1 ;;; midnight.el --- run something every midnight, e.g., kill old buffers
3 ;; Copyright (C) 1998, 2001, 2002, 2003, 2004, 2005,
4 ;; 2006, 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
6 ;; Author: Sam Steingold <sds@usa.net>
7 ;; Maintainer: Sam Steingold <sds@usa.net>
11 ;; This file is part of GNU Emacs.
13 ;; GNU Emacs is free software: you can redistribute it and/or modify
14 ;; it under the terms of the GNU General Public License as published by
15 ;; the Free Software Foundation, either version 3 of the License, or
16 ;; (at your option) any later version.
18 ;; GNU Emacs is distributed in the hope that it will be useful,
19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 ;; GNU General Public License for more details.
23 ;; You should have received a copy of the GNU General Public License
24 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
28 ;; To use the file, put (require 'midnight) into your .emacs. Then, at
29 ;; midnight, Emacs will run the normal hook `midnight-hook'. You can
30 ;; put whatever you like there, say, `calendar'; by default there is
31 ;; only one function there - `clean-buffer-list'. It will kill the
32 ;; buffers matching `clean-buffer-list-kill-buffer-names' and
33 ;; `clean-buffer-list-kill-regexps' and the buffers which where last
34 ;; displayed more than `clean-buffer-list-delay-general' days ago,
35 ;; keeping `clean-buffer-list-kill-never-buffer-names' and
36 ;; `clean-buffer-list-kill-never-regexps'.
45 (defgroup midnight nil
46 "Run something every day at midnight."
50 (defvar midnight-timer nil
51 "Timer running the `midnight-hook' `midnight-delay' seconds after midnight.
52 Use `cancel-timer' to stop it and `midnight-delay-set' to change
53 the time when it is run.")
55 (defcustom midnight-mode nil
56 "Non-nil means run `midnight-hook' at midnight.
57 Setting this variable outside customize has no effect;
58 call `cancel-timer' or `timer-activate' on `midnight-timer' instead."
62 :initialize
'custom-initialize-default
63 :set
(lambda (symb val
)
64 (set symb val
) (require 'midnight
)
65 (if val
(timer-activate midnight-timer
)
66 (cancel-timer midnight-timer
))))
70 (defun midnight-time-float (num)
71 "Convert the float number of seconds since epoch to the list of 3 integers."
72 (let* ((div (ash 1 16)) (1st (floor num div
)))
73 (list 1st
(floor (- num
(* (float div
) 1st
)))
74 (round (* 10000000 (mod num
1))))))
76 (defun midnight-buffer-display-time (&optional buffer
)
77 "Return the time-stamp of BUFFER, or current buffer, as float."
78 (with-current-buffer (or buffer
(current-buffer))
79 (when buffer-display-time
(float-time buffer-display-time
))))
81 ;;; clean-buffer-list stuff
83 (defcustom clean-buffer-list-delay-general
3
84 "The number of days before any buffer becomes eligible for autokilling.
85 The autokilling is done by `clean-buffer-list' when is it in `midnight-hook'.
86 Currently displayed and/or modified (unsaved) buffers, as well as buffers
87 matching `clean-buffer-list-kill-never-buffer-names' and
88 `clean-buffer-list-kill-never-regexps' are excluded."
92 (defcustom clean-buffer-list-delay-special
3600
93 "The number of seconds before some buffers become eligible for autokilling.
94 Buffers matched by `clean-buffer-list-kill-regexps' and
95 `clean-buffer-list-kill-buffer-names' are killed if they were last
96 displayed more than this many seconds ago."
100 (defcustom clean-buffer-list-kill-regexps nil
101 "List of regexps saying which buffers will be killed at midnight.
102 If buffer name matches a regexp in the list and the buffer was not displayed
103 in the last `clean-buffer-list-delay-special' seconds, it is killed by
104 `clean-buffer-list' when is it in `midnight-hook'.
105 If a member of the list is a cons, its `car' is the regexp and its `cdr' is
106 the number of seconds to use instead of `clean-buffer-list-delay-special'.
107 See also `clean-buffer-list-kill-buffer-names',
108 `clean-buffer-list-kill-never-regexps' and
109 `clean-buffer-list-kill-never-buffer-names'."
110 :type
'(repeat (regexp :tag
"Regexp matching Buffer Name"))
113 (defcustom clean-buffer-list-kill-buffer-names
114 '("*Help*" "*Apropos*" "*Man " "*Buffer List*" "*Compile-Log*" "*info*"
115 "*vc*" "*vc-diff*" "*diff*")
116 "List of strings saying which buffers will be killed at midnight.
117 Buffers with names in this list, which were not displayed in the last
118 `clean-buffer-list-delay-special' seconds, are killed by `clean-buffer-list'
119 when is it in `midnight-hook'.
120 If a member of the list is a cons, its `car' is the name and its `cdr' is
121 the number of seconds to use instead of `clean-buffer-list-delay-special'.
122 See also `clean-buffer-list-kill-regexps',
123 `clean-buffer-list-kill-never-regexps' and
124 `clean-buffer-list-kill-never-buffer-names'."
125 :type
'(repeat (string :tag
"Buffer Name"))
128 (defcustom clean-buffer-list-kill-never-buffer-names
129 '("*scratch*" "*Messages*" "*server*")
130 "List of buffer names which will never be killed by `clean-buffer-list'.
131 See also `clean-buffer-list-kill-never-regexps'.
132 Note that this does override `clean-buffer-list-kill-regexps' and
133 `clean-buffer-list-kill-buffer-names' so a buffer matching any of these
134 two lists will NOT be killed if it is also present in this list."
135 :type
'(repeat (string :tag
"Buffer Name"))
138 (defcustom clean-buffer-list-kill-never-regexps
'("^ \\*Minibuf-.*\\*$")
139 "List of regexp saying which buffers will never be killed at midnight.
140 See also `clean-buffer-list-kill-never-buffer-names'.
141 Killing is done by `clean-buffer-list'.
142 Note that this does override `clean-buffer-list-kill-regexps' and
143 `clean-buffer-list-kill-buffer-names' so a buffer matching any of these
144 two lists will NOT be killed if it also matches anything in this list."
145 :type
'(repeat (regexp :tag
"Regexp matching Buffer Name"))
148 (defun midnight-find (el ls test
&optional key
)
149 "A stopgap solution to the absence of `find' in ELisp."
151 (when (funcall test
(if key
(funcall key rr
) rr
) el
)
154 (defun clean-buffer-list-delay (name)
155 "Return the delay, in seconds, before killing a buffer named NAME.
156 Uses `clean-buffer-list-kill-buffer-names', `clean-buffer-list-kill-regexps'
157 `clean-buffer-list-delay-general' and `clean-buffer-list-delay-special'.
158 Autokilling is done by `clean-buffer-list'."
159 (or (assoc-default name clean-buffer-list-kill-buffer-names
'string
=
160 clean-buffer-list-delay-special
)
161 (assoc-default name clean-buffer-list-kill-regexps
'string-match
162 clean-buffer-list-delay-special
)
163 (* clean-buffer-list-delay-general
24 60 60)))
166 (defun clean-buffer-list ()
167 "Kill old buffers that have not been displayed recently.
168 The relevant variables 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
172 `clean-buffer-list-kill-never-regexps'.
173 While processing buffers, this procedure displays messages containing
174 the current date/time, buffer name, how many seconds ago it was
175 displayed (can be nil if the buffer was never displayed) and its
176 lifetime, i.e., its \"age\" when it will be purged."
178 (let ((tm (float-time)) bts
(ts (format-time-string "%Y-%m-%d %T"))
180 (dolist (buf (buffer-list))
181 (when (buffer-live-p buf
)
182 (setq bts
(midnight-buffer-display-time buf
) bn
(buffer-name buf
)
183 delay
(if bts
(- tm bts
) 0) cbld
(clean-buffer-list-delay bn
))
184 (message "[%s] `%s' [%s %d]" ts bn
(if bts
(round delay
)) cbld
)
185 (unless (or (midnight-find bn clean-buffer-list-kill-never-regexps
187 (midnight-find bn clean-buffer-list-kill-never-buffer-names
189 (get-buffer-process buf
)
190 (and (buffer-file-name buf
) (buffer-modified-p buf
))
191 (get-buffer-window buf
'visible
) (< delay cbld
))
192 (message "[%s] killing `%s'" ts bn
)
193 (kill-buffer buf
))))))
197 (defvar midnight-period
(* 24 60 60)
198 "The number of seconds in a day--the delta for `midnight-timer'.")
200 (defcustom midnight-hook
'(clean-buffer-list)
201 "The hook run `midnight-delay' seconds after midnight every day.
202 The default value is `clean-buffer-list'."
206 (defun midnight-next ()
207 "Return the number of seconds till the next midnight."
208 (multiple-value-bind (sec min hrs
)
209 (values-list (decode-time))
210 (- (* 24 60 60) (* 60 60 hrs
) (* 60 min
) sec
)))
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 "Invalid argument to `midnight-delay-set': `%s'")
220 (when (timerp midnight-timer
) (cancel-timer 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'."
232 :set
'midnight-delay-set
237 ;; arch-tag: a5979be9-2890-46a3-ba84-791f0a4a6e80
238 ;;; midnight.el ends here