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+;;; mb-depth.el --- Indicate minibuffer-depth in prompt
+;;
+;; Copyright (C) 2006, 2007 Free Software Foundation, Inc.
+;;
+;; Author: Miles Bader <miles@gnu.org>
+;; Keywords: convenience
+
+;; 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., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+;;
+;; Defines the minor mode `minibuffer-indicate-depth-mode'.
+;;
+;; When active, any recursive use of the minibuffer will show
+;; the recursion depth in the minibuffer prompt.  This is only
+;; useful if `enable-recursive-minibuffers' is non-nil.
+
+;;; Code:
+
+;; An overlay covering the prompt.  This is a buffer-local variable in
+;; each affected minibuffer.
+;;
+(defvar minibuf-depth-overlay)
+(make-variable-buffer-local 'minibuf-depth-overlay)
+
+;; This function goes on minibuffer-setup-hook
+(defun minibuf-depth-setup-minibuffer ()
+  "Set up a minibuffer for `minibuffer-indicate-depth-mode'.
+The prompt should already have been inserted."
+  (when (> (minibuffer-depth) 1)
+    (setq minibuf-depth-overlay (make-overlay (point-min) (1+ (point-min))))
+    (overlay-put minibuf-depth-overlay 'before-string
+		 (propertize (format "[%d]" (minibuffer-depth))
+			     'face 'highlight))
+    (overlay-put minibuf-depth-overlay 'evaporate t)))
+
+;;;###autoload
+(define-minor-mode minibuffer-indicate-depth-mode
+  "Toggle Minibuffer Indicate Depth mode.
+When active, any recursive use of the minibuffer will show
+the recursion depth in the minibuffer prompt.  This is only
+useful if `enable-recursive-minibuffers' is non-nil.
+
+With prefix argument ARG, turn on if positive, otherwise off.
+Returns non-nil if the new state is enabled."
+  :global t
+  :group 'minibuffer
+  (if minibuffer-indicate-depth-mode
+      ;; Enable the mode
+      (add-hook 'minibuffer-setup-hook 'minibuf-depth-setup-minibuffer)
+    ;; Disable the mode
+    (remove-hook 'minibuffer-setup-hook 'minibuf-depth-setup-minibuffer)))
+
+(provide 'mb-depth)
+
+;;; mb-depth.el ends here