TradingView Pine Script indicator for Pivot points and Support-Resistance lines

pivot-sr.pine

//@version=5
indicator("Pivot SRs", overlay=true)

lookback = input.int(12, "Lookaround bars")
number_of_lines = input.int(5, "Lines to keep")

getLastNonNaInfo(series) =>
    float lastValue = na
    int lastIndex = na
    for i = 0 to 1000  // Adjust the range as necessary
        if not na(series[i])
            lastValue := series[i]
            lastIndex := bar_index[i]
            break  // Exit loop after finding the last non-na value
    [lastValue, lastIndex]

ph = ta.pivothigh(high, lookback, lookback)
pl = ta.pivotlow(low, lookback, lookback)

combined = nz(na(ph)) ? pl : ph
plotshape(ph, title="Highs", color=color.red, style=shape.triangledown, size=size.tiny, offset=-lookback, location=location.abovebar)
plotshape(pl, title="Lows", color=color.green, style=shape.triangleup, size=size.tiny, offset=-lookback, location=location.belowbar)

var line[] lines = array.new_line(0)
[last_pl, last_pl_bar] = getLastNonNaInfo(pl)
[last_ph, last_ph_bar] = getLastNonNaInfo(ph)
if (not na(ph))
    ph_line = line.new(last_bar_index, high[lookback], last_ph_bar - lookback, high[lookback], color=color.orange, extend=extend.left)
    array.unshift(lines, ph_line)
if (not na(pl))
    pl_line = line.new(last_bar_index, low[lookback], last_pl_bar - lookback, low[lookback], color=color.orange, extend=extend.left)
    array.unshift(lines, pl_line)
if (array.size(lines) >= number_of_lines)
    line.delete(array.pop(lines))  // Remove the oldest line first if there are already two lines

var label[] labels = array.new_label(0)
if (not na(ph))
    ph_label = label.new(bar_index - lookback, high[lookback], str.tostring(high[lookback],"#.##"), style=label.style_none, yloc=yloc.abovebar, textcolor = color.white)
    array.unshift(labels, ph_label)
if (not na(pl))
    pl_label = label.new(bar_index - lookback, low[lookback], str.tostring(low[lookback],"#.##"), style=label.style_none, yloc=yloc.belowbar, textcolor = color.white)
    array.unshift(labels, pl_label)
if (array.size(labels) > number_of_lines)
    label.delete(array.pop(labels))