thing.js

var Jimp = require("jimp"); // load image manipulator
var plist = require("plist"); // load plist parser
var fs = require("fs"); // load filesystem

var selected = "spider_02"; // INPUT change value for different icons
var COL1 = [255, 0, 0];
var COL2 = [255, 255, 0];

var inputData = plist.parse(fs.readFileSync("./input.plist", "utf8")); // parse plist
var data = inputData.frames; // get frames
var list = Object.keys(inputData.frames).filter(removeShit); // get all item names

var items = list.filter(family,selected).reverse(); // flip the array. Main layer last

// find legs
var legs = items.filter(findLegs);
if (legs.length != 0) {
	legs.forEach(element => {
		items.splice(items.indexOf(element), 1);
	});
	items = items.concat(legs);
};

var firstLeg = items.filter(findFirstLeg).reverse();
if (firstLeg.length != 0) {
	firstLeg.forEach(element => {
		items.unshift(element.replace("001", "002"));
		items.unshift(element.replace("001", "003"));
	});
};

var middleLeg = items.filter(findMiddleLeg).reverse();
if (middleLeg.length != 0) {
	middleLeg.forEach(element => {
		items.splice(items.indexOf(element), 1);
		items.unshift(element);
	});
};

var lastLeg = items.filter(findLastLeg).reverse();
if (lastLeg.length != 0) {
	lastLeg.forEach(element => {
		items.splice(items.indexOf(element), 1);
		items.unshift(element);
	});
};

// check if extra image exists if so push extra to the end of array
var extra = items.filter(findExtra);
if (extra.length != 0) {
	extra.forEach(element => {
		items.splice(items.indexOf(element), 1);
	});
	items = items.concat(extra);
};

// generate new transparent blank image
var image = new Jimp(200, 100, 0x00000000, function(err, image) {
	// read the spritesheet
	Jimp.read("input.png", function(err, spritesheet) {

		// for each part of the sprite
		items.forEach((element, i) => {
			var z = spritesheet.clone();

			var original = element;
			var element = element.replace("002", "001").replace("003", "001");

			var x = transform(data[element].textureRect)[0][0];
			var y = transform(data[element].textureRect)[0][1];

			var sw = transform(data[element].spriteSize)[0];
			var sh = transform(data[element].spriteSize)[1];

			var ox = transform(data[element].spriteOffset)[0];
			var oy = transform(data[element].spriteOffset)[1];

			if (data[element].textureRotated) {
				var h = transform(data[element].textureRect)[1][0];
				var w = transform(data[element].textureRect)[1][1];
			} else {
				var w = transform(data[element].textureRect)[1][0];
				var h = transform(data[element].textureRect)[1][1];
			};

			z.crop(x, y, w, h);

			if (data[element].textureRotated) {
				z.rotate(-90);
			};

			if ( original.includes("002") || original.includes("003")) {
				z.brightness(-0.5);
			}

			z.resize(sw, sh);

			// leg offset handling robot
			if (element.includes(selected + "_02_") && element.includes("robot_")) {
				ox = ox - 20;
				oy = oy - 10;
				z.rotate(45);
			} else if (element.includes(selected + "_03_") && element.includes("robot_")) {
				ox = ox - 15;
				oy = oy - 30;
				z.rotate(-45);
			} else if (element.includes(selected + "_04_") && element.includes("robot_")) {
				ox = ox;
				oy = oy - 32;
			};

			// leg offset handling spider
			if (element.includes(selected + "_02_") && element.includes("spider_") && original.includes("002")) {
				ox = ox + 9;
				oy = oy - 19;
			} else if (element.includes(selected + "_02_") && element.includes("spider_") && original.includes("003")) {
				ox = ox + 29;
				oy = oy - 19;
				z.flip(true, false);
			} else if (element.includes(selected + "_02_") && element.includes("spider_")) {
				ox = ox - 8;
				oy = oy - 19;
			} else if (element.includes(selected + "_03_") && element.includes("spider_")) {
				ox = ox - 43;
				oy = oy - 19;

				// crap spider is crap
				if (selected == "spider_07") {
					ox = ox + 10;
					oy = oy + 8;
				}
				// crap layer 2 handling
				if (h < 11) {
					ox = ox + 10;
				} else if (h < 20 && w < 14) {
					ox = ox + 9
					oy = oy - 4
				};
				z.rotate(45);
			} else if (element.includes(selected + "_04_") && element.includes("spider_")) {
				ox = ox - 15;
				oy = oy - 10;
			};

			px = sw / 2;
			py = sh / 2;

			console.log(x, y, w, h, sw, sh, ox, oy, element);

			image.composite(z, 100 - px + ox, 50 - py - oy);
		});

		image
			.autocrop()
			.write("out.png");
	});
});

function family(value) {
	return value.includes(this);
};

function removeShit(value) {
	return !value.includes("_glow_");
};

function findExtra(value) {
	return value.includes("_extra_");
};

function findLegs(value) {
	return (value.includes(selected + "_02_") && (value.includes("robot_") || value.includes("spider_"))) ||
		(value.includes(selected + "_03_") && (value.includes("robot_") || value.includes("spider_"))) ||
		(value.includes(selected + "_04_") && (value.includes("robot_") || value.includes("spider_")));
};

function findMiddleLeg(value) {
	return value.includes(selected + "_03_") && value.includes("robot_");
}

function findFirstLeg(value) {
	return value.includes(selected + "_02_") && value.includes("spider_") && !value.includes("extra");
}

function findLastLeg(value) {
	return value.includes(selected + "_04_") && value.includes("spider_");
}

function transform(val) {
	return JSON.parse(val.replace(/{/g, "[").replace(/}/g, "]"));
};