summaryrefslogtreecommitdiff
path: root/lisp/time-stamp.el
blob: d7e09580d30ec18b5ba763526fbd3377a5997039 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
;;; time-stamp.el --- Maintain last change time stamps in files edited by Emacs
;;; Copyright 1989, 1993 Free Software Foundation, Inc.

;; Maintainer: Stephen Gildea <gildea@lcs.mit.edu>
;; Time-stamp: <94/02/14 15:02:07 gildea>
;; Keywords: tools

;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

;;; Commentary:

;;; If you put a time stamp template anywhere in the first 8 lines of a file,
;;; it can be updated every time you save the file.  See the top of
;;; time-stamp.el for a sample.  The template looks like one of the following:
;;;     Time-stamp: <>
;;;     Time-stamp: " "
;;; The time stamp is written between the brackets or quotes, resulting in
;;;     Time-stamp: <93/06/18 10:26:51 gildea>
;;; Here is an example which puts the file name and time stamp in the binary:
;;; static char *time_stamp = "sdmain.c Time-stamp: <>";

;;; To activate automatic time stamping, add this code to your .emacs file:
;;;
;;; (if (not (memq 'time-stamp write-file-hooks))
;;;     (setq write-file-hooks
;;;           (cons 'time-stamp write-file-hooks)))
;;;
;;; In Emacs 18 you will also need
;;; (autoload 'time-stamp "time-stamp" "Update the time stamp in a buffer." t)

;;; Change Log:

;;; Originally based on the 19 Dec 88 version of
;;;   date.el by John Sturdy <mcvax!harlqn.co.uk!jcgs@uunet.uu.net>

;;; Code:

(defvar time-stamp-active t
  "*Non-nil to enable time-stamping of files.  See the function time-stamp.")

(defvar time-stamp-format
  '(time-stamp-yy/mm/dd time-stamp-hh:mm:ss user-login-name)
  "*A list of functions to call to generate the time stamp string.
Each element of the list is called as a function and the results are
concatenated together separated by spaces.  Elements may also be strings,
which are included verbatim.  Spaces are not inserted around literal strings.")

;;; Do not change time-stamp-line-limit, time-stamp-start, or
;;; time-stamp-end in your .emacs or you will be incompatible
;;; with other people's files!  If you must change them,
;;; do so only in the local variables section of the file itself.

(defvar time-stamp-line-limit 8	    ;Do not change!
  "Number of lines at the beginning of a file that are searched.
The patterns `time-stamp-start' and `time-stamp-end' must be found on one
of the first `time-stamp-line-limit' lines of the file for the file to
be time-stamped by \\[time-stamp].

Do not change `time-stamp-line-limit', `time-stamp-start', or
`time-stamp-end' for yourself or you will be incompatible
with other people's files!  If you must change them for some application,
do so in the local variables section of the time-stamped file itself.")


(defvar time-stamp-start "Time-stamp:[ \t]+\\\\?[\"<]+"    ;Do not change!
  "Regexp after which the time stamp is written by \\[time-stamp].
See also the variables `time-stamp-end' and `time-stamp-line-limit'.

Do not change `time-stamp-line-limit', `time-stamp-start', or
`time-stamp-end' for yourself or you will be incompatible
with other people's files!  If you must change them for some application,
do so in the local variables section of the time-stamped file itself.")


(defvar time-stamp-end "\\\\?[\">]"    ;Do not change!
  "Regexp marking the text after the time stamp.
\\[time-stamp] deletes the text between the first match of `time-stamp-start'
and the following match of `time-stamp-end' on the same line,
then writes the time stamp specified by `time-stamp-format' between them.

Do not change `time-stamp-line-limit', `time-stamp-start', or
`time-stamp-end' for yourself or you will be incompatible
with other people's files!  If you must change them for some application,
do so in the local variables section of the time-stamped file itself.")


;;;###autoload
(defun time-stamp ()
  "Update the time stamp string in the buffer.
If you put a time stamp template anywhere in the first 8 lines of a file,
it can be updated every time you save the file.  See the top of
`time-stamp.el' for a sample.  The template looks like one of the following:
    Time-stamp: <>
    Time-stamp: \" \"
The time stamp is written between the brackets or quotes, resulting in
    Time-stamp: <93/06/18 10:26:51 gildea>
Only does its thing if the variable  time-stamp-active  is non-nil.
Typically used on  write-file-hooks  for automatic time-stamping.
The format of the time stamp is determined by the variable  time-stamp-format.
The variables time-stamp-line-limit, time-stamp-start, and time-stamp-end
control finding the template."
  (interactive)
  (if time-stamp-active
       (let ((case-fold-search nil))
	 (if (and (stringp time-stamp-start)
		  (stringp time-stamp-end))
	     (save-excursion
	       (goto-char (point-min))
	       (if (re-search-forward time-stamp-start
				      (save-excursion
					(forward-line time-stamp-line-limit)
					(point))
				      t)
		   (let ((start (point)))
		     (if (re-search-forward time-stamp-end
					    (save-excursion (end-of-line) (point))
					    t)
			 (let ((end (match-beginning 0)))
			   (delete-region start end)
			   (goto-char start)
			   (insert (time-stamp-string))
			   (setq end (point))
			   ;; remove any tabs used to format the time stamp
			   (goto-char start)
			   (if (search-forward "\t" end t)
			       (untabify start end)))))))
	   ;; don't signal an error in a write-file-hook
	   (message "time-stamp-start or time-stamp-end is not a string"))))
  ;; be sure to return nil so can be used on write-file-hooks
  nil)

(defun time-stamp-string ()
  "Generate the new string to be inserted by \\[time-stamp]."
  (time-stamp-fconcat time-stamp-format " "))

(defun time-stamp-fconcat (list sep)
  "Similar to (mapconcat 'funcall LIST SEP) but LIST allows literals.
If an element of LIST is a symbol, it is funcalled to get the string to use;
the separator SEP is used between two strings obtained by funcalling a
symbol.  Otherwise the element itself is inserted; no separator is used
around literals."
  (let ((return-string "")
	(insert-sep-p nil))
    (while list
      (cond ((symbolp (car list))
	     (if insert-sep-p
		 (setq return-string (concat return-string sep)))
	     (setq return-string (concat return-string (funcall (car list))))
	     (setq insert-sep-p t))
	    (t
	     (setq return-string (concat return-string (car list)))
	     (setq insert-sep-p nil)))
      (setq list (cdr list)))
    return-string))


(defconst time-stamp-month-numbers
  '(("Jan" . 1) ("Feb" . 2) ("Mar" . 3) ("Apr" . 4) ("May" . 5) ("Jun" . 6)
    ("Jul" . 7) ("Aug" . 8) ("Sep" . 9) ("Oct" . 10) ("Nov" . 11) ("Dec" . 12))
  "Alist of months and their number.")

(defconst time-stamp-month-full-names
  ["(zero)" "January" "February" "March" "April" "May" "June"
   "July" "August" "September" "October" "November" "December"])

(defvar time-stamp-mail-host nil
  "*Name of the host where the user receives mail.
See the function `time-stamp-mail-host-name'.")

;;; Some useful functions to use in time-stamp-format

;;; Could generate most of a message-id with
;;; '(time-stamp-yymmdd "" time-stamp-hhmm "@" time-stamp-mail-host-name)

(defun time-stamp-mail-host-name ()
  "Return the name of the host where the user receives mail.
This is the value of `time-stamp-mail-host' if bound and a string,
otherwise the value of the function system-name.
This function may be usefully referenced by `time-stamp-format'."
  (or (and (boundp 'time-stamp-mail-host)
	   (stringp time-stamp-mail-host)
	   time-stamp-mail-host)
      (system-name)))

;;; pretty form, suitable for a title page

(defun time-stamp-month-dd-yyyy ()
  "Return the current date as a string in \"Month DD, YYYY\" form."
  (let ((date (current-time-string)))
    (format "%s %d, %s"
	    (aref time-stamp-month-full-names
		  (cdr (assoc (substring date 4 7) time-stamp-month-numbers)))
	    (string-to-int (substring date 8 10))
	    (substring date -4))))

;;; same as __DATE__ in ANSI C

(defun time-stamp-mon-dd-yyyy ()
  "Return the current date as a string in \"Mon DD YYYY\" form.
The first character of DD is space if the value is less than 10."
  (let ((date (current-time-string)))
    (format "%s %2d %s"
	    (substring date 4 7)
	    (string-to-int (substring date 8 10))
	    (substring date -4))))

;;; RFC 822 date

(defun time-stamp-dd-mon-yy ()
  "Return the current date as a string in \"DD Mon YY\" form."
  (let ((date (current-time-string)))
    (format "%02d %s %s"
	    (string-to-int (substring date 8 10))
	    (substring date 4 7)
	    (substring date -2))))

;;; RCS 3 date

(defun time-stamp-yy/mm/dd ()
  "Return the current date as a string in \"YY/MM/DD\" form."
  (let ((date (current-time-string)))
    (format "%s/%02d/%02d"
	    (substring date -2)
	    (cdr (assoc (substring date 4 7) time-stamp-month-numbers))
	    (string-to-int (substring date 8 10)))))

;;; RCS 5 date

(defun time-stamp-yyyy/mm/dd ()
  "Return the current date as a string in \"YYYY/MM/DD\" form."
  (let ((date (current-time-string)))
    (format "%s/%02d/%02d"
	    (substring date -4)
	    (cdr (assoc (substring date 4 7) time-stamp-month-numbers))
	    (string-to-int (substring date 8 10)))))

;;; ISO 8601 date

(defun time-stamp-yyyy-mm-dd ()
  "Return the current date as a string in \"YYYY-MM-DD\" form."
  (let ((date (current-time-string)))
    (format "%s-%02d-%02d"
	    (substring date -4)
	    (cdr (assoc (substring date 4 7) time-stamp-month-numbers))
	    (string-to-int (substring date 8 10)))))

(defun time-stamp-yymmdd ()
  "Return the current date as a string in \"YYMMDD\" form."
  (let ((date (current-time-string)))
    (format "%s%02d%02d"
	    (substring date -2)
	    (cdr (assoc (substring date 4 7) time-stamp-month-numbers))
	    (string-to-int (substring date 8 10)))))

(defun time-stamp-hh:mm:ss ()
  "Return the current time as a string in \"HH:MM:SS\" form."
  (substring (current-time-string) 11 19))

(defun time-stamp-hhmm ()
  "Return the current time as a string in \"HHMM\" form."
  (let ((date (current-time-string)))
    (concat (substring date 11 13)
	    (substring date 14 16))))

(provide 'time-stamp)

;;; time-stamp.el ends here