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annotate lisp/itimer-autosave.el @ 5940:c608d4b0b75e cygwin64 tip
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| author | Henry Thompson <ht@markup.co.uk> |
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| date | Thu, 16 Dec 2021 18:48:58 +0000 |
| parents | 308d34e9f07d |
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| rev | line source |
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| 209 | 1 ;;; itimer-autosave.el --- Autosave functions with itimers |
| 2 | |
| 3 ;; Copyright status unknown | |
| 4 | |
| 5 ;; Maintainer: XEmacs Development Team | |
| 6 ;; Keywords: internal, dumped | |
| 7 | |
| 8 ;; This file is part of XEmacs. | |
| 9 | |
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10 ;; XEmacs is free software: you can redistribute it and/or modify it |
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11 ;; under the terms of the GNU General Public License as published by the |
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12 ;; Free Software Foundation, either version 3 of the License, or (at your |
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13 ;; option) any later version. |
| 209 | 14 |
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15 ;; XEmacs is distributed in the hope that it will be useful, but WITHOUT |
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16 ;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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17 ;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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18 ;; for more details. |
| 209 | 19 |
| 20 ;; You should have received a copy of the GNU General Public License | |
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21 ;; along with XEmacs. If not, see <http://www.gnu.org/licenses/>. |
| 209 | 22 |
| 23 ;;; Synched up with: Not in FSF. | |
| 24 | |
| 25 ;;; Commentary: | |
| 26 | |
| 27 ;; This file is dumped with XEmacs. | |
| 28 | |
| 29 ;; itimer-driven auto-saves | |
| 30 | |
| 31 ;;; Code: | |
| 32 | |
| 33 ;jwz: this is preloaded so don't ;;;###autoload | |
| 34 (defvar auto-save-timeout 960 | |
| 35 "*Number of seconds idle time before auto-save. | |
| 36 Zero or nil means disable auto-saving due to idleness. | |
| 37 | |
| 38 The actual amount of idle time between auto-saves is logarithmically related | |
| 39 to the size of the current buffer. This variable is the number of seconds | |
| 40 after which an auto-save will happen when the current buffer is 50k or less; | |
| 41 the timeout will be 2 1/4 times this in a 200k buffer, 3 3/4 times this in a | |
| 42 1000k buffer, and 4 1/2 times this in a 2000k buffer. | |
| 43 | |
| 44 See also the variable `auto-save-interval', which controls auto-saving based | |
| 45 on the number of characters typed.") | |
| 46 | |
| 47 ;jwz: this is preloaded so don't ;;;###autoload | |
| 48 (defvar auto-gc-threshold (/ gc-cons-threshold 3) | |
| 49 "*GC when this many bytes have been consed since the last GC, | |
| 50 and the user has been idle for `auto-save-timeout' seconds.") | |
| 51 | |
| 52 (defun auto-save-itimer () | |
| 53 "For use as a itimer callback function. | |
| 54 Auto-saves and garbage-collects based on the size of the current buffer | |
| 55 and the value of `auto-save-timeout', `auto-gc-threshold', and the current | |
| 56 keyboard idle-time." | |
| 57 (if (or (null auto-save-timeout) | |
| 58 (<= auto-save-timeout 0) | |
| 59 (eq (minibuffer-window) (selected-window))) | |
| 60 nil | |
| 61 (let ((buf-size (1+ (ash (buffer-size) -8))) | |
| 62 (delay-level 0) | |
| 63 (now (current-time)) | |
| 64 delay) | |
| 65 (while (> buf-size 64) | |
| 66 (setq delay-level (1+ delay-level) | |
| 67 buf-size (- buf-size (ash buf-size -2)))) | |
| 68 (if (< delay-level 4) | |
| 69 (setq delay-level 4)) | |
| 70 ;; delay_level is 4 for files under around 50k, 7 at 100k, 9 at 200k, | |
| 71 ;; 11 at 300k, and 12 at 500k, 15 at 1 meg, and 17 at 2 meg. | |
| 72 (setq delay (/ (* delay-level auto-save-timeout) 4)) | |
| 73 (let ((idle-time (if (or (not (consp last-input-time)) | |
| 74 (/= (car now) (car last-input-time))) | |
| 75 (1+ delay) | |
| 76 (- (car (cdr now)) (cdr last-input-time))))) | |
| 77 (and (> idle-time delay) | |
| 78 (do-auto-save)) | |
| 79 (and (> idle-time auto-save-timeout) | |
| 80 (> (consing-since-gc) auto-gc-threshold) | |
| 81 (garbage-collect))))) | |
| 82 ;; Look at the itimer that's currently running; if the user has changed | |
| 83 ;; the value of auto-save-timeout, modify this itimer to have the correct | |
| 84 ;; restart time. There will be some latency between when the user changes | |
| 85 ;; this variable and when it takes effect, but it will happen eventually. | |
| 86 (let ((self (get-itimer "auto-save"))) | |
| 87 (or self (error "auto-save-itimer can't find itself")) | |
| 88 (if (and auto-save-timeout (> auto-save-timeout 4)) | |
| 89 (or (= (itimer-restart self) (/ auto-save-timeout 4)) | |
| 90 (set-itimer-restart self (/ auto-save-timeout 4))))) | |
| 91 nil) | |
| 92 | |
| 93 (defun itimer-init-auto-gc () | |
| 94 (or noninteractive ; may be being run from after-init-hook in -batch mode. | |
| 95 (get-itimer "auto-save") | |
| 96 ;; the time here is just the first interval; if the user changes it | |
| 97 ;; later, it will adjust. | |
| 98 (let ((time (max 2 (/ (or auto-save-timeout 30) 4)))) | |
| 99 (start-itimer "auto-save" 'auto-save-itimer time time)))) | |
| 100 | |
| 101 (cond (purify-flag | |
| 102 ;; This file is being preloaded into an emacs about to be dumped. | |
| 103 ;; So arrange for the auto-save itimer to be started once emacs | |
| 104 ;; is launched. | |
| 105 (add-hook 'after-init-hook 'itimer-init-auto-gc)) | |
| 106 (t | |
| 107 ;; Otherwise, this file is being loaded into a normal, interactive | |
| 108 ;; emacs. Start the auto-save timer now. | |
| 109 (itimer-init-auto-gc))) | |
| 110 | |
| 111 | |
| 112 ;;; itimer-autosave.el ends here |