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[emacs.git] / lisp / midnight.el
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1 ;;; midnight.el --- run something every midnight, e.g., kill old buffers.
3 ;;; Copyright (C) 1998 Free Software Foundation, Inc.
5 ;;; Author: Sam Steingold <sds@usa.net>
6 ;;; Maintainer: Sam Steingold <sds@usa.net>
7 ;;; Created: 1998-05-18
8 ;;; Keywords: utilities
10 ;; This file is part of GNU Emacs.
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.
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.
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.
27 ;;; Commentary:
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'.
39 ;;; Code:
41 (eval-when-compile
42 (require 'cl))
44 (require 'timer)
46 (defgroup midnight nil
47 "Run something every day at midnight."
48 :group 'calendar
49 :version "20.3")
51 (defcustom midnight-mode nil
52 "*Non-nil means run `midnight-hook' at midnight.
53 Setting this variable outside customize has no effect;
54 call `cancel-timer' or `timer-activate' on `midnight-timer' instead."
55 :type 'boolean
56 :group 'midnight
57 :require 'midnight
58 :initialize 'custom-initialize-default
59 :set (lambda (symb val)
60 (set symb val) (require 'midnight)
61 (if val (timer-activate midnight-timer)
62 (cancel-timer midnight-timer))))
64 ;;; time conversion
66 (defun midnight-time-float (num)
67 "Convert the float number of seconds since epoch to the list of 3 integers."
68 (let* ((div (ash 1 16)) (1st (floor num div)))
69 (list 1st (floor (- num (* (float div) 1st)))
70 (round (* 10000000 (mod num 1))))))
72 (defun midnight-buffer-display-time (&optional buf)
73 "Return the time-stamp of the given buffer, or current buffer, as float."
74 (with-current-buffer (or buf (current-buffer))
75 (when buffer-display-time (float-time buffer-display-time))))
77 ;;; clean-buffer-list stuff
79 (defcustom clean-buffer-list-delay-general 3
80 "*The number of days before any buffer becomes eligible for autokilling.
81 The autokilling is done by `clean-buffer-list' when is it in `midnight-hook'.
82 Currently displayed and/or modified (unsaved) buffers, as well as buffers
83 matching `clean-buffer-list-kill-never-buffer-names' and
84 `clean-buffer-list-kill-never-regexps' are excluded."
85 :type 'integer
86 :group 'midnight)
88 (defcustom clean-buffer-list-delay-special 3600
89 "*The number of seconds before some buffers become eligible for autokilling.
90 Buffers matched by `clean-buffer-list-kill-regexps' and
91 `clean-buffer-list-kill-buffer-names' are killed if they were last
92 displayed more than this many seconds ago."
93 :type 'integer
94 :group 'midnight)
96 (defcustom clean-buffer-list-kill-regexps nil
97 "*List of regexps saying which buffers will be killed at midnight.
98 If buffer name matches a regexp in the list and the buffer was not displayed
99 in the last `clean-buffer-list-delay-special' seconds, it is killed by
100 `clean-buffer-list' when is it in `midnight-hook'.
101 If a member of the list is a cons, its `car' is the regexp and its `cdr' is
102 the number of seconds to use instead of `clean-buffer-list-delay-special'.
103 See also `clean-buffer-list-kill-buffer-names',
104 `clean-buffer-list-kill-never-regexps' and
105 `clean-buffer-list-kill-never-buffer-names'."
106 :type '(repeat (regexp :tag "Regexp matching Buffer Name"))
107 :group 'midnight)
109 (defcustom clean-buffer-list-kill-buffer-names
110 '("*Help*" "*Apropos*" "*Man " "*Buffer List*" "*Compile-Log*" "*info*"
111 "*vc*" "*vc-diff*" "*diff*")
112 "*List of strings saying which buffers will be killed at midnight.
113 Buffers with names in this list, which were not displayed in the last
114 `clean-buffer-list-delay-special' seconds, are killed by `clean-buffer-list'
115 when is it in `midnight-hook'.
116 If a member of the list is a cons, its `car' is the name and its `cdr' is
117 the number of seconds to use instead of `clean-buffer-list-delay-special'.
118 See also `clean-buffer-list-kill-regexps',
119 `clean-buffer-list-kill-never-regexps' and
120 `clean-buffer-list-kill-never-buffer-names'."
121 :type '(repeat (string :tag "Buffer Name"))
122 :group 'midnight)
124 (defcustom clean-buffer-list-kill-never-buffer-names
125 '("*scratch*" "*Messages*")
126 "*List of buffer names which will never be killed by `clean-buffer-list'.
127 See also `clean-buffer-list-kill-never-regexps'.
128 Note that this does override `clean-buffer-list-kill-regexps' and
129 `clean-buffer-list-kill-buffer-names' so a buffer matching any of these
130 two lists will NOT be killed if it is also present in this list."
131 :type '(repeat (string :tag "Buffer Name"))
132 :group 'midnight)
135 (defcustom clean-buffer-list-kill-never-regexps '("^ \\*Minibuf-.*\\*$")
136 "*List of regexp saying which buffers will never be killed at midnight.
137 See also `clean-buffer-list-kill-never-buffer-names'.
138 Killing is done by `clean-buffer-list'.
139 Note that this does override `clean-buffer-list-kill-regexps' and
140 `clean-buffer-list-kill-buffer-names' so a buffer matching any of these
141 two lists will NOT be killed if it also matches anything in this list."
142 :type '(repeat (regexp :tag "Regexp matching Buffer Name"))
143 :group 'midnight)
145 (defun midnight-find (el ls test &optional key)
146 "A stopgap solution to the absence of `find' in ELisp."
147 (dolist (rr ls)
148 (when (funcall test (if key (funcall key rr) rr) el)
149 (return rr))))
151 (defun clean-buffer-list-delay (name)
152 "Return the delay, in seconds, before killing a buffer named NAME.
153 Uses `clean-buffer-list-kill-buffer-names', `clean-buffer-list-kill-regexps'
154 `clean-buffer-list-delay-general' and `clean-buffer-list-delay-special'.
155 Autokilling is done by `clean-buffer-list'."
156 (or (assoc-default name clean-buffer-list-kill-buffer-names 'string=
157 clean-buffer-list-delay-special)
158 (assoc-default name clean-buffer-list-kill-regexps 'string-match
159 clean-buffer-list-delay-special)
160 (* clean-buffer-list-delay-general 24 60 60)))
162 ;;;###autoload
163 (defun clean-buffer-list ()
164 "Kill old buffers that have not been displayed recently.
165 The relevant variables are `clean-buffer-list-delay-general',
166 `clean-buffer-list-delay-special', `clean-buffer-list-kill-buffer-names',
167 `clean-buffer-list-kill-never-buffer-names',
168 `clean-buffer-list-kill-regexps' and
169 `clean-buffer-list-kill-never-regexps'.
170 While processing buffers, this procedure displays messages containing
171 the current date/time, buffer name, how many seconds ago it was
172 displayed (can be nil if the buffer was never displayed) and its
173 lifetime, i.e., its \"age\" when it will be purged."
174 (interactive)
175 (let ((tm (float-time)) bts (ts (format-time-string "%Y-%m-%d %T"))
176 (bufs (buffer-list)) buf delay cbld bn)
177 (while (setq buf (pop bufs))
178 (setq bts (midnight-buffer-display-time buf) bn (buffer-name buf)
179 delay (if bts (- tm bts) 0) cbld (clean-buffer-list-delay bn))
180 (message "[%s] `%s' [%s %d]" ts bn (if bts (round delay)) cbld)
181 (unless (or (midnight-find bn clean-buffer-list-kill-never-regexps
182 'string-match)
183 (midnight-find bn clean-buffer-list-kill-never-buffer-names
184 'string-equal)
185 (get-buffer-process buf)
186 (and (buffer-file-name buf) (buffer-modified-p buf))
187 (get-buffer-window buf 'visible) (< delay cbld))
188 (message "[%s] killing `%s'" ts bn)
189 (kill-buffer buf)))))
191 ;;; midnight hook
193 (defvar midnight-period (* 24 60 60)
194 "The number of seconds in a day--the delta for `midnight-timer'.")
196 (defcustom midnight-hook '(clean-buffer-list)
197 "The hook run `midnight-delay' seconds after midnight every day.
198 The default value is `clean-buffer-list'."
199 :type 'hook
200 :group 'midnight)
202 (defun midnight-next ()
203 "Return the number of seconds till the next midnight."
204 (multiple-value-bind (sec min hrs) (decode-time)
205 (- (* 24 60 60) (* 60 60 hrs) (* 60 min) sec)))
207 (defvar midnight-timer nil
208 "Timer running the `midnight-hook' `midnight-delay' seconds after midnight.
209 Use `cancel-timer' to stop it and `midnight-delay-set' to change
210 the time when it is run.")
212 ;;;###autoload
213 (defun midnight-delay-set (symb tm)
214 "Modify `midnight-timer' according to `midnight-delay'.
215 Sets the first argument SYMB (which must be symbol `midnight-delay')
216 to its second argument TM."
217 (assert (eq symb 'midnight-delay) t
218 "Illegal argument to `midnight-delay-set': `%s'" symb)
219 (set symb tm)
220 (when (timerp midnight-timer) (cancel-timer midnight-timer))
221 (setq midnight-timer
222 (run-at-time (if (numberp tm) (+ (midnight-next) tm) tm)
223 midnight-period 'run-hooks 'midnight-hook)))
225 (defcustom midnight-delay 3600
226 "*The number of seconds after the midnight when the `midnight-timer' is run.
227 You should set this variable before loading midnight.el, or
228 set it by calling `midnight-delay-set', or use `custom'.
229 If you wish, you can use a string instead, it will be passed as the
230 first argument to `run-at-time'."
231 :type 'sexp
232 :set 'midnight-delay-set
233 :group 'midnight)
235 (provide 'midnight)
237 ;;; midnight.el ends here