def _parse_args():
    """Parse args and separate generator and playbook args."""
    class HelpOnErrorArgParser(argparse.ArgumentParser):
        """Print help message as well when an error is raised."""
        def error(self, message):
            sys.stderr.write("Error: %s\n" % message)
            self.print_help()
            sys.exit(2)

    def validate(_file):
        """Validate if the given target argument is a valid file or a valid directory"""
        _file = abspath(_file)
        if not exists(_file):
            if not exists(dirname(_file)):
                # Argparse uses the ArgumentTypeError to give a rejection message like:
                # error: argument input: x does not exist
                raise argparse.ArgumentTypeError("{0} does not exist".format(_file))
        return _file

    def expand_cg_args(cg_args):
        """Separate clubbed flags in command line args for the generator.py

        Allows flags to be clubbed like, -ilt example.txt.
        """
        expanded = list()
        for item in cg_args:
            if len(item) < 3:
                # If at all a flag, must be single flag
                expanded.append(item)
                continue
            if item.startswith("-"):
                if not item.startswith("--"):
                    for flag in item[1:]:
                        expanded.append('-' + flag)
                    continue
            expanded.append(item)
        return expanded

    class AssignDefaultIgnore(argparse.Action):
        """If argument is specified but nothing provided, use pre-defined.

        nargs="*" doesn't allow const and default kwarg can't be used as we might not want to
        ignore as well.
        """
        def __call__(self, parser, args, values, option_string=None):
            if values is not None and not len(values):
                values = IGNORE_METHODS
            setattr(args, self.dest, values)

    try:
        indx = sys.argv.index('--')
        cg_args, sys.argv = sys.argv[1:indx], sys.argv[:1] + sys.argv[indx + 1:]
    except ValueError:
        cg_args = []

    cg_args = expand_cg_args(cg_args)  # allow -il type of usage
    parser = HelpOnErrorArgParser(description=DESCRIPTION)
    parser.add_argument(
        "-l", "--long", action='store_true', default=False,
        help="File reference of method in call graph is absolute, i.e. starts with ansible, "
             "otherwise just the basename if not __init__.py")
    parser.add_argument(
        "-t", "--target", nargs="?", type=validate, const=TARGET_FILE, default=TARGET_FILE,
        help="Filepath to write call graph, defaults to %(default)s")
    parser.add_argument(
        "-i", "--ignore", nargs='*', action=AssignDefaultIgnore,
        help="Methods to ignore while generating call graph")
    # TODO: Aloow classes that can be intercepted
    parser.usage = \
        parser.format_usage()[len("usage: "):].rstrip() + " -- <ansible-playbook options>\n"
    cg_args = parser.parse_args(cg_args)

    if not len(sys.argv[1:]):
        parser.print_help()
        sys.exit(2)

    return cg_args
Parse args and separate generator and playbook args.