def save(self, filename=None):
        filename = Path(filename) if filename is not None else self.filename
        with filename.open("w") as f:
            f.write(self.yaml)
def __init__(self, m1, m2):
        super(xormatcher, self).__init__(m1._root, m1._cwd)
        self.traversedir = m1.traversedir
        self.m1 = m1
        self.m2 = m2