From 990706b72518f7f387afcefc1a1750a23df24cf7 Mon Sep 17 00:00:00 2001
From: Martin Grenfell <martin_grenfell@msn.com>
Date: Fri, 6 Jun 2008 23:33:01 +1200
Subject: [PATCH] restrict mark names to alphanumeric + underscores

---
 plugin/NERD_tree.vim | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/plugin/NERD_tree.vim b/plugin/NERD_tree.vim
index db1308d..46f8819 100644
--- a/plugin/NERD_tree.vim
+++ b/plugin/NERD_tree.vim
@@ -2771,6 +2771,11 @@ endfunction
 " FUNCTION: s:MarkNode(name) {{{2
 " Associate the current node with the given name
 function! s:MarkNode(name)
+    if a:name !~ '^[0-9a-zA-Z_]*$'
+        call s:Echo("Marks must be named using numbers, letters and underscores only")
+        return
+    endif
+
     let currentNode = s:GetSelectedNode()
     if currentNode != {}
         let marks = s:GetMarks()