Make minibuffer-depth-indicator-function a defcustom

* lisp/mb-depth.el (minibuffer-depth-indicator-function): Make
into a user option (bug#47252).

diff --git a/lisp/mb-depth.el b/lisp/mb-depth.el
index f9a24e34bf2e55aa316a3144da6b8767c8064daa..f79b0f354e2f443ee16e52f13c50b75c5160ff0b 100644 (file)
--- a/lisp/mb-depth.el
+++ b/lisp/mb-depth.el
@@ -30,10 +30,13 @@
 
 ;;; Code:
 
-(defvar minibuffer-depth-indicator-function nil
+(defcustom minibuffer-depth-indicator-function nil
   "If non-nil, function to set up the minibuffer depth indicator.
 It is called with one argument, the minibuffer depth,
-and must return a string.")
+and must return a string."
+  :version "28.1"
+  :type 'function
+  :group 'minibuffer)
 
 (defface minibuffer-depth-indicator '((t :inherit highlight))
   "Face to use for minibuffer depth indicator."