How to use the httpie.plugins.plugin_manager.get_auth_plugins function in httpie

def _process_auth(self):
        # TODO: refactor
        self.args.auth_plugin = None
        default_auth_plugin = plugin_manager.get_auth_plugins()[0]
        auth_type_set = self.args.auth_type is not None
        url = urlsplit(self.args.url)

        if self.args.auth is None and not auth_type_set:
            if url.username is not None:
                # Handle http://username:password@hostname/
                username = url.username
                password = url.password or ''
                self.args.auth = AuthCredentials(
                    key=username,
                    value=password,
                    sep=SEPARATOR_CREDENTIALS,
                    orig=SEPARATOR_CREDENTIALS.join([username, password])
                )

        if self.args.auth is not None or auth_type_set:

def _process_auth(self):
        # TODO: refactor
        self.args.auth_plugin = None
        default_auth_plugin = plugin_manager.get_auth_plugins()[0]
        auth_type_set = self.args.auth_type is not None
        url = urlsplit(self.args.url)

        if self.args.auth is None and not auth_type_set:
            if url.username is not None:
                # Handle http://username:password@hostname/
                username = url.username
                password = url.password or ''
                self.args.auth = AuthCredentials(
                    key=username,
                    value=password,
                    sep=SEP_CREDENTIALS,
                    orig=SEP_CREDENTIALS.join([username, password])
                )

        if self.args.auth is not None or auth_type_set:

def _process_auth(self):
        # TODO: refactor
        self.args.auth_plugin = None
        default_auth_plugin = plugin_manager.get_auth_plugins()[0]
        auth_type_set = self.args.auth_type is not None
        url = urlsplit(self.args.url)

        if self.args.auth is None and not auth_type_set:
            if url.username is not None:
                # Handle http://username:password@hostname/
                username = url.username
                password = url.password or ''
                self.args.auth = AuthCredentials(
                    key=username,
                    value=password,
                    sep=SEP_CREDENTIALS,
                    orig=SEP_CREDENTIALS.join([username, password])
                )

        if self.args.auth is not None or auth_type_set:

""",
)


class _AuthTypeLazyChoices:
    # Needed for plugin testing

    def __contains__(self, item):
        return item in plugin_manager.get_auth_plugin_mapping()

    def __iter__(self):
        return iter(sorted(plugin_manager.get_auth_plugin_mapping().keys()))


_auth_plugins = plugin_manager.get_auth_plugins()
auth.add_argument(
    '--auth-type', '-A',
    choices=_AuthTypeLazyChoices(),
    default=None,
    help="""
    The authentication mechanism to be used. Defaults to "{default}".

    {types}

    """.format(default=_auth_plugins[0].auth_type, types='\n    '.join(
        '"{type}": {name}{package}{description}'.format(
            type=plugin.auth_type,
            name=plugin.name,
            package=(
                '' if issubclass(plugin, BuiltinAuthPlugin)
                else ' (provided by %s)' % plugin.package_name