color: sync text attributes and buffered text output on Windows (issue5508) I originally noticed that log output wasn't being colored after 3a4c0905f357, but there were other complications too. With a bunch of untracked files, only the first 1K of characters were colored pink, and the rest were normal white. A single modified file at the top would also be colored pink. Line buffering and full buffering are treated as the same thing in Windows [1], meaning the stream is either buffered or not. I can't find any explicit documentation to say stdout is unbuffered by default when attached to a console (but some internet postings indicated that is the case[2]). Therefore, it seems that explicit flushes are better than just not reopening stdout. NB: pager is now on by default, and needs to be disabled to see any color on Windows. [1] https://msdn.microsoft.com/en-us/library/86cebhfs(v=vs.140).aspx [2] https://sourceforge.net/p/mingw/mailman/message/27121137/

--- a/mercurial/color.py	Sun Mar 19 14:42:45 2017 -0400
+++ b/mercurial/color.py	Sun Mar 19 12:44:45 2017 -0400
@@ -463,9 +463,11 @@
                 for sattr in m.group(1).split(';'):
                     if sattr:
                         attr = mapcolor(int(sattr), attr)
+                ui.flush()
                 _kernel32.SetConsoleTextAttribute(stdout, attr)
                 writefunc(m.group(2), **opts)
                 m = re.match(ansire, m.group(3))
         finally:
             # Explicitly reset original attributes
+            ui.flush()
             _kernel32.SetConsoleTextAttribute(stdout, origattr)