;; Handling of disabled commands ("novice mode") for Emacs.;; Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc.;; This file is part of GNU Emacs.;; GNU Emacs is free software; you can redistribute it and/or modify;; it under the terms of the GNU General Public License as published by;; the Free Software Foundation; either version 1, or (at your option);; any later version.;; GNU Emacs is distributed in the hope that it will be useful,;; but WITHOUT ANY WARRANTY; without even the implied warranty of;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the;; GNU General Public License for more details.;; You should have received a copy of the GNU General Public License;; along with GNU Emacs; see the file COPYING.  If not, write to;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.;; This function is called (by autoloading);; to handle any disabled command.;; The command is found in this-command;; and the keys are returned by (this-command-keys).(defun disabled-command-hook (&rest ignore)  (let (char)    (save-window-excursion     (with-output-to-temp-buffer "*Help*"       (if (= (aref (this-command-keys) 0) ?\M-x)	   (princ "You have invoked the disabled command ")	 (princ "You have typed ")	 (princ (key-description (this-command-keys)))	 (princ ", invoking disabled command "))       (princ this-command)       (princ ":\n")       ;; Print any special message saying why the command is disabled.       (if (stringp (get this-command 'disabled))	   (princ (get this-command 'disabled)))       (princ (or (condition-case ()		      (documentation this-command)		    (error nil))		  "<< not documented >>"))       ;; Keep only the first paragraph of the documentation.       (save-excursion	 (set-buffer "*Help*")	 (goto-char (point-min))	 (if (search-forward "\n\n" nil t)	     (delete-region (1- (point)) (point-max))	   (goto-char (point-max))))       (princ "\n\n")       (princ "You can now typeSpace to try the command just this once,      but leave it disabled,Y to try it and enable it (no questions if you use it again),N to do nothing (command remains disabled)."))     (message "Type y, n or Space: ")     (let ((cursor-in-echo-area t))       (while (not (memq (setq char (downcase (read-char)))			 '(?  ?y ?n)))	 (ding)	 (message "Please type y, n or Space: "))))    (if (= char ?y)	(if (y-or-n-p "Enable command for future editing sessions also? ")	    (enable-command this-command)	  (put this-command 'disabled nil)))    (if (/= char ?n)	(call-interactively this-command))))(defun enable-command (command)  "Allow COMMAND to be executed without special confirmation from now on.The user's .emacs file is altered so that this will applyto future sessions."  (interactive "CEnable command: ")  (put command 'disabled nil)  (save-excursion   (set-buffer (find-file-noselect (substitute-in-file-name "~/.emacs")))   (goto-char (point-min))   (if (search-forward (concat "(put '" (symbol-name command) " ") nil t)       (delete-region	(progn (beginning-of-line) (point))	(progn (forward-line 1) (point)))     ;; Must have been disabled by default.     (goto-char (point-max))     (insert "\n(put '" (symbol-name command) " 'disabled nil)\n"))   (setq foo (buffer-modified-p))   (save-buffer)))(defun disable-command (command)  "Require special confirmation to execute COMMAND from now on.The user's .emacs file is altered so that this will applyto future sessions."  (interactive "CDisable command: ")  (put command 'disabled t)  (save-excursion   (set-buffer (find-file-noselect (substitute-in-file-name "~/.emacs")))   (goto-char (point-min))   (if (search-forward (concat "(put '" (symbol-name command) " ") nil t)       (delete-region	(progn (beginning-of-line) (point))	(progn (forward-line 1) (point))))   (goto-char (point-max))   (insert "(put '" (symbol-name command) " 'disabled t)\n")   (save-buffer)))