From f731e2f977dd330bd8ac8c25bfccef3ddb1e64fa Mon Sep 17 00:00:00 2001
From: Dan Nicolaescu <dann@ics.uci.edu>
Date: Sat, 28 Jun 2008 07:30:47 +0000
Subject: [PATCH] * vc-dir.el (vc-dir-hide-up-to-date): Also hide empty
 directories. (vc-string-prefix-p): Move function ... * vc.el
 (vc-string-prefix-p): ... here.

---
 lisp/ChangeLog |  6 ++++++
 lisp/vc-dir.el | 31 +++++++++++++++++++++++--------
 lisp/vc.el     |  8 +++++---
 3 files changed, 34 insertions(+), 11 deletions(-)

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 1df394338dc..7087c1a3606 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,9 @@
+2008-06-28  Dan Nicolaescu  <dann@ics.uci.edu>
+
+	* vc-dir.el (vc-dir-hide-up-to-date): Also hide empty directories.
+	(vc-string-prefix-p): Move function ...
+	* vc.el (vc-string-prefix-p): ... here.
+
 2008-06-27  Juanma Barranquero  <lekktu@gmail.com>
 
 	* vc-dir.el (vc-dir): Complete only directory names.
diff --git a/lisp/vc-dir.el b/lisp/vc-dir.el
index 17f8b5d91cb..df7caca120c 100644
--- a/lisp/vc-dir.el
+++ b/lisp/vc-dir.el
@@ -478,11 +478,6 @@ If a prefix argument is given, move by that many lines."
 	    (funcall mark-unmark-function))))
     (funcall mark-unmark-function)))
 
-(defun vc-string-prefix-p (prefix string)
-  (let ((lpref (length prefix)))
-    (and (>= (length string) lpref)
-	 (eq t (compare-strings prefix nil nil string nil lpref)))))
-
 (defun vc-dir-parent-marked-p (arg)
   ;; Return nil if none of the parent directories of arg is marked.
   (let* ((argdir (vc-dir-node-directory arg))
@@ -938,9 +933,29 @@ outside of VC) and one wants to do some operation on it."
 (defun vc-dir-hide-up-to-date ()
   "Hide up-to-date items from display."
   (interactive)
-  (ewoc-filter
-   vc-ewoc
-   (lambda (crt) (not (eq (vc-dir-fileinfo->state crt) 'up-to-date)))))
+  (let ((crt (ewoc-nth vc-ewoc -1))
+	(first (ewoc-nth vc-ewoc 0)))
+    ;; Go over from the last item to the first and remove the
+    ;; up-to-date files and directories with no child files.
+    (while (not (eq crt first))
+      (let* ((data (ewoc-data crt))
+	     (dir (vc-dir-fileinfo->directory data))
+	     (next (ewoc-next vc-ewoc crt))
+	     (prev (ewoc-prev vc-ewoc crt))
+	     ;; ewoc-delete does not work without this...
+	     (inhibit-read-only t))
+	  (when (or
+		 ;; Remove directories with no child files.
+		 (and dir
+		      (or
+		       ;; Nothing follows this directory.
+		       (not next)
+		       ;; Next item is a directory.
+		       (vc-dir-fileinfo->directory (ewoc-data next))))
+		 ;; Remove files in the up-to-date state.
+		 (eq (vc-dir-fileinfo->state data) 'up-to-date))
+	    (ewoc-delete vc-ewoc crt))
+	  (setq crt prev)))))
 
 (defun vc-dir-status-printer (fileentry)
   (vc-call-backend vc-dir-backend 'status-printer fileentry))
diff --git a/lisp/vc.el b/lisp/vc.el
index 6cc1dd9c680..c27688e669c 100644
--- a/lisp/vc.el
+++ b/lisp/vc.el
@@ -643,9 +643,6 @@
 ;;
 ;; - vc-dir toolbar needs more icons.
 ;;
-;; - vc-dir-hide-up-to-date needs to hide directories that do not have
-;;   any children anymore.
-;;
 ;;; Code:
 
 (require 'vc-hooks)
@@ -2476,6 +2473,11 @@ to provide the `find-revision' operation instead."
 
 ;; These things should probably be generally available
 
+(defun vc-string-prefix-p (prefix string)
+  (let ((lpref (length prefix)))
+    (and (>= (length string) lpref)
+	 (eq t (compare-strings prefix nil nil string nil lpref)))))
+
 (defun vc-file-tree-walk (dirname func &rest args)
   "Walk recursively through DIRNAME.
 Invoke FUNC f ARGS on each VC-managed file f underneath it."
-- 
2.39.2