[PATCH 1 of 6] color: move '_colormode' to the core 'ui' class

[Pierre-Yves David]

# HG changeset patch
# User Pierre-Yves David <pierre-yves.david at ens-lyon.org>
# Date 1487589128 -3600
#      Mon Feb 20 12:12:08 2017 +0100
# Node ID d32d64e7e9f084bf01cbac178ad2c2e74e130f9d
# Parent  80f04ba7f4d1f439d726068f02172f9a52b981fe
# EXP-Topic color
color: move '_colormode' to the core 'ui' class

Having all 'ui' objects aware of 'color' allows us to update the core code to
handle color. The mode will stay 'None' in the default case so that will not
introduce any changes.

diff -r 80f04ba7f4d1 -r d32d64e7e9f0 hgext/color.py
--- a/hgext/color.py	Thu Dec 22 06:18:45 2016 +0100
+++ b/hgext/color.py	Mon Feb 20 12:12:08 2017 +0100
@@ -297,7 +297,6 @@ def _modesetup(ui, coloropt):
     return None
 
 class colorui(uimod.ui):
-    _colormode = None
     def write(self, *args, **opts):
         if self._colormode is None:
             return super(colorui, self).write(*args, **opts)
diff -r 80f04ba7f4d1 -r d32d64e7e9f0 mercurial/ui.py
--- a/mercurial/ui.py	Thu Dec 22 06:18:45 2016 +0100
+++ b/mercurial/ui.py	Mon Feb 20 12:12:08 2017 +0100
@@ -127,6 +127,8 @@ def _catchterm(*args):
     raise error.SignalInterrupt
 
 class ui(object):
+    # color mode: see mercurial/color.py for possible value
+    _colormode = None
     def __init__(self, src=None):
         """Create a fresh new ui object if no src given