[PATCH] Make extdiff work at root directory

[Andrei Vermel]

Symptom: 
If repo is at root dir, 'hg vdiff' fails trying to create an existing temporary dir.

# HG changeset patch
# User Andrei Vermel <avermel at mail.ru>
# Date 1171458420 -10800
# Node ID 95337102a85c84d408ecae063c0a3662cc2973c1
# Parent  c4d9407fa016c5f0ae26e5ea5f58d89012694d05
Make extdiff work at root directory

diff -r c4d9407fa016 -r 95337102a85c hgext/extdiff.py
--- a/hgext/extdiff.py  Wed Feb 14 16:07:00 2007 +0300
+++ b/hgext/extdiff.py  Wed Feb 14 16:07:00 2007 +0300
@@ -82,6 +82,8 @@ def dodiff(ui, repo, diffcmd, diffopts, 
         if not using snapshot, -I/-X does not work and recursive diff
         in tools like kdiff3 and meld displays too many files.'''
         dirname = os.path.basename(repo.root)
+        if dirname == "":
+            dirname = "wdir"
         base = os.path.join(tmproot, dirname)
         os.mkdir(base)
         if not ui.quiet:
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