Gottwik/Enduro

// * ———————————————————————————————————————————————————————— * //
// *     JS Task
// *    Transpile ES6 to JS
// * ———————————————————————————————————————————————————————— * //
const js_handler = function () {}

// * vendor dependencies
const babel = require('gulp-babel')
const rename = require('gulp-rename')
const uglify = require('gulp-uglify')
const gulpif = require('gulp-if')
const sourcemaps = require('gulp-sourcemaps')
const Promise = require('bluebird')
const fs = Promise.promisifyAll(require('fs-extra'))

// * enduro dependencies
const flat_helpers = require(enduro.enduro_path + '/libs/flat_db/flat_helpers')
const logger = require(enduro.enduro_path + '/libs/logger')

js_handler.prototype.init = function (gulp, browser_sync) {

    // stores task name
    const js_handler_task_name = 'js';
    gulp.task(js_handler_task_name, function() {
        if (enduro.config.babel || enduro.config.uglify) {
            logger.timestamp('JS compiling started', 'enduro_events')
            const babelConfig = enduro.config.babel || {
                presets: ['es2015']
            }
            return gulp.src([enduro.project_path + '/assets/js/*.js',
                            '!' + enduro.project_path + '/assets/js/*.min.js',
                            '!' + enduro.project_path + '/assets/js/handlebars.js'])
                .pipe(sourcemaps.init())
                .pipe(gulpif(enduro.config.babel, babel(babelConfig)))
                .on('error', function (err) {
                    logger.err_blockStart('JS error')
                    logger.err(err.message)
                    logger.err_blockEnd()
                    this.emit('end')
                })
                .pipe(sourcemaps.write())
                .pipe(gulp.dest(enduro.project_path + '/' + enduro.config.build_folder + '/assets/js'))
                .pipe(browser_sync.stream())
                .on('end', () => {
                    logger.timestamp('JS compiling finished', 'enduro_events')
                })
                .pipe(gulpif(enduro.config.uglify, rename({ suffix: '.min' })))
                .pipe(gulpif(enduro.config.uglify, uglify()))
                .pipe(gulp.dest(enduro.project_path + '/' + enduro.config.build_folder + '/assets/js'))
        } else {
            logger.timestamp('js compiling not enabled, add babel options to enduro.json to enable')
            const copy_from = enduro.project_path + '/assets/js'
            const copy_to = enduro.project_path + '/' + enduro.config.build_folder + '/assets/js'
            return flat_helpers.dir_exists(copy_from)
                .then(() => {
                    return fs.copyAsync(copy_from, copy_to, { overwrite: true })
                }, () => {})
        }
    })

    return js_handler_task_name;
}

module.exports = new js_handler()