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comparison lisp/utils/crontab.el @ 0:376386a54a3c r19-14

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date Mon, 13 Aug 2007 08:45:50 +0200
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1 ;; #(@) crontab.el - An Emacs function to assist in editing crontab entries
2 ;; Last edited: Fri Aug 18 12:19:22 1989 by chris (Christopher D. Orr) on lxn
3 ;;
4 ;; Version: 1.00 - Initial Creation of mode
5 ;; 1.01 - Added crontab-use-local-file variable
6 ;; 1.02 - Reworked most of the library to be cleaner.
7 ;; 1.03 - Now deletes blank lines in crontab entry
8
9 ;; Copyright (C) 1989 Christopher D. Orr (chris@lxn.eds.com)
10
11 ;; This file is part of XEmacs.
12
13 ;; XEmacs is free software; you can redistribute it and/or modify it
14 ;; under the terms of the GNU General Public License as published by
15 ;; the Free Software Foundation; either version 2, or (at your option)
16 ;; any later version.
17
18 ;; XEmacs is distributed in the hope that it will be useful, but
19 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 ;; General Public License for more details.
22
23 ;; You should have received a copy of the GNU General Public License
24 ;; along with XEmacs; see the file COPYING. If not, write to the Free
25 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
26
27 ;;; Synched up with: Not in FSF.
28
29 ;;
30 ;; TODO:
31 ;;
32
33 ;; Place the following line in your ~/.emacs file:
34 ;; (autoload 'crontab-edit "crontab"
35 ;; "Function to allow the easy editing of crontab files." t)
36 ;;
37
38 (provide 'crontab-edit)
39
40 ;;; Local Variables. Define these to your liking.
41
42 (defvar crontab-filename "~/.crontab"
43 "*The name of the file to store the User's Crontab.")
44
45 (defvar crontab-directory "/usr/spool/cron/crontabs"
46 "*The name of the directory in which crontab stores it's entries.")
47
48 (defvar crontab-use-local-file nil
49 "*Non-nil means use file stored in User's Home directory, if it exists.
50 Otherwise, always ask crontab for the current entry (maybe).")
51
52
53 ;;; Interactive Function called to edit a Crontab Entry. It is called
54 ;;; instead of crontab-edit to allow for future automatic entries.
55
56 (defun crontab-edit ()
57 "Function to allow the easy editing of crontab files."
58
59 (interactive)
60 (crontab-get))
61
62
63 ;;; Function to retrieve the crontab entry. The Function will
64 ;;; retrieve the file (crontab-filename) first. If the file does not
65 ;;; exists, a crontab -l command will be executed.
66
67 (defun crontab-get ()
68 "Retrieve a crontab file either using crontab -l or from the variable
69 crontab-filename"
70 (message "Retrieving Crontab ... ")
71 (switch-to-buffer (create-file-buffer crontab-filename))
72 (erase-buffer)
73
74 (if (file-exists-p crontab-filename)
75 (if (file-newer-than-file-p (concat crontab-directory "/" (user-login-name)) (expand-file-name crontab-filename))
76 (if (yes-or-no-p "Cron has a more recent copy of your crontab. Use it ? ")
77 (call-process "crontab" nil t t "-l")
78 (insert-file crontab-filename))
79 (if crontab-use-local-file
80 (insert-file crontab-filename)
81 (call-process "crontab" nil t t "-l")))
82 (if crontab-use-local-file
83 (insert-file crontab-filename)
84 (call-process "crontab" nil t t "-l")))
85
86 ;; What if crontab returns a fatal ?????? Can't we check the errorlevel ????
87 (goto-char (point-min))
88 (if (search-forward "crontab:" nil t nil)
89 (erase-buffer))
90 (if (eobp)
91 (crontab-initialize))
92 (goto-line 6)
93 (setq buffer-file-name crontab-filename)
94 (set-buffer-modified-p nil)
95 (make-variable-buffer-local 'write-file-hooks)
96 (or (memq 'crontab-save write-file-hooks)
97 (setq write-file-hooks
98 (reverse (cons 'crontab-save (reverse write-file-hooks)))))
99 (message "Save file normally when finished to update cron."))
100
101
102 ;;; This function is called whenever a save-file operation is
103 ;;; performed in the crontab buffer. It saves the crontab to the file
104 ;;; name (crontab-filename) and then removes the crontab buffer.
105
106 (defun crontab-save ()
107 "Submit the edited crontab to the cron deamon for processing"
108
109 (goto-char (point-min))
110 (while (not (eobp))
111 (delete-blank-lines)
112 (forward-line 1))
113 (redraw-display)
114
115 (setq write-file-hooks nil)
116 (let ((crontab-buffer (buffer-name)))
117 (basic-save-buffer)
118
119 ;; What if the call-process to crontab fails ??? Can we check for a fatal ???
120 ;; (call-process "crontab" nil nil nil (expand-file-name crontab-filename))
121 (shell-command (concat "crontab " (expand-file-name crontab-filename)))
122
123 (switch-to-buffer (other-buffer))
124 (kill-buffer crontab-buffer))
125 (message (concat "Crontab saved as " crontab-filename " and submitted to cron."))
126 ;; fixed by Lynn D. Newton - 03/17/95
127 "")
128 ;; OLD
129 ;; nil)
130
131 (defun crontab-initialize ()
132 "Create a default Crontab file if one does not exist or is empty.
133 If the function (time-stamp) is available, the last modification time will
134 be stamped to the file."
135
136 (insert "# Cron Table Entry for ")
137 (insert (user-login-name))
138 (insert " (")
139 (insert (user-full-name))
140 (insert ")\n# Last Edited: \n")
141 (insert "#\n")
142 (insert "# min hr day mon wday(0=sun) cmd\n")
143 (insert "#\n"))
144
145 ;;; Watch out for the signature :-)