gulpfile.js

'use strict';

var gulp = require('gulp'),
    watch = require('gulp-watch'),
    postcss = require('gulp-postcss'),
    autoprefixer = require('autoprefixer'),
    uglify = require('gulp-uglify'),
    sass = require('gulp-sass'),
    wait = require("gulp-wait"),
    cssnano = require('cssnano'),
    notify = require("gulp-notify"),
    rigger = require('gulp-rigger'),
    imagemin = require('gulp-imagemin'),
    rimraf = require('rimraf'),
    plumber = require('gulp-plumber'),
    browserSync = require("browser-sync"),
    reload = browserSync.reload;

var path = {
    build: {
        html: 'build/',
        js: 'build/js/',
        css: 'build/css/',
        img: 'build/img/',
        fonts: 'build/fonts/',
        libs: 'build/libs/'
    },
    src: {
        html: 'src/*.html',
        js: 'src/js/main.js',
        style: 'src/style/main.scss',
        img: 'src/img/**/*.*',
        fonts: 'src/fonts/**/*.*',
        libs: 'src/libs/**/*.*'
    },
    watch: {
        html: 'src/**/*.html',
        js: 'src/js/**/*.js',
        style: 'src/style/**/*.scss',
        img: 'src/img/**/*.*',
        fonts: 'src/fonts/**/*.*',
        libs: 'src/libs/**/*.*'
    },
    clean: './build'
};

var config = {
    server: {
        baseDir: "./build"
    },
    host: 'localhost',
    port: 9000,
    open: false, 
    logPrefix: "KingZ"
};

gulp.task('webserver', function () {
    browserSync(config);
});

gulp.task('clean', function (cb) {
    rimraf(path.clean, cb);
});

gulp.task('html:build', function () {
    gulp.src(path.src.html) 
        .pipe(rigger())
        .pipe(gulp.dest(path.build.html))
        .pipe(browserSync.stream());
});

gulp.task('js:build', function () {
    gulp.src(path.src.js)
        .pipe(plumber())
        .pipe(rigger())
        .pipe(uglify())
        .pipe(gulp.dest(path.build.js))
        .pipe(reload({stream: true}));
});

gulp.task('style:build', function () {
    var processors = [
      autoprefixer({browsers: ['last 40 version']}),
      cssnano
    ];
    gulp.src(path.src.style)
        .pipe(wait(500))
        .pipe(sass().on("error", notify.onError()))
        .pipe(postcss(processors))
        .pipe(gulp.dest(path.build.css))
        .pipe(reload({stream: true}));
});

gulp.task('image:build', function () {
    gulp.src(path.src.img) 
        .pipe(imagemin([
            // imagemin.gifsicle({interlaced: true}),
            // imagemin.jpegtran({progressive: true}),
            // imagemin.optipng({optimizationLevel: 5}),
            imagemin.svgo({
                plugins: [
                    {removeViewBox: true},
                    {cleanupIDs: false}
                ]
            })
        ]))
        .pipe(gulp.dest(path.build.img))
        .pipe(reload({stream: true}));
});

gulp.task('fonts:build', function() {
    gulp.src(path.src.fonts)
        .pipe(gulp.dest(path.build.fonts))
});

gulp.task('libs:build', function() {
    gulp.src(path.src.libs)
        .pipe(gulp.dest(path.build.libs))
});

gulp.task('build', [
    'html:build',
    'js:build',
    'style:build',
    'fonts:build',
    'libs:build',
    'image:build'
]);

gulp.task('watch', function(){
    watch([path.watch.html], function(event, cb) {
        gulp.start('html:build');
    });
    watch([path.watch.style], function(event, cb) {
        gulp.start('style:build');
    });
    watch([path.watch.js], function(event, cb) {
        gulp.start('js:build');
    });
    watch([path.watch.img], function(event, cb) {
        gulp.start('image:build');
    });
    watch([path.watch.fonts], function(event, cb) {
        gulp.start('fonts:build');
    });
    watch([path.watch.libs], function(event, cb) {
        gulp.start('libs:build');
    });
});

gulp.task('default', ['build', 'webserver', 'watch']);