From 808850a4645ddba76657ee35b21120cb9d58a185 Mon Sep 17 00:00:00 2001
From: Martin Grenfell <martin_grenfell@msn.com>
Date: Thu, 19 Jun 2008 22:35:36 +1200
Subject: [PATCH] dont open a file twice in the same tab with o mapping

if the user tells the nerd tree to open a file (without splitting), and
that file is already open in the current tab, then just stick the cursor
in the existing window for the file
---
 plugin/NERD_tree.vim | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/plugin/NERD_tree.vim b/plugin/NERD_tree.vim
index 64e1c1e..d7dfb53 100644
--- a/plugin/NERD_tree.vim
+++ b/plugin/NERD_tree.vim
@@ -2104,7 +2104,12 @@ endfunction
 function! s:OpenFileNode(treenode)
     call s:PutCursorInTreeWin()
 
-    if s:ShouldSplitToOpen(winnr("#"))
+    "if the file is already open in this tab then just stick the cursor in it
+    let winnr = bufwinnr(a:treenode.path.StrForOS(0))
+    if winnr != -1
+        exec winnr . "wincmd w"
+
+    elseif s:ShouldSplitToOpen(winnr("#"))
         call s:OpenFileNodeSplit(a:treenode)
     else
         try