Heiken-Ashi watchlist for inside candles

Here you go...

def haClose = ohlc4;
def haOpen = if haOpen[1] == 0 then haClose[1] else (haOpen[1] + haClose[1]) / 2;
def haHigh = Max(high, Max(haClose, haOpen));
def haLow = Min(low, Min(haClose, haOpen));
def haGreen = haClose > haOpen;
def haRed = haClose < haOpen;
def haInside = haHigh < haHigh[1] and haLow > haLow[1];
AddLabel(yes, if haInside then "HA Inside" else " ", Color.BLACK);
AssignBackgroundColor(if haGreen then Color.GREEN else if haRed then Color.RED else Color.CURRENT);