[PATCH 07 of 10] util: implement a faster os.path.split for posix systems

[Bryan O'Sullivan]

# HG changeset patch
# User Bryan O'Sullivan <bryano at fb.com>
# Date 1347562630 25200
# Node ID 9d1ceb24dc23a965d6df2b14ebca30da59139710
# Parent  38159ce2f0115498a0c43b4c84a3f9ba87d08561
util: implement a faster os.path.split for posix systems

diff --git a/mercurial/posix.py b/mercurial/posix.py
--- a/mercurial/posix.py
+++ b/mercurial/posix.py
@@ -20,6 +20,16 @@
 umask = os.umask(0)
 os.umask(umask)
 
+def split(p):
+    '''Same as os.path.split, but faster'''
+    ht = p.rsplit('/', 1)
+    if len(ht) == 1:
+        return '', p
+    nh = ht[0].rstrip('/')
+    if nh:
+        return nh, ht[1]
+    return ht
+
 def openhardlinks():
     '''return true if it is safe to hold open file handles to hardlinks'''
     return True
diff --git a/mercurial/util.py b/mercurial/util.py
--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -62,6 +62,7 @@
 setsignalhandler = platform.setsignalhandler
 shellquote = platform.shellquote
 spawndetached = platform.spawndetached
+split = platform.split
 sshargs = platform.sshargs
 statfiles = platform.statfiles
 termwidth = platform.termwidth
diff --git a/mercurial/windows.py b/mercurial/windows.py
--- a/mercurial/windows.py
+++ b/mercurial/windows.py
@@ -20,6 +20,7 @@
 samefile = win32.samefile
 setsignalhandler = win32.setsignalhandler
 spawndetached = win32.spawndetached
+split = os.path.split
 termwidth = win32.termwidth
 testpid = win32.testpid
 unlink = win32.unlink