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import sys
from distutils.core import Distribution

if 'setuptools' in sys.modules:
    have_setuptools = True
    from setuptools import setup as old_setup
    # easy_install imports math, it may be picked up from cwd
    from setuptools.command import easy_install
    try:
        # very old versions of setuptools don't have this
        from setuptools.command import bdist_egg
    except ImportError:
        have_setuptools = False
else:
    from distutils.core import setup as old_setup
    have_setuptools = False

import warnings
import distutils.core
import distutils.dist

from numpy.distutils.extension import Extension  # noqa: F401
from numpy.distutils.numpy_distribution import NumpyDistribution
from numpy.distutils.command import config, config_compiler, \
     build, build_py, build_ext, build_clib, build_src, build_scripts, \
     sdist, install_data, install_headers, install, bdist_rpm, \
     install_clib
from numpy.distutils.misc_util import is_sequence, is_string

numpy_cmdclass = {'build':            build.build,
                  'build_src':        build_src.build_src,
                  'build_scripts':    build_scripts.build_scripts,
                  'config_cc':        config_compiler.config_cc,
                  'config_fc':        config_compiler.config_fc,
                  'config':           config.config,
                  'build_ext':        build_ext.build_ext,
                  'build_py':         build_py.build_py,
                  'build_clib':       build_clib.build_clib,
                  'sdist':            sdist.sdist,
                  'install_data':     install_data.install_data,
                  'install_headers':  install_headers.install_headers,
                  'install_clib':     install_clib.install_clib,
                  'install':          install.install,
                  'bdist_rpm':        bdist_rpm.bdist_rpm,
                  }
if have_setuptools:
    # Use our own versions of develop and egg_info to ensure that build_src is
    # handled appropriately.
    from numpy.distutils.command import develop, egg_info
    numpy_cmdclass['bdist_egg'] = bdist_egg.bdist_egg
    numpy_cmdclass['develop'] = develop.develop
    numpy_cmdclass['easy_install'] = easy_install.easy_install
    numpy_cmdclass['egg_info'] = egg_info.egg_info

def _dict_append(d, **kws):
    for k, v in kws.items():
        if k not in d:
            d[k] = v
            continue
        dv = d[k]
        if isinstance(dv, tuple):
            d[k] = dv + tuple(v)
        elif isinstance(dv, list):
            d[k] = dv + list(v)
        elif isinstance(dv, dict):
            _dict_append(dv, **v)
        elif is_string(dv):
            d[k] = dv + v
        else:
            raise TypeError(repr(type(dv)))

def _command_line_ok(_cache=None):
    """ Return True if command line does not contain any
    help or display requests.
    """
    if _cache:
        return _cache[0]
    elif _cache is None:
        _cache = []
    ok = True
    display_opts = ['--'+n for n in Distribution.display_option_names]
    for o in Distribution.display_options:
        if o[1]:
            display_opts.append('-'+o[1])
    for arg in sys.argv:
        if arg.startswith('--help') or arg=='-h' or arg in display_opts:
            ok = False
            break
    _cache.append(ok)
    return ok

def get_distribution(always=False):
    dist = distutils.core._setup_distribution
    # XXX Hack to get numpy installable with easy_install.
    # The problem is easy_install runs it's own setup(), which
    # sets up distutils.core._setup_distribution. However,
    # when our setup() runs, that gets overwritten and lost.
    # We can't use isinstance, as the DistributionWithoutHelpCommands
    # class is local to a function in setuptools.command.easy_install
    if dist is not None and \
            'DistributionWithoutHelpCommands' in repr(dist):
        dist = None
    if always and dist is None:
        dist = NumpyDistribution()
    return dist

def setup(**attr):

    cmdclass = numpy_cmdclass.copy()

    new_attr = attr.copy()
    if 'cmdclass' in new_attr:
        cmdclass.update(new_attr['cmdclass'])
    new_attr['cmdclass'] = cmdclass

    if 'configuration' in new_attr:
        # To avoid calling configuration if there are any errors
        # or help request in command in the line.
        configuration = new_attr.pop('configuration')

        old_dist = distutils.core._setup_distribution
        old_stop = distutils.core._setup_stop_after
        distutils.core._setup_distribution = None
        distutils.core._setup_stop_after = "commandline"
        try:
            dist = setup(**new_attr)
        finally:
            distutils.core._setup_distribution = old_dist
            distutils.core._setup_stop_after = old_stop
        if dist.help or not _command_line_ok():
            # probably displayed help, skip running any commands
            return dist

        # create setup dictionary and append to new_attr
        config = configuration()
        if hasattr(config, 'todict'):
            config = config.todict()
        _dict_append(new_attr, **config)

    # Move extension source libraries to libraries
    libraries = []
    for ext in new_attr.get('ext_modules', []):
        new_libraries = []
        for item in ext.libraries:
            if is_sequence(item):
                lib_name, build_info = item
                _check_append_ext_library(libraries, lib_name, build_info)
                new_libraries.append(lib_name)
            elif is_string(item):
                new_libraries.append(item)
            else:
                raise TypeError("invalid description of extension module "
                                "library %r" % (item,))
        ext.libraries = new_libraries
    if libraries:
        if 'libraries' not in new_attr:
            new_attr['libraries'] = []
        for item in libraries:
            _check_append_library(new_attr['libraries'], item)

    # sources in ext_modules or libraries may contain header files
    if ('ext_modules' in new_attr or 'libraries' in new_attr) \
       and 'headers' not in new_attr:
        new_attr['headers'] = []

    # Use our custom NumpyDistribution class instead of distutils' one
    new_attr['distclass'] = NumpyDistribution

    return old_setup(**new_attr)

def _check_append_library(libraries, item):
    for libitem in libraries:
        if is_sequence(libitem):
            if is_sequence(item):
                if item[0]==libitem[0]:
                    if item[1] is libitem[1]:
                        return
                    warnings.warn("[0] libraries list contains %r with"
                                  " different build_info" % (item[0],),
                                  stacklevel=2)
                    break
            else:
                if item==libitem[0]:
                    warnings.warn("[1] libraries list contains %r with"
                                  " no build_info" % (item[0],),
                                  stacklevel=2)
                    break
        else:
            if is_sequence(item):
                if item[0]==libitem:
                    warnings.warn("[2] libraries list contains %r with"
                                  " no build_info" % (item[0],),
                                  stacklevel=2)
                    break
            else:
                if item==libitem:
                    return
    libraries.append(item)

def _check_append_ext_library(libraries, lib_name, build_info):
    for item in libraries:
        if is_sequence(item):
            if item[0]==lib_name:
                if item[1] is build_info:
                    return
                warnings.warn("[3] libraries list contains %r with"
                              " different build_info" % (lib_name,),
                              stacklevel=2)
                break
        elif item==lib_name:
            warnings.warn("[4] libraries list contains %r with"
                          " no build_info" % (lib_name,),
                          stacklevel=2)
            break
    libraries.append((lib_name, build_info))