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[Emacs-diffs] Changes to emacs/lisp/novice.el [lexbind]
From: |
Miles Bader |
Subject: |
[Emacs-diffs] Changes to emacs/lisp/novice.el [lexbind] |
Date: |
Tue, 14 Oct 2003 19:52:12 -0400 |
Index: emacs/lisp/novice.el
diff -c /dev/null emacs/lisp/novice.el:1.31.2.1
*** /dev/null Tue Oct 14 19:52:12 2003
--- emacs/lisp/novice.el Tue Oct 14 19:51:20 2003
***************
*** 0 ****
--- 1,181 ----
+ ;;; novice.el --- handling of disabled commands ("novice mode") for Emacs
+
+ ;; Copyright (C) 1985, 1986, 1987, 1994, 2002 Free Software Foundation, Inc.
+
+ ;; Maintainer: FSF
+ ;; Keywords: internal, help
+
+ ;; 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 2, 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, Inc., 59 Temple Place - Suite 330,
+ ;; Boston, MA 02111-1307, USA.
+
+ ;;; Commentary:
+
+ ;; This mode provides a hook which is, by default, attached to various
+ ;; putatively dangerous commands in a (probably futile) attempt to
+ ;; prevent lusers from shooting themselves in the feet.
+
+ ;;; Code:
+
+ ;; 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).
+
+ ;;;###autoload
+ (defvar disabled-command-hook 'disabled-command-hook
+ "Function to call to handle disabled commands.
+ If nil, the feature is disabled, i.e., all commands work normally.")
+
+ ;;;###autoload
+ (defun disabled-command-hook (&rest ignore)
+ (let (char)
+ (save-window-excursion
+ (with-output-to-temp-buffer "*Help*"
+ (let ((keys (this-command-keys)))
+ (if (or (eq (aref keys 0)
+ (if (stringp keys)
+ (aref "\M-x" 0)
+ ?\M-x))
+ (and (>= (length keys) 2)
+ (eq (aref keys 0) meta-prefix-char)
+ (eq (aref keys 1) ?x)))
+ (princ (format "You have invoked the disabled command %s.\n"
+ (symbol-name this-command)))
+ (princ (format "You have typed %s, invoking disabled command %s.\n"
+ (key-description keys) (symbol-name this-command)))))
+ ;; Print any special message saying why the command is disabled.
+ (if (stringp (get this-command 'disabled))
+ (princ (get this-command 'disabled))
+ (princ "It is disabled because new users often find it confusing.\n")
+ (princ "Here's the first part of its description:\n\n")
+ ;; Keep only the first paragraph of the documentation.
+ (with-current-buffer "*Help*"
+ (goto-char (point-max))
+ (let ((start (point)))
+ (save-excursion
+ (princ (or (condition-case ()
+ (documentation this-command)
+ (error nil))
+ "<< not documented >>")))
+ (if (search-forward "\n\n" nil t)
+ (delete-region (match-beginning 0) (point-max)))
+ (goto-char (point-max))
+ (indent-rigidly start (point) 3))))
+ (princ "\n\nDo you want to use this command anyway?\n\n")
+ (princ "You can now type
+ y to try it and enable it (no questions if you use it again).
+ n to cancel--don't try the command, and it remains disabled.
+ SPC to try the command just this once, but leave it disabled.
+ ! to try it, and enable all disabled commands for this session only.")
+ (save-excursion
+ (set-buffer standard-output)
+ (help-mode)))
+ (message "Type y, n, ! or SPC (the space bar): ")
+ (let ((cursor-in-echo-area t))
+ (while (not (memq (setq char (downcase (read-char)))
+ '(?! ? ?y ?n)))
+ (ding)
+ (message "Please type y, n, ! or SPC (the space bar): "))))
+ (if (= char ?!)
+ (setq disabled-command-hook nil))
+ (if (= char ?y)
+ (if (and user-init-file
+ (not (string= "" user-init-file))
+ (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))))
+
+ ;;;###autoload
+ (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 apply
+ to future sessions."
+ (interactive "CEnable command: ")
+ (put command 'disabled nil)
+ (let ((init-file user-init-file)
+ (default-init-file
+ (if (eq system-type 'ms-dos) "~/_emacs" "~/.emacs")))
+ (when (null init-file)
+ (if (or (file-exists-p default-init-file)
+ (and (eq system-type 'windows-nt)
+ (file-exists-p "~/_emacs")))
+ ;; Started with -q, i.e. the file containing
+ ;; enabled/disabled commands hasn't been read. Saving
+ ;; settings there would overwrite other settings.
+ (error "Saving settings from \"emacs -q\" would overwrite existing
customizations"))
+ (setq init-file default-init-file)
+ (if (and (not (file-exists-p init-file))
+ (eq system-type 'windows-nt)
+ (file-exists-p "~/_emacs"))
+ (setq init-file "~/_emacs")))
+ (save-excursion
+ (set-buffer (find-file-noselect
+ (substitute-in-file-name init-file)))
+ (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))))
+ ;; Explicitly enable, in case this command is disabled by default
+ ;; or in case the code we deleted was actually a comment.
+ (goto-char (point-max))
+ (insert "\n(put '" (symbol-name command) " 'disabled nil)\n")
+ (save-buffer))))
+
+ ;;;###autoload
+ (defun disable-command (command)
+ "Require special confirmation to execute COMMAND from now on.
+ The user's .emacs file is altered so that this will apply
+ to future sessions."
+ (interactive "CDisable command: ")
+ (if (not (commandp command))
+ (error "Invalid command name `%s'" command))
+ (put command 'disabled t)
+ (let ((init-file user-init-file)
+ (default-init-file
+ (if (eq system-type 'ms-dos) "~/_emacs" "~/.emacs")))
+ (when (null init-file)
+ (if (or (file-exists-p default-init-file)
+ (and (eq system-type 'windows-nt)
+ (file-exists-p "~/_emacs")))
+ ;; Started with -q, i.e. the file containing
+ ;; enabled/disabled commands hasn't been read. Saving
+ ;; settings there would overwrite other settings.
+ (error "Saving settings from \"emacs -q\" would overwrite existing
customizations"))
+ (setq init-file default-init-file)
+ (if (and (not (file-exists-p init-file))
+ (eq system-type 'windows-nt)
+ (file-exists-p "~/_emacs"))
+ (setq init-file "~/_emacs")))
+ (save-excursion
+ (set-buffer (find-file-noselect
+ (substitute-in-file-name init-file)))
+ (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 "\n(put '" (symbol-name command) " 'disabled t)\n")
+ (save-buffer))))
+
+ (provide 'novice)
+
+ ;;; arch-tag: f83c0f96-497e-4db6-a430-8703716c6dd9
+ ;;; novice.el ends here
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Miles Bader <=