Gulpfile.js

////////////////////////////////////////////////////////////////////////////////////
// Imports
////////////////////////////////////////////////////////////////////////////////////
'use strict';

var gulp = require('gulp');
var babel = require('gulp-babel');
var mocha = require('gulp-mocha');
var runSequence = require('run-sequence');
var rimraf = require('gulp-rimraf');
var eslint = require('gulp-eslint');
var spawn = require('child_process').spawn;
var browserify = require('gulp-browserify');
var deploy = require('gulp-gh-pages');
var cp = require('child_process');
var jekyll = process.platform === 'win32' ? 'jekyll.bat' : 'jekyll';

var node;

////////////////////////////////////////////////////////////////////////////////////
// Tasks
////////////////////////////////////////////////////////////////////////////////////

gulp.task('build-js', function () {
  return gulp.src(['src/javascript/**/*.js', '!src/javascript/conf/config.js'])
  .pipe(babel())
  .pipe(gulp.dest('build'));
});

gulp.task('build-sources', function (callback) {
  runSequence('build-js', callback);
});

gulp.task('copy-assets', function () {
  return gulp.src(['src/assets/**/*'])
    .pipe(gulp.dest('build/public/'));
});

gulp.task('clean-build', function () {
  return gulp.src('build', {read: false})
  .pipe(rimraf());
});

// Default gulp task
gulp.task('default', function (callback) {
  runSequence('build', callback);
});

gulp.task('eslint', function () {
  return gulp.src(['**/*.js', '!node_modules/**', '!build/**'])
    .pipe(eslint())
    .pipe(eslint.format())
    .pipe(eslint.failAfterError());
});

gulp.task('exec', function () {
  if (node) node.kill();

  node = spawn('node', ['build/main.js'], {stdio: 'inherit'})
  node.on('close', function (code) {
    if (code === 8) {
      gulp.log('Error detected, waiting for changes...');
    }
  });
});

gulp.task('browserify', function () {
  return gulp.src(['build/exports.js'])
    .pipe(browserify({
      insertGlobals: true,
      debug: !gulp.env.production
    }))
    .pipe(gulp.dest('./build/public/js/'))
});

gulp.task('build', ['clean-build'], function (callback) {
  runSequence('build-sources', 'copy-assets', callback);
});

gulp.task('build-for-web', function (callback) {
  runSequence('build', 'browserify', callback);
});

/**
 * Tests
 */

gulp.task('copy-test-data', function () {
  return gulp.src('test/data/**/*')
  .pipe(gulp.dest('build/test/data'));
});

gulp.task('build-tests', ['copy-test-data'], function () {
  return gulp.src('test/**/*.js')
  .pipe(babel())
  .pipe(gulp.dest('build/test'));
});

gulp.task('mocha-tests', ['build-tests'], function () {
  return gulp.src(['build/test/*Test.js'])
  .pipe(mocha({timeout: 5000}))
  .once('error', function (err) {
    console.log(err);
    process.exit(1);
  })
  .once('end', function () {
    process.exit(0);
  });
});

gulp.task('launch-tests', function (callback) {
  runSequence('build', 'build-tests', 'mocha-tests', callback);
});

/**
 * Watch
 */

gulp.task('watch', ['build'], function (callback) {
  runSequence('exec', callback);

    // Build my sources
    gulp.watch(['src/javascript/**/*.js'], ['build-sources']);

    // Note: try wrapping in a function if getting an error like `TypeError: Bad argument at TypeError (native) at
    // ChildProcess.spawn`
    gulp.watch('build/main.js', function () {
      runSequence('exec', callback);
    });
});

/**
 * Build the Jekyll Site
 */

gulp.task('jekyll-clean', function () {
  return gulp.src('_site', {read: false})
  .pipe(rimraf());
});

gulp.task('jekyll-build', ['jekyll-clean', 'build-for-web'], function (done) {
    return cp.spawn(jekyll, ['build'], {stdio: 'inherit'})
        .on('close', done);
});

gulp.task('deploy', ['jekyll-build'], function () {
    return gulp.src('./build/public/**/*')
        .pipe(deploy());
});