MACD Crossover (tutorial)

//@version=6
//
// PineForge tutorial — MACD line/signal crossover.
//
// This is the original Pine v6 source the tutorial is built around.
// It is kept here for reference only; PineForge ships its compiler
// closed-source, so the actual backtest binary is built from the
// sibling generated.cpp (which mirrors the engine bytecode this Pine
// would produce). Read both side-by-side to see how each Pine line
// maps onto the runtime API.
//
strategy("MACD Crossover (tutorial)",
     overlay            = false,
     initial_capital    = 1000000,
     currency           = currency.USD,
     process_orders_on_close = false,
     pyramiding         = 1,
     commission_type    = strategy.commission.percent,
     commission_value   = 0,
     slippage           = 0,
     default_qty_type   = strategy.fixed,
     default_qty_value  = 1)

// === Inputs ===
fastLen   = input.int(12, "Fast Length",   minval=1)
slowLen   = input.int(26, "Slow Length",   minval=1)
signalLen = input.int(9,  "Signal Length", minval=1)
src       = input.source(close, "Source")

// === MACD ===
[macdLine, signalLine, histLine] = ta.macd(src, fastLen, slowLen, signalLen)

// === Signals ===
longCond  = ta.crossover(macdLine,  signalLine)
shortCond = ta.crossunder(macdLine, signalLine)

// === Entries ===
if longCond
    strategy.entry("Long",  strategy.long)
if shortCond
    strategy.entry("Short", strategy.short)

plot(histLine,   "Histogram", style=plot.style_histogram, color=histLine >= 0 ? color.green : color.red)
plot(macdLine,   "MACD",      color=color.blue)
plot(signalLine, "Signal",    color=color.orange)