Convert indicator from Tradingview.com site to mql4

I need to convert an indicator from Tradingview.com to mql4. Source code is provided. Indicator need to look same as in Tradinview and editable so you can "hide" some aspects of it in the chart.

1 study(title="EMA Scalper - Buy / Sell", shorttitle="EMA Scalper – B / S", overlay=true)
2 len = input(20, minval=1, title="Length")
3 src = input(close, title="Source")
4 out = ema(src, len)
5 plot(out, title="EMA", color=blue)
6 last8h = highest(close, 8)
7 lastl8 = lowest(close, 8)

9 plot(last8h, color=red, linewidth=2)
10 plot(lastl8, color=green, linewidth=2)


13 bearish = cross(close,out) == 1 and close[1] > close 
14 bullish = cross(close,out) == 1 and close[1] < close 

16 plotshape(bearish, color=red, style=shape.arrowdown, text="Sell", location=location.abovebar)
17 plotshape(bullish, color=green, style=shape.arrowup, text="Buy", location=location.belowbar)