[PATCH] color: show mode warning based on ui.formatted

[Xidorn Quan]

# HG changeset patch
# User Xidorn Quan <me at upsuper.org>
# Date 1478829965 -39600
#      Fri Nov 11 13:06:05 2016 +1100
# Node ID 1ffdeb65f19e74ea211af4d9f7c9c4c1dfaa7069
# Parent  e1d6aa0e4c3aed73e0dc523b8a8fd5f9fe23510a
color: show mode warning based on ui.formatted

diff --git a/hgext/color.py b/hgext/color.py
--- a/hgext/color.py
+++ b/hgext/color.py
@@ -270,18 +270,18 @@ def _modesetup(ui, coloropt):
                 realmode = 'ansi'
             else:
                 realmode = 'win32'
         else:
             realmode = 'ansi'
 
     def modewarn():
         # only warn if color.mode was explicitly set and we're in
-        # an interactive terminal
-        if mode == realmode and ui.interactive():
+        # a formatted terminal
+        if mode == realmode and ui.formatted():
             ui.warn(_('warning: failed to set color mode to %s\n') % mode)
 
     if realmode == 'win32':
         _terminfo_params = {}
         if not w32effects:
             modewarn()
             return None
         _effects.update(w32effects)