# coding=utf-8
# Copyright (c) 2015-2016, 2019 Intel Corporation

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"""Shared parsers for use in multiple modules.

Much of this module is based on taking advantage of ArgumentParser's parent
argument and it's parse_known_args() method. The idea is that some parts of
parsers can be shared to reduce code duplication, either by parsing the
argumetns early and acting on them, or by inheriting from a parent object.

"""

from __future__ import (
    absolute_import, division, print_function, unicode_literals
)
import argparse

from framework import core

# parse the config file before any other options, this allows the config file
# to be used to set default values for the parser.
CONFIG = argparse.ArgumentParser(add_help=False)
CONFIG.add_argument("-f", "--config",
                    dest="config_file",
                    type=argparse.FileType("r"),
                    help="override piglit.conf search path")


def parse_config(input_):
    """Convenience method for the CONFIG parser.

    This returns a two element tuple, the first element is a namespace with the
    known arguments in it (in this case the config_file), and the second is the
    remaining unparsed arguments. These remaining arguments should be passed to
    a new ArgumentParser instance.

    This will also call core.get_config on the config file. The parsed options
    are passed to ensure API compatibility

    """
    parsed, unparsed = CONFIG.parse_known_args(input_)

    # Read the config file
    # We want to read this before we finish parsing since some default options
    # are set in the config file.
    core.get_config(parsed.config_file)

    return parsed, unparsed
