|
0
|
1 ;;; Interval timers for XEmacs
|
|
|
2 ;;; Copyright (C) 1988, 1991, 1993 Kyle E. Jones
|
|
|
3 ;;; Modified 5 Feb 91 by Jamie Zawinski <jwz@lucid.com> for Lucid Emacs
|
|
|
4 ;;; And again, 15 Dec 93.
|
|
|
5 ;;;
|
|
|
6 ;; This file is part of XEmacs.
|
|
|
7
|
|
|
8 ;; XEmacs is free software; you can redistribute it and/or modify it
|
|
|
9 ;; under the terms of the GNU General Public License as published by
|
|
|
10 ;; the Free Software Foundation; either version 2, or (at your option)
|
|
|
11 ;; any later version.
|
|
|
12
|
|
|
13 ;; XEmacs is distributed in the hope that it will be useful, but
|
|
|
14 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
16 ;; General Public License for more details.
|
|
|
17
|
|
|
18 ;; You should have received a copy of the GNU General Public License
|
|
|
19 ;; along with XEmacs; see the file COPYING. If not, write to the Free
|
|
|
20 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
21
|
|
|
22 ;;; Synched up with: Not in FSF.
|
|
|
23
|
|
|
24 ;;;
|
|
|
25 ;;; Send bug reports to kyle@uunet.uu.net.
|
|
|
26
|
|
|
27 ;; The original v18 version of this file worked by having an external program
|
|
|
28 ;; wake up once a second to generate an interrupt for emacs; then an emacs
|
|
|
29 ;; process filter was used to schedule timers.
|
|
|
30 ;;
|
|
|
31 ;; This version works by associating with each timer a "timeout" object,
|
|
|
32 ;; since the XEmacs/Lucid Emacs event loop has the concept of timers built
|
|
|
33 ;; in to it. There is no single scheduler function; instead, each timer
|
|
|
34 ;; re-sets itself as it is invoked.
|
|
|
35
|
|
|
36 ;; `itimer' feature means Emacs-Lisp programers get:
|
|
|
37 ;; itimerp, itimer-value, itimer-restart, itimer-function,
|
|
|
38 ;; set-itimer-value, set-itimer-restart, set-itimer-function
|
|
|
39 ;; get-itimer, start-itimer, read-itimer, delete-itimer
|
|
|
40 ;;
|
|
|
41 ;; Interactive users get these commands:
|
|
|
42 ;; edit-itimers, list-itimers, start-itimer
|
|
|
43 ;;
|
|
|
44 ;; See the doc strings of these functions for more information.
|
|
|
45
|
|
|
46 (defvar itimer-version "1.00"
|
|
|
47 "Version number of the itimer package.")
|
|
|
48
|
|
|
49 (defvar itimer-list nil
|
|
|
50 "List of all active itimers.")
|
|
|
51
|
|
|
52 ;; not needed in XEmacs
|
|
|
53 ;(defvar itimer-process nil
|
|
|
54 ; "Process that drives all itimers.")
|
|
|
55
|
|
|
56 ;; This value is maintained internally; it does not determine itimer
|
|
|
57 ;; granularity. Itimer granularity is 1 second, plus delays due to
|
|
|
58 ;; system and Emacs internal activity that delay dealing with process
|
|
|
59 ;; output.
|
|
|
60 ;; not needed in XEmacs
|
|
|
61 ;(defvar itimer-process-next-wakeup 1
|
|
|
62 ; "Itimer process will wakeup to service running itimers within this
|
|
|
63 ;many seconds.")
|
|
|
64
|
|
|
65 (defvar itimer-edit-map nil
|
|
|
66 "Keymap used when in Itimer Edit mode.")
|
|
|
67
|
|
|
68 (if itimer-edit-map
|
|
|
69 ()
|
|
|
70 (setq itimer-edit-map (make-sparse-keymap))
|
|
|
71 (define-key itimer-edit-map "s" 'itimer-edit-set-field)
|
|
|
72 (define-key itimer-edit-map "d" 'itimer-edit-delete-itimer)
|
|
|
73 (define-key itimer-edit-map "q" 'itimer-edit-quit)
|
|
|
74 (define-key itimer-edit-map "\t" 'itimer-edit-next-field)
|
|
|
75 (define-key itimer-edit-map " " 'next-line)
|
|
|
76 (define-key itimer-edit-map "n" 'next-line)
|
|
|
77 (define-key itimer-edit-map "p" 'previous-line)
|
|
|
78 (define-key itimer-edit-map "\C-?" 'itimer-edit-previous-field)
|
|
|
79 (define-key itimer-edit-map "x" 'start-itimer)
|
|
|
80 (define-key itimer-edit-map "?" 'itimer-edit-help))
|
|
|
81
|
|
|
82 (defvar itimer-edit-start-marker nil)
|
|
|
83
|
|
|
84 ;; macros must come first... or byte-compile'd code will throw back its
|
|
|
85 ;; head and scream.
|
|
|
86
|
|
|
87 (defmacro itimer-decf (variable)
|
|
|
88 (list 'setq variable (list '1- variable)))
|
|
|
89
|
|
|
90 (defmacro itimer-incf (variable)
|
|
|
91 (list 'setq variable (list '1+ variable)))
|
|
|
92
|
|
|
93 (defmacro itimer-signum (n)
|
|
|
94 (list 'if (list '> n 0) 1
|
|
|
95 (list 'if (list 'zerop n) 0 -1)))
|
|
|
96
|
|
|
97 ;; Itimer access functions should behave as if they were subrs. These
|
|
|
98 ;; macros are used to check the arguments to the itimer functions and
|
|
|
99 ;; signal errors appropriately if the arguments are not valid.
|
|
|
100
|
|
|
101 (defmacro check-itimer (var)
|
|
|
102 "If VAR is not bound to an itimer, signal wrong-type-argument.
|
|
|
103 This is a macro."
|
|
|
104 (list 'setq var
|
|
|
105 (list 'if (list 'itimerp var) var
|
|
|
106 (list 'signal ''wrong-type-argument
|
|
|
107 (list 'list ''itimerp var)))))
|
|
|
108
|
|
|
109 (defmacro check-itimer-coerce-string (var)
|
|
|
110 "If VAR is not bound to a string, look up the itimer that it names and
|
|
|
111 bind VAR to it. Otherwise if VAR is not bound to an itimer, signal
|
|
|
112 wrong-type-argument. This is a macro."
|
|
|
113 (list 'setq var
|
|
|
114 (list 'cond
|
|
|
115 (list (list 'itimerp var) var)
|
|
|
116 (list (list 'stringp var) (list 'get-itimer var))
|
|
|
117 (list t (list 'signal ''wrong-type-argument
|
|
|
118 (list 'list ''string-or-itimer-p var))))))
|
|
|
119
|
|
|
120 (defmacro itimer-check-natnum (var)
|
|
|
121 "If VAR is not bound to a non-negative number, signal wrong-type-argument.
|
|
|
122 This is a macro."
|
|
|
123 (list 'setq var
|
|
|
124 (list 'if (list 'natnump var) var
|
|
|
125 (list 'signal ''wrong-type-argument
|
|
|
126 (list 'list ''natnump var)))))
|
|
|
127
|
|
|
128 (defmacro itimer-check-string (var)
|
|
|
129 "If VAR is not bound to a string, signal wrong-type-argument.
|
|
|
130 This is a macro."
|
|
|
131 (list 'setq var
|
|
|
132 (list 'if (list 'stringp var) var
|
|
|
133 (list 'signal ''wrong-type-argument
|
|
|
134 (list 'list ''stringp var)))))
|
|
|
135
|
|
|
136 ;; Functions to access and modify itimer attributes.
|
|
|
137
|
|
|
138 (defun itimerp (obj)
|
|
|
139 "Returns non-nil iff OBJ is an itimer."
|
|
|
140 (and (consp obj) (stringp (car obj)) (eq (length obj)
|
|
|
141 5 ; for XEmacs
|
|
|
142 ;4 ; original version
|
|
|
143 )))
|
|
|
144
|
|
|
145 (defun itimer-name (itimer)
|
|
|
146 "Returns the name of ITIMER."
|
|
|
147 (check-itimer itimer)
|
|
|
148 (car itimer))
|
|
|
149
|
|
|
150 (defun itimer-value (itimer)
|
|
|
151 "Returns the number of seconds until ITIMER expires."
|
|
|
152 (check-itimer itimer)
|
|
|
153 (nth 1 itimer))
|
|
|
154
|
|
|
155 (defun itimer-restart (itimer)
|
|
|
156 "Returns the value to which ITIMER will be set at restart.
|
|
|
157 nil is returned if this itimer doesn't restart."
|
|
|
158 (check-itimer itimer)
|
|
|
159 (nth 2 itimer))
|
|
|
160
|
|
|
161 (defun itimer-function (itimer)
|
|
|
162 "Returns the function of ITIMER.
|
|
|
163 This function is called each time ITIMER expires."
|
|
|
164 (check-itimer itimer)
|
|
|
165 (nth 3 itimer))
|
|
|
166
|
|
|
167 ;; XEmacs-specific
|
|
|
168 (defun itimer-id (itimer)
|
|
|
169 "Returns the timeout-id of ITIMER."
|
|
|
170 (check-itimer itimer)
|
|
|
171 (nth 4 itimer))
|
|
|
172
|
|
|
173 (defun set-itimer-value (itimer value
|
|
|
174 ;; XEmacs doesn't need this
|
|
|
175 ;; &optional nowakeup
|
|
|
176 )
|
|
|
177 "Set the timeout value of ITIMER to be VALUE.
|
|
|
178 Itimer will expire is this many seconds.
|
|
|
179 Returns VALUE."
|
|
|
180 ;; Optional third arg NOWAKEUP non-nil means do not wakeup the itimer
|
|
|
181 ;; process to recompute a correct wakeup time, even if it means this
|
|
|
182 ;; itimer will expire late. itimer-process-filter uses this option.
|
|
|
183 ;; This is not meant for ordinary usage, which is why it is not
|
|
|
184 ;; mentioned in the doc string.
|
|
|
185 (check-itimer itimer)
|
|
|
186 (itimer-check-natnum value)
|
|
|
187 (let ((inhibit-quit t))
|
|
|
188
|
|
|
189 ; ;; If we're allowed to wakeup the itimer process,
|
|
|
190 ; ;; and the itimer process's next wakeup needs to be recomputed,
|
|
|
191 ; ;; and the itimer is running, then we wakeup the itimer process.
|
|
|
192 ; (or (and (not nowakeup) (< value itimer-process-next-wakeup)
|
|
|
193 ; (get-itimer (itimer-name itimer))
|
|
|
194 ; (progn (itimer-process-wakeup)
|
|
|
195 ; (setcar (cdr itimer) value)
|
|
|
196 ; (itimer-process-wakeup)))
|
|
|
197 ; (setcar (cdr itimer) value))
|
|
|
198
|
|
|
199 ;; the XEmacs way:
|
|
|
200 (if (itimer-id itimer)
|
|
|
201 (deactivate-itimer itimer))
|
|
|
202 (setcar (cdr itimer) value)
|
|
|
203 (activate-itimer itimer)
|
|
|
204
|
|
|
205 value))
|
|
|
206
|
|
|
207 (defun set-itimer-restart (itimer restart)
|
|
|
208 "Set the restart value of ITIMER to be RESTART.
|
|
|
209 If RESTART is nil, ITIMER will not restart when it expires.
|
|
|
210 Returns RESTART."
|
|
|
211 (check-itimer itimer)
|
|
|
212 (if restart (itimer-check-natnum restart))
|
|
|
213 (and restart (< restart 1) (signal 'args-out-of-range (list restart)))
|
|
|
214 ;; (setcar (cdr (cdr itimer)) restart)
|
|
|
215 ;; the XEmacs way
|
|
|
216 (let ((was-active (itimer-id itimer))
|
|
|
217 (inhibit-quit t))
|
|
|
218 (if was-active
|
|
|
219 (deactivate-itimer itimer))
|
|
|
220 (setcar (cdr (cdr itimer)) restart)
|
|
|
221 (if was-active
|
|
|
222 (progn
|
|
|
223 (setcar (cdr itimer) restart)
|
|
|
224 (if restart
|
|
|
225 (activate-itimer itimer)))))
|
|
|
226 restart)
|
|
|
227
|
|
|
228 (defun set-itimer-function (itimer function)
|
|
|
229 "Set the function of ITIMER to be FUNCTION.
|
|
|
230 FUNCTION will be called when itimer expires.
|
|
|
231 Returns FUNCTION."
|
|
|
232 (check-itimer itimer)
|
|
|
233 (setcar (cdr (cdr (cdr itimer))) function))
|
|
|
234
|
|
|
235 ;; XEmacs-specific
|
|
|
236 (defun set-itimer-id (itimer id)
|
|
|
237 (check-itimer itimer)
|
|
|
238 (setcar (cdr (cdr (cdr (cdr itimer)))) id))
|
|
|
239
|
|
|
240 (defun get-itimer (name)
|
|
|
241 "Return itimer named NAME, or nil if there is none."
|
|
|
242 (itimer-check-string name)
|
|
|
243 (assoc name itimer-list))
|
|
|
244
|
|
|
245 (defun read-itimer (prompt &optional initial-input)
|
|
|
246 "Read the name of an itimer from the minibuffer and return the itimer
|
|
|
247 associated with that name. The user is prompted with PROMPT.
|
|
|
248 Optional second arg INITIAL-INPUT non-nil is inserted into the
|
|
|
249 minibuffer as initial user input."
|
|
|
250 (get-itimer (completing-read prompt itimer-list nil 'confirm initial-input)))
|
|
|
251
|
|
|
252 (defun delete-itimer (itimer)
|
|
|
253 "Deletes ITIMER. ITIMER may be an itimer or the name of one."
|
|
|
254 (check-itimer-coerce-string itimer)
|
|
|
255 (deactivate-itimer itimer) ;; for XEmacs
|
|
|
256 (setq itimer-list (delq itimer itimer-list)))
|
|
|
257
|
|
|
258 ;jwz: this is preloaded so don't ;;;###autoload
|
|
|
259 (defun start-itimer (name function value &optional restart)
|
|
|
260 "Start an itimer.
|
|
|
261 Args are NAME, FUNCTION, VALUE &optional RESTART.
|
|
|
262 NAME is an identifier for the itimer. It must be a string. If an itimer
|
|
|
263 already exists with this name, NAME will be modified slightly to until
|
|
|
264 it is unique.
|
|
|
265 FUNCTION should be a function (or symbol naming one) of no arguments. It
|
|
|
266 will be called each time the itimer expires. The function can access
|
|
|
267 itimer that invoked it through the variable `current-itimer'.
|
|
|
268 VALUE is the number of seconds until this itimer expires.
|
|
|
269 Optional fourth arg RESTART non-nil means that this itimer should be
|
|
|
270 restarted automatically after its function is called. Normally an itimer
|
|
|
271 is deleted at expiration after its function has returned.
|
|
|
272 If non-nil RESTART should be a number indicating the value at which the
|
|
|
273 itimer should be set at restart time.
|
|
|
274 Returns the newly created itimer."
|
|
|
275 (interactive
|
|
|
276 (list (completing-read "Start itimer: " itimer-list)
|
|
|
277 (read (completing-read "Itimer function: " obarray 'fboundp))
|
|
|
278 (let (value)
|
|
|
279 (while (not (natnump value))
|
|
|
280 (setq value (read-from-minibuffer "Itimer value: " nil nil t)))
|
|
|
281 value)
|
|
|
282 (let ((restart t))
|
|
|
283 (while (and restart (not (natnump restart)))
|
|
|
284 (setq restart (read-from-minibuffer "Itimer restart: " nil nil t)))
|
|
|
285 restart)))
|
|
|
286 (itimer-check-string name)
|
|
|
287 (itimer-check-natnum value)
|
|
|
288 (if restart (itimer-check-natnum restart))
|
|
|
289 ;; Make proposed itimer name unique if it's not already.
|
|
|
290 (let ((oname name)
|
|
|
291 (num 2))
|
|
|
292 (while (get-itimer name)
|
|
|
293 (setq name (concat oname "<" num ">"))
|
|
|
294 (itimer-incf num)))
|
|
|
295 ; ;; If there's no itimer process, start one now.
|
|
|
296 ; ;; Otherwise wake up the itimer process so that seconds slept before
|
|
|
297 ; ;; the new itimer is created won't be counted against it.
|
|
|
298 ; (if itimer-process
|
|
|
299 ; (itimer-process-wakeup)
|
|
|
300 ; (itimer-process-start))
|
|
|
301 (let ((inhibit-quit t))
|
|
|
302 ;; add the itimer to the global list
|
|
|
303 (setq itimer-list
|
|
|
304 (cons (list name value restart function nil) ; extra slot for XEmacs
|
|
|
305 itimer-list))
|
|
|
306 ; ;; If the itimer process is scheduled to wake up too late for the itimer
|
|
|
307 ; ;; we wake it up to calculate a correct wakeup value giving consideration
|
|
|
308 ; ;; to the newly added itimer.
|
|
|
309 ; (if (< value itimer-process-next-wakeup)
|
|
|
310 ; (itimer-process-wakeup)))
|
|
|
311 ;; for XEmacs
|
|
|
312 (activate-itimer (car itimer-list))
|
|
|
313 )
|
|
|
314 (car itimer-list))
|
|
|
315
|
|
|
316 ;; User level functions to list and modify existing itimers.
|
|
|
317 ;; Itimer Edit major mode, and the editing commands thereof.
|
|
|
318
|
|
|
319 (defun list-itimers ()
|
|
|
320 "Pop up a buffer containing a list of all itimers.
|
|
|
321 The major mode of the buffer is Itimer Edit mode. This major mode provides
|
|
|
322 commands to manipulate itimers; see the documentation for
|
|
|
323 `itimer-edit-mode' for more information."
|
|
|
324 (interactive)
|
|
|
325 (let* ((buf (get-buffer-create "*Itimer List*"))
|
|
|
326 (opoint (point))
|
|
|
327 (standard-output buf)
|
|
|
328 (itimers (reverse itimer-list)))
|
|
|
329 (set-buffer buf)
|
|
|
330 (itimer-edit-mode)
|
|
|
331 (setq buffer-read-only nil)
|
|
|
332 (erase-buffer)
|
|
|
333 (insert "Name Value Restart Function\n"
|
|
|
334 "---- ----- ------- --------")
|
|
|
335 (if (null itimer-edit-start-marker)
|
|
|
336 (setq itimer-edit-start-marker (point)))
|
|
|
337 (while itimers
|
|
|
338 (newline 1)
|
|
|
339 (prin1 (itimer-name (car itimers)))
|
|
|
340 (tab-to-tab-stop)
|
|
|
341 (prin1 (itimer-value (car itimers)))
|
|
|
342 (tab-to-tab-stop)
|
|
|
343 (prin1 (itimer-restart (car itimers)))
|
|
|
344 (tab-to-tab-stop)
|
|
|
345 (prin1 (itimer-function (car itimers)))
|
|
|
346 (setq itimers (cdr itimers)))
|
|
|
347 ;; restore point
|
|
|
348 (goto-char opoint)
|
|
|
349 (if (< (point) itimer-edit-start-marker)
|
|
|
350 (goto-char itimer-edit-start-marker))
|
|
|
351 (setq buffer-read-only t)
|
|
|
352 (display-buffer buf)))
|
|
|
353
|
|
|
354 (defun edit-itimers ()
|
|
|
355 "Display a list of all itimers and select it for editing.
|
|
|
356 The major mode of the buffer containing the listing is Itimer Edit mode.
|
|
|
357 This major mode provides commands to manipulate itimers; see the documentation
|
|
|
358 for `itimer-edit-mode' for more information."
|
|
|
359 (interactive)
|
|
|
360 ;; since user is editing, make sure displayed data is reasonably up-to-date
|
|
|
361 ; (if itimer-process
|
|
|
362 ; (itimer-process-wakeup))
|
|
|
363 (list-itimers)
|
|
|
364 (select-window (get-buffer-window "*Itimer List*"))
|
|
|
365 (goto-char itimer-edit-start-marker)
|
|
|
366 (if itimer-list
|
|
|
367 (progn
|
|
|
368 (forward-sexp 2)
|
|
|
369 (backward-sexp)))
|
|
|
370 (message "type q to quit, ? for help"))
|
|
|
371
|
|
|
372 ;; no point in making this interactive.
|
|
|
373 (defun itimer-edit-mode ()
|
|
|
374 "Major mode for manipulating itimers.
|
|
|
375 Atrributes of running itimers are changed by moving the cursor to the
|
|
|
376 desired field and typing `s' to set that field. The field will then be
|
|
|
377 set to the value read from the minibuffer.
|
|
|
378
|
|
|
379 Commands:
|
|
|
380 TAB move forward a field
|
|
|
381 DEL move backward a field
|
|
|
382 s set a field
|
|
|
383 d delete the selected itimer
|
|
|
384 x start a new itimer
|
|
|
385 ? help"
|
|
|
386 (kill-all-local-variables)
|
|
|
387 (make-local-variable 'tab-stop-list)
|
|
|
388 (setq major-mode 'itimer-edit-mode
|
|
|
389 mode-name "Itimer Edit"
|
|
|
390 truncate-lines t
|
|
|
391 tab-stop-list '(22 32 42))
|
|
|
392 (abbrev-mode 0)
|
|
|
393 (auto-fill-mode 0)
|
|
|
394 (buffer-disable-undo (current-buffer))
|
|
|
395 (use-local-map itimer-edit-map)
|
|
|
396 (and lisp-mode-syntax-table (set-syntax-table lisp-mode-syntax-table)))
|
|
|
397
|
|
|
398 (put 'itimer-edit-mode 'mode-class 'special)
|
|
|
399
|
|
|
400 (defun itimer-edit-help ()
|
|
|
401 "Help function for Itimer Edit."
|
|
|
402 (interactive)
|
|
|
403 (if (eq last-command 'itimer-edit-help)
|
|
|
404 (describe-mode)
|
|
|
405 (message "TAB, DEL select fields, (s)et field, (d)elete itimer (type ? for more help)")))
|
|
|
406
|
|
|
407 (defun itimer-edit-quit ()
|
|
|
408 "End Itimer Edit."
|
|
|
409 (interactive)
|
|
|
410 (bury-buffer (current-buffer))
|
|
|
411 (if (one-window-p t)
|
|
|
412 (switch-to-buffer (other-buffer (current-buffer)))
|
|
|
413 (delete-window)))
|
|
|
414
|
|
|
415 (defun itimer-edit-set-field ()
|
|
|
416 (interactive)
|
|
|
417 ;; First two lines in list buffer are headers.
|
|
|
418 ;; Cry out against the luser who attempts to change a field there.
|
|
|
419 (if (<= (point) itimer-edit-start-marker)
|
|
|
420 (error ""))
|
|
|
421 ;; field-value must be initialized to be something other than a
|
|
|
422 ;; number, symbol, or list.
|
|
|
423 (let (itimer field (field-value ""))
|
|
|
424 (setq itimer (save-excursion
|
|
|
425 ;; read the name of the itimer from the beginning of
|
|
|
426 ;; the current line.
|
|
|
427 (beginning-of-line)
|
|
|
428 (get-itimer (read (current-buffer))))
|
|
|
429 field (save-excursion
|
|
|
430 (itimer-edit-beginning-of-field)
|
|
|
431 (let ((opoint (point))
|
|
|
432 (n 0))
|
|
|
433 ;; count the number of sexprs until we reach the cursor
|
|
|
434 ;; and use this info to determine which field the user
|
|
|
435 ;; wants to modify.
|
|
|
436 (beginning-of-line)
|
|
|
437 (while (and (>= opoint (point)) (< n 4))
|
|
|
438 (forward-sexp 2)
|
|
|
439 (backward-sexp)
|
|
|
440 (itimer-incf n))
|
|
|
441 (cond ((eq n 1) (error "Cannot change itimer name."))
|
|
|
442 ((eq n 2) 'value)
|
|
|
443 ((eq n 3) 'restart)
|
|
|
444 ((eq n 4) 'function)))))
|
|
|
445 (cond ((eq field 'value)
|
|
|
446 ;; XEmacs: rewritten for I18N3 snarfing
|
|
|
447 (while (not (natnump field-value))
|
|
|
448 (setq field-value (read-from-minibuffer "Set itimer value: "
|
|
|
449 nil nil t))))
|
|
|
450 ((eq field 'restart)
|
|
|
451 (while (and field-value (not (natnump field-value)))
|
|
|
452 (setq field-value (read-from-minibuffer "Set itimer restart: "
|
|
|
453 nil nil t))))
|
|
|
454 ((eq field 'function)
|
|
|
455 (while (not (or (and (symbolp field-value) (fboundp field-value))
|
|
|
456 (and (consp field-value)
|
|
|
457 (memq (car field-value) '(lambda macro)))))
|
|
|
458 (setq field-value
|
|
|
459 (read (completing-read "Set itimer function: "
|
|
|
460 obarray 'fboundp nil))))))
|
|
|
461 ;; set the itimer field
|
|
|
462 (funcall (intern (concat "set-itimer-" (symbol-name field)))
|
|
|
463 itimer field-value)
|
|
|
464 ;; move to beginning of field to be changed
|
|
|
465 (itimer-edit-beginning-of-field)
|
|
|
466 ;; modify the list buffer to reflect the change.
|
|
|
467 (let (buffer-read-only kill-ring)
|
|
|
468 (kill-sexp 1)
|
|
|
469 (kill-region (point) (progn (skip-chars-forward " \t") (point)))
|
|
|
470 (prin1 field-value (current-buffer))
|
|
|
471 (if (not (eolp))
|
|
|
472 (tab-to-tab-stop))
|
|
|
473 (backward-sexp))))
|
|
|
474
|
|
|
475 (defun itimer-edit-delete-itimer ()
|
|
|
476 (interactive)
|
|
|
477 ;; First two lines in list buffer are headers.
|
|
|
478 ;; Cry out against the luser who attempts to change a field there.
|
|
|
479 (if (<= (point) itimer-edit-start-marker)
|
|
|
480 (error ""))
|
|
|
481 (delete-itimer
|
|
|
482 (read-itimer "Delete itimer: "
|
|
|
483 (save-excursion (beginning-of-line) (read (current-buffer)))))
|
|
|
484 ;; update list information
|
|
|
485 (list-itimers))
|
|
|
486
|
|
|
487 (defun itimer-edit-next-field (count)
|
|
|
488 (interactive "p")
|
|
|
489 (itimer-edit-beginning-of-field)
|
|
|
490 (cond ((> (itimer-signum count) 0)
|
|
|
491 (while (not (zerop count))
|
|
|
492 (forward-sexp)
|
|
|
493 ;; wrap from eob to itimer-edit-start-marker
|
|
|
494 (if (eobp)
|
|
|
495 (progn
|
|
|
496 (goto-char itimer-edit-start-marker)
|
|
|
497 (forward-sexp)))
|
|
|
498 (forward-sexp)
|
|
|
499 (backward-sexp)
|
|
|
500 ;; treat fields at beginning of line as if they weren't there.
|
|
|
501 (if (bolp)
|
|
|
502 (progn
|
|
|
503 (forward-sexp 2)
|
|
|
504 (backward-sexp)))
|
|
|
505 (itimer-decf count)))
|
|
|
506 ((< (itimer-signum count) 0)
|
|
|
507 (while (not (zerop count))
|
|
|
508 (backward-sexp)
|
|
|
509 ;; treat fields at beginning of line as if they weren't there.
|
|
|
510 (if (bolp)
|
|
|
511 (backward-sexp))
|
|
|
512 ;; wrap from itimer-edit-start-marker to field at eob.
|
|
|
513 (if (<= (point) itimer-edit-start-marker)
|
|
|
514 (progn
|
|
|
515 (goto-char (point-max))
|
|
|
516 (backward-sexp)))
|
|
|
517 (itimer-incf count)))))
|
|
|
518
|
|
|
519 (defun itimer-edit-previous-field (count)
|
|
|
520 (interactive "p")
|
|
|
521 (itimer-edit-next-field (- count)))
|
|
|
522
|
|
|
523 (defun itimer-edit-beginning-of-field ()
|
|
|
524 (let ((forw-back (save-excursion (forward-sexp) (backward-sexp) (point)))
|
|
|
525 (back (save-excursion (backward-sexp) (point))))
|
|
|
526 (cond ((eq forw-back back) (backward-sexp))
|
|
|
527 ((eq forw-back (point)) t)
|
|
|
528 (t (backward-sexp)))))
|
|
|
529
|
|
|
530
|
|
|
531 ;; internals of the itimer implementation.
|
|
|
532
|
|
|
533 (defun itimer-process-filter (process string)
|
|
|
534 (error "itimer-process-filter is not used in XEmacs")
|
|
|
535 ; ;; If the itimer process dies and generates output while doing
|
|
|
536 ; ;; so, we may be called before the process-sentinel. Sanity
|
|
|
537 ; ;; check the output just in case...
|
|
|
538 ; (if (not (string-match "^[0-9]" string))
|
|
|
539 ; (progn (message "itimer process gave odd output: %s" string)
|
|
|
540 ; ;; it may be still alive and waiting for input
|
|
|
541 ; (process-send-string itimer-process "3\n"))
|
|
|
542 ; ;; if there are no active itimers, return quickly.
|
|
|
543 ; (if itimer-list
|
|
|
544 ; (let ((time-elapsed (string-to-int string))
|
|
|
545 ; (itimers itimer-list)
|
|
|
546 ; (itimer)
|
|
|
547 ; ;; process filters can be hit by stray C-g's from the user,
|
|
|
548 ; ;; so we must protect this stuff appropriately.
|
|
|
549 ; ;; Quit's are allowed from within itimer functions, but we
|
|
|
550 ; ;; catch them.
|
|
|
551 ; (inhibit-quit t))
|
|
|
552 ; (setq itimer-process-next-wakeup 600)
|
|
|
553 ; (while itimers
|
|
|
554 ; (setq itimer (car itimers))
|
|
|
555 ; (set-itimer-value itimer (max 0 (- (itimer-value itimer) time-elapsed)) t)
|
|
|
556 ; (if (> (itimer-value itimer) 0)
|
|
|
557 ; (setq itimer-process-next-wakeup
|
|
|
558 ; (min itimer-process-next-wakeup (itimer-value itimer)))
|
|
|
559 ; ;; itimer has expired, we must call its function.
|
|
|
560 ; ;; protect our local vars from the itimer function.
|
|
|
561 ; ;; allow keyboard quit to occur, but catch and report it.
|
|
|
562 ; ;; provide the variable `current-itimer' in case the function
|
|
|
563 ; ;; is interested.
|
|
|
564 ; (condition-case condition-data
|
|
|
565 ; (let* ((current-itimer itimer)
|
|
|
566 ; itimer itimers time-elapsed
|
|
|
567 ; quit-flag inhibit-quit)
|
|
|
568 ; (funcall (itimer-function current-itimer)))
|
|
|
569 ; (error (message "itimer \"%s\" signaled: %s" (itimer-name itimer)
|
|
|
570 ; (prin1-to-string condition-data)))
|
|
|
571 ; (quit (message "itimer \"%s\" quit" (itimer-name itimer))))
|
|
|
572 ; ;; restart the itimer if we should, otherwise delete it.
|
|
|
573 ; (if (null (itimer-restart itimer))
|
|
|
574 ; (delete-itimer itimer)
|
|
|
575 ; (set-itimer-value itimer (itimer-restart itimer) t)
|
|
|
576 ; (setq itimer-process-next-wakeup
|
|
|
577 ; (min itimer-process-next-wakeup (itimer-value itimer)))))
|
|
|
578 ; (setq itimers (cdr itimers)))
|
|
|
579 ; ;; if user is editing itimers, update displayed info
|
|
|
580 ; (if (eq major-mode 'itimer-edit-mode)
|
|
|
581 ; (list-itimers)))
|
|
|
582 ; (setq itimer-process-next-wakeup 600))
|
|
|
583 ; ;; tell itimer-process when to wakeup again
|
|
|
584 ; (process-send-string itimer-process
|
|
|
585 ; (concat (int-to-string itimer-process-next-wakeup)
|
|
|
586 ; "\n")))
|
|
|
587 )
|
|
|
588
|
|
|
589 (defun itimer-process-sentinel (process message)
|
|
|
590 (error "itimer-process-sentinel is not used in XEmacs")
|
|
|
591 ; (let ((inhibit-quit t))
|
|
|
592 ; (if (eq (process-status process) 'stop)
|
|
|
593 ; (continue-process process)
|
|
|
594 ; ;; not stopped, so it must have died.
|
|
|
595 ; ;; cleanup first...
|
|
|
596 ; (delete-process process)
|
|
|
597 ; (setq itimer-process nil)
|
|
|
598 ; ;; now, if there are any active itimers then we need to immediately
|
|
|
599 ; ;; start another itimer process, otherwise we can wait until the next
|
|
|
600 ; ;; start-itimer call, which will start one automatically.
|
|
|
601 ; (if (null itimer-list)
|
|
|
602 ; ()
|
|
|
603 ; ;; there may have been an error message in the echo area;
|
|
|
604 ; ;; give the user at least a little time to read it.
|
|
|
605 ; (sit-for 2)
|
|
|
606 ; (message "itimer process %s... respawning." (substring message 0 -1))
|
|
|
607 ; (itimer-process-start))))
|
|
|
608 )
|
|
|
609
|
|
|
610 (defun itimer-process-start ()
|
|
|
611 (error "itimer-process-start is not used in XEmacs")
|
|
|
612 ; (let ((inhibit-quit t)
|
|
|
613 ; (process-connection-type nil))
|
|
|
614 ; (setq itimer-process (start-process "itimer" nil "itimer"))
|
|
|
615 ; (process-kill-without-query itimer-process)
|
|
|
616 ; (set-process-filter itimer-process 'itimer-process-filter)
|
|
|
617 ; (set-process-sentinel itimer-process 'itimer-process-sentinel)
|
|
|
618 ; ;; Tell itimer process to wake up quickly, so that a correct wakeup
|
|
|
619 ; ;; time can be computed. Zero instead of one here loses because of
|
|
|
620 ; ;; underlying itimer implementations that use 0 to mean `disable the
|
|
|
621 ; ;; itimer'.
|
|
|
622 ; (setq itimer-process-next-wakeup 1)
|
|
|
623 ; (process-send-string itimer-process "1\n"))
|
|
|
624 )
|
|
|
625
|
|
|
626 (defun itimer-process-wakeup ()
|
|
|
627 (error "itimer-process-wakeup is not used in XEmacs")
|
|
|
628 ; (interrupt-process itimer-process)
|
|
|
629 ; (accept-process-output)
|
|
|
630 )
|
|
|
631
|
|
|
632
|
|
|
633 ;; XEmacs-specific code
|
|
|
634
|
|
|
635 (defun activate-itimer (itimer)
|
|
|
636 (let ((inhibit-quit t))
|
|
|
637 (set-itimer-id itimer
|
|
|
638 (add-timeout (itimer-value itimer)
|
|
|
639 'itimer-callback
|
|
|
640 itimer
|
|
|
641 (itimer-restart itimer))))
|
|
|
642 itimer)
|
|
|
643
|
|
|
644 (defun deactivate-itimer (itimer)
|
|
|
645 (let ((inhibit-quit t)
|
|
|
646 (id (itimer-id itimer)))
|
|
|
647 (and id (disable-timeout id))
|
|
|
648 (set-itimer-id itimer nil))
|
|
|
649 itimer)
|
|
|
650
|
|
|
651 (defun itimer-callback (current-itimer)
|
|
|
652 (funcall (itimer-function current-itimer)))
|
|
|
653
|
|
|
654
|
|
|
655 ;;; itimer-driven auto-saves
|
|
|
656
|
|
|
657 ;jwz: this is preloaded so don't ;;;###autoload
|
|
|
658 (defvar auto-save-timeout 30
|
|
|
659 "*Number of seconds idle time before auto-save.
|
|
|
660 Zero or nil means disable auto-saving due to idleness.
|
|
|
661
|
|
|
662 The actual amount of idle time between auto-saves is logarithmically related
|
|
|
663 to the size of the current buffer. This variable is the number of seconds
|
|
|
664 after which an auto-save will happen when the current buffer is 50k or less;
|
|
|
665 the timeout will be 2 1/4 times this in a 200k buffer, 3 3/4 times this in a
|
|
|
666 1000k buffer, and 4 1/2 times this in a 2000k buffer.
|
|
|
667
|
|
|
668 See also the variable `auto-save-interval', which controls auto-saving based
|
|
|
669 on the number of characters typed.")
|
|
|
670
|
|
|
671 ;jwz: this is preloaded so don't ;;;###autoload
|
|
|
672 (defvar auto-gc-threshold (/ gc-cons-threshold 3)
|
|
|
673 "*GC when this many bytes have been consed since the last GC,
|
|
|
674 and the user has been idle for `auto-save-timeout' seconds.")
|
|
|
675
|
|
|
676 (defun auto-save-itimer ()
|
|
|
677 "For use as a itimer callback function.
|
|
|
678 Auto-saves and garbage-collects based on the size of the current buffer
|
|
|
679 and the value of `auto-save-timeout', `auto-gc-threshold', and the current
|
|
|
680 keyboard idle-time."
|
|
|
681 (if (or (null auto-save-timeout)
|
|
|
682 (<= auto-save-timeout 0)
|
|
|
683 (eq (minibuffer-window) (selected-window)))
|
|
|
684 nil
|
|
|
685 (let ((buf-size (1+ (ash (buffer-size) -8)))
|
|
|
686 (delay-level 0)
|
|
|
687 (now (current-time))
|
|
|
688 delay)
|
|
|
689 (while (> buf-size 64)
|
|
|
690 (setq delay-level (1+ delay-level)
|
|
|
691 buf-size (- buf-size (ash buf-size -2))))
|
|
|
692 (if (< delay-level 4)
|
|
|
693 (setq delay-level 4))
|
|
|
694 ;; delay_level is 4 for files under around 50k, 7 at 100k, 9 at 200k,
|
|
|
695 ;; 11 at 300k, and 12 at 500k, 15 at 1 meg, and 17 at 2 meg.
|
|
|
696 (setq delay (/ (* delay-level auto-save-timeout) 4))
|
|
|
697 (let ((idle-time (if (or (not (consp last-input-time))
|
|
|
698 (/= (car now) (car last-input-time)))
|
|
|
699 (1+ delay)
|
|
|
700 (- (car (cdr now)) (cdr last-input-time)))))
|
|
|
701 (and (> idle-time delay)
|
|
|
702 (do-auto-save))
|
|
|
703 (and (> idle-time auto-save-timeout)
|
|
|
704 (> (consing-since-gc) auto-gc-threshold)
|
|
|
705 (garbage-collect)))))
|
|
|
706 ;; Look at the itimer that's currently running; if the user has changed
|
|
|
707 ;; the value of auto-save-timeout, modify this itimer to have the correct
|
|
|
708 ;; restart time. There will be some latency between when the user changes
|
|
|
709 ;; this variable and when it takes effect, but it will happen eventually.
|
|
|
710 (let ((self (get-itimer "auto-save")))
|
|
|
711 (or self (error "auto-save-itimer can't find itself"))
|
|
|
712 (if (and auto-save-timeout (> auto-save-timeout 4))
|
|
|
713 (or (= (itimer-restart self) (/ auto-save-timeout 4))
|
|
|
714 (set-itimer-restart self (/ auto-save-timeout 4)))))
|
|
|
715 nil)
|
|
|
716
|
|
|
717 (defun itimer-init-auto-gc ()
|
|
|
718 (or noninteractive ; may be being run from after-init-hook in -batch mode.
|
|
|
719 (get-itimer "auto-save")
|
|
|
720 ;; the time here is just the first interval; if the user changes it
|
|
|
721 ;; later, it will adjust.
|
|
|
722 (let ((time (max 2 (/ (or auto-save-timeout 30) 4))))
|
|
|
723 (start-itimer "auto-save" 'auto-save-itimer time time))))
|
|
|
724
|
|
|
725 (cond (purify-flag
|
|
|
726 ;; This file is being preloaded into an emacs about to be dumped.
|
|
|
727 ;; So arrange for the auto-save itimer to be started once emacs
|
|
|
728 ;; is launched.
|
|
|
729 (add-hook 'after-init-hook 'itimer-init-auto-gc))
|
|
|
730 (t
|
|
|
731 ;; Otherwise, this file is being loaded into a normal, interactive
|
|
|
732 ;; emacs. Start the auto-save timer now.
|
|
|
733 (itimer-init-auto-gc)))
|
|
|
734
|
|
|
735
|
|
|
736 (provide 'itimer)
|
