# indie:lang_version = 5
from indie import indicator, format, plot, color
from indie.algorithms import CumSum, NanToZero, NetVolume


@indicator('OBV', format=format.VOLUME)  # On Balance Volume
@plot.line(color=color.BLUE)
def Main(self):
    return CumSum.new(NanToZero.new(NetVolume.new(self.close)))[0]
    # TODO: implement smoothing when display.none is supported