147 lines
5 KiB
EmacsLisp
147 lines
5 KiB
EmacsLisp
;;; novice.el --- handling of disabled commands ("novice mode") for Emacs.
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;; Copyright (C) 1985, 1986, 1987, 1994 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: internal, help
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This mode provides a hook which is, by default, attached to various
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;; putatively dangerous commands in a (probably futile) attempt to
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;; prevent lusers from shooting themselves in the feet.
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;;; Code:
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;; This function is called (by autoloading)
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;; to handle any disabled command.
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;; The command is found in this-command
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;; and the keys are returned by (this-command-keys).
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;;;###autoload
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(defvar disabled-command-hook 'disabled-command-hook
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"Function to call to handle disabled commands.
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If nil, the feature is disabled, i.e., all commands work normally.")
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;;;###autoload
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(defun disabled-command-hook (&rest ignore)
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(let (char)
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(save-window-excursion
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(with-output-to-temp-buffer "*Help*"
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(let ((keys (this-command-keys)))
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(if (or (eq (aref keys 0)
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(if (stringp keys)
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(aref "\M-x" 0)
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?\M-x))
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(and (>= (length keys) 2)
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(eq (aref keys 0) meta-prefix-char)
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(eq (aref keys 1) ?x)))
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(princ "You have invoked the disabled command ")
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(princ "You have typed ")
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(princ (key-description keys))
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(princ ", invoking disabled command ")))
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(princ this-command)
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(princ ":\n")
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;; Print any special message saying why the command is disabled.
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(if (stringp (get this-command 'disabled))
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(princ (get this-command 'disabled)))
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;; Keep only the first paragraph of the documentation.
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(save-excursion
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(set-buffer "*Help*")
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(goto-char (point-max))
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(save-excursion
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(princ (or (condition-case ()
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(documentation this-command)
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(error nil))
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"<< not documented >>")))
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(if (search-forward "\n\n" nil t)
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(delete-region (1- (point)) (point-max))
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(goto-char (point-max))))
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(princ "\n\n")
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(princ "You can now type
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Space to try the command just this once, but leave it disabled,
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Y to try it and enable it (no questions if you use it again),
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! to try it and enable all commands in this session, or
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N to do nothing (command remains disabled).")
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(save-excursion
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(set-buffer standard-output)
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(help-mode)))
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(message "Type y, n, ! or Space: ")
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(let ((cursor-in-echo-area t))
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(while (not (memq (setq char (downcase (read-char)))
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'(?! ? ?y ?n)))
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(ding)
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(message "Please type y, n, ! or Space: "))))
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(if (= char ?!)
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(setq disabled-command-hook nil))
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(if (= char ?y)
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(if (and user-init-file
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(not (string= "" user-init-file))
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(y-or-n-p "Enable command for future editing sessions also? "))
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(enable-command this-command)
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(put this-command 'disabled nil)))
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(if (/= char ?n)
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(call-interactively this-command))))
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;;;###autoload
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(defun enable-command (command)
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"Allow COMMAND to be executed without special confirmation from now on.
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The user's .emacs file is altered so that this will apply
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to future sessions."
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(interactive "CEnable command: ")
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(put command 'disabled nil)
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(save-excursion
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(set-buffer (find-file-noselect
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(substitute-in-file-name user-init-file)))
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(goto-char (point-min))
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(if (search-forward (concat "(put '" (symbol-name command) " ") nil t)
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(delete-region
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(progn (beginning-of-line) (point))
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(progn (forward-line 1) (point))))
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;; Explicitly enable, in case this command is disabled by default
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;; or in case the code we deleted was actually a comment.
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(goto-char (point-max))
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(insert "\n(put '" (symbol-name command) " 'disabled nil)\n")
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(save-buffer)))
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;;;###autoload
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(defun disable-command (command)
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"Require special confirmation to execute COMMAND from now on.
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The user's .emacs file is altered so that this will apply
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to future sessions."
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(interactive "CDisable command: ")
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(if (not (commandp command))
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(error "Invalid command name `%s'" command))
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(put command 'disabled t)
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(save-excursion
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(set-buffer (find-file-noselect
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(substitute-in-file-name user-init-file)))
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(goto-char (point-min))
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(if (search-forward (concat "(put '" (symbol-name command) " ") nil t)
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(delete-region
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(progn (beginning-of-line) (point))
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(progn (forward-line 1) (point))))
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(goto-char (point-max))
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(insert "\n(put '" (symbol-name command) " 'disabled t)\n")
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(save-buffer)))
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(provide 'novice)
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;;; novice.el ends here
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