start.js

// Core dependencies
const path = require('path');
const fs = require('fs');

checkFiles();

// Local dependencies
const usageData = require('./lib/usage_data');

// Get usageDataConfig from file, if exists
const usageDataConfig = usageData.getUsageDataConfig();

if (usageDataConfig.collectUsageData === undefined) {
  // No recorded answer, so ask for permission
  const promptPromise = usageData.askForUsageDataPermission();
  promptPromise.then(function (permissionGranted) {
    usageDataConfig.collectUsageData = permissionGranted;
    usageData.setUsageDataConfig(usageDataConfig);

    if (permissionGranted) {
      usageData.startTracking(usageDataConfig);
    }

    runGulp();
  });
} else if (usageDataConfig.collectUsageData === true) {
  // Opted in
  usageData.startTracking(usageDataConfig);
  runGulp();
} else {
  // Opted out
  runGulp();
}

// Warn if node_modules folder doesn't exist
function checkFiles() {
  const nodeModulesExists = fs.existsSync(
    path.join(__dirname, '/node_modules')
  );
  if (!nodeModulesExists) {
    console.error(
      'ERROR: Node module folder missing. Try running `npm install`'
    );
    process.exit(0);
  }

  // Create template .env file if it doesn't exist
  const envExists = fs.existsSync(path.join(__dirname, '/.env'));
  if (!envExists) {
    fs.createReadStream(path.join(__dirname, '/lib/template.env')).pipe(
      fs.createWriteStream(path.join(__dirname, '/.env'))
    );
  }
}

// Create template session data defaults file if it doesn't exist
const dataDirectory = path.join(__dirname, '/app/data');
const sessionDataDefaultsFile = path.join(
  dataDirectory,
  '/session-data-defaults.js'
);
const sessionDataDefaultsFileExists = fs.existsSync(sessionDataDefaultsFile);

if (!sessionDataDefaultsFileExists) {
  console.log('Creating session data defaults file');
  if (!fs.existsSync(dataDirectory)) {
    fs.mkdirSync(dataDirectory);
  }

  fs.createReadStream(
    path.join(__dirname, '/lib/template.session-data-defaults.js')
  ).pipe(fs.createWriteStream(sessionDataDefaultsFile));
}

// Run gulp
function runGulp() {
  const spawn = require('cross-spawn');

  process.env.FORCE_COLOR = 1;
  const gulp = spawn('node', [
    './node_modules/gulp/bin/gulp.js',
    '--log-level',
    '-L',
  ]);
  gulp.stdout.pipe(process.stdout);
  gulp.stderr.pipe(process.stderr);
  process.stdin.pipe(gulp.stdin);

  gulp.on('exit', function (code) {
    console.log('gulp exited with code ' + code.toString());
  });
}