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Setting up Pug (formerly known as Jade)

This recipe demonstrates how to set up Pug as your HTML template engine. In a similar way you can implement a different engine, like Haml.

We assume your directory structure will look something like this:

webapp
└── app
    ├── about.pug
    ├── contact.pug
    ├── index.pug
    ├── includes
    │   ├── footer.pug
    │   └── header.pug
    └── layouts
        └── default.pug

If you had something different in mind, modify paths accordingly.

Steps

1. Install dependencies

Install the Pug gulp plugin:

$ npm install --save-dev gulp-pug

2. Create a views task

Add this task to your gulpfile.js, it will compile .pug files to .html files in .tmp:

gulp.task('views', () => {
  return gulp.src('app/*.pug')
    .pipe($.plumber())
    .pipe($.pug({pretty: true}))
    .pipe(gulp.dest('.tmp'))
    .pipe(reload({stream: true}));
});

We are passing pretty: true as an option to get a nice HTML output, otherwise Pug would output the HTML on a single line, which would break our comment blocks for wiredep and useref.

3. Add views as a dependency of both html and serve

gulp.task('html', ['views', 'styles', 'scripts'], () => {
    ...
gulp.task('serve', ['views', 'styles', 'scripts', 'fonts'], () => {
    ...

4. Update other tasks

html

We want to parse the compiled HTML:

 gulp.task('html', ['views', 'styles'], () => {
   var assets = $.useref.assets({searchPath: ['.tmp', 'app', '.']});

-  return gulp.src('app/*.html')
+  return gulp.src(['app/*.html', '.tmp/*.html'])
     .pipe($.useref({searchPath: ['.tmp', 'app', '.']}))
     .pipe($.if('*.js', $.uglify()))
     .pipe($.if('*.css', $.cssnano()))
     .pipe($.if('*.html', $.htmlmin({collapseWhitespace: true})))
     .pipe(gulp.dest('dist'));
});

extras

We don't want to copy over .pug files in the build process:

 gulp.task('extras', () => {
   return gulp.src([
     'app/*.*',
-    '!app/*.html'
+    '!app/*.html',
+    '!app/*.pug'
   ], {
     dot: true
   }).pipe(gulp.dest('dist'));
 });

wiredep

Wiredep supports Pug:

 gulp.task('wiredep', () => {
   gulp.src('app/styles/*.scss')
     .pipe(wiredep({
       ignorePath: /^(\.\.\/)+/
     }))
     .pipe(gulp.dest('app/styles'));

-  gulp.src('app/*.html')
+  gulp.src('app/layouts/*.pug')
     .pipe(wiredep({
       exclude: ['bootstrap-sass'],
       ignorePath: /^(\.\.\/)*\.\./
     }))
-    .pipe(gulp.dest('app'));
+    .pipe(gulp.dest('app/layouts'));
 });

Assuming your wiredep comment blocks are in the layouts.

serve

Recompile Pug templates on each change and reload the browser after an HTML file is compiled:

 gulp.task('serve', ['views', 'styles', 'scripts', 'fonts'], () => {
   ...
   gulp.watch([
     'app/*.html',
     'app/images/**/*',
     '.tmp/fonts/**/*'
   ]).on('change', reload);

+  gulp.watch('app/**/*.pug', ['views']);
   gulp.watch('app/styles/**/*.scss', ['styles']);
   gulp.watch('app/scripts/**/*.js', ['scripts']);
   gulp.watch('app/fonts/**/*', ['fonts']);
   gulp.watch('bower.json', ['wiredep', 'fonts']);
});

5. Rewrite index.html as layout.pug + index.pug

To partially automatize this job, you can use html2jade. However, at the time of this writing html2jade has some drawbacks (e.g. doesn't support conditional comments) and the output requires cleanup.

app/layouts/default.pug

doctype html
html.no-js(lang='')
  head
    meta(charset='utf-8')
    meta(name='description', content='')
    meta(name='viewport', content='width=device-width, initial-scale=1')
    title webapp
    link(rel='apple-touch-icon', href='apple-touch-icon.png')
    // Place favicon.ico in the root directory

    // build:css styles/vendor.css
    // bower:css
    // endbower
    // endbuild

    // build:css styles/main.css
    link(rel='stylesheet', href='styles/main.css')
    // endbuild

    // build:js scripts/vendor/modernizr.js
    script(src='/bower_components/modernizr/modernizr.js')
    // endbuild
  body
    <!--[if lt IE 10]>
      p.browserupgrade You are using an <strong>outdated</strong> browser. Please <a href="http://browsehappy.com/">upgrade your browser</a> to improve your experience.
    <![endif]-->
    .container
      .header
        ul.nav.nav-pills.pull-right
          li.active: a(href='#') Home
          li: a(href='#') About
          li: a(href='#') Contact

        h3.text-muted webapp

      block content

      .footer
        p &hearts; from the Yeoman team

    // Google Analytics: change UA-XXXXX-X to be your site's ID.
    script.
      (function(b,o,i,l,e,r){b.GoogleAnalyticsObject=l;b[l]||(b[l]=
      function(){(b[l].q=b[l].q||[]).push(arguments)});b[l].l=+new Date;
      e=o.createElement(i);r=o.getElementsByTagName(i)[0];
      e.src='https://www.google-analytics.com/analytics.js';
      r.parentNode.insertBefore(e,r)}(window,document,'script','ga'));
      ga('create','UA-XXXXX-X');ga('send','pageview');

    // build:js scripts/vendor.js
    // bower:js
    script(src='/bower_components/jquery/dist/jquery.js')
    script(src='/bower_components/modernizr/modernizr.js')
    // endbower
    // endbuild

    // build:js scripts/plugins.js
    script(src='/bower_components/bootstrap-sass/assets/javascripts/bootstrap/affix.js')
    script(src='/bower_components/bootstrap-sass/assets/javascripts/bootstrap/alert.js')
    script(src='/bower_components/bootstrap-sass/assets/javascripts/bootstrap/dropdown.js')
    script(src='/bower_components/bootstrap-sass/assets/javascripts/bootstrap/tooltip.js')
    script(src='/bower_components/bootstrap-sass/assets/javascripts/bootstrap/modal.js')
    script(src='/bower_components/bootstrap-sass/assets/javascripts/bootstrap/transition.js')
    script(src='/bower_components/bootstrap-sass/assets/javascripts/bootstrap/button.js')
    script(src='/bower_components/bootstrap-sass/assets/javascripts/bootstrap/popover.js')
    script(src='/bower_components/bootstrap-sass/assets/javascripts/bootstrap/carousel.js')
    script(src='/bower_components/bootstrap-sass/assets/javascripts/bootstrap/scrollspy.js')
    script(src='/bower_components/bootstrap-sass/assets/javascripts/bootstrap/collapse.js')
    script(src='/bower_components/bootstrap-sass/assets/javascripts/bootstrap/tab.js')
    // endbuild

    // build:js scripts/main.js
    script(src='scripts/main.js')
    // endbuild

app/index.pug

extends layouts/default

block content
  .jumbotron
    h1 'Allo, 'Allo!
    p.lead Always a pleasure scaffolding your apps.
    p: a.btn.btn-lg.btn-success(href='#') Splendid!

  .row.marketing
    .col-lg-6
      h4 HTML5 Boilerplate
      p HTML5 Boilerplate is a professional front-end template for building fast, robust, and adaptable web apps or sites.

      h4 Sass
      p Sass is the most mature, stable, and powerful professional grade CSS extension language in the world.

      h4 Bootstrap
      p Sleek, intuitive, and powerful mobile first front-end framework for faster and easier web development.

      h4 Modernizr
      p Modernizr is an open-source JavaScript library that helps you build the next generation of HTML5 and CSS3-powered websites.

6. Test

Check if everything is working properly. Run gulp serve and try changing a .pug file to see if the page updates etc.

7. Celebrate

This wasn't exactly the simplest recipe ever; go grab a 🍺 or something.