Countdown Timer

// COUNTDOWN TIMER
// Apply to Source Text
// === SETTINGS ===
countdownFrom = 10;    // seconds to count down from
showMinutes = false;   // true for MM:SS format
showMillis = false;    // true for decimal seconds
holdAtZero = true;     // true = stop at 0, false = go negative

// === COUNTDOWN LOGIC ===
remaining = countdownFrom - time;
if (holdAtZero && remaining < 0) remaining = 0;

// Handle negative (count up after zero)
isNegative = remaining < 0;
remaining = Math.abs(remaining);

min = Math.floor(remaining / 60);
sec = Math.floor(remaining % 60);
millis = Math.floor((remaining % 1) * 100);

function pad(n, digits) {
    s = "" + n;
    while (s.length < digits) s = "0" + s;
    return s;
}

// Build output
result = "";
if (isNegative) result += "-";
if (showMinutes) {
    result += pad(min, 2) + ":" + pad(sec, 2);
} else {
    result += Math.floor(remaining);
}
if (showMillis) result += "." + pad(millis, 2);

result