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ac06bd0f RS |
1 | ;;; midnight.el --- run something every midnight, e.g., kill old buffers. |
2 | ||
3 | ;;; Copyright (C) 1998 Free Software Foundation, Inc. | |
4 | ||
5 | ;;; Author: Sam Steingold <sds@usa.net> | |
6 | ;;; Maintainer: Sam Steingold <sds@usa.net> | |
7 | ;;; Created: 1998-05-18 | |
8 | ;;; Keywords: utilities | |
9 | ||
10 | ;; This file is part of GNU Emacs. | |
11 | ||
12 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
13 | ;; it under the terms of the GNU General Public License as published by | |
14 | ;; the Free Software Foundation; either version 2, or (at your option) | |
15 | ;; any later version. | |
16 | ||
17 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;; GNU General Public License for more details. | |
21 | ||
22 | ;; You should have received a copy of the GNU General Public License | |
23 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
24 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
25 | ;; Boston, MA 02111-1307, USA. | |
26 | ||
27 | ;;; Commentary: | |
28 | ||
29 | ;; To use the file, put (require 'midnight) into your .emacs. Then, at | |
30 | ;; midnight, Emacs will run the normal hook `midnight-hook'. You can | |
31 | ;; put whatever you like there, say, `calendar'; by default there is | |
32 | ;; only one function there - `clean-buffer-list'. It will kill the | |
33 | ;; buffers matching `clean-buffer-list-kill-buffer-names' and | |
34 | ;; `clean-buffer-list-kill-regexps' and the buffers which where last | |
35 | ;; displayed more than `clean-buffer-list-delay-general' days ago, | |
36 | ;; keeping `clean-buffer-list-kill-never-buffer-names' and | |
37 | ;; `clean-buffer-list-kill-never-regexps'. | |
38 | ||
849ac835 RS |
39 | (eval-when-compile |
40 | (require 'cl) | |
41 | (require 'timer)) | |
ac06bd0f RS |
42 | |
43 | (defgroup midnight nil | |
44 | "Run something every day at midnight." | |
1e484d64 DN |
45 | :group 'calendar |
46 | :version "20.3") | |
ac06bd0f | 47 | |
e9d7cff0 RS |
48 | (defcustom midnight-mode t |
49 | "*Non-nil means run `midnight-hook' at midnight. | |
50 | Setting this variable outside customize has no effect; | |
51 | call `cancel-timer' or `timer-activate' on `midnight-timer' instead." | |
52 | :type 'boolean | |
53 | :group 'midnight | |
54 | :require 'midnight | |
e9d7cff0 RS |
55 | :set (lambda (symb val) |
56 | (set symb val) (require 'midnight) | |
57 | (if val (timer-activate midnight-timer) | |
58 | (cancel-timer midnight-timer)))) | |
59 | ||
ac06bd0f RS |
60 | ;;; time conversion |
61 | ||
62 | (defun float-time (&optional tm) | |
63 | "Convert `current-time' to a float number of seconds." | |
64 | (multiple-value-bind (s0 s1 s2) (or tm (current-time)) | |
65 | (+ (* (float (ash 1 16)) s0) (float s1) (* 0.0000001 s2)))) | |
66 | ||
67 | (defun time-float (num) | |
68 | "Convert the float number of seconds since epoch to the list of 3 integers." | |
69 | (let* ((div (ash 1 16)) (1st (floor num div))) | |
70 | (list 1st (floor (- num (* (float div) 1st))) | |
71 | (round (* 10000000 (mod num 1)))))) | |
72 | ||
73 | (defun buffer-display-time (&optional buf) | |
74 | "Return the time-stamp of the given buffer, or current buffer, as float." | |
75 | (save-excursion | |
76 | (set-buffer (or buf (current-buffer))) | |
77 | (when buffer-display-time (float-time buffer-display-time)))) | |
78 | ||
79 | ;;; clean-buffer-list stuff | |
80 | ||
81 | (defcustom clean-buffer-list-delay-general 3 | |
82 | "*The number of days before any buffer becomes eligible for autokilling. | |
83 | The autokilling is done by `clean-buffer-list' when is it in `midnight-hook'. | |
84 | Currently displayed and/or modified (unsaved) buffers, as well as buffers | |
85 | matching `clean-buffer-list-kill-never-buffer-names' and | |
86 | `clean-buffer-list-kill-never-regexps' are excluded." | |
87 | :type 'integer | |
1e484d64 | 88 | :group 'midnight) |
ac06bd0f RS |
89 | |
90 | (defcustom clean-buffer-list-delay-special 3600 | |
91 | "*The number of seconds before some buffers become eligible for autokilling. | |
92 | Buffers matched by `clean-buffer-list-kill-regexps' and | |
93 | `clean-buffer-list-kill-buffer-names' are killed if they were last | |
94 | displayed more than this many seconds ago." | |
95 | :type 'integer | |
1e484d64 | 96 | :group 'midnight) |
ac06bd0f | 97 | |
b2f9ab3c | 98 | (defcustom clean-buffer-list-kill-regexps nil |
ac06bd0f RS |
99 | "*List of regexps saying which buffers will be killed at midnight. |
100 | If buffer name matches a regexp in the list and the buffer was not displayed | |
101 | in the last `clean-buffer-list-delay-special' seconds, it is killed by | |
102 | `clean-buffer-list' when is it in `midnight-hook'. | |
103 | If a member of the list is a cons, it's `car' is the regexp and its `cdr' is | |
104 | the number of seconds to use instead of `clean-buffer-list-delay-special'. | |
105 | See also `clean-buffer-list-kill-buffer-names', | |
106 | `clean-buffer-list-kill-never-regexps' and | |
107 | `clean-buffer-list-kill-never-buffer-names'." | |
108 | :type 'list | |
1e484d64 | 109 | :group 'midnight) |
ac06bd0f RS |
110 | |
111 | (defcustom clean-buffer-list-kill-buffer-names | |
b2f9ab3c RS |
112 | '("*Help*" "*Apropos*" "*Man " "*Buffer List*" "*Compile-Log*" "*info*" |
113 | "*vc*" "*vc-diff*") | |
ac06bd0f RS |
114 | "*List of strings saying which buffers will be killed at midnight. |
115 | Buffers with names in this list, which were not displayed in the last | |
116 | `clean-buffer-list-delay-special' seconds, are killed by `clean-buffer-list' | |
117 | when is it in `midnight-hook'. | |
118 | If a member of the list is a cons, it's `car' is the name and its `cdr' is | |
119 | the number of seconds to use instead of `clean-buffer-list-delay-special'. | |
120 | See also `clean-buffer-list-kill-regexps', | |
121 | `clean-buffer-list-kill-never-regexps' and | |
122 | `clean-buffer-list-kill-never-buffer-names'." | |
123 | :type 'list | |
1e484d64 | 124 | :group 'midnight) |
ac06bd0f RS |
125 | |
126 | (defcustom clean-buffer-list-kill-never-buffer-names | |
127 | '("*scratch*" "*Messages*") | |
128 | "*List of buffer names which will never be killed by `clean-buffer-list'. | |
129 | See also `clean-buffer-list-kill-never-regexps'. | |
130 | Note that this does override `clean-buffer-list-kill-regexps' and | |
131 | `clean-buffer-list-kill-buffer-names' so a buffer matching any of these | |
132 | two lists will NOT be killed if it is also present in this list." | |
133 | :type 'list | |
1e484d64 DN |
134 | :group 'midnight) |
135 | ||
ac06bd0f RS |
136 | |
137 | (defcustom clean-buffer-list-kill-never-regexps '("^ \*Minibuf-.*\*$") | |
138 | "*List of regexp saying which buffers will never be killed at midnight. | |
139 | See also `clean-buffer-list-kill-never-buffer-names'. | |
140 | Killing is done by `clean-buffer-list'. | |
141 | Note that this does override `clean-buffer-list-kill-regexps' and | |
142 | `clean-buffer-list-kill-buffer-names' so a buffer matching any of these | |
143 | two lists will NOT be killed if it also matches anything in this list." | |
144 | :type 'list | |
1e484d64 | 145 | :group 'midnight) |
ac06bd0f RS |
146 | |
147 | (defun midnight-find (el ls test &optional key) | |
148 | "A stopgap solution to the absence of `find' in ELisp." | |
149 | (if (fboundp 'find) | |
150 | (find el ls :test test :key (or key 'eql)) | |
849ac835 RS |
151 | (dolist (rr ls) |
152 | (when (funcall test el (if key (funcall key rr) rr)) | |
153 | (return rr))))) | |
154 | ||
b2f9ab3c RS |
155 | (defun clean-buffer-list-delay (name) |
156 | "Return the delay, in seconds, before killing a buffer named NAME. | |
ac06bd0f RS |
157 | Uses `clean-buffer-list-kill-buffer-names', `clean-buffer-list-kill-regexps' |
158 | `clean-buffer-list-delay-general' and `clean-buffer-list-delay-special'. | |
159 | Autokilling is done by `clean-buffer-list'." | |
b2f9ab3c | 160 | (or (assoc-default name clean-buffer-list-kill-buffer-names 'string= |
849ac835 | 161 | clean-buffer-list-delay-special) |
b2f9ab3c | 162 | (assoc-default name clean-buffer-list-kill-regexps 'string-match |
849ac835 RS |
163 | clean-buffer-list-delay-special) |
164 | (* clean-buffer-list-delay-general 24 60 60))) | |
ac06bd0f RS |
165 | |
166 | (defun clean-buffer-list () | |
b2f9ab3c | 167 | "Kill old buffers that have not been displayed recently. |
ac06bd0f RS |
168 | The relevant vartiables are `clean-buffer-list-delay-general', |
169 | `clean-buffer-list-delay-special', `clean-buffer-list-kill-buffer-names', | |
170 | `clean-buffer-list-kill-never-buffer-names', | |
171 | `clean-buffer-list-kill-regexps' and `clean-buffer-list-kill-never-regexps'." | |
172 | (interactive) | |
173 | (let ((tm (float-time)) bts (ts (format-time-string "%Y-%m-%d %T")) bn) | |
174 | (dolist (buf (buffer-list)) | |
175 | (message "[%s] processing `%s'..." ts buf) | |
176 | (setq bts (buffer-display-time buf) bn (buffer-name buf)) | |
849ac835 | 177 | (unless (or (midnight-find bn clean-buffer-list-kill-never-regexps |
ac06bd0f RS |
178 | 'string-match) |
179 | (midnight-find bn clean-buffer-list-kill-never-buffer-names | |
180 | 'string-equal) | |
181 | (buffer-modified-p buf) (get-buffer-window buf 'visible) | |
182 | (null bts) (< (- tm bts) (clean-buffer-list-delay bn))) | |
183 | (message "[%s] killing `%s'" ts bn) | |
184 | (kill-buffer buf))))) | |
185 | ||
186 | ;;; midnight hook | |
187 | ||
188 | (defvar midnight-period (* 24 60 60) | |
b2f9ab3c | 189 | "The number of seconds in a day--the delta for `midnight-timer'.") |
ac06bd0f RS |
190 | |
191 | (defcustom midnight-hook 'clean-buffer-list | |
192 | "The hook run `midnight-delay' seconds after midnight every day. | |
193 | The default value is `clean-buffer-list'." | |
194 | :type 'hook | |
1e484d64 | 195 | :group 'midnight) |
ac06bd0f RS |
196 | |
197 | (defun midnight-next () | |
198 | "Return the number of seconds till the next midnight." | |
199 | (multiple-value-bind (sec min hrs) (decode-time) | |
200 | (- (* 24 60 60) (* 60 60 hrs) (* 60 min) sec))) | |
201 | ||
202 | (defvar midnight-timer nil | |
203 | "Timer running the `midnight-hook' `midnight-delay' seconds after midnight. | |
204 | Use `cancel-timer' to stop it and `midnight-delay-set' to change | |
205 | the time when it is run.") | |
206 | ||
207 | ;;;###autoload | |
208 | (defun midnight-delay-set (symb tm) | |
209 | "Modify `midnight-timer' according to `midnight-delay'. | |
210 | Sets the first argument (which must be symbol `midnight-delay') | |
211 | to its second argument." | |
212 | (unless (eq symb 'midnight-delay) | |
213 | (error "Illegal argument to `midnight-delay-set': `%s'" symb)) | |
214 | (set symb tm) | |
215 | (when (timerp midnight-timer) (cancel-timer midnight-timer)) | |
216 | (setq midnight-timer | |
217 | (run-at-time (if (numberp tm) (+ (midnight-next) tm) tm) | |
e9d7cff0 RS |
218 | midnight-period 'midnight-timer-function))) |
219 | ||
220 | (defun midnight-timer-function () | |
221 | "This is the function run by the `midnight-mode' timer once each day." | |
cbb41490 | 222 | (run-hooks 'midnight-hook)) |
ac06bd0f RS |
223 | |
224 | (defcustom midnight-delay 3600 | |
225 | "*The number of seconds after the midnight when the `midnight-timer' is run. | |
226 | You should set this variable before loading midnight.el, or | |
227 | set it by calling `midnight-delay-set', or use `custom'. | |
228 | If you wish, you can use a string instead, it will be passed as the | |
229 | first argument to `run-at-time'." | |
230 | :type 'sexp | |
231 | :set 'midnight-delay-set | |
1e484d64 | 232 | :group 'midnight) |
ac06bd0f RS |
233 | |
234 | (provide 'midnight) | |
235 | ||
236 | ;;; midnight.el ends here |