--- /dev/null
+;;; time-stamp.el --- Maintain last change time stamps in files edited by Emacs
+;;; Copyright 1989, 1993, 1994 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
+
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