Commit | Line | Data |
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55535639 | 1 | ;;; novice.el --- handling of disabled commands ("novice mode") for Emacs |
6594deb0 | 2 | |
0d30b337 | 3 | ;; Copyright (C) 1985, 1986, 1987, 1994, 2002, 2003, 2004, |
aaef169d | 4 | ;; 2005, 2006 Free Software Foundation, Inc. |
9750e079 | 5 | |
e5167999 | 6 | ;; Maintainer: FSF |
d7b4d18f | 7 | ;; Keywords: internal, help |
e5167999 | 8 | |
a2535589 JA |
9 | ;; This file is part of GNU Emacs. |
10 | ||
11 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
12 | ;; it under the terms of the GNU General Public License as published by | |
e5167999 | 13 | ;; the Free Software Foundation; either version 2, or (at your option) |
a2535589 JA |
14 | ;; any later version. |
15 | ||
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
b578f267 | 22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
086add15 LK |
23 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
24 | ;; Boston, MA 02110-1301, USA. | |
a2535589 | 25 | |
edbd2f74 ER |
26 | ;;; Commentary: |
27 | ||
28 | ;; This mode provides a hook which is, by default, attached to various | |
29 | ;; putatively dangerous commands in a (probably futile) attempt to | |
30 | ;; prevent lusers from shooting themselves in the feet. | |
31 | ||
aae56ea7 | 32 | ;;; Code: |
a2535589 JA |
33 | |
34 | ;; This function is called (by autoloading) | |
35 | ;; to handle any disabled command. | |
36 | ;; The command is found in this-command | |
37 | ;; and the keys are returned by (this-command-keys). | |
38 | ||
7229064d | 39 | ;;;###autoload |
939a7761 | 40 | (defvar disabled-command-function 'disabled-command-function |
4442951c EN |
41 | "Function to call to handle disabled commands. |
42 | If nil, the feature is disabled, i.e., all commands work normally.") | |
73fa8346 | 43 | |
52e3545b | 44 | ;;;###autoload |
6d9c9ad9 | 45 | (define-obsolete-variable-alias 'disabled-command-hook 'disabled-command-function "22.1") |
939a7761 | 46 | |
1c599895 | 47 | ;;;###autoload |
939a7761 | 48 | (defun disabled-command-function (&rest ignore) |
a2535589 JA |
49 | (let (char) |
50 | (save-window-excursion | |
72287c23 | 51 | (with-output-to-temp-buffer "*Disabled Command*" |
be29d453 KH |
52 | (let ((keys (this-command-keys))) |
53 | (if (or (eq (aref keys 0) | |
54 | (if (stringp keys) | |
55 | (aref "\M-x" 0) | |
56 | ?\M-x)) | |
57 | (and (>= (length keys) 2) | |
58 | (eq (aref keys 0) meta-prefix-char) | |
59 | (eq (aref keys 1) ?x))) | |
606e6135 RS |
60 | (princ (format "You have invoked the disabled command %s.\n" |
61 | (symbol-name this-command))) | |
62 | (princ (format "You have typed %s, invoking disabled command %s.\n" | |
63 | (key-description keys) (symbol-name this-command))))) | |
a2535589 JA |
64 | ;; Print any special message saying why the command is disabled. |
65 | (if (stringp (get this-command 'disabled)) | |
606e6135 RS |
66 | (princ (get this-command 'disabled)) |
67 | (princ "It is disabled because new users often find it confusing.\n") | |
68 | (princ "Here's the first part of its description:\n\n") | |
69 | ;; Keep only the first paragraph of the documentation. | |
72287c23 | 70 | (with-current-buffer "*Disabled Command*" |
606e6135 RS |
71 | (goto-char (point-max)) |
72 | (let ((start (point))) | |
73 | (save-excursion | |
74 | (princ (or (condition-case () | |
75 | (documentation this-command) | |
76 | (error nil)) | |
77 | "<< not documented >>"))) | |
78 | (if (search-forward "\n\n" nil t) | |
79 | (delete-region (match-beginning 0) (point-max))) | |
80 | (goto-char (point-max)) | |
81 | (indent-rigidly start (point) 3)))) | |
82 | (princ "\n\nDo you want to use this command anyway?\n\n") | |
a2535589 | 83 | (princ "You can now type |
eb4cb84f PJ |
84 | y to try it and enable it (no questions if you use it again). |
85 | n to cancel--don't try the command, and it remains disabled. | |
606e6135 RS |
86 | SPC to try the command just this once, but leave it disabled. |
87 | ! to try it, and enable all disabled commands for this session only.") | |
ea165072 KH |
88 | (save-excursion |
89 | (set-buffer standard-output) | |
90 | (help-mode))) | |
eb4cb84f | 91 | (message "Type y, n, ! or SPC (the space bar): ") |
a2535589 | 92 | (let ((cursor-in-echo-area t)) |
72287c23 RS |
93 | (while (progn (setq char (read-event)) |
94 | (or (not (numberp char)) | |
95 | (not (memq (downcase char) | |
96 | '(?! ?y ?n ?\ ?\C-g))))) | |
a2535589 | 97 | (ding) |
eb4cb84f | 98 | (message "Please type y, n, ! or SPC (the space bar): ")))) |
72287c23 RS |
99 | (setq char (downcase char)) |
100 | (if (= char ?\C-g) | |
101 | (setq quit-flag t)) | |
4442951c | 102 | (if (= char ?!) |
939a7761 | 103 | (setq disabled-command-function nil)) |
a2535589 | 104 | (if (= char ?y) |
7435bd25 RS |
105 | (if (and user-init-file |
106 | (not (string= "" user-init-file)) | |
107 | (y-or-n-p "Enable command for future editing sessions also? ")) | |
a2535589 JA |
108 | (enable-command this-command) |
109 | (put this-command 'disabled nil))) | |
110 | (if (/= char ?n) | |
111 | (call-interactively this-command)))) | |
112 | ||
7229064d | 113 | ;;;###autoload |
a2535589 JA |
114 | (defun enable-command (command) |
115 | "Allow COMMAND to be executed without special confirmation from now on. | |
7a4d608f LT |
116 | COMMAND must be a symbol. |
117 | This command alters the user's .emacs file so that this will apply | |
a2535589 JA |
118 | to future sessions." |
119 | (interactive "CEnable command: ") | |
120 | (put command 'disabled nil) | |
2308fe27 EZ |
121 | (let ((init-file user-init-file) |
122 | (default-init-file | |
123 | (if (eq system-type 'ms-dos) "~/_emacs" "~/.emacs"))) | |
124 | (when (null init-file) | |
125 | (if (or (file-exists-p default-init-file) | |
126 | (and (eq system-type 'windows-nt) | |
127 | (file-exists-p "~/_emacs"))) | |
128 | ;; Started with -q, i.e. the file containing | |
129 | ;; enabled/disabled commands hasn't been read. Saving | |
130 | ;; settings there would overwrite other settings. | |
131 | (error "Saving settings from \"emacs -q\" would overwrite existing customizations")) | |
132 | (setq init-file default-init-file) | |
49b1a638 EZ |
133 | (if (and (not (file-exists-p init-file)) |
134 | (eq system-type 'windows-nt) | |
135 | (file-exists-p "~/_emacs")) | |
136 | (setq init-file "~/_emacs"))) | |
137 | (save-excursion | |
138 | (set-buffer (find-file-noselect | |
139 | (substitute-in-file-name init-file))) | |
140 | (goto-char (point-min)) | |
141 | (if (search-forward (concat "(put '" (symbol-name command) " ") nil t) | |
142 | (delete-region | |
143 | (progn (beginning-of-line) (point)) | |
144 | (progn (forward-line 1) (point)))) | |
145 | ;; Explicitly enable, in case this command is disabled by default | |
146 | ;; or in case the code we deleted was actually a comment. | |
147 | (goto-char (point-max)) | |
148 | (insert "\n(put '" (symbol-name command) " 'disabled nil)\n") | |
149 | (save-buffer)))) | |
a2535589 | 150 | |
7229064d | 151 | ;;;###autoload |
a2535589 JA |
152 | (defun disable-command (command) |
153 | "Require special confirmation to execute COMMAND from now on. | |
7a4d608f LT |
154 | COMMAND must be a symbol. |
155 | This command alters the user's .emacs file so that this will apply | |
a2535589 JA |
156 | to future sessions." |
157 | (interactive "CDisable command: ") | |
5b817cf2 RS |
158 | (if (not (commandp command)) |
159 | (error "Invalid command name `%s'" command)) | |
a2535589 | 160 | (put command 'disabled t) |
2308fe27 EZ |
161 | (let ((init-file user-init-file) |
162 | (default-init-file | |
163 | (if (eq system-type 'ms-dos) "~/_emacs" "~/.emacs"))) | |
164 | (when (null init-file) | |
165 | (if (or (file-exists-p default-init-file) | |
166 | (and (eq system-type 'windows-nt) | |
167 | (file-exists-p "~/_emacs"))) | |
168 | ;; Started with -q, i.e. the file containing | |
169 | ;; enabled/disabled commands hasn't been read. Saving | |
170 | ;; settings there would overwrite other settings. | |
171 | (error "Saving settings from \"emacs -q\" would overwrite existing customizations")) | |
172 | (setq init-file default-init-file) | |
173 | (if (and (not (file-exists-p init-file)) | |
174 | (eq system-type 'windows-nt) | |
175 | (file-exists-p "~/_emacs")) | |
176 | (setq init-file "~/_emacs"))) | |
177 | (save-excursion | |
178 | (set-buffer (find-file-noselect | |
179 | (substitute-in-file-name init-file))) | |
180 | (goto-char (point-min)) | |
181 | (if (search-forward (concat "(put '" (symbol-name command) " ") nil t) | |
182 | (delete-region | |
183 | (progn (beginning-of-line) (point)) | |
b2b46494 LK |
184 | (progn (forward-line 1) (point))) |
185 | (goto-char (point-max)) | |
186 | (insert ?\n)) | |
187 | (insert "(put '" (symbol-name command) " 'disabled t)\n") | |
2308fe27 | 188 | (save-buffer)))) |
a2535589 | 189 | |
896546cd RS |
190 | (provide 'novice) |
191 | ||
c046590e | 192 | ;; arch-tag: f83c0f96-497e-4db6-a430-8703716c6dd9 |
6594deb0 | 193 | ;;; novice.el ends here |