gulpfile.js

'use strict';

var gulp = require('gulp');
var del = require('del');

// Load plugins
var $ = require('gulp-load-plugins')();
var browserify = require('browserify');
var watchify = require('watchify');
var source = require('vinyl-source-stream'),

    sourceFile = './app/scripts/app.js',

    destFolder = './dist/scripts',
    destFileName = 'app.js';

var browserSync = require('browser-sync');
var reload = browserSync.reload;

// Styles
gulp.task('styles', ['sass', 'moveCss']);

gulp.task('moveCss',['clean'], function(){
  // the base option sets the relative root for the set of files,
  // preserving the folder structure
  gulp.src(['./app/styles/**/*.css'], { base: './app/styles/' })
  .pipe(gulp.dest('dist/styles'));
});

gulp.task('sass', function() {
    return $.rubySass('./app/styles', {
            style: 'expanded',
            precision: 10,
            loadPath: ['app/bower_components']
        })
        .pipe($.autoprefixer('last 1 version'))
        .pipe(gulp.dest('dist/styles'))
        .pipe($.size());
});


var bundler = watchify(browserify({
    entries: [sourceFile],
    debug: true,
    insertGlobals: true,
    cache: {},
    packageCache: {},
    fullPaths: true
}));

bundler.on('update', rebundle);
bundler.on('log', $.util.log);

gulp.task('fonts', function() {
  return gulp.src(require('main-bower-files')({
    filter: '**/*.{eot,svg,ttf,woff,woff2}'
  }).concat('app/fonts/**/*')).pipe(gulp.dest('dist/fonts'));
});



function rebundle() {
  return bundler.bundle()
      // log errors if they happen
      .on('error', $.util.log.bind($.util, 'Browserify Error'))
      .pipe(source(destFileName))
      .pipe(gulp.dest(destFolder))
      .on('end', function() {
          reload();
      });
}

// Scripts
gulp.task('scripts', rebundle);

gulp.task('buildScripts', function() {
    return browserify(sourceFile)
        .bundle()
        .pipe(source(destFileName))
        .pipe(gulp.dest('dist/scripts'));
});

// Images
gulp.task('images', function() {
    return gulp.src('app/images/**/*')
        .pipe($.cache($.imagemin({
            optimizationLevel: 3,
            progressive: true,
            interlaced: true
        })))
        .pipe(gulp.dest('dist/images'))
        .pipe($.size());
});

// Clean
gulp.task('clean', function(cb) {
    $.cache.clearAll();
    cb(del.sync(['dist/styles', 'dist/scripts', 'dist/images']));
});

// Bundle
gulp.task('bundle', ['styles', 'scripts']);

gulp.task('buildBundle', ['styles', 'buildScripts']);

// Robots.txt and favicon.ico
gulp.task('extras', function() {
    return gulp.src(['app/*.txt', 'app/*.ico'])
        .pipe(gulp.dest('dist/'))
        .pipe($.size());
});

// Watch
gulp.task('watch', ['bundle', 'images'], function() {

    browserSync({
        notify: false,
        logPrefix: 'BS',
        // Run as an https by uncommenting 'https: true'
        // Note: this uses an unsigned certificate which on first access
        //       will present a certificate warning in the browser.
        // https: true,
        server: ['./']
    });

    gulp.watch(['app/styles/**/*.scss', 'app/styles/**/*.css'], ['styles', 'scripts', reload]);
});

// Build
gulp.task('build', ['buildBundle', 'images', 'extras', 'fonts'], function() {
    gulp.src('dist/scripts/app.js')
        .pipe($.uglify())
        .pipe($.stripDebug())
        .pipe(gulp.dest('dist/scripts'));
});

// Default task
gulp.task('default', ['clean', 'build']);