Duplicate X.jsx

/**
 * Duplicate selected layer(s) a specified number of times
 * through a simple UI.
 *
 * @author github.com/idlepickle
 * @version 1.0
 */
function dupSelectLayers(e) {
	var t = app.project.activeItem;
	if (!(t instanceof CompItem)) {
		alert("No active composition selected.");
		return
	}
	var o = t.selectedLayers;
	if (0 === o.length) {
		alert("No layers selected.");
		return
	}
	for (var n = 0; n < e; n++)
		for (var a = 0; a < o.length; a++) o[a].duplicate();
	alert("Selected layer(s) duplicated " + e + " times.")
}

function showUI() {
	var e = new Window("dialog", "Duplicate Selected Layers");
	e.add("statictext", void 0, "Number of Duplicates:");
	var t = e.add("edittext", void 0, "2");
	t.characters = 5, t.active = !0;
	var o = e.add("group"),
		n = o.add("button", void 0, "OK"),
		a = o.add("button", void 0, "Cancel"),
		i = {
			duplicationCount: null
		};
	return n.onClick = function() {
		var o = parseInt(t.text, 10);
		if (isNaN(o) || o < 1) {
			alert("Please enter a valid number of duplicates (1 or more).");
			return
		}
		i.duplicationCount = o, e.close()
	}, a.onClick = function() {
		e.close()
	}, e.show(), i
}

function main() {
	app.beginUndoGroup("Duplicate Selected Layers");
	var e = app.project.activeItem;
	if (!(e instanceof CompItem)) {
		alert("No active composition selected."), app.endUndoGroup();
		return
	}
	if (0 === e.selectedLayers.length) {
		alert("Select layer(s) first."), app.endUndoGroup();
		return
	}
	var t = showUI();
	if (null === t.duplicationCount) {
		app.endUndoGroup();
		return
	}
	dupSelectLayers(t.duplicationCount), app.endUndoGroup()
}
main();