app.js

"use strict";

const CommandLine = require("./infrastructure/command_line");
const Rot13 = require("./logic/rot13");

module.exports = class App {

	constructor(commandLine, rot13) {
		this._commandLine = commandLine;
		this._rot13 = rot13;
	}

	run() {
		const args = this._commandLine.args();

		if (args.length === 0) {
			this._commandLine.writeOutput("Usage: run text_to_transform");
			return;
		}
		if (args.length !== 1) {
			this._commandLine.writeOutput("Too many arguments");
		}

		const input = args[0];
		const output = this._rot13.transform(input);
		this._commandLine.writeOutput(output);
	}

};