Convert Think Script to Pine Script on TradingView

I have a very simple ThinkScript (Thin or Swim) indicator that I want converted to pine script so that it can be used in the tradingview charts.
below is the code in thinkscript: this is a strategy

input price = close;
input length = 20;
input displace = 0;

plot HMA = MovingAverage(AverageType.HULL, price, length)[-displace];

HMA.DefineColor("Up", GetColor(1));
HMA.DefineColor("Down", GetColor(0));
HMA.AssignValueColor(if HMA > HMA[1] then HMA.color("Up") else HMA.color("Down"));

AddOrder(OrderType.BUY_AUTO, HMA > HMA[1]);
AddOrder(OrderType.SELL_AUTO, HMA < HMA[1]);

Alert(HMA > HMA[1] and HMA[1] < HMA[2], "BUY SIGNAL", Alert.BAR, Sound.Ring);
Alert(HMA < HMA[1] and HMA[1] > HMA[2], "SELL SIGNAL", Alert.BAR, Sound.Ring);