Add searching of .py files to find_cmd so Twisted's trial runner is found.

Fix necessary for the test suite to run under win32.

IPython/platutils_win32.py

@@ -1,87 +1,94 b''
 # -*- coding: utf-8 -*-
 """ Platform specific utility functions, win32 version
 
 Importing this module directly is not portable - rather, import platutils 
 to use these functions in platform agnostic fashion.
 """
 
 #*****************************************************************************
 #       Copyright (C) 2001-2006 Fernando Perez <[e-mail]>
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #*****************************************************************************
 
 import os
 
 ignore_termtitle = True
 
 try:
     import ctypes
 
     SetConsoleTitleW = ctypes.windll.kernel32.SetConsoleTitleW
     SetConsoleTitleW.argtypes = [ctypes.c_wchar_p]
     
     def set_term_title(title):
         """Set terminal title using ctypes to access the Win32 APIs."""
         SetConsoleTitleW(title)
 
 except ImportError:
     def set_term_title(title):
         """Set terminal title using the 'title' command."""
         global ignore_termtitle
 
         try:
             # Cannot be on network share when issuing system commands
             curr = os.getcwd()
             os.chdir("C:")
             ret = os.system("title " + title)
         finally:
             os.chdir(curr)
         if ret:
             # non-zero return code signals error, don't try again
             ignore_termtitle = True
 
 
 def find_cmd(cmd):
     """Find the full path to a .bat or .exe using the win32api module."""
     try:
-        import win32api
+        from win32api import SearchPath
     except ImportError:
         raise ImportError('you need to have pywin32 installed for this to work')
     else:
-        try:
-            (path, offest) = win32api.SearchPath(os.environ['PATH'],cmd + '.exe')
-        except:
-            (path, offset) = win32api.SearchPath(os.environ['PATH'],cmd + '.bat')
-    return path
+        PATH = os.environ['PATH']
+        extensions = ['.exe', '.com', '.bat', '.py']
+        path = None
+        for ext in extensions:
+            try:
+                path = SearchPath(PATH,cmd + ext)[0]
+            except:
+                pass
+        if path is None:
+            raise OSError("command %r not found" % cmd)
+        else:
+            return path
 
 
 def get_long_path_name(path):
     """Get a long path name (expand ~) on Windows using ctypes.
 
     Examples
     --------
 
     >>> get_long_path_name('c:\\docume~1')
     u'c:\\\\Documents and Settings'
 
     """
     try:
         import ctypes
     except ImportError:
         raise ImportError('you need to have ctypes installed for this to work')
     _GetLongPathName = ctypes.windll.kernel32.GetLongPathNameW
     _GetLongPathName.argtypes = [ctypes.c_wchar_p, ctypes.c_wchar_p,
         ctypes.c_uint ]
 
     buf = ctypes.create_unicode_buffer(260)
     rv = _GetLongPathName(path, buf, 260)
     if rv == 0 or rv > 260:
         return path
     else:
         return buf.value
 
 
 def term_clear():
     os.system('cls')