check-for-updates.js
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check-for-updates.js
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	"use strict";
	const locreq = require("locreq")(__dirname);
	const request = require("request-promise");
	const Errors = locreq("lib/response/error.js");

	function check_for_updates(Logger){
	const pkg = require(locreq.resolve("./package.json"));
	if (typeof pkg === "object"){
	const pkg_split = pkg.version.split(".");
	const version = `${pkg_split[0] }.${ pkg_split[1]}`;
	const url = `http://registry.npmjs.org/sealious/${ version}`;
	let status = "warning";
	let message;

	return request(url)
	.then(res => JSON.parse(res))
	.then(function(sealious_npm){
	if (sealious_npm.error){
	message = `npm registry error when requesting info for version ${version}: ${sealious_npm.error}`;
	} else if (!sealious_npm.version \|\| sealious_npm === undefined){
	message = `unknown npm registry error when requesting info for version ${version}`;
	} else {
	const sealious_npm_array = sealious_npm.version.split(".");
	if ((sealious_npm.version !== pkg.version) && (parseInt(sealious_npm_array[2]) > parseInt(pkg_split[2]))){
	message = `Sealious@${pkg.version} - update available. Run "npm install sealious@${sealious_npm.version}" to update.`;
	} else {
	status = "info";
	message = `Sealious@${pkg.version} is up-to-date`;
	}
	}
	return {status, message};
	})
	.catch(function(err){
	Logger.warning("No network connection available! Unable to fetch information about Sealious updates.");
	throw err;
	});
	} else {
	throw new Errors.ValidationError("Wrong arguments!");
	}
	}

	module.exports = check_for_updates;