Add ability to attach library stylesheets and/or scripts

[waako]

Makes it possible to attach local or external css files even if in multiple groups.

Library file like this should work in all instances:

accordion:
  js:
    dist/02-molecules/accordion-item/accordion-item.js: {}
  css:
    theme:
      dist/02-molecules/accordion-item/accordion-item.css: {}

icons:
  css:
    base:
      https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css { type: external }
    theme:
      dist/01-base/04-images/icons/icons.css: {}

mobile_menu:
  css:
    base:
      dist/02-molecules/menus/mobile-menu.css: {}

slideout_menu:
  js:
    https://cdnjs.cloudflare.com/ajax/libs/slideout/1.0.1/slideout.min.js { type: external }

[georgebrook]

Hi @waako , I tried using your patch, but it didn't seem to work for me

Also are these supposed to be echo's or return's

[waako]

@georgebrook in what way is it not working, not loading css/js assets defined in THEMENAME.libraries.yml?
How are your assets paths set in libraries file, relative to theme folder?

If I recall, have to use echo in order to ouput js scripts and/or css files, depending on which are defined. if used return for $styleTags then $scriptTags would never be ouput, and function woulderror if no $styleTags.

To be honest, a better solution for that part is Pr #11 use of $library_tags