# vim: set fileencoding=utf-8 :

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# Copyright (c) 2016 Idiap Research Institute, http://www.idiap.ch/           #
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from functools import wraps

import click


def raise_on_error(view_func):
    """Raise a click exception if returned value is not zero.

    Click exits successfully if anything is returned, in order to exit properly
    when something went wrong an exception must be raised.
    """

    def _decorator(*args, **kwargs):
        value = view_func(*args, **kwargs)
        if value not in [None, 0]:
            exception = click.ClickException("Error occured")
            exception.exit_code = value
            raise exception
        return value
    return wraps(view_func)(_decorator)