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6594deb0 ER |
1 | ;;; novice.el --- handling of disabled commands ("novice mode") for Emacs. |
2 | ||
8f1204db | 3 | ;; Copyright (C) 1985, 1986, 1987, 1994 Free Software Foundation, Inc. |
9750e079 | 4 | |
e5167999 | 5 | ;; Maintainer: FSF |
d7b4d18f | 6 | ;; Keywords: internal, help |
e5167999 | 7 | |
a2535589 JA |
8 | ;; This file is part of GNU Emacs. |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
e5167999 | 12 | ;; the Free Software Foundation; either version 2, or (at your option) |
a2535589 JA |
13 | ;; any later version. |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | ;; Boston, MA 02111-1307, USA. | |
a2535589 | 24 | |
edbd2f74 ER |
25 | ;;; Commentary: |
26 | ||
27 | ;; This mode provides a hook which is, by default, attached to various | |
28 | ;; putatively dangerous commands in a (probably futile) attempt to | |
29 | ;; prevent lusers from shooting themselves in the feet. | |
30 | ||
aae56ea7 | 31 | ;;; Code: |
a2535589 JA |
32 | |
33 | ;; This function is called (by autoloading) | |
34 | ;; to handle any disabled command. | |
35 | ;; The command is found in this-command | |
36 | ;; and the keys are returned by (this-command-keys). | |
37 | ||
7229064d | 38 | ;;;###autoload |
4442951c EN |
39 | (defvar disabled-command-hook 'disabled-command-hook |
40 | "Function to call to handle disabled commands. | |
41 | If nil, the feature is disabled, i.e., all commands work normally.") | |
73fa8346 | 42 | |
1c599895 | 43 | ;;;###autoload |
a2535589 JA |
44 | (defun disabled-command-hook (&rest ignore) |
45 | (let (char) | |
46 | (save-window-excursion | |
47 | (with-output-to-temp-buffer "*Help*" | |
be29d453 KH |
48 | (let ((keys (this-command-keys))) |
49 | (if (or (eq (aref keys 0) | |
50 | (if (stringp keys) | |
51 | (aref "\M-x" 0) | |
52 | ?\M-x)) | |
53 | (and (>= (length keys) 2) | |
54 | (eq (aref keys 0) meta-prefix-char) | |
55 | (eq (aref keys 1) ?x))) | |
56 | (princ "You have invoked the disabled command ") | |
57 | (princ "You have typed ") | |
58 | (princ (key-description keys)) | |
59 | (princ ", invoking disabled command "))) | |
a2535589 JA |
60 | (princ this-command) |
61 | (princ ":\n") | |
62 | ;; Print any special message saying why the command is disabled. | |
63 | (if (stringp (get this-command 'disabled)) | |
64 | (princ (get this-command 'disabled))) | |
a2535589 JA |
65 | ;; Keep only the first paragraph of the documentation. |
66 | (save-excursion | |
67 | (set-buffer "*Help*") | |
082f6929 RS |
68 | (goto-char (point-max)) |
69 | (save-excursion | |
70 | (princ (or (condition-case () | |
71 | (documentation this-command) | |
72 | (error nil)) | |
73 | "<< not documented >>"))) | |
a2535589 JA |
74 | (if (search-forward "\n\n" nil t) |
75 | (delete-region (1- (point)) (point-max)) | |
76 | (goto-char (point-max)))) | |
77 | (princ "\n\n") | |
78 | (princ "You can now type | |
4442951c | 79 | Space to try the command just this once, but leave it disabled, |
a2535589 | 80 | Y to try it and enable it (no questions if you use it again), |
4442951c | 81 | ! to try it and enable all commands in this session, or |
ea165072 KH |
82 | N to do nothing (command remains disabled).") |
83 | (save-excursion | |
84 | (set-buffer standard-output) | |
85 | (help-mode))) | |
4442951c | 86 | (message "Type y, n, ! or Space: ") |
a2535589 JA |
87 | (let ((cursor-in-echo-area t)) |
88 | (while (not (memq (setq char (downcase (read-char))) | |
4442951c | 89 | '(?! ? ?y ?n))) |
a2535589 | 90 | (ding) |
4442951c EN |
91 | (message "Please type y, n, ! or Space: ")))) |
92 | (if (= char ?!) | |
93 | (setq disabled-command-hook nil)) | |
a2535589 | 94 | (if (= char ?y) |
7435bd25 RS |
95 | (if (and user-init-file |
96 | (not (string= "" user-init-file)) | |
97 | (y-or-n-p "Enable command for future editing sessions also? ")) | |
a2535589 JA |
98 | (enable-command this-command) |
99 | (put this-command 'disabled nil))) | |
100 | (if (/= char ?n) | |
101 | (call-interactively this-command)))) | |
102 | ||
7229064d | 103 | ;;;###autoload |
a2535589 JA |
104 | (defun enable-command (command) |
105 | "Allow COMMAND to be executed without special confirmation from now on. | |
106 | The user's .emacs file is altered so that this will apply | |
107 | to future sessions." | |
108 | (interactive "CEnable command: ") | |
109 | (put command 'disabled nil) | |
110 | (save-excursion | |
7435bd25 | 111 | (set-buffer (find-file-noselect |
bb79850e | 112 | (substitute-in-file-name user-init-file))) |
a2535589 JA |
113 | (goto-char (point-min)) |
114 | (if (search-forward (concat "(put '" (symbol-name command) " ") nil t) | |
115 | (delete-region | |
116 | (progn (beginning-of-line) (point)) | |
020c97d2 RS |
117 | (progn (forward-line 1) (point)))) |
118 | ;; Explicitly enable, in case this command is disabled by default | |
119 | ;; or in case the code we deleted was actually a comment. | |
120 | (goto-char (point-max)) | |
121 | (insert "\n(put '" (symbol-name command) " 'disabled nil)\n") | |
a2535589 JA |
122 | (save-buffer))) |
123 | ||
7229064d | 124 | ;;;###autoload |
a2535589 JA |
125 | (defun disable-command (command) |
126 | "Require special confirmation to execute COMMAND from now on. | |
127 | The user's .emacs file is altered so that this will apply | |
128 | to future sessions." | |
129 | (interactive "CDisable command: ") | |
5b817cf2 RS |
130 | (if (not (commandp command)) |
131 | (error "Invalid command name `%s'" command)) | |
a2535589 JA |
132 | (put command 'disabled t) |
133 | (save-excursion | |
7435bd25 | 134 | (set-buffer (find-file-noselect |
bb79850e | 135 | (substitute-in-file-name user-init-file))) |
a2535589 JA |
136 | (goto-char (point-min)) |
137 | (if (search-forward (concat "(put '" (symbol-name command) " ") nil t) | |
138 | (delete-region | |
139 | (progn (beginning-of-line) (point)) | |
140 | (progn (forward-line 1) (point)))) | |
141 | (goto-char (point-max)) | |
020c97d2 | 142 | (insert "\n(put '" (symbol-name command) " 'disabled t)\n") |
a2535589 JA |
143 | (save-buffer))) |
144 | ||
896546cd RS |
145 | (provide 'novice) |
146 | ||
6594deb0 | 147 | ;;; novice.el ends here |