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Annotation of 43BSD/contrib/emacs/lisp/novice.el, revision 1.1.1.1

1.1       root        1: ;; Handling of disabled commands ("novice mode") for Emacs.
                      2: ;; Copyright (C) 1985 Richard M. Stallman.
                      3: 
                      4: ;; This file is part of GNU Emacs.
                      5: 
                      6: ;; GNU Emacs is distributed in the hope that it will be useful,
                      7: ;; but WITHOUT ANY WARRANTY.  No author or distributor
                      8: ;; accepts responsibility to anyone for the consequences of using it
                      9: ;; or for whether it serves any particular purpose or works at all,
                     10: ;; unless he says so in writing.  Refer to the GNU Emacs General Public
                     11: ;; License for full details.
                     12: 
                     13: ;; Everyone is granted permission to copy, modify and redistribute
                     14: ;; GNU Emacs, but only under the conditions described in the
                     15: ;; GNU Emacs General Public License.   A copy of this license is
                     16: ;; supposed to have been given to you along with GNU Emacs so you
                     17: ;; can know your rights and responsibilities.  It should be in a
                     18: ;; file named COPYING.  Among other things, the copyright notice
                     19: ;; and this notice must be preserved on all copies.
                     20: 
                     21: 
                     22: ;; This function is called (autoloaded)
                     23: ;; to handle any disabled command.
                     24: ;; The command is found in this-command
                     25: ;; and the keys are returned by (this-command-keys).
                     26: 
                     27: (defun disabled-command-hook (&rest ignore)
                     28:   (let (char)
                     29:     (save-window-excursion
                     30:      (with-output-to-temp-buffer "*Help*"
                     31:        (princ "You have typed ")
                     32:        (princ (key-description (this-command-keys)))
                     33:        (princ ", invoking disabled command ")
                     34:        (princ this-command)
                     35:        (princ ":\n")
                     36:        (princ (or (documentation this-command) "<< not documented >>"))
                     37:        (princ "\n\n")
                     38:        (princ "You can now type
                     39: Space to try the command just this once,
                     40:       but leave it disabled,
                     41: Y to try it and enable it (no questions if you use it again),
                     42: N to do nothing (command remains disabled)."))
                     43:      (message "Type y, n or Space: ")
                     44:      (while (not (memq (setq char (downcase (read-char)))
                     45:                       '(?  ?y ?n)))
                     46:        (ding)
                     47:        (message "Please type y, n or Space: ")))
                     48:     (if (= char ?y)
                     49:        (if (y-or-n-p "Enable command for future editing sessions also? ")
                     50:            (enable-command this-command)
                     51:          (put this-command 'disabled nil)))
                     52:     (if (/= char ?n)
                     53:        (call-interactively this-command))))
                     54: 
                     55: (defun enable-command (command)
                     56:   "Allow COMMAND to be executed without special confirmation from now on.
                     57: The user's .emacs file is altered so that this will apply
                     58: to future sessions."
                     59:   (interactive "CEnable command: ")
                     60:   (put command 'disabled nil)
                     61:   (save-excursion
                     62:    (set-buffer (find-file-noselect (substitute-in-file-name "~/.emacs")))
                     63:    (goto-char (point-min))
                     64:    (if (search-forward (concat "(put '" (symbol-name command) " ") nil t)
                     65:        (delete-region
                     66:        (progn (beginning-of-line) (point))
                     67:        (progn (forward-line 1) (point)))
                     68:      ;; Must have been disabled by default.
                     69:      (goto-char (point-max))
                     70:      (insert "\n(put '" (symbol-name command) " 'disabled nil)\n"))
                     71:    (setq foo (buffer-modified-p))
                     72:    (save-buffer)))
                     73: 
                     74: (defun disable-command (command)
                     75:   "Require special confirmation to execute COMMAND from now on.
                     76: The user's .emacs file is altered so that this will apply
                     77: to future sessions."
                     78:   (interactive "CDisable command: ")
                     79:   (put command 'disabled t)
                     80:   (save-excursion
                     81:    (set-buffer (find-file-noselect (substitute-in-file-name "~/.emacs")))
                     82:    (goto-char (point-min))
                     83:    (if (search-forward (concat "(put '" (symbol-name command) " ") nil t)
                     84:        (delete-region
                     85:        (progn (beginning-of-line) (point))
                     86:        (progn (forward-line 1) (point))))
                     87:    (goto-char (point-max))
                     88:    (insert "(put '" (symbol-name command) " 'disabled t)\n")
                     89:    (save-buffer)))
                     90: 

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