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novice.el
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Lisp/Scheme
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1989-01-19
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;; Handling of disabled commands ("novice mode") for Emacs.
;; Copyright (C) 1985 Richard M. Stallman.
;; This file is part of GNU Emacs.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY. No author or distributor
;; accepts responsibility to anyone for the consequences of using it
;; or for whether it serves any particular purpose or works at all,
;; unless he says so in writing. Refer to the GNU Emacs General Public
;; License for full details.
;; Everyone is granted permission to copy, modify and redistribute
;; GNU Emacs, but only under the conditions described in the
;; GNU Emacs General Public License. A copy of this license is
;; supposed to have been given to you along with GNU Emacs so you
;; can know your rights and responsibilities. It should be in a
;; file named COPYING. Among other things, the copyright notice
;; and this notice must be preserved on all copies.
;; This function is called (autoloaded)
;; 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*"
(princ "You have typed ")
(princ (key-description (this-command-keys)))
(princ ", invoking disabled command ")
(princ this-command)
(princ ":\n")
(princ (or (documentation this-command) "<< not documented >>"))
(princ "\n\n")
(princ "You can now type
Space 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: ")
(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 apply
to future sessions."
(interactive "CEnable command: ")
(put command 'disabled nil)
(save-excursion
(set-buffer (find-file-noselect (substitute-in-file-name "~/emacs.rc")))
(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 apply
to future sessions."
(interactive "CDisable command: ")
(put command 'disabled t)
(save-excursion
(set-buffer (find-file-noselect (substitute-in-file-name "~/emacs.rc")))
(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)))