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emacs/lisp/time-stamp.el
Richard M. Stallman cd1292d1d4 Comment change.
1995-04-13 21:13:31 +00:00

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;;; time-stamp.el --- Maintain last change time stamps in files edited by Emacs
;;; Copyright 1989, 1993, 1994, 1995 Free Software Foundation, Inc.
;; Maintainer: Stephen Gildea <gildea@lcs.mit.edu>
;; Gildea's Last Time-stamp: <95/04/13 13:38:48 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: <95/01/18 10:20:51 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 in GNU Emacs 19, add this code
;;; to your .emacs file:
;;; (add-hook 'write-file-hooks 'time-stamp)
;;;
;;; In Emacs 18 you will need to do this instead:
;;; (if (not (memq 'time-stamp write-file-hooks))
;;; (setq write-file-hooks
;;; (cons 'time-stamp write-file-hooks)))
;;; (autoload 'time-stamp "time-stamp" "Update the time stamp in a buffer." t)
;;; See the documentation for the function `time-stamp' for more details.
;;; Change Log:
;;; Originally based on the 19 Dec 88 version of
;;; date.el by John Sturdy <mcvax!harlqn.co.uk!jcgs@uunet.uu.net>
;;; version 2, January 1995: replaced functions with %-escapes
;;; Code:
(defvar time-stamp-active t
"*Non-nil to enable time-stamping of files.
Can be toggled by \\[time-stamp-toggle-active].
See also the variable time-stamp-warn-inactive.")
(defvar time-stamp-warn-inactive t
"*Non-nil to have time-stamp warn if time-stamp-active is nil.")
(defvar time-stamp-format "%02y/%02m/%02d %02H:%02M:%02S %u"
"*Template for the string inserted by the time-stamp function.
Value may be a string or a list. (Lists are supported only for
backward compatibility.) A string is used verbatim except for character
sequences beginning with %. See the documentation for the function
time-stamp-strftime for a list of %-escapes.
Each element of a list is called as a function and the results are
concatenated together separated by spaces. List 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: <95/01/18 10:20:51 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
(save-restriction
(widen)
(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")))
(if time-stamp-warn-inactive
(message "Did not time-stamp buffer.")))
;; be sure to return nil so can be used on write-file-hooks
nil)
;;;###autoload
(defun time-stamp-toggle-active (&optional arg)
"Toggle time-stamp-active, which enables time stamping of files.
With arg, turn time stamping on if and only if arg is positive."
(interactive "P")
(setq time-stamp-active
(if (null arg)
(not time-stamp-active)
(> (prefix-numeric-value arg) 0)))
(message "time-stamp is now %s." (if time-stamp-active "active" "off")))
(defun time-stamp-string ()
"Generate the new string to be inserted by \\[time-stamp]."
(if (stringp time-stamp-format)
(time-stamp-strftime time-stamp-format)
(time-stamp-fconcat time-stamp-format " "))) ;version 1 compatibility
(defun time-stamp-strftime (format &optional time)
"Uses a FORMAT to format date, time, file, and user information.
Optional second argument TIME will be used instead of the current time.
Characters in the format are copied literally except for %-directives:
%a weekday name: `Monday'. %A gives uppercase: `MONDAY'
%b month name: `January'. %B gives uppercase: `JANUARY'
%d day of month
%H 24-hour clock hour
%I 12-hour clock hour
%m month number
%M minute
%p `am' or `pm'. %P gives uppercase: `AM' or `PM'
%S seconds
%w day number of week, Sunday is 0
%y year: `1995'
%z time zone name: `est'. %Z gives uppercase: `EST'
Non-date items:
%% a literal percent character: `%'
%f file name without directory %F gives absolute pathname
%s system name
%u user's login name
%h mail host name
Decimal digits between the % and the type character specify the
field width. Strings are truncated on the right; numbers on the left.
A leading zero causes numbers to be zero-filled.
For example, to get the format used by the `date' command,
use \"%3a %3b %2d %02H:%02M:%02S %Z %y\""
(let ((time-string (cond ((stringp time)
time)
(time
(current-time-string time))
(t
(current-time-string))))
(fmt-len (length format))
(ind 0)
cur-char
(result "")
field-index
field-width
field-result)
(while (< ind fmt-len)
(setq cur-char (aref format ind))
(setq
result
(concat result
(cond
((and (eq cur-char ?%)
(< (1+ ind) fmt-len))
(setq field-index (1+ ind))
(while (progn
(setq ind (1+ ind))
(setq cur-char (aref format ind))
(and (<= ?0 cur-char) (>= ?9 cur-char))))
(setq field-width (substring format field-index ind))
(setq field-result
(cond
((eq cur-char ?%)
"%")
((or (eq cur-char ?a) ;weekday name
(eq cur-char ?A))
(let ((name
(aref time-stamp-weekday-full-names
(cdr (assoc (substring time-string 0 3)
time-stamp-weekday-numbers)))))
(if (eq cur-char ?a)
name
(upcase name))))
((or (eq cur-char ?b) ;month name
(eq cur-char ?B))
(let ((name
(aref time-stamp-month-full-names
(cdr (assoc (substring time-string 4 7)
time-stamp-month-numbers)))))
(if (eq cur-char ?b)
name
(upcase name))))
((eq cur-char ?d) ;day of month, 1-31
(string-to-int (substring time-string 8 10)))
((eq cur-char ?H) ;hour, 0-23
(string-to-int (substring time-string 11 13)))
((eq cur-char ?I) ;hour, 1-12
(let ((hour (string-to-int (substring time-string 11 13))))
(cond ((< hour 1)
(+ hour 12))
((> hour 12)
(- hour 12))
(t
hour))))
((eq cur-char ?m) ;month number, 1-12
(cdr (assoc (substring time-string 4 7)
time-stamp-month-numbers)))
((eq cur-char ?M) ;minute, 0-59
(string-to-int (substring time-string 14 16)))
((or (eq cur-char ?p) ;am or pm
(eq cur-char ?P))
(let ((name
(if (> 12 (string-to-int (substring time-string 11 13)))
"am"
"pm")))
(if (eq cur-char ?p)
name
(upcase name))))
((eq cur-char ?S) ;seconds, 00-60
(string-to-int (substring time-string 17 19)))
((eq cur-char ?w) ;weekday number, Sunday is 0
(cdr (assoc (substring time-string 0 3) time-stamp-weekday-numbers)))
((eq cur-char ?y) ;year
(string-to-int (substring time-string -4)))
((or (eq cur-char ?z) ;time zone
(eq cur-char ?Z))
(let ((name
(if (fboundp 'current-time-zone)
(car (cdr (current-time-zone time))))))
(or name (setq name ""))
(if (eq cur-char ?z)
(downcase name)
(upcase name))))
((eq cur-char ?f) ;buffer-file-name, base name only
(if buffer-file-name
(file-name-nondirectory buffer-file-name)
"(no file)"))
((eq cur-char ?F) ;buffer-file-name, full path
(or buffer-file-name
"(no file)"))
((eq cur-char ?s) ;system name
(system-name))
((eq cur-char ?u) ;user name
(user-login-name))
((eq cur-char ?h) ;mail host name
(time-stamp-mail-host-name))
))
(if (string-equal field-width "")
field-result
(let ((padded-result
(format (format "%%%s%c"
field-width
(if (numberp field-result) ?d ?s))
(or field-result ""))))
(let ((initial-length (length padded-result))
(desired-length (string-to-int field-width)))
(if (> initial-length desired-length)
;; truncate strings on right, numbers on left
(if (stringp field-result)
(substring padded-result 0 desired-length)
(substring padded-result (- desired-length)))
padded-result)))))
(t
(char-to-string cur-char)))))
(setq ind (1+ ind)))
result))
(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"])
(defconst time-stamp-weekday-numbers
'(("Sun" . 0) ("Mon" . 1) ("Tue" . 2) ("Wed" . 3)
("Thu" . 4) ("Fri" . 5) ("Sat" . 6))
"Alist of weekdays and their number.")
(defconst time-stamp-weekday-full-names
["Sunday" "Monday" "Tuesday" "Wednesday" "Thursday" "Friday" "Saturday"])
(defun time-stamp-mail-host-name ()
"Return the name of the host where the user receives mail.
This is the value of `mail-host-address' if bound and a string,
otherwise the value of `time-stamp-mail-host' (for versions of Emacs
before 19.29) otherwise the value of the function system-name.
This function may be usefully referenced by `time-stamp-format'."
(or (and (boundp 'mail-host-address)
(stringp mail-host-address)
mail-host-address)
(and (boundp 'time-stamp-mail-host) ;for backward compatibility
(stringp time-stamp-mail-host)
time-stamp-mail-host)
(system-name)))
;;; the rest of this file is for version 1 compatibility
(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))
;;; 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)
;;; 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
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