From 0ea9428cd8a18c5d5e8127550f70e13fa286b33b Mon Sep 17 00:00:00 2001
From: Robert Krahn <robert.krahn@gmail.com>
Date: Sun, 26 May 2013 21:04:34 -0700
Subject: [PATCH] emacs: C-u C-x C-x fix (exchangePointAndMark)

---
 lib/ace/keyboard/emacs.js | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/lib/ace/keyboard/emacs.js b/lib/ace/keyboard/emacs.js
index 9b649600..2c2cf34d 100644
--- a/lib/ace/keyboard/emacs.js
+++ b/lib/ace/keyboard/emacs.js
@@ -458,17 +458,25 @@ exports.handler.addCommands({
         multiSelectAction: "forEach"
     },
     exchangePointAndMark: {
-        exec: function(editor) {
+        exec: function(editor, args) {
             var sel = editor.selection;
+            if (args.count) {
+                var pos = editor.getCursorPosition();
+                sel.clearSelection();
+                sel.moveCursorToPosition(editor.popEmacsMark());
+                editor.pushEmacsMark(pos);
+                return;
+            }
+            var lastMark = editor.getLastEmacsMark();
             var range = sel.getRange();
             if (range.isEmpty()) {
-                var lastMark = editor.getLastEmacsMark();
                 sel.selectToPosition(lastMark);
                 return;
             }
-            editor.selection.setSelectionRange(range, !editor.selection.isBackwards());
+            sel.setSelectionRange(range, !sel.isBackwards());
         },
         readonly: true,
+        handlesCount: true,
         multiSelectAction: "forEach"
     },
     killWord: {