(disabled-command-hook): Use `defvar' and add documentation string.

(disabled-command-hook): New option ! turns off disabled commands.

1 files changed, 10 insertions, 6 deletions

diff --git a/lisp/novice.el b/lisp/novice.el
index eb7c5f20b5b..29594e6b7dc 100644
--- a/lisp/novice.el
+++ b/lisp/novice.el
@@ -36,7 +36,9 @@
 ;; and the keys are returned by (this-command-keys).
 
 ;;;###autoload
-(setq disabled-command-hook 'disabled-command-hook)
+(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)
@@ -73,19 +75,21 @@
            (goto-char (point-max))))
        (princ "\n\n")
        (princ "You can now type
-Space to try the command just this once,
-      but leave it disabled,
+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),
+! to try it and enable all commands in this session, or
 N to do nothing (command remains disabled).")
        (save-excursion
         (set-buffer standard-output)
         (help-mode)))
-     (message "Type y, n or Space: ")
+     (message "Type y, n, ! or Space: ")
      (let ((cursor-in-echo-area t))
        (while (not (memq (setq char (downcase (read-char)))
-                         '(?  ?y ?n)))
+                         '(?! ?  ?y ?n)))
          (ding)
-         (message "Please type y, n or Space: "))))
+         (message "Please type y, n, ! or Space: "))))
+    (if (= char ?!)
+        (setq disabled-command-hook nil))
     (if (= char ?y)
         (if (and user-init-file
                  (not (string= "" user-init-file))