Commit be8d412c authored by Noah Friedman's avatar Noah Friedman
Browse files

type-break-mode: Make variable `nil' by default.

type-break-mode (function): If setting to t and mode was already enabled,
don't reschedule breaks or reset keystroke counter.

type-break-good-rest-interval: New variable.
type-break-time-difference: New inline function (defsubst).
tyype-break-time-last-break, type-break-time-next-break,
type-break-time-last-command: New variables.

type-break-check: Reset timers and counters if user has been idle more than
type-break-good-rest-interval seconds (assuming it's set).
Never set keystroke counter to be less than the min threshold.

type-break: Admonish user if s/he rested less than
type-break-good-rest-interval seconds (assuming it's set).

type-break-demo-hanoi: Eat a char when quitting.

type-break-statistics, type-break-guestimate-keystroke-threshold: New
commands.
parent 4cf64c15
;;; type-break.el --- take breaks from typing at appropriate intervals
;;; type-break.el --- encourage rests from typing at appropriate intervals
;;; Copyright (C) 1994 Roland McGrath
;;; Copyright (C) 1994 Noah S. Friedman
;;; Author: Noah Friedman <friedman@prep.ai.mit.edu>
;;; Roland McGrath <roland@prep.ai.mit.edu>
;;; Maintainer: friedman@prep.ai.mit.edu
;;; Keywords: extensions, timers
;;; Status: works in GNU Emacs 19
;;; Status: known to work in GNU Emacs 19.25 or later.
;;; Created: 1994-07-13
;;; LCD Archive Entry:
;;; type-break|Noah Friedman|friedman@prep.ai.mit.edu|
;;; take breaks from typing at appropriate intervals|
;;; encourage rests from typing at appropriate intervals|
;;; $Date$|$Revision$||
;;; $Id$
......@@ -33,13 +31,32 @@
;;; Inc.; 675 Massachusetts Avenue; Cambridge, MA 02139, USA.
;;; Commentary:
;;; The docstring for the function `type-break-mode' summarizes most of the
;;; details of the interface.
;;; This package relies on the assumption that you live entirely in emacs,
;;; as the author does. If that's not the case for you (e.g. you often
;;; suspend emacs or work in other windows) then this won't help very much;
;;; it will depend on just how often you switch back to emacs. At the very
;;; least, you will want to turn off the keystroke thresholds and rest
;;; interval tracking.
;;; Setting type-break-good-rest-interval makes emacs cons like a maniac
;;; because of repeated calls to `current-time'. There's not really any
;;; good way to avoid this without disabling the variable.
;;; This package was inspired by Roland McGrath's hanoi-break.el.
;;; Code:
(require 'timer)
;; Make this nil initially so that the call to type-break-mode at the end
;; will cause scheduling and so forth to happen.
;;;###autoload
(defvar type-break-mode t
(defvar type-break-mode nil
"*Non-`nil' means typing break mode is enabled.
See the docstring for the `type-break-mode' command for more information.")
......@@ -47,6 +64,17 @@ See the docstring for the `type-break-mode' command for more information.")
(defvar type-break-interval (* 60 60)
"*Number of seconds between scheduled typing breaks.")
;;;###autoload
(defvar type-break-good-rest-interval (/ type-break-interval 6)
"*Number of seconds of idle time considered to be an adequate typing rest.
When this variable is non-`nil', emacs checks the idle time between
keystrokes. If this idle time is long enough to be considered a "good"
rest from typing, then the next typing break is simply rescheduled for later.
The user will also be admonished if a forced break isn't at least as long
as this time, to remind them to rest longer next time.")
;;;###autoload
(defvar type-break-query-interval 60
"*Number of seconds between queries to take a break, if put off.
......@@ -67,20 +95,23 @@ finally submits to taking a typing break.")
(lower (/ upper 4)))
(cons lower upper))
"*Upper and lower bound on number of keystrokes for considering typing break.
This structure is a pair of numbers.
This structure is a pair of numbers. The first number is the minimum
number of keystrokes that must have been entered since the last typing
break before considering another one, even if the scheduled time has
elapsed; the break is simply rescheduled until later if the minimum
threshold hasn't been reached.
The first number is the minimum number of keystrokes that must have been
entered since the last typing break before considering another one, even if
the scheduled time has elapsed; the break is simply rescheduled until later
if the minimum threshold hasn't been reached. If this first value is nil,
then there is no minimum threshold; as soon as the scheduled time has
elapsed, the user will always be queried.
The second number is the maximum number of keystrokes that can be entered
before a typing break is requested immediately, pre-empting the originally
scheduled break.
scheduled break. If this second value is nil, then no pre-emptive breaks
will occur; only scheduled ones will.
Keys with bucky bits (shift, control, meta, etc) are counted as only one
keystroke even though they really require multiple keys to generate them.")
;;;###autoload
(defvar type-break-query-function 'yes-or-no-p
"*Function to use for making query for a typing break.
......@@ -98,13 +129,25 @@ key is pressed.")
;; These are internal variables. Do not set them yourself.
;; Number of commands (roughly # of keystrokes) recorded since last break.
(defvar type-break-keystroke-count 0)
;; Non-nil when a scheduled typing break is due.
(defvar type-break-alarm-p nil)
(defvar type-break-keystroke-count 0)
(defvar type-break-time-last-break nil)
(defvar type-break-time-next-break nil)
(defvar type-break-time-last-command (current-time))
;; Compute the difference, in seconds, between a and b, two structures
;; similar to those returned by `current-time'.
;; Use addition rather than logand since I found it convenient to add
;; seconds to the cdr of some of my stored time values, which may throw off
;; the number of bits in the cdr.
(defsubst type-break-time-difference (a b)
(+ (lsh (- (car b) (car a)) 16)
(- (car (cdr b)) (car (cdr a)))))
;;;###autoload
(defun type-break-mode (&optional prefix)
"Enable or disable typing-break mode.
......@@ -126,10 +169,10 @@ The user may enable or disable this mode by setting the variable of the
same name, though setting it in that way doesn't reschedule a break or
reset the keystroke counter.
When this function enables the mode, it schedules a break with
`type-break-schedule' to make sure one occurs (the user can call that
command to reschedule the break at any time). It also initializes the
keystroke counter.
If the mode was previously disabled and is enabled as a consequence of
calling this function, it schedules a break with `type-break-schedule' to
make sure one occurs (the user can call that command to reschedule the
break at any time). It also initializes the keystroke counter.
The variable `type-break-interval' specifies the number of seconds to
schedule between regular typing breaks. This variable doesn't directly
......@@ -140,35 +183,47 @@ The variable `type-break-query-interval' specifies the number of seconds to
schedule between repeated queries for breaks when the user answers \"no\"
to the previous query.
The variable `type-break-keystroke-theshold' is used to determine the
thresholds at which typing breaks should be considered.
The variable `type-break-good-rest-interval' specifies the minimum amount
of time which is considered a reasonable typing break. Whenever that time
has elapsed, typing breaks are automatically rescheduled for later even if
emacs didn't prompt you to take one first. You can disable this behavior.
The variable `type-break-keystroke-threshold' is used to determine the
thresholds at which typing breaks should be considered. You can use
the command `type-break-guestimate-keystroke-threshold' to try to
approximate good values for this.
The variable `type-break-query-function' should contain a function (or the
symbolic name of a function) to be used to query the user for typing
breaks."
breaks.
Finally, the command `type-break-statistics' prints interesting things."
(interactive "P")
;; make sure it's there.
(add-hook 'post-command-hook 'type-break-check 'append)
(cond
((null prefix)
(setq type-break-mode (not type-break-mode)))
((numberp (prefix-numeric-value prefix))
(setq type-break-mode (>= (prefix-numeric-value prefix) 0)))
(prefix
(setq type-break-mode t))
(t
(setq type-break-mode nil)))
(cond
(type-break-mode
(setq type-break-keystroke-count 0)
(type-break-schedule)
(and (interactive-p)
(message "type-break-mode is enabled and reset")))
((interactive-p)
(message "type-break-mode is disabled")))
(let ((already-enabled type-break-mode))
(cond
((null prefix)
(setq type-break-mode (not type-break-mode)))
((numberp (prefix-numeric-value prefix))
(setq type-break-mode (>= (prefix-numeric-value prefix) 0)))
(prefix
(setq type-break-mode t))
(t
(setq type-break-mode nil)))
(cond
((and already-enabled type-break-mode)
(and (interactive-p)
(message "type-break-mode was already enabled")))
(type-break-mode
(setq type-break-keystroke-count 0)
(type-break-schedule)
(and (interactive-p)
(message "type-break-mode is enabled and reset")))
((interactive-p)
(message "type-break-mode is disabled"))))
type-break-mode)
;;;###autoload
......@@ -182,13 +237,14 @@ After the typing break is finished, the next break is scheduled
as per the function `type-break-schedule', and the keystroke counter is
reset."
(interactive)
(setq type-break-time-last-break (current-time))
(save-window-excursion
;; Eat the screen.
(and (eq (selected-window) (minibuffer-window))
(other-window 1))
(delete-other-windows)
(scroll-right (window-width))
(message "Press any key to finish typing break.")
(message "Press any key to resume from typing break.")
(random t)
(let* ((len (length type-break-demo-function-vector))
......@@ -196,10 +252,16 @@ reset."
(fn (aref type-break-demo-function-vector idx)))
(condition-case ()
(funcall fn)
(error nil)))
(error nil))))
(and type-break-good-rest-interval
(< (type-break-time-difference type-break-time-last-command
(current-time))
type-break-good-rest-interval)
(message "That typing break wasn't really long enough. Rest more next time."))
(setq type-break-keystroke-count 0)
(type-break-schedule)))
(setq type-break-keystroke-count 0)
(type-break-schedule))
;;;###autoload
......@@ -211,7 +273,11 @@ If time is not specified, default to `type-break-interval'."
(or time (setq time type-break-interval))
;; Remove any old scheduled break
(type-break-cancel-schedule)
(run-at-time time nil 'type-break-alarm))
(run-at-time time nil 'type-break-alarm)
(setq type-break-time-next-break (current-time))
(setcar (cdr type-break-time-next-break)
(+ time (car (cdr type-break-time-next-break)))))
(defun type-break-cancel-schedule ()
"Cancel scheduled typing breaks.
......@@ -221,7 +287,8 @@ type-break-mode."
(interactive)
(let ((timer-dont-exit t))
(cancel-function-timers 'type-break-alarm))
(setq type-break-alarm-p nil))
(setq type-break-alarm-p nil)
(setq type-break-time-next-break nil))
(defun type-break-alarm ()
"This function is run when a scheduled typing break is due."
......@@ -234,27 +301,56 @@ minimum keystroke threshold has been reached\) or because the maximum
keystroke threshold has been exceeded."
(cond
(type-break-mode
(let* ((pair (and (consp type-break-keystroke-threshold)
type-break-keystroke-threshold))
(min-threshold (car pair))
(max-threshold (cdr pair)))
(and pair
(stringp (this-command-keys))
(let* ((threshold-pair (and (consp type-break-keystroke-threshold)
type-break-keystroke-threshold))
(min-threshold (car threshold-pair))
(max-threshold (cdr threshold-pair)))
;; Reset schedule and keystroke count if user has been idle longer
;; than a normal resting period.
(cond
(type-break-good-rest-interval
(and (> (type-break-time-difference type-break-time-last-command
(current-time))
type-break-good-rest-interval)
(progn
(setq type-break-keystroke-count 0)
(type-break-schedule)))
(setq type-break-time-last-command (current-time))))
(and threshold-pair
(setq type-break-keystroke-count
(+ type-break-keystroke-count (length (this-command-keys)))))
(cond
((input-pending-p))
((and (numberp max-threshold)
(> type-break-keystroke-count max-threshold))
(setq type-break-keystroke-count 0)
(type-break-query))
(type-break-alarm-p
(cond
((and (numberp min-threshold)
((and min-threshold
(< type-break-keystroke-count min-threshold)))
(t
(setq type-break-keystroke-count 0)
(type-break-query)))))))))
;; If the keystroke count is within min-threshold characters of
;; the maximum threshold, set the count to min-threshold. That
;; way, if the count was really close the threshold and the user
;; doesn't choose to take a break now, s/he won't be pestered
;; almost immediately after saying "no"; that's what the query
;; interval delay is for.
;; On the other hand, don't set it too small (make it at least
;; min-threshold); that way we can be sure the user will be asked
;; again to take a break after the query interval has elapsed.
;; If the user chooses to take a break now, the break function
;; will reset the keystroke count anyway.
(and max-threshold
min-threshold
(> (- max-threshold type-break-keystroke-count) min-threshold)
(setq type-break-keystroke-count min-threshold))
(type-break-query))))
((and max-threshold
(> type-break-keystroke-count max-threshold))
;; Set it to the min threshold if possible, to be sure the user
;; will be pestered again in at least a minute.
(setq type-break-keystroke-count (or min-threshold 0))
(type-break-query)))))))
(defun type-break-query ()
(condition-case ()
......@@ -280,7 +376,9 @@ keystroke threshold has been exceeded."
;; Wait for user to come back.
(read-char)
(kill-buffer "*Hanoi*"))
(quit
(quit
;; eat char
(read-char)
(and (get-buffer "*Hanoi*")
(kill-buffer "*Hanoi*")))))
......@@ -297,10 +395,64 @@ keystroke threshold has been exceeded."
;; Wait for user to come back.
(read-char)
(kill-buffer "*Life*"))
(quit
(quit
(and (get-buffer "*Life*")
(kill-buffer "*Life*")))))
;;;###autoload
(defun type-break-statistics ()
"Print statistics about typing breaks in a temporary buffer.
This includes the last time a typing break was taken, when the next one is
scheduled, the keystroke thresholds and the current keystroke count, etc."
(interactive)
(with-output-to-temp-buffer "*Typing Break Statistics*"
(princ (format "Typing break statistics\n-----------------------\n
Last typing break : %s
Next scheduled typing break : %s\n
Minimum keystroke threshold : %s
Maximum keystroke threshold : %s
Current keystroke count : %s"
(if type-break-time-last-break
(current-time-string type-break-time-last-break)
"never")
(if (and type-break-mode type-break-time-next-break)
(format "%s\t(%d minutes from now)"
(current-time-string type-break-time-next-break)
(/ (type-break-time-difference
(current-time) type-break-time-next-break)
60))
"none scheduled")
(or (car type-break-keystroke-threshold) "none")
(or (cdr type-break-keystroke-threshold) "none")
type-break-keystroke-count))))
;;;###autoload
(defun type-break-guestimate-keystroke-threshold (wpm &optional wordlen frac)
"Guess values for the minimum/maximum keystroke threshold for typing breaks.
If called interactively, the user is prompted for their guess as to how
many words per minute they usually type. From that, the command sets the
values in `type-break-keystroke-threshold' based on a fairly simple
algorithm involving assumptions about the average length of words (5).
For the minimum threshold, it uses about a quarter of the computed maximum
threshold.
When called from lisp programs, the optional args WORDLEN and FRAC can be
used to override the default assumption about average word length and the
fraction of the maximum threshold to which to set the minimum threshold.
FRAC should be the inverse of the fractional value; for example, a value of
2 would mean to use one half, a value of 4 would mean to use one quarter, etc."
(interactive "nHow many words per minute do you type? ")
(let* ((upper (* wpm (or wordlen 5) (/ type-break-interval 60)))
(lower (/ upper (or frac 4))))
(or type-break-keystroke-threshold
(setq type-break-keystroke-threshold (cons nil nil)))
(setcar type-break-keystroke-threshold lower)
(setcdr type-break-keystroke-threshold upper)
(if (interactive-p)
(message "min threshold: %d\tmax threshold: %d" lower upper)
type-break-keystroke-threshold)))
(provide 'type-break)
......
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