Introduction to Drupal 8 theming - cover all the bases of the new D8 theming system with Twig

Introduction to theming for Drupal 8.

We'll create a new Drupal 8 theme using Bootstrap built as a child-theme atop the core theme 'Stable'.

We'll show how to add Bootstrap downloaded right from getbootstrap.com as a library theme dependency in your D8 theme.

Bootstrap is used as an example, but you can user your (micro)framework of choice - e.g. Foundation, bourbon/neat etc. Nothing is Bootstrap specific, we are using it as a well known example.

How to correctly configure D8 for twig/theme debugging. There is a lot of terrible information out there.

Show how to set up theme debugging correctly (no more $drush cr, $drush cr):

• Theme debugging comments in the source
• Disable page caching

Additionally, we'll cover:

• How to work out what templates to use.
• How to work out what preprocess functions to use.
• Define your own regions.
• Define your own js libraries, and only load the js on the pages it's needed - not every page.
• How theme libraries work in D8.

We'll do a quick twig demo, looking at:

• Filters and control structures
• Discuss finding the available template variables
• How to add new ones and pass them to Twig
• Available preprocessor hooks
• And more!