Constellations/js/Grid/IO.js

import * as File from WTK.File;
import * as Async from UnitJS.Async;
import Grid;
import Grid.Color;
import Mode;

return {
	init: init
}

function init() {
	document.getElementById('load').addEventListener('click', load);
	document.getElementById('save').addEventListener('click', save);
}

function load() {
	Async.run(
		Async.bind(
			File.pick({accept: 'text/json,.json'}),
			function(input) {
				Grid.clear();
				Mode.setEnabled(false, ['play', 'solve']);
				return File.load(input.files[0]);
			},
			function(data) {
				Grid.Color.setColors(JSON.parse(data));
				return Async.wrap();
			}
		)
	);
}

function save() {
	File.save('data:text/json,' + JSON.stringify(Grid.get().colors), "grid.json");
}