capybara/virtualenv/lib/python2.7/site-packages/wheel/metadata.py
def pkginfo_to_metadata(egg_info_path, pkginfo_path):
    """
    Convert .egg-info directory with PKG-INFO to the Metadata 1.3 aka
    old-draft Metadata 2.0 format.
    """
    pkg_info = read_pkg_info(pkginfo_path)
    pkg_info.replace_header('Metadata-Version', '2.0')
    requires_path = os.path.join(egg_info_path, 'requires.txt')
    if os.path.exists(requires_path):
        requires = open(requires_path).read()
        for extra, reqs in pkg_resources.split_sections(requires):
            condition = ''
            if extra and ':' in extra: # setuptools extra:condition syntax
                extra, condition = extra.split(':', 1)
            if extra:
                pkg_info['Provides-Extra'] = extra
                if condition:
                    condition += " and "
                condition += 'extra == %s' % repr(extra)
            if condition:
                condition = '; ' + condition
            for new_req in convert_requirements(reqs):
                pkg_info['Requires-Dist'] = new_req + condition

    description = pkg_info['Description']
    if description:
        pkg_info.set_payload(dedent_description(pkg_info))
        del pkg_info['Description']

    return pkg_info
def pkginfo_to_metadata(egg_info_path, pkginfo_path):
    """
    Convert .egg-info directory with PKG-INFO to the Metadata 1.3 aka
    old-draft Metadata 2.0 format.
    """
    pkg_info = read_pkg_info(pkginfo_path)
    pkg_info.replace_header('Metadata-Version', '2.0')
    requires_path = os.path.join(egg_info_path, 'requires.txt')
    if os.path.exists(requires_path):
        requires = open(requires_path).read()
        for extra, reqs in pkg_resources.split_sections(requires):
            condition = ''
            if extra and ':' in extra: # setuptools extra:condition syntax
                extra, condition = extra.split(':', 1)
            if extra:
                pkg_info['Provides-Extra'] = extra
                if condition:
                    condition += " and "
                condition += 'extra == %s' % repr(extra)
            if condition:
                condition = '; ' + condition
            for new_req in convert_requirements(reqs):
                pkg_info['Requires-Dist'] = new_req + condition

    description = pkg_info['Description']
    if description:
        pkg_info.set_payload(dedent_description(pkg_info))
        del pkg_info['Description']

    return pkg_info
Convert .egg-info directory with PKG-INFO to the Metadata 1.3 aka
    old-draft Metadata 2.0 format.