Photoshop layer permutator

photoshop_cartesian.js

/**
 * Photoshop only accepts ExtendScript which is compliant to ECMA-262 (version 3)
 *
 * This script, when executed in Photoshop exports all the possible combinations of layers in the first group of the active activeDocument
 * For example:
 * If the top group has 2 subgroups, each having 2 layers
 * this script will export 4 pictures with the following layers being visible:
 * [0, 0]
 * [0, 1]
 * [1, 0]
 * [1, 1]
 *
 * If we look at this as a matrix then
 * each row represents a picture,
 * each column represents a subgroup
 * each number represents which layer is the only one visible in that particular subgroup for that picture.
 *
 * Make sure that the folder you want to save in exists!
 * It does not touch anything besides the first groups visibility settings, you can have your background below that
 * If you want something to always be on top then just make a subgroup for that and have only one layer in it
 *
 * (Protip: You can quickly get out of hands with the amount of produced pictures.
 * Just multiply together how many layers there are in each subgroup to know how many picture will be rendered)
 */

function cartesian(array) {
	var results = [[]];
	for (var i = 0; i < array.length; i++) {
		var currentSubArray = array[i];
		var temp = [];
		for (var j = 0; j < results.length; j++) {
			for (var k = 0; k < currentSubArray.length; k++) {
				temp.push(results[j].concat(currentSubArray[k]));
			}
		}
		results = temp;
	}
	return results;
}

function save(doc, saveFile) {
	var saveOptions = new PNGSaveOptions();
	saveOptions.compression = 2; // 0..9 (0 - without compression)
	saveOptions.interlaced = false;
	doc.saveAs(saveFile, saveOptions, true);
}

var stemsSet = app.activeDocument.layerSets[0];

var groupCount = stemsSet.layerSets.length;
var matrix = [];

for (var i = 0; i < groupCount; i++) {
	var layerSet = stemsSet.layerSets[i];
	var line = [];
	for (var j = 0; j < layerSet.layers.length; j++) {
		line.push(j);
	}
	matrix.push(line);
}

function hideAll() {
	for (var i = 0; i < groupCount; i++) {
		var layerSet = stemsSet.layerSets[i];
		for (var j = 0; j < layerSet.layers.length; j++) {
			var layer = layerSet.layers[j];
			layer.visible = false;
		}
	}
}

var cp = cartesian(matrix);

for (var index = 0; index < cp.length; index++) {
	var perm = cp[index];
	hideAll();
	var fPermName = '';
	for (var permi = 0; permi < perm.length; permi++) {
		fPermName = fPermName + perm[permi];
		stemsSet.layerSets[permi].layers[perm[permi]].visible = true;
	}

	save(
		app.activeDocument,
		new File('~/Desktop/perm/perm_' + fPermName + '.png')
	);
}

It's certainly not pretty, but does the job. This is all I could do practically blindly, with my hands tied.