[PATCH 2 of 8] formatter: open raw template file in binary mode (BC)

[Yuya Nishihara]

# HG changeset patch
# User Yuya Nishihara <yuya at tcha.org>
# Date 1494049651 -32400
#      Sat May 06 14:47:31 2017 +0900
# Node ID 4642ef5a653b3daa3db1121e8bdd1351b98b28fc
# Parent  ce83b5ca8a012516342b2228da00da3c70f6218a
formatter: open raw template file in binary mode (BC)

I believe it was a mistake to open file in text mode. Now '\r' is preserved
on Windows, but it should be okay to print '\r\n' as long as users live in
such platform.

diff --git a/mercurial/formatter.py b/mercurial/formatter.py
--- a/mercurial/formatter.py
+++ b/mercurial/formatter.py
@@ -399,7 +399,7 @@ def lookuptemplate(ui, topic, tmpl):
         # is it a mapfile for a style?
         if os.path.basename(tmpl).startswith("map-"):
             return None, os.path.realpath(tmpl)
-        with open(tmpl) as f:
+        with open(tmpl, 'rb') as f:
             tmpl = f.read()
         return tmpl, None