# HG changeset patch
# User Jun Wu <quark@fb.com>
# Date 2017-10-13 02:20:04
# Node ID c0a6c19690ff0e424df0897aa0ce3e9dd44f637b
# Parent  f42dec9c976e8059a44edda5db47352df0a93b4a

pycompat: define operating system constants

As suggested by Ryan in D1019, it's cleaner if we use defined constants
instead of `osname == 'nt'` everywhere.

Differential Revision: https://phab.mercurial-scm.org/D1033

diff --git a/mercurial/pycompat.py b/mercurial/pycompat.py
--- a/mercurial/pycompat.py
+++ b/mercurial/pycompat.py
@@ -316,3 +316,7 @@ else:
     rawinput = raw_input
 
 isjython = sysplatform.startswith('java')
+
+isdarwin = sysplatform == 'darwin'
+isposix = osname == 'posix'
+iswindows = osname == 'nt'