No Repaint

//@version=4
study("", "", true)
repaint = input(true)

greenCandle = (close > open)
redCandle = (close < open)
greenCandle1 = (close[1] > open)
redCandle1 = (close[1] < open)
longEma = ema(close, 21)

enterVol = volume > (volume[1] * 2)
exitVol = volume[1] > (volume[2] * 2)
shortVol = volume > (volume[1] * 2)

enterLong = greenCandle and enterVol and longEma
exitLong = redCandle and redCandle1 and exitVol
enterShort = redCandle and redCandle1 and shortVol

long = greenCandle and enterVol and longEma
short = redCandle and redCandle1 and shortVol

ofst = repaint or not barstate.islast ? 0 : 1
pos = 0.0
pos:= long? 1 : short? -1 : pos[1]
longCond = (long and pos[1]!= 1)[ofst]
shortCond = (short and pos[1]!= -1)[ofst]


long_exit = (redCandle and redCandle1 and exitVol and pos[1]==1)[ofst]

if long_exit
	pos:=0

// Chart Plot & Alerts
plotshape(longCond,  color=color.green, style=shape.triangleup, text="Buy" , location=location.belowbar, transp=0, offset=0, size=size.tiny)
plotshape(shortCond, color=color.red, style=shape.triangledown, text="Sell", location=location.abovebar, transp=0, offset=0, size=size.tiny)
alertcondition(longCond , title="Enter Long" )
alertcondition(shortCond, title="Enter Short")

plotshape(long_exit,  color=color.purple, style=shape.xcross, location=location.abovebar, transp=0, offset=0, size=size.tiny)
alertcondition(long_exit , title="Exit Long" )