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