (cond
 909    ((> type-break-keystroke-warning-count 0)
 910     (setq type-break-warning-countdown-string
 911           (number-to-string (- (cdr type-break-keystroke-threshold)
 912                                type-break-keystroke-count)))
 913     (cond
 914      ((eq (selected-window) (minibuffer-window)))
 915      ;; Do nothing if the command was just a prefix arg, since that will
 916      ;; immediately be followed by some other interactive command.
 917      ;; Otherwise, it is particularly annoying for the sit-for below to
 918      ;; delay redisplay when one types sequences like `C-u -1 C-l'.
 919      ((memq this-command '(digit-argument universal-argument)))
 920      ((not type-break-mode-line-message-mode)
 921       (sit-for 2)
 922       (message "%sWarning: typing break due in %s keystrokes."
 923                (type-break-time-stamp)
 924                (- (cdr type-break-keystroke-threshold)
 925                   type-break-keystroke-count))
 926       (setq type-break-keystroke-warning-count
 927             (1- type-break-keystroke-warning-count)))))
 928    (t
 929     (remove-hook 'type-break-post-command-hook
 930                  'type-break-keystroke-warning)
 931     (setq type-break-warning-countdown-string nil))))
 932
 933 (defun type-break-mode-line-countdown-or-break (&optional type)
 934   (cond
 935    ((not type-break-mode-line-message-mode))
 936    ((eq type 'countdown)
 937     ;(setq type-break-mode-line-break-message-p nil)
 938     (add-hook 'type-break-post-command-hook
 939               'type-break-force-mode-line-update 'append))
 940    ((eq type 'break)
 941     ;; Alternate
 942     (setq type-break-mode-line-break-message-p
 943           (not type-break-mode-line-break-message-p))
 944     (remove-hook 'type-break-post-command-hook
 945                  'type-break-force-mode-line-update))
 946    (t
 947     (setq type-break-mode-line-break-message-p nil)
 948     (setq type-break-warning-countdown-string nil)
 949     (remove-hook 'type-break-post-command-hook
 950                  'type-break-force-mode-line-update)))
 951   (type-break-force-mode-line-update))
 952
 953 \f
 954 ;;;###autoload
 955 (defun type-break-statistics ()
 956   "Print statistics about typing breaks in a temporary buffer.
 957 This includes the last time a typing break was taken, when the next one is
 958 scheduled, the keystroke thresholds and the current keystroke count, etc."
 959   (interactive)
 960   (with-output-to-temp-buffer "*Typing Break Statistics*"
 961     (princ (format "Typing break statistics\n-----------------------\n
 962 Typing break mode is currently %s.
 963 Interactive query for breaks is %s.
 964 Warnings of imminent typing breaks in mode line is %s.
 965
 966 Last typing break ended     : %s
 967 Next scheduled typing break : %s\n
 968 Minimum keystroke threshold : %s
 969 Maximum keystroke threshold : %s
 970 Current keystroke count     : %s"
 971                    (if type-break-mode "enabled" "disabled")
 972                    (if type-break-query-mode "enabled" "disabled")
 973                    (if type-break-mode-line-message-mode "enabled" "disabled")
 974                    (if type-break-time-last-break
 975                        (current-time-string type-break-time-last-break)
 976                      "never")
 977                    (if (and type-break-mode type-break-time-next-break)
 978                        (format "%s\t(%s from now)"
 979                                (current-time-string type-break-time-next-break)
 980                                (type-break-format-time
 981                                 (type-break-time-difference
 982                                 (current-time)
 983                                 type-break-time-next-break)))
 984                      "none scheduled")
 985                    (or (car type-break-keystroke-threshold) "none")
 986                    (or (cdr type-break-keystroke-threshold) "none")
 987                    type-break-keystroke-count))))
 988
 989 ;;;###autoload
 990 (defun type-break-guesstimate-keystroke-threshold (wpm &optional wordlen frac)
 991   "Guess values for the minimum/maximum keystroke threshold for typing breaks.
 992
 993 If called interactively, the user is prompted for their guess as to how
 994 many words per minute they usually type.  This value should not be your
 995 maximum WPM, but your average.  Of course, this is harder to gauge since it
 996 can vary considerably depending on what you are doing.  For example, one
 997 tends to type less when debugging a program as opposed to writing
 998 documentation.  (Perhaps a separate program should be written to estimate
 999 average typing speed.)
1000
1001 From that, this command sets the values in `type-break-keystroke-threshold'
1002 based on a fairly simple algorithm involving assumptions about the average
1003 length of words (5).  For the minimum threshold, it uses about a fifth of
1004 the computed maximum threshold.
1005
1006 When called from Lisp programs, the optional args WORDLEN and FRAC can be
1007 used to override the default assumption about average word length and the
1008 fraction of the maximum threshold to which to set the minimum threshold.
1009 FRAC should be the inverse of the fractional value; for example, a value of
1010 2 would mean to use one half, a value of 4 would mean to use one quarter, etc."
1011   (interactive "NOn average, how many words per minute do you type? ")
1012   (let* ((upper (* wpm (or wordlen 5) (/ type-break-interval 60)))
1013          (lower (/ upper (or frac 5))))
1014     (or type-break-keystroke-threshold
1015         (setq type-break-keystroke-threshold (cons nil nil)))
1016     (setcar type-break-keystroke-threshold lower)
1017     (setcdr type-break-keystroke-threshold upper)
1018     (if (called-interactively-p 'interactive)
1019         (message "min threshold: %d\tmax threshold: %d" lower upper))
1020     type-break-keystroke-threshold))
1021
1022 \f
1023 ;;; misc functions
1024
1025 ;; Compute the difference, in seconds, between a and b, two structures
1026 ;; similar to those returned by `current-time'.
1027 ;; Use addition rather than logand since that is more robust; the low 16
1028 ;; bits of the seconds might have been incremented, making it more than 16
1029 ;; bits wide.
1030 (defun type-break-time-difference (a b)
1031   (+ (lsh (- (car b) (car a)) 16)
1032      (- (car (cdr b)) (car (cdr a)))))
1033
1034 ;; Return (in a new list the same in structure to that returned by
1035 ;; `current-time') the sum of the arguments.  Each argument may be a time
1036 ;; list or a single integer, a number of seconds.
1037 ;; This function keeps the high and low 16 bits of the seconds properly
1038 ;; balanced so that the lower value never exceeds 16 bits.  Otherwise, when
1039 ;; the result is passed to `current-time-string' it will toss some of the
1040 ;; "low" bits and format the time incorrectly.
1041 (defun type-break-time-sum (&rest tmlist)
1042   (let ((high 0)
1043         (low 0)
1044         (micro 0)
1045         tem)
1046     (while tmlist
1047       (setq tem (car tmlist))
1048       (setq tmlist (cdr tmlist))
1049       (cond
1050        ((numberp tem)
1051         (setq low (+ low tem)))
1052        (t
1053         (setq high  (+ high  (or (car tem) 0)))
1054         (setq low   (+ low   (or (car (cdr tem)) 0)))
1055         (setq micro (+ micro (or (car (cdr (cdr tem))) 0))))))
1056
1057     (and (>= micro 1000000)
1058          (progn
1059            (setq tem (/ micro 1000000))
1060            (setq low (+ low tem))
1061            (setq micro (- micro (* tem 1000000)))))
1062
1063     (setq tem (lsh low -16))
1064     (and (> tem 0)
1065          (progn
1066            (setq low (logand low 65535))
1067            (setq high (+ high tem))))
1068
1069     (list high low micro)))
1070
1071 (defun type-break-time-stamp (&optional when)
1072   (if (fboundp 'format-time-string)
1073       (format-time-string type-break-time-stamp-format when)
1074     ;; Emacs 19.28 and prior do not have format-time-string.
1075     ;; In that case, result is not customizable.  Upgrade today!
1076     (format "[%s] " (substring (current-time-string when) 11 16))))
1077
1078 (defun type-break-format-time (secs)
1079   (let ((mins (/ secs 60)))
1080     (cond
1081      ((= mins 1) (format "%d minute" mins))
1082      ((> mins 0) (format "%d minutes" mins))
1083      ((= secs 1) (format "%d second" secs))
1084      (t (format "%d seconds" secs)))))
1085
1086 (defun type-break-keystroke-reset ()
1087   (setq type-break-interval-start (current-time)) ; not a keystroke
1088   (setq type-break-keystroke-count 0)
1089   (setq type-break-keystroke-warning-count 0)
1090   (setq type-break-current-keystroke-warning-interval
1091         type-break-keystroke-warning-intervals)
1092   (remove-hook 'type-break-post-command-hook 'type-break-keystroke-warning))
1093
1094 (defun type-break-force-mode-line-update (&optional all)
1095   "Force the mode-line of the current buffer to be redisplayed.
1096 With optional non-nil ALL, force redisplay of all mode-lines."
1097   (and all (with-current-buffer (other-buffer)))
1098   (set-buffer-modified-p (buffer-modified-p)))
1099
1100 ;; If an exception occurs in Emacs while running the post command hook, the
1101 ;; value of that hook is clobbered.  This is because the value of the
1102 ;; variable is temporarily set to nil while it's running to prevent
1103 ;; recursive application, but it also means an exception aborts the routine
1104 ;; of restoring it.  This function is called from the timers to restore it,
1105 ;; just in case.
1106 (defun type-break-check-post-command-hook ()
1107   (add-hook 'post-command-hook 'type-break-run-tb-post-command-hook 'append))
1108
1109 \f
1110 ;;; Timer wrapper functions
1111 ;;
1112 ;; These shield type-break from variations in the interval timer packages
1113 ;; for different versions of Emacs.
1114
1115 (defun type-break-run-at-time (time repeat function)
1116   (condition-case nil (or (require 'timer) (require 'itimer)) (error nil))
1117   (run-at-time time repeat function))
1118
1119 (defvar timer-dont-exit)
1120 (defun type-break-cancel-function-timers (function)
1121   (let ((timer-dont-exit t))
1122     (cancel-function-timers function)))
1123
1124 \f
1125 ;;; Demo wrappers
1126
1127 (defun type-break-catch-up-event ()
1128   ;; If the last input event is a down-event, read and discard the
1129   ;; corresponding up-event too, to avoid triggering another prompt.
1130   (and (eventp last-input-event)
1131        (memq 'down (event-modifiers last-input-event))
1132        (read-event)))
1133
1134 ;; This is a wrapper around hanoi that calls it with an arg large enough to
1135 ;; make the largest discs possible that will fit in the window.
1136 ;; Also, clean up the *Hanoi* buffer after we're done.
1137 (defun type-break-demo-hanoi ()
1138   "Take a hanoiing typing break."
1139   (and (get-buffer "*Hanoi*")
1140        (kill-buffer "*Hanoi*"))
1141   (condition-case ()
1142       (progn
1143         (hanoi (/ (window-width) 8))
1144         ;; Wait for user to come back.
1145         (read-event)
1146         (type-break-catch-up-event)
1147         (kill-buffer "*Hanoi*"))
1148     (quit
1149      (read-event)
1150      (type-break-catch-up-event)
1151      (and (get-buffer "*Hanoi*")
1152           (kill-buffer "*Hanoi*")))))
1153
1154 ;; This is a wrapper around life that calls it with a `sleep' arg to make
1155 ;; it run a little more leisurely.
1156 ;; Also, clean up the *Life* buffer after we're done.
1157 (defun type-break-demo-life ()
1158   "Take a typing break and get a life."
1159   (let ((continue t))
1160     (while continue
1161       (setq continue nil)
1162       (and (get-buffer "*Life*")
1163            (kill-buffer "*Life*"))
1164       (condition-case ()
1165           (progn
1166             (life 3)
1167             ;; wait for user to return
1168             (read-event)
1169             (type-break-catch-up-event)
1170             (kill-buffer "*Life*"))
1171         (life-extinct
1172          (message "%s" (get 'life-extinct 'error-message))
1173          ;; restart demo
1174          (setq continue t))
1175         (quit
1176          (type-break-catch-up-event)
1177          (and (get-buffer "*Life*")
1178               (kill-buffer "*Life*")))))))
1179
1180 ;; Boring demo, but doesn't use many cycles
1181 (defun type-break-demo-boring ()
1182   "Boring typing break demo."
1183   (let ((rmsg (if type-break-terse-messages
1184                   ""
1185                 "Press any key to resume from typing break"))
1186         (buffer-name "*Typing Break Buffer*")
1187         lines elapsed timeleft tmsg)
1188     (condition-case ()
1189         (progn
1190           (switch-to-buffer (get-buffer-create buffer-name))
1191           (buffer-disable-undo (current-buffer))
1192           (setq lines (/ (window-body-height) 2))
1193           (unless type-break-terse-messages (setq lines (1- lines)))
1194           (if type-break-demo-boring-stats
1195               (setq lines (- lines 2)))
1196           (setq lines (make-string lines ?\C-j))
1197           (while (not (input-pending-p))
1198             (erase-buffer)
1199             (setq elapsed (type-break-time-difference
1200                            type-break-time-last-break
1201                            (current-time)))
1202             (let ((good-interval (or type-break-good-rest-interval
1203                                      type-break-good-break-interval)))
1204               (cond
1205                (good-interval
1206                 (setq timeleft (- good-interval elapsed))
1207                 (if (> timeleft 0)
1208                     (setq tmsg
1209                           (format (if type-break-terse-messages
1210                                       "Break remaining: %s"
1211                                     "You should rest for %s more")
1212                                   (type-break-format-time timeleft)))
1213                   (setq tmsg
1214                         (format (if type-break-terse-messages
1215                                     "Break complete (%s elapsed in total)"
1216                                   "Typing break has lasted %s")
1217                                 (type-break-format-time elapsed)))))
1218                (t
1219                 (setq tmsg
1220                       (format (if type-break-terse-messages
1221                                   "Break has lasted %s"
1222                                 "Typing break has lasted %s")
1223                               (type-break-format-time elapsed))))))
1224             (insert lines
1225                     (make-string (/ (- (window-width) (length tmsg)) 2) ?\ )
1226                     tmsg)
1227             (if (> (length rmsg) 0)
1228                 (insert "\n"
1229                         (make-string (/ (- (window-width) (length rmsg)) 2)
1230                                      ?\ )
1231                         rmsg))
1232             (if type-break-demo-boring-stats
1233                 (let*
1234                     ((message
1235                       (format
1236                        (if type-break-terse-messages
1237                            "Since last break: %s keystrokes\n"
1238                          "Since your last break you've typed %s keystrokes\n")
1239                        type-break-keystroke-count))
1240                      (column-spaces
1241                       (make-string (/ (- (window-width) (length message)) 2)
1242                                    ?\ ))
1243                      (wpm (/ (/ (float type-break-keystroke-count) 5)
1244                              (/ (type-break-time-difference
1245                                  type-break-interval-start
1246                                  type-break-time-last-break)
1247                                 60.0))))
1248                   (insert "\n\n" column-spaces message)
1249                   (if type-break-terse-messages
1250                       (insert (format "                  %s%.2f wpm"
1251                                       column-spaces
1252                                       wpm))
1253                     (setq message
1254                           (format "at an average of %.2f words per minute"
1255                                   wpm))
1256                     (insert
1257                      (make-string (/ (- (window-width) (length message)) 2)
1258                                   ?\ )
1259                      message))))
1260             (goto-char (point-min))
1261             (sit-for 60))
1262           (read-event)
1263           (type-break-catch-up-event)
1264           (kill-buffer buffer-name))
1265       (quit
1266        (and (get-buffer buffer-name)
1267             (kill-buffer buffer-name))))))
1268
1269 \f
1270 (provide 'type-break)
1271
1272 (if type-break-mode
1273     (type-break-mode 1))
1274
1275 ;; arch-tag: 943a2eb3-07e6-420b-993f-96e4796f5fd0
1276 ;;; type-break.el ends here