base.js

var Metalsmith   = require('metalsmith'),
    filenames    = require("metalsmith-filenames"),
    date         = require('metalsmith-build-date'),
    layouts      = require('metalsmith-layouts'),
    i18n         = require('metalsmith-i18n'),
    mapsite      = require('metalsmith-mapsite'),
    permalinks   = require('metalsmith-permalinks'),
    ignore       = require('metalsmith-ignore'),
    rename       = require('metalsmith-rename'),
    fingerprint  = require('metalsmith-fingerprint'),
    inPlace      = require('metalsmith-in-place'),
    imagemin     = require('metalsmith-imagemin'),
    uglify       = require('metalsmith-uglify'),
    stylus       = require('metalsmith-stylus'),
    autoprefixer = require('metalsmith-autoprefixer'),
    assets       = require('metalsmith-assets');
    handlebars   = require('handlebars');

handlebars.registerHelper('ifequals', function (item, comparison, options) {
    if (item == comparison) {
        return options.fn(this);
    } else {
        return options.inverse(this);
    }
});

handlebars.registerHelper('isActive', function (currentPage, pages) {
	const pagesArray = pages.split(',');
  return pagesArray.includes(currentPage);
});

handlebars.registerHelper({
  and: function () {
      return Array.prototype.slice.call(arguments, 0, -1).every(Boolean);
  },
  or: function () {
      return Array.prototype.slice.call(arguments, 0, -1).some(Boolean);
  }
});

handlebars.registerHelper('join', function() {
	const elements = Array.from(arguments)
	return elements.slice(0, -1).join('');
})


module.exports = {
  getMetalsmith: function (locale) {
    var destination = 'build/' + locale;
    var metalsmith = new Metalsmith(__dirname)

      // Config
      .use(filenames)
      .use(ignore([
        "layouts/*",
        "locales/*",
        "partials/*",
        "styles/mixins/*",
        "styles/_*",
      ]))
      .use(date)

      // Images
      //.use(imagemin({
        //optimizationLevel: 3,
        //svgoPlugins: [{ removeViewBox: false }]
      //}))

       //Javascript
      .use(uglify({
        filter: ['js/vendors/*.js', 'js/*.js'],
        removeOriginal: true,
        sourceMap: true,
        order: ['js/vendors/**/*.js', 'js/*.js'],
        concat: 'js/main.min.js'
      }))

      // Styles
      .use(stylus())
      .use(autoprefixer({
        browsers : ['last 2 versions'],
        cascade  : false
      }))
      .use(fingerprint({
        pattern: 'styles/main.css'
      }))

      // Translation
      .use(i18n({
        default: locale,
        locales: ['en', 'fr', 'es'],
        directory: 'src/locales'
      }))
      .use(function locales(files, metalsmith, done) {
          for (var file in files) {
            files[file].locale = locale;
            done();
          };
        }
      )

      // Bootstrap
			.use(assets({
        source: './node_modules/cozy-bootstrap/dist/',
        destination: './styles'
      }))

      // HTML
      .use(layouts({
        engine: 'handlebars',
        directory: 'src/layouts',
        partials: "src/partials"
      }))
      .use(inPlace({
        engine: 'handlebars',
        directory: 'src'
      }))

      // Misc
      .use(mapsite({
        omitExtension: true,
        hostname: "https://cozy.io/" + locale
      }))
      .use(permalinks({
        pattern: ':title',
        relative: false
      }))

      .destination(destination);

    return metalsmith;
  }
}