Inside Day Detector

//version=5
indicator("Inside Day Detector", overlay=true)

// Yesterday's High & Low
prevHigh = high[1]
prevLow = low[1]

// Inside Day condition
insideDay = high < prevHigh and low > prevLow

// Plot marker
plotshape(insideDay, title="Inside Day", style=shape.triangleup, location=location.abovebar, size=size.small)

// Alert
alertcondition(insideDay, title="Inside Day Alert", message="Inside Day detected on {{ticker}}")