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1 ;;; novice.el --- handling of disabled commands ("novice mode") for XEmacs.
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2
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3 ;; Copyright (C) 1985, 1986, 1987, 1992, 1993, 1994
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4 ;; Free Software Foundation, Inc.
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5
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6 ;; Maintainer: FSF
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7 ;; Keywords: internal, help
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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23 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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24
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25 ;;; Synched up with: FSF 19.30.
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26
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27 ;;; Commentary:
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28
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29 ;; This mode provides a hook which is, by default, attached to various
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30 ;; putatively dangerous commands in a (probably futile) attempt to
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31 ;; prevent lusers from shooting themselves in the feet.
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32
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33 ;;; Code:
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34
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35 ;; This function is called (by autoloading)
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36 ;; to handle any disabled command.
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37 ;; The command is found in this-command
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38 ;; and the keys are returned by (this-command-keys).
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39
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40 ;;;###autoload
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41 ;(setq disabled-command-hook 'disabled-command-hook)
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42
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43 ;;;###autoload
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44 (defun disabled-command-hook (&rest ignore)
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45 (let (char)
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46 (save-window-excursion
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47 (with-output-to-temp-buffer "*Help*"
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48 (let ((keys (this-command-keys)))
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49 (if (or (equal keys []) ;XEmacs kludge
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50 (eq (event-to-character (aref keys 0)) ?\r))
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51 (princ "You have invoked the disabled command ")
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52 (princ "You have typed ")
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53 (princ (key-description keys))
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54 (princ ", invoking disabled command ")))
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55 (princ this-command)
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56 (princ ":\n")
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57 ;; Print any special message saying why the command is disabled.
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58 (if (stringp (get this-command 'disabled))
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59 (princ (get this-command 'disabled)))
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60 (princ (or (condition-case ()
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61 (documentation this-command)
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62 (error nil))
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63 "<< not documented >>"))
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64 ;; Keep only the first paragraph of the documentation.
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65 (save-excursion
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66 (set-buffer "*Help*")
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67 (goto-char (point-min))
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68 (if (search-forward "\n\n" nil t)
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69 (delete-region (1- (point)) (point-max))
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70 (goto-char (point-max))))
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71 (princ "\n\n")
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72 (princ "You can now type
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73 Space to try the command just this once,
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74 but leave it disabled,
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75 Y to try it and enable it (no questions if you use it again),
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76 N to do nothing (command remains disabled).")
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77 (save-excursion
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78 (set-buffer standard-output)
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79 (help-mode)))
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80 (message "Type y, n or Space: ")
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81 (let ((cursor-in-echo-area t)
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82 (inhibit-quit t)
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83 event)
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84 (while (null char)
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85 (if (progn
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86 (setq event (next-command-event))
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87 (prog1
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88 (or quit-flag (eq 'keyboard-quit (key-binding event)))
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89 (setq quit-flag nil)))
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90 (progn
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91 (setq quit-flag nil)
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92 (signal 'quit '())))
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93 (let* ((key (and (key-press-event-p event) (event-key event)))
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94 (rchar (and key (event-to-character event))))
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95 (if rchar (setq rchar (downcase rchar)))
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96 (cond ((eq rchar ?y)
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97 (setq char rchar))
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98 ((eq rchar ?n)
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99 (setq char rchar))
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100 ((eq rchar ? )
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101 (setq char rchar))
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102 (t
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103 (ding nil 'y-or-n-p)
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104 (discard-input)
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105 (message "Please type y, n or Space: ")))))))
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106 (message nil)
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107 (if (= char ?y)
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108 (if (and user-init-file
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109 (not (string= "" user-init-file))
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110 (y-or-n-p "Enable command for future editing sessions also? "))
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111 (enable-command this-command)
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112 (put this-command 'disabled nil)))
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113 (if (/= char ?n)
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114 (call-interactively this-command))))
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115
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116 ;;;###autoload
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117 (defun enable-command (command)
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118 "Allow COMMAND to be executed without special confirmation from now on.
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119 The user's .emacs file is altered so that this will apply
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120 to future sessions."
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121 (interactive "CEnable command: ")
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122 (put command 'disabled nil)
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123 (save-excursion
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124 (set-buffer (find-file-noselect
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125 (substitute-in-file-name user-init-file)))
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126 (goto-char (point-min))
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127 (if (search-forward (concat "(put '" (symbol-name command) " ") nil t)
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128 (delete-region
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129 (progn (beginning-of-line) (point))
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130 (progn (forward-line 1) (point))))
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131 ;; Explicitly enable, in case this command is disabled by default
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132 ;; or in case the code we deleted was actually a comment.
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133 (goto-char (point-max))
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134 (insert "\n(put '" (symbol-name command) " 'disabled nil)\n")
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135 (save-buffer)))
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136
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137 ;;;###autoload
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138 (defun disable-command (command)
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139 "Require special confirmation to execute COMMAND from now on.
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140 The user's .emacs file is altered so that this will apply
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141 to future sessions."
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142 (interactive "CDisable command: ")
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143 (if (not (commandp command))
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144 (error "Invalid command name `%s'" command))
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145 (put command 'disabled t)
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146 (save-excursion
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147 (set-buffer (find-file-noselect
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148 (substitute-in-file-name user-init-file)))
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149 (goto-char (point-min))
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150 (if (search-forward (concat "(put '" (symbol-name command) " ") nil t)
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151 (delete-region
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152 (progn (beginning-of-line) (point))
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153 (progn (forward-line 1) (point))))
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154 (goto-char (point-max))
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155 (insert "\n(put '" (symbol-name command) " 'disabled t)\n")
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156 (save-buffer)))
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157
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158 ;;; novice.el ends here
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