Merge pull request pyreadline#36 from jstenar/pr/25

Extending PR pyreadline#25

Author: jstenar

pyreadline/__init__.py

@@ -7,8 +7,15 @@
 #  the file COPYING, distributed as part of this software.
 #*****************************************************************************
 from __future__ import print_function, unicode_literals, absolute_import
+from platform import system
+
+_S = system()
+if 'windows' != _S.lower():
+    raise RuntimeError('pyreadline is for Windows only, not {}.'.format(_S))
+del system, _S
 
 from . import unicode_helper
 from . import logger, clipboard, lineeditor, modes, console
 from . rlmain import *
+
 from . import rlmain

setup.py

@@ -12,6 +12,11 @@
 import sys
 import glob
 from distutils.core import setup
+from platform import system
+
+_S = system()
+if 'windows' != _S.lower():
+    raise RuntimeError('pyreadline is for Windows only, not {}.'.format(_S))
 
 # BEFORE importing distutils, remove MANIFEST. distutils doesn't properly
 # update it when the contents of directories change.