A little Hack Man run script for Windows

hackman.js

const fs = require('fs');
const spawn = require('child_process').spawn;

if (process.argv.length !== 3) throw new Error('Usage: node app.js <wrapper-commands file>');

var runMatch = function(wrapperCommandsFile) {
    return new Promise(function(resolve, reject) {
        fs.readFile(wrapperCommandsFile, 'utf8', function(error, data) {
            if (error) reject(error);

            var config = JSON.parse(data);
            var cmd = spawn('java', ['-jar', 'engine/game-wrapper.jar', data]);

            var stdout = [];
            cmd.stdout.on('data', function(data) {
                data = data.toString();
                if (data.trim() !== '') stdout.push(data.trim());
            });

            cmd.on('error', function(error) {
                reject(error);
            });

            cmd.on('close', function(code) {
                if (code !== 0) reject(new Error('The engine process exited with code ' + code));

                resolve(stdout.join('\n'));
            });
        });
    });
};

// Basic usage
runMatch(process.argv[2]).then(function(stdout) {
    console.log(stdout);
}).catch(function(error) {
    console.error('Something went wrong: ' + error.message);
});