gulpfile.js

var gulp  = require('gulp'),
    gutil = require('gulp-util'),
    browserSync = require('browser-sync').create(),
    ghPages = require('gulp-gh-pages'),
    sass = require('gulp-sass'),
    jshint     = require('gulp-jshint'),
    concat     = require('gulp-concat'),
    sourcemaps = require('gulp-sourcemaps'),

    input  = {
      'sass': 'source/scss/**/*.scss',
      'javascript': ['source/javascript/*.js'],
      'vendorjs': 'source/javascript/vendor/*.js',
      'html': ['source/*.html', 'source/*/*.html'],
      'audio': 'source/audio/*.mp3'
    },

    output = {
      'stylesheets': 'build/assets/stylesheets',
      'javascript': 'build/assets/javascript',
      'vendorjs': 'build/assets/javascript/vendor',
      'html': 'build',
      'audio': 'build/audio'
    };

/* run javascript through jshint */
gulp.task('jshint', function() {
  return gulp.src(input.javascript)
    .pipe(jshint())
    .pipe(jshint.reporter('jshint-stylish'));
});

/* compile scss files */
gulp.task('build-css', function() {
  return gulp.src('source/scss/**/*.scss')
    .pipe(sourcemaps.init())
    .pipe(sass().on('error', sass.logError))
    .pipe(sourcemaps.write())
    .pipe(gulp.dest(output.stylesheets));
});

/* copy html files  */
gulp.task('build-html', function(){
    return gulp.src(input.html)
        .pipe(gulp.dest(output.html));
});

/* copy html files  */
gulp.task('build-audio', function(){
    return gulp.src(input.audio)
        .pipe(gulp.dest(output.audio));
});

/* concat javascript files, minify if --type production */
gulp.task('build-js', function() {
  return gulp.src(input.javascript)
    .pipe(sourcemaps.init())
      .pipe(concat('main.js'))
      //only uglify if gulp is ran with '--type production'
      .pipe(gutil.env.type === 'production' ? uglify() : gutil.noop())
    .pipe(sourcemaps.write())
    .pipe(gulp.dest(output.javascript));
});

/* concat javascript files, minify if --type production */
gulp.task('build-vendorjs', function() {
  return gulp.src(input.vendorjs)
    .pipe(sourcemaps.init())
      .pipe(concat('vendor.js'))
      //only uglify if gulp is ran with '--type production'
      .pipe(gutil.env.type === 'production' ? uglify() : gutil.noop())
    .pipe(sourcemaps.write())
    .pipe(gulp.dest(output.vendorjs));
});

// deploy
gulp.task('deploy', function() {
  return gulp.src('build/**/*')
    .pipe(ghPages());
});

// Static server
gulp.task('browser-sync', function() {
    browserSync.init({
        server: {
            baseDir: "build"
        }
    });
});

/* Watch these files for changes and run the task on update */
gulp.task('watch', function() {
  gulp.watch(input.javascript, ['jshint', 'build-js']);
  gulp.watch(input.vendorjs, ['jshint', 'build-vendorjs']);
  gulp.watch(input.sass, ['build-css']);
  gulp.watch(input.html, ['build-html']);
});

/* run the watch task when gulp is called without arguments */
gulp.task('default', ['browser-sync', 'watch']);

gulp.task('build', ['build-js', 'build-vendorjs', 'build-css', 'build-html', 'jshint']);