# HG changeset patch
# User Sune Foldager <cryo@cyanite.org>
# Date 1529937374 -7200
# Node ID 0b63a6743010dfdbf8a8154186e119949bdaa1cc
# Parent  1322ae04d3d71c9bab8ca6e70c77dfa867421c9b
procutil: use unbuffered stdout on Windows

Windows doesn't support line buffering, treating it as fully buffered. This
causes output of slow commands to stutter. We use unbuffered instead.

diff -r 1322ae04d3d7 -r 0b63a6743010 mercurial/utils/procutil.py
--- a/mercurial/utils/procutil.py	Tue Jun 19 22:45:52 2018 +0900
+++ b/mercurial/utils/procutil.py	Mon Jun 25 16:36:14 2018 +0200
@@ -42,9 +42,13 @@
 
 # glibc determines buffering on first write to stdout - if we replace a TTY
 # destined stdout with a pipe destined stdout (e.g. pager), we want line
-# buffering
+# buffering (or unbuffered, on Windows)
 if isatty(stdout):
-    stdout = os.fdopen(stdout.fileno(), r'wb', 1)
+    if pycompat.iswindows:
+        # Windows doesn't support line buffering
+        stdout = os.fdopen(stdout.fileno(), r'wb', 0)
+    else:
+        stdout = os.fdopen(stdout.fileno(), r'wb', 1)
 
 if pycompat.iswindows:
     from .. import windows as platform