Introducing kScript v2

//@version=2

// Indicator definition
define(title="RSI", position="offchart", axis=true);

// Customizable user inputs
var splineColors = input(name="myColor", type="color", defaultValue="orange");
var width = input(name="width", type="number", defaultValue=2);
var period = input(name="period", type="number", defaultValue=26);
var smooth = input(name="smooth", type="boolean", defaultValue=true);

// Data subscription - load OHLCV data from the current chart
timeseries trade = ohlcv(symbol=currentSymbol, exchange=currentExchange);

// Local variable
var fill = true;

// Create RSI time series using the built-in technical indicator function "rsi()"
// The close price is accessed through trade.close property
var transformedData = rsi(source=trade.close, period=period);

// Prepare final plot data
var baseLine = 0;
var combinedData = [transformedData, baseLine];

// Actually plot the data
// Plot an area spline with baseline and RSI values
// Use "transparent" as the second line's color so it's hidden
plotLine(value=combinedData, colors=[splineColors, "transparent"], width=width, fill=fill, smooth=smooth, label=["RSI"], desc=["Relative Strength Index"]);