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281 lines
10 KiB
EmacsLisp
281 lines
10 KiB
EmacsLisp
;;; time-stamp.el --- Maintain last change time stamps in files edited by Emacs
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;;; Copyright 1989, 1993, 1994 Free Software Foundation, Inc.
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;; Maintainer: Stephen Gildea <gildea@lcs.mit.edu>
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;; Time-stamp: <94/02/14 15:02:07 gildea>
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;; Keywords: tools
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;; This file is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; This file is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary:
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;;; If you put a time stamp template anywhere in the first 8 lines of a file,
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;;; it can be updated every time you save the file. See the top of
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;;; time-stamp.el for a sample. The template looks like one of the following:
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;;; Time-stamp: <>
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;;; Time-stamp: " "
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;;; The time stamp is written between the brackets or quotes, resulting in
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;;; Time-stamp: <93/06/18 10:26:51 gildea>
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;;; Here is an example which puts the file name and time stamp in the binary:
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;;; static char *time_stamp = "sdmain.c Time-stamp: <>";
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;;; To activate automatic time stamping, add this code to your .emacs file:
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;;;
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;;; (if (not (memq 'time-stamp write-file-hooks))
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;;; (setq write-file-hooks
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;;; (cons 'time-stamp write-file-hooks)))
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;;;
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;;; In Emacs 18 you will also need
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;;; (autoload 'time-stamp "time-stamp" "Update the time stamp in a buffer." t)
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;;; Change Log:
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;;; Originally based on the 19 Dec 88 version of
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;;; date.el by John Sturdy <mcvax!harlqn.co.uk!jcgs@uunet.uu.net>
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;;; Code:
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(defvar time-stamp-active t
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"*Non-nil to enable time-stamping of files. See the function time-stamp.")
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(defvar time-stamp-format
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'(time-stamp-yy/mm/dd time-stamp-hh:mm:ss user-login-name)
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"*A list of functions to call to generate the time stamp string.
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Each element of the list is called as a function and the results are
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concatenated together separated by spaces. Elements may also be strings,
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which are included verbatim. Spaces are not inserted around literal strings.")
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;;; Do not change time-stamp-line-limit, time-stamp-start, or
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;;; time-stamp-end in your .emacs or you will be incompatible
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;;; with other people's files! If you must change them,
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;;; do so only in the local variables section of the file itself.
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(defvar time-stamp-line-limit 8 ;Do not change!
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"Number of lines at the beginning of a file that are searched.
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The patterns `time-stamp-start' and `time-stamp-end' must be found on one
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of the first `time-stamp-line-limit' lines of the file for the file to
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be time-stamped by \\[time-stamp].
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Do not change `time-stamp-line-limit', `time-stamp-start', or
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`time-stamp-end' for yourself or you will be incompatible
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with other people's files! If you must change them for some application,
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do so in the local variables section of the time-stamped file itself.")
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(defvar time-stamp-start "Time-stamp:[ \t]+\\\\?[\"<]+" ;Do not change!
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"Regexp after which the time stamp is written by \\[time-stamp].
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See also the variables `time-stamp-end' and `time-stamp-line-limit'.
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Do not change `time-stamp-line-limit', `time-stamp-start', or
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`time-stamp-end' for yourself or you will be incompatible
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with other people's files! If you must change them for some application,
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do so in the local variables section of the time-stamped file itself.")
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(defvar time-stamp-end "\\\\?[\">]" ;Do not change!
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"Regexp marking the text after the time stamp.
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\\[time-stamp] deletes the text between the first match of `time-stamp-start'
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and the following match of `time-stamp-end' on the same line,
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then writes the time stamp specified by `time-stamp-format' between them.
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Do not change `time-stamp-line-limit', `time-stamp-start', or
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`time-stamp-end' for yourself or you will be incompatible
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with other people's files! If you must change them for some application,
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do so in the local variables section of the time-stamped file itself.")
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;;;###autoload
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(defun time-stamp ()
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"Update the time stamp string in the buffer.
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If you put a time stamp template anywhere in the first 8 lines of a file,
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it can be updated every time you save the file. See the top of
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`time-stamp.el' for a sample. The template looks like one of the following:
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Time-stamp: <>
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Time-stamp: \" \"
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The time stamp is written between the brackets or quotes, resulting in
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Time-stamp: <93/06/18 10:26:51 gildea>
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Only does its thing if the variable time-stamp-active is non-nil.
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Typically used on write-file-hooks for automatic time-stamping.
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The format of the time stamp is determined by the variable time-stamp-format.
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The variables time-stamp-line-limit, time-stamp-start, and time-stamp-end
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control finding the template."
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(interactive)
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(if time-stamp-active
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(let ((case-fold-search nil))
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(if (and (stringp time-stamp-start)
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(stringp time-stamp-end))
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(save-excursion
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(goto-char (point-min))
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(if (re-search-forward time-stamp-start
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(save-excursion
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(forward-line time-stamp-line-limit)
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(point))
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t)
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(let ((start (point)))
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(if (re-search-forward time-stamp-end
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(save-excursion (end-of-line) (point))
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t)
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(let ((end (match-beginning 0)))
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(delete-region start end)
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(goto-char start)
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(insert (time-stamp-string))
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(setq end (point))
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;; remove any tabs used to format the time stamp
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(goto-char start)
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(if (search-forward "\t" end t)
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(untabify start end)))))))
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;; don't signal an error in a write-file-hook
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(message "time-stamp-start or time-stamp-end is not a string"))))
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;; be sure to return nil so can be used on write-file-hooks
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nil)
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(defun time-stamp-string ()
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"Generate the new string to be inserted by \\[time-stamp]."
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(time-stamp-fconcat time-stamp-format " "))
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(defun time-stamp-fconcat (list sep)
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"Similar to (mapconcat 'funcall LIST SEP) but LIST allows literals.
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If an element of LIST is a symbol, it is funcalled to get the string to use;
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the separator SEP is used between two strings obtained by funcalling a
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symbol. Otherwise the element itself is inserted; no separator is used
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around literals."
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(let ((return-string "")
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(insert-sep-p nil))
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(while list
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(cond ((symbolp (car list))
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(if insert-sep-p
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(setq return-string (concat return-string sep)))
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(setq return-string (concat return-string (funcall (car list))))
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(setq insert-sep-p t))
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(t
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(setq return-string (concat return-string (car list)))
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(setq insert-sep-p nil)))
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(setq list (cdr list)))
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return-string))
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(defconst time-stamp-month-numbers
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'(("Jan" . 1) ("Feb" . 2) ("Mar" . 3) ("Apr" . 4) ("May" . 5) ("Jun" . 6)
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("Jul" . 7) ("Aug" . 8) ("Sep" . 9) ("Oct" . 10) ("Nov" . 11) ("Dec" . 12))
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"Alist of months and their number.")
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(defconst time-stamp-month-full-names
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["(zero)" "January" "February" "March" "April" "May" "June"
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"July" "August" "September" "October" "November" "December"])
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(defvar time-stamp-mail-host nil
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"*Name of the host where the user receives mail.
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See the function `time-stamp-mail-host-name'.")
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;;; Some useful functions to use in time-stamp-format
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;;; Could generate most of a message-id with
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;;; '(time-stamp-yymmdd "" time-stamp-hhmm "@" time-stamp-mail-host-name)
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(defun time-stamp-mail-host-name ()
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"Return the name of the host where the user receives mail.
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This is the value of `time-stamp-mail-host' if bound and a string,
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otherwise the value of the function system-name.
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This function may be usefully referenced by `time-stamp-format'."
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(or (and (boundp 'time-stamp-mail-host)
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(stringp time-stamp-mail-host)
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time-stamp-mail-host)
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(system-name)))
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;;; pretty form, suitable for a title page
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(defun time-stamp-month-dd-yyyy ()
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"Return the current date as a string in \"Month DD, YYYY\" form."
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(let ((date (current-time-string)))
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(format "%s %d, %s"
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(aref time-stamp-month-full-names
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(cdr (assoc (substring date 4 7) time-stamp-month-numbers)))
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(string-to-int (substring date 8 10))
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(substring date -4))))
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;;; same as __DATE__ in ANSI C
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(defun time-stamp-mon-dd-yyyy ()
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"Return the current date as a string in \"Mon DD YYYY\" form.
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The first character of DD is space if the value is less than 10."
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(let ((date (current-time-string)))
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(format "%s %2d %s"
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(substring date 4 7)
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(string-to-int (substring date 8 10))
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(substring date -4))))
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;;; RFC 822 date
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(defun time-stamp-dd-mon-yy ()
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"Return the current date as a string in \"DD Mon YY\" form."
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(let ((date (current-time-string)))
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(format "%02d %s %s"
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(string-to-int (substring date 8 10))
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(substring date 4 7)
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(substring date -2))))
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;;; RCS 3 date
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(defun time-stamp-yy/mm/dd ()
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"Return the current date as a string in \"YY/MM/DD\" form."
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(let ((date (current-time-string)))
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(format "%s/%02d/%02d"
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(substring date -2)
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(cdr (assoc (substring date 4 7) time-stamp-month-numbers))
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(string-to-int (substring date 8 10)))))
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;;; RCS 5 date
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(defun time-stamp-yyyy/mm/dd ()
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"Return the current date as a string in \"YYYY/MM/DD\" form."
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(let ((date (current-time-string)))
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(format "%s/%02d/%02d"
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(substring date -4)
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(cdr (assoc (substring date 4 7) time-stamp-month-numbers))
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(string-to-int (substring date 8 10)))))
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;;; ISO 8601 date
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(defun time-stamp-yyyy-mm-dd ()
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"Return the current date as a string in \"YYYY-MM-DD\" form."
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(let ((date (current-time-string)))
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(format "%s-%02d-%02d"
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(substring date -4)
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(cdr (assoc (substring date 4 7) time-stamp-month-numbers))
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(string-to-int (substring date 8 10)))))
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(defun time-stamp-yymmdd ()
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"Return the current date as a string in \"YYMMDD\" form."
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(let ((date (current-time-string)))
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(format "%s%02d%02d"
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(substring date -2)
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(cdr (assoc (substring date 4 7) time-stamp-month-numbers))
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(string-to-int (substring date 8 10)))))
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(defun time-stamp-hh:mm:ss ()
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"Return the current time as a string in \"HH:MM:SS\" form."
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(substring (current-time-string) 11 19))
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(defun time-stamp-hhmm ()
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"Return the current time as a string in \"HHMM\" form."
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(let ((date (current-time-string)))
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(concat (substring date 11 13)
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(substring date 14 16))))
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(provide 'time-stamp)
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;;; time-stamp.el ends here
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