def make_enum(lib_prefix, enum_prefix=''):
    """Class decorator for automatically adding enum values.

    The values are read directly from the :attr:`spotify.lib` CFFI wrapper
    around libspotify. All values starting with ``lib_prefix`` are added. The
    ``lib_prefix`` is stripped from the name. Optionally, ``enum_prefix`` can
    be specified to add a prefix to all the names.
    """

    def wrapper(cls):
        for attr in dir(lib):
            if attr.startswith(lib_prefix):
                name = attr.replace(lib_prefix, enum_prefix)
                cls.add(name, getattr(lib, attr))
        return cls
    return wrapper