2 files changed, 12 insertions, 1 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index eaaf7b35c3d..c59e0003f94 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,8 @@
+2004-08-07  Satyaki Das  <satyaki@theforce.stanford.edu>  (tiny change)
+
+        * simple.el (completion-root-regexp): New defvar.
+        (completion-setup-function): Use it instead of a literal string.
+
 2004-08-07  John Paul Wallington  <jpw@gnu.org>
 
         * emacs-lisp/re-builder.el (reb-re-syntax): Add `rx' syntax.
diff --git a/lisp/simple.el b/lisp/simple.el
index 1e112b1be74..b52220d542b 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -4304,6 +4304,12 @@ make the common parts less visible than normal, so that the rest
 of the differing parts is, by contrast, slightly highlighted."
   :group 'completion)
 
+;; This is for packages that need to bind it to a non-default regexp
+;; in order to make the first-differing character highlight work
+;; to their liking
+(defvar completion-root-regexp "^/"
+  "Regexp to use in `completion-setup-function' to find the root directory.")
+
 (defun completion-setup-function ()
   (let ((mainbuf (current-buffer))
         (mbuf-contents (minibuffer-contents)))
@@ -4332,7 +4338,7 @@ of the differing parts is, by contrast, slightly highlighted."
                 (with-current-buffer mainbuf
                   (save-excursion
                     (goto-char (point-max))
-                    (skip-chars-backward "^/")
+                    (skip-chars-backward completion-root-regexp)
                     (- (point) (minibuffer-prompt-end)))))
         ;; Otherwise, in minibuffer, the whole input is being completed.
         (if (minibufferp mainbuf)