import os

import sys

import warnings 

import ConfigParser # ConfigParser is not a virtualenv module, so we can use it to find the stdlib

dirname = os.path.dirname

distutils_path = os.path.join(os.path.dirname(ConfigParser.__file__), 'distutils')

if os.path.normpath(distutils_path) == os.path.dirname(os.path.normpath(__file__)):

    warnings.warn(

        "The virtualenv distutils package at %s appears to be in the same location as the system distutils?")

else:

    __path__.insert(0, distutils_path)

    exec open(os.path.join(distutils_path, '__init__.py')).read()

import dist

import sysconfig

## patch build_ext (distutils doesn't know how to get the libs directory

## path on windows - it hardcodes the paths around the patched sys.prefix)

if sys.platform == 'win32':

    from distutils.command.build_ext import build_ext as old_build_ext

    class build_ext(old_build_ext):

        def finalize_options (self):

            if self.library_dirs is None:

                self.library_dirs = []

            self.library_dirs.insert(0, os.path.join(sys.real_prefix, "Libs"))

            old_build_ext.finalize_options(self)

    from distutils.command import build_ext as build_ext_module 

    build_ext_module.build_ext = build_ext

## distutils.dist patches:

old_find_config_files = dist.Distribution.find_config_files

def find_config_files(self):

    found = old_find_config_files(self)

    system_distutils = os.path.join(distutils_path, 'distutils.cfg')

    #if os.path.exists(system_distutils):

    #    found.insert(0, system_distutils)

        # What to call the per-user config file

    if os.name == 'posix':

        user_filename = ".pydistutils.cfg"

    else:

        user_filename = "pydistutils.cfg"

    user_filename = os.path.join(sys.prefix, user_filename)

    if os.path.isfile(user_filename):

        for item in list(found):

            if item.endswith('pydistutils.cfg'):

                found.remove(item)

        found.append(user_filename)

    return found

dist.Distribution.find_config_files = find_config_files

## distutils.sysconfig patches:

old_get_python_inc = sysconfig.get_python_inc

def sysconfig_get_python_inc(plat_specific=0, prefix=None):

    if prefix is None:

        prefix = sys.real_prefix

    return old_get_python_inc(plat_specific, prefix)

sysconfig_get_python_inc.__doc__ = old_get_python_inc.__doc__

sysconfig.get_python_inc = sysconfig_get_python_inc

old_get_python_lib = sysconfig.get_python_lib

def sysconfig_get_python_lib(plat_specific=0, standard_lib=0, prefix=None):

    if standard_lib and prefix is None:

        prefix = sys.real_prefix

    return old_get_python_lib(plat_specific, standard_lib, prefix)

sysconfig_get_python_lib.__doc__ = old_get_python_lib.__doc__

sysconfig.get_python_lib = sysconfig_get_python_lib

old_get_config_vars = sysconfig.get_config_vars

def sysconfig_get_config_vars(*args):

    real_vars = old_get_config_vars(*args)

    if sys.platform == 'win32':

        lib_dir = os.path.join(sys.real_prefix, "libs")

        if isinstance(real_vars, dict) and 'LIBDIR' not in real_vars:

            real_vars['LIBDIR'] = lib_dir # asked for all

        elif isinstance(real_vars, list) and 'LIBDIR' in args:

            real_vars = real_vars + [lib_dir] # asked for list

    return real_vars

sysconfig_get_config_vars.__doc__ = old_get_config_vars.__doc__

sysconfig.get_config_vars = sysconfig_get_config_vars