diff -r d500ddae7494 -r 4b1af1c867fa mercurial/scmwindows.py
--- a/mercurial/scmwindows.py	Sun Nov 06 00:37:50 2016 -0700
+++ b/mercurial/scmwindows.py	Thu Oct 20 21:38:44 2016 +0900
@@ -5,6 +5,7 @@
 from . import (
     osutil,
     util,
+    win32,
 )
 
 try:
@@ -51,3 +52,6 @@
         path.append(os.path.join(userprofile, 'mercurial.ini'))
         path.append(os.path.join(userprofile, '.hgrc'))
     return path
+
+def termwidth():
+    return win32.termwidth()