getMaybeNextLineB :: Direction -> BufferM (Maybe YiString)
getMaybeNextLineB dir = listToMaybe <$> lineStreamB dir
getMaybeNextLineB :: Direction -> BufferM (Maybe YiString)
getMaybeNextLineB dir = listToMaybe <$> lineStreamB dir
getMaybeNextLineB dir = listToMaybe <$> lineStreamB dir