gulpfile.js

const pkg = require('./package.json')
const path = require('path')
const glob = require('glob')
const yargs = require('yargs')
const colors = require('colors')
const qunit = require('node-qunit-puppeteer')

const { rollup } = require('rollup')
const { terser } = require('rollup-plugin-terser')
const babel = require('@rollup/plugin-babel').default
const commonjs = require('@rollup/plugin-commonjs')
const resolve = require('@rollup/plugin-node-resolve').default

const gulp = require('gulp')
const tap = require('gulp-tap')
const zip = require('gulp-zip')
const sass = require('gulp-sass')
const header = require('gulp-header')
const eslint = require('gulp-eslint')
const minify = require('gulp-clean-css')
const connect = require('gulp-connect')
const autoprefixer = require('gulp-autoprefixer')

const root = yargs.argv.root || '.'
const port = yargs.argv.port || 8000

const banner = `/*!
* reveal.js ${pkg.version}
* ${pkg.homepage}
* MIT licensed
*
* Copyright (C) 2020 Hakim El Hattab, https://hakim.se
*/\n`

// Prevents warnings from opening too many test pages
process.setMaxListeners(20);

const babelConfig = {
    babelHelpers: 'bundled',
    ignore: ['node_modules'],
    compact: false,
    extensions: ['.js', '.html'],
    plugins: [
        'transform-html-import-to-string'
    ],
    presets: [[
        '@babel/preset-env',
        {
            corejs: 3,
            useBuiltIns: 'usage',
            modules: false
        }
    ]]
};

// Our ES module bundle only targets newer browsers with
// module support. Browsers are targeted explicitly instead
// of using the "esmodule: true" target since that leads to
// polyfilling older browsers and a larger bundle.
const babelConfigESM = JSON.parse(JSON.stringify(babelConfig));
babelConfigESM.presets[0][1].targets = {
    browsers: [
        'last 2 Chrome versions', 'not Chrome < 60',
        'last 2 Safari versions', 'not Safari < 10.1',
        'last 2 iOS versions', 'not iOS < 10.3',
        'last 2 Firefox versions', 'not Firefox < 60',
        'last 2 Edge versions', 'not Edge < 16',
    ]
};

let cache = {};

// Creates a bundle with broad browser support, exposed
// as UMD
gulp.task('js-es5', () => {
    return rollup({
        cache: cache.umd,
        input: 'js/index.js',
        plugins: [
            resolve(),
            commonjs(),
            babel(babelConfig),
            terser()
        ]
    }).then(bundle => {
        cache.umd = bundle.cache;
        return bundle.write({
            name: 'Reveal',
            file: './dist/reveal.js',
            format: 'umd',
            banner: banner,
            sourcemap: true
        });
    });
})

// Creates an ES module bundle
gulp.task('js-es6', () => {
    return rollup({
        cache: cache.esm,
        input: 'js/index.js',
        plugins: [
            resolve(),
            commonjs(),
            babel(babelConfigESM),
            terser()
        ]
    }).then(bundle => {
        cache.esm = bundle.cache;
        return bundle.write({
            file: './dist/reveal.esm.js',
            format: 'es',
            banner: banner,
            sourcemap: true
        });
    });
})
gulp.task('js', gulp.parallel('js-es5', 'js-es6'));

// Creates a UMD and ES module bundle for each of our
// built-in plugins
gulp.task('plugins', () => {
    return Promise.all([
        { name: 'RevealHighlight', input: './plugin/highlight/plugin.js', output: './plugin/highlight/highlight' },
        { name: 'RevealMarkdown', input: './plugin/markdown/plugin.js', output: './plugin/markdown/markdown' },
        { name: 'RevealSearch', input: './plugin/search/plugin.js', output: './plugin/search/search' },
        { name: 'RevealNotes', input: './plugin/notes/plugin.js', output: './plugin/notes/notes' },
        { name: 'RevealZoom', input: './plugin/zoom/plugin.js', output: './plugin/zoom/zoom' },
        { name: 'RevealMath', input: './plugin/math/plugin.js', output: './plugin/math/math' },
    ].map(plugin => {
        return rollup({
            cache: cache[plugin.input],
            input: plugin.input,
            plugins: [
                resolve(),
                commonjs(),
                babel({
                    ...babelConfig,
                    ignore: [/node_modules\/(?!(highlight\.js|marked)\/).*/],
                }),
                terser()
            ]
        }).then(bundle => {
            cache[plugin.input] = bundle.cache;
            bundle.write({
                file: plugin.output + '.esm.js',
                name: plugin.name,
                format: 'es'
            })

            bundle.write({
                file: plugin.output + '.js',
                name: plugin.name,
                format: 'umd'
            })
        });
    }));
})

gulp.task('css-themes', () => gulp.src(['./css/theme/source/*.{sass,scss}'])
    .pipe(sass())
    .pipe(gulp.dest('./dist/theme')))

gulp.task('css-core', () => gulp.src(['css/reveal.scss'])
    .pipe(sass())
    .pipe(autoprefixer())
    .pipe(minify({ compatibility: 'ie9' }))
    .pipe(header(banner))
    .pipe(gulp.dest('./dist')))

gulp.task('css', gulp.parallel('css-themes', 'css-core'))

gulp.task('eslint', () => gulp.src(['./js/**', 'gulpfile.js'])
    .pipe(eslint())
    .pipe(eslint.format()))

gulp.task('test', gulp.series('eslint'))

gulp.task('default', gulp.series(gulp.parallel('js', 'css', 'plugins'), 'test'))

gulp.task('build', gulp.parallel('js', 'css', 'plugins'))

gulp.task('package', gulp.series('default', () =>

    gulp.src([
        './index.html',
        './dist/**',
        './lib/**',
        './images/**',
        './plugin/**',
        './**.md'
    ]).pipe(zip('reveal-js-presentation.zip')).pipe(gulp.dest('./'))

))

gulp.task('reload', () => gulp.src(['*.html', '*.md'])
    .pipe(connect.reload()));

gulp.task('serve', () => {

    connect.server({
        root: root,
        port: port,
        host: '0.0.0.0',
        livereload: true
    })

    gulp.watch(['*.html', '*.md'], gulp.series('reload'))

    gulp.watch(['js/**'], gulp.series('js', 'reload', 'test'))

    gulp.watch(['plugin/**/plugin.js'], gulp.series('plugins', 'reload'))

    gulp.watch([
        'css/theme/source/*.{sass,scss}',
        'css/theme/template/*.{sass,scss}',
    ], gulp.series('css-themes', 'reload'))

    gulp.watch([
        'css/*.scss',
        'css/print/*.{sass,scss,css}'
    ], gulp.series('css-core', 'reload'))

    gulp.watch(['test/*.html'], gulp.series('test'))

})