Place empty abbrev tables after nonempty ones when editing

lisp/ChangeLog

+2011-03-28  Leo Liu  <sdl.web@gmail.com>
+
+	* abbrev.el (abbrev-table-empty-p): New function.
+	(prepare-abbrev-list-buffer): Place empty abbrev tables after
+	nonempty ones.  (Bug#5937)
+
 2011-03-27  Jan Djärv  <jan.h.d@swipnet.se>
 
 	* cus-start.el (all): Add boolean ns-auto-hide-menu-bar.

lisp/abbrev.el

@@ -123,8 +123,13 @@ Otherwise display all abbrevs."
       (if local
           (insert-abbrev-table-description
            (abbrev-table-name local-table) t)
-        (dolist (table abbrev-table-name-list)
-          (insert-abbrev-table-description table t)))
+        (let (empty-tables)
+	  (dolist (table abbrev-table-name-list)
+	    (if (abbrev-table-empty-p (symbol-value table))
+		(push table empty-tables)
+	      (insert-abbrev-table-description table t)))
+	  (dolist (table (nreverse empty-tables))
+	    (insert-abbrev-table-description table t))))
       (goto-char (point-min))
       (set-buffer-modified-p nil)
       (edit-abbrevs-mode)
@@ -420,6 +425,19 @@ PROPS is a list of properties."
   (and (vectorp object)
        (numberp (abbrev-table-get object :abbrev-table-modiff))))
 
+(defun abbrev-table-empty-p (object &optional ignore-system)
+  "Return nil if there are no abbrev symbols in OBJECT.
+If IGNORE-SYSTEM is non-nil, system definitions are ignored."
+  (unless (abbrev-table-p object)
+    (error "Non abbrev table object"))
+  (not (catch 'some
+	 (mapatoms (lambda (abbrev)
+		     (unless (or (zerop (length (symbol-name abbrev)))
+				 (and ignore-system
+				      (abbrev-get abbrev :system)))
+		       (throw 'some t)))
+		   object))))
+
 (defvar global-abbrev-table (make-abbrev-table)
   "The abbrev table whose abbrevs affect all buffers.
 Each buffer may also have a local abbrev table.