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+;;; 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: <93/06/20 17:36:04 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:
+;;;
+;;; (autoload 'time-stamp "time-stamp" "Update the time stamp in a buffer." t)
+;;; (if (not (memq 'time-stamp write-file-hooks))
+;;;     (setq write-file-hooks
+;;;           (cons 'time-stamp write-file-hooks)))
+
+;;; 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!  See comment above.
+  "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.")
+
+(defvar time-stamp-start "Time-stamp: \\\\?[\"<]+"    ;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!  See comment above.
+  "Regexp marking the text after the time stamp.
+\\[time-stamp] deletes the text between the first match of  time-stamp-start
+\(which see) and the following match of  time-stamp-end  on the same line,
+then writes the time stamp specified by  time-stamp-format  between them.")
+
+(defun time-stamp ()
+  "Update the time stamp string in the buffer.
+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 first  time-stamp-line-limit  lines of the
+buffer (normally 8) are searched for the time stamp template,
+and if it is found, a new time stamp is written into it."
+  (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 can have 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))
+  "Assoc list 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
+;;; '(yymmdd "" hhmm "@" 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."
+  (or (and (boundp 'time-stamp-mail-host)
+	   (stringp time-stamp-mail-host)
+	   time-stamp-mail-host)
+      (system-name)))
+
+(defun time-stamp-current-year ()
+  "Return the current year as a four-character string."
+  (substring (current-time-string) -4))
+
+;;; 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 %02d, %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)))))
+
+(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-dd/mm/yy ()
+  "Return the current date as a string in \"dd/mm/yy\" form."
+  (let ((date (current-time-string)))
+    (format "%02d/%02d/%s"
+	    (string-to-int (substring date 8 10))
+	    (cdr (assoc (substring date 4 7) time-stamp-month-numbers))
+	    (substring date -2))))
+
+(defun time-stamp-mm/dd/yy ()
+  "Return the current date as a string in \"mm/dd/yy\" form."
+  (let ((date (current-time-string)))
+    (format "%02d/%02d/%s"
+	    (cdr (assoc (substring date 4 7) time-stamp-month-numbers))
+	    (string-to-int (substring date 8 10))
+	    (substring date -2))))
+
+(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-hh:mm ()
+  "Return the current time as a string in \"hh:mm\" form."
+  (substring (current-time-string) 11 16))
+
+(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