from typing import Callable
from typing import Optional
from typing import Tuple

import flask


def url_for(value: str, filename: Optional[str] = None) -> str:
    """Wrapper around :func:`flask.url_for` to expose the functionality in a template"""

    if filename:
        return flask.url_for(value, filename=filename)
    return flask.url_for(value)


FILTERS: Tuple[Callable, ...] = (url_for,)