Function _env_file_callback

src/quart/cli.py:415–435

(
    ctx: click.Context, param: click.Option, value: str | None
)

def _env_file_callback(
    ctx: click.Context, param: click.Option, value: str | None
) -> str | None:
    if value is None:
        return None

    import importlib

    try:
        importlib.import_module("dotenv")
    except ImportError:
        raise click.BadParameter(
            "python-dotenv must be installed to load an env file.",
            ctx=ctx,
            param=param,
        ) from None

    # Don't check QUART_SKIP_DOTENV, that only disables automatically
    # loading .env and .quartenv files.
    load_dotenv(value)
    return value


# This option is eager so env vars are loaded as early as possible to be