# HG changeset patch
# User Steve Borho <steve@borho.org>
# Date 1295642535 21600
# Node ID 2ef915184ff297e38e342397433440ea02abdec6
# Parent  75d0c38a0bca3501aaa3fa6b8c26de8ca0270803
win32: win32console.GetStdHandle() can return None

When the Mercurial Python libraries are used within a Windows application with
no console, there is no stderr file handle.

diff -r 75d0c38a0bca -r 2ef915184ff2 mercurial/win32.py
--- a/mercurial/win32.py	Sun Jan 09 00:35:36 2011 +0900
+++ b/mercurial/win32.py	Fri Jan 21 14:42:15 2011 -0600
@@ -170,6 +170,8 @@
     try:
         # Query stderr to avoid problems with redirections
         screenbuf = win32console.GetStdHandle(win32console.STD_ERROR_HANDLE)
+        if screenbuf is None:
+            return 79
         try:
             window = screenbuf.GetConsoleScreenBufferInfo()['Window']
             width = window.Right - window.Left