;; #(@) crontab.el - An Emacs function to assist in editing crontab entries
;; Last edited: Fri Aug 18 12:19:22 1989 by chris (Christopher D. Orr) on lxn
;; Version: 1.00 - Initial Creation of mode
;; 1.01 - Added crontab-use-local-file variable
;; 1.02 - Reworked most of the library to be cleaner.
;; 1.03 - Now deletes blank lines in crontab entry
;; Copyright (C) 1989 Christopher D. Orr (email@example.com)
;; This file is part of XEmacs.
;; XEmacs 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.
;; XEmacs 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 XEmacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Synched up with: Not in FSF.
;; Place the following line in your ~/.emacs file:
;; (autoload 'crontab-edit "crontab"
;; "Function to allow the easy editing of crontab files." t)
;;; Local Variables. Define these to your liking.
(defgroup crontab nil
"Assist in editing crontab files."
(defcustom crontab-filename "~/.crontab"
"*The name of the file to store the User's Crontab."
(defcustom crontab-directory "/usr/spool/cron/crontabs"
"*The name of the directory in which crontab stores it's entries."
(defcustom crontab-use-local-file nil
"*Non-nil means use file stored in User's Home directory, if it exists.
Otherwise, always ask crontab for the current entry (maybe)."
(defcustom crontab-delete-blank-lines t
"*Non-nil means to delete any blank lines in the crontab file on save."
;;; Interactive Function called to edit a Crontab Entry. It is called
;;; instead of crontab-edit to allow for future automatic entries.
(defun crontab-edit ()
"Function to allow the easy editing of crontab files."
;;; Function to retrieve the crontab entry. The Function will
;;; retrieve the file (crontab-filename) first. If the file does not
;;; exists, a crontab -l command will be executed.
(defun crontab-get ()
"Retrieve a crontab file either using crontab -l or from the variable
(message "Retrieving Crontab ... ")
(switch-to-buffer (create-file-buffer crontab-filename))
(if (file-exists-p crontab-filename)
(if (file-newer-than-file-p (concat crontab-directory "/" (user-login-name)) (expand-file-name crontab-filename))
(if (yes-or-no-p "Cron has a more recent copy of your crontab. Use it ? ")
(call-process "crontab" nil t t "-l")
(call-process "crontab" nil t t "-l")))
(call-process "crontab" nil t t "-l")))
;; What if crontab returns a fatal ?????? Can't we check the errorlevel ????
(if (search-forward-regexp "crontab:\\|no crontab for" nil t nil)
(setq buffer-file-name crontab-filename)
(or (memq 'crontab-save write-file-hooks)
(reverse (cons 'crontab-save (reverse write-file-hooks)))))
(message "Save file normally when finished to update cron."))
;;; This function is called whenever a save-file operation is
;;; performed in the crontab buffer. It saves the crontab to the file
;;; name (crontab-filename) and then removes the crontab buffer.
(defun crontab-save ()
"Submit the edited crontab to the cron daemon for processing."
(while (not (eobp))
(setq write-file-hooks nil)
(let ((crontab-buffer (buffer-name)))
;; What if the call-process to crontab fails ??? Can we check for a fatal ???
;; (call-process "crontab" nil nil nil (expand-file-name crontab-filename))
(shell-command (concat "crontab " (expand-file-name crontab-filename)))
(message (concat "Crontab saved as " crontab-filename " and submitted to cron."))
;; fixed by Lynn D. Newton - 03/17/95
(defun crontab-initialize ()
"Create a default Crontab file if one does not exist or is empty.
If the function (time-stamp) is available, the last modification time will
be stamped to the file."
(insert "# Cron Table Entry for ")
(insert " (")
(insert ")\n# Last Edited: \n")
(insert "# min hr day mon wday(0=sun) cmd\n")
;;; Watch out for the signature :-)