Make setup.py more tolerant of invocation mode.

Without this change, setup.py may be sensitive to whether or not
it is referred to with a directory or not:

python ./setup.py ....

vs

python setup.py ....

Author: Michal Ostrowski

python/setup.py

@@ -36,9 +36,10 @@
 
 # Optional PySocks support
 extras_require = dict(Socks=['PySocks >= 1.5.0'])
-
-base_dir = os.path.relpath(os.path.normpath(os.path.split(__file__)[0]),
-                           os.getcwd())
+setup_dir = os.path.split(__file__)[0]
+if setup_dir == '':
+  setup_dir = '.';
+base_dir = os.path.relpath(os.path.normpath(setup_dir), os.getcwd())
 src_dir = os.path.normpath(os.path.join(base_dir, 'src'))
 
 setup(

setup.py

@@ -25,7 +25,7 @@
 import os.path
 import imp
 
-base_dir = os.path.abspath(os.path.split(__file__)[0])
+base_dir = os.path.split(os.path.abspath(__file__))[0]
 
 setup = os.path.join(base_dir, "python", "setup.py")
 fobj = open(setup)