steveoliver

***: Buffer Playback...
Fabianx: [15:17:27] steveoliver: pong
Fabianx: [15:17:50] steveoliver: Can you pass me the link to drill able again (sorry during moving, not much time left  )
***: Playback Complete.
steveoliver: 2008450
Druplicon: https://drupal.org/node/2008450 => Provide for a drillable variable structure in Twig templates [#2008450] => Drupal core, theme system, major, needs work, 12 comments, 10 IRC mentions
steveoliver: Fabianx: ^^
Fabianx: steveoliver: So implementation is:
Fabianx: ( proof-of-concept)
Fabianx: * Add a new parameter to render and theme.

steveoliver

Discussing this on our call today, Fabianx pointed out one possibility.  Take our example of image field instances within a node template:

To get at the src (or any other) attribute of the first image field instance, one would print:

<code>{{ content.field_image.attributes.src }}</code>

1. The field <code>attributes</code> have not yet been prepared in the context of the parent node template.
2. <code>TwigTemplate::getAttribute()</code> determines the attribute does not exist and then calls a function, tentatively named <code>render_structure()</code>, which returns the variables as would be available in the child template.
3. Then .src and other variables are available.

steveoliver

<h3 id="bestpractices">Best Practices in Preprocess Functions and Twig Templates</h3>
In order to minimize wasteful calls to unneeded resources and make Drupal 8 themeing as performant as possible, please follow these best practices:
<ol>
  <li>Always call <code>t()</code> within templates; never call t() in preprocess.</li>
  <li>Always return render arrays instead of ever calling <code>theme()</code> within a preprocess function.</li>
</ol>

steveoliver

        // controller arguments
        $arguments = $this->resolver->getArguments($request, $controller);

        // call controller
        // i.e. from menu_execute_active_handler
        // 
        $response = call_user_func_array($controller, $arguments);


        // if controller wasn't smart enough to return a complete response...

steveoliver

<!-- BEGIN 'comment_wrapper__node_article' THEME MARKUP -->
<!-- FROM core/themes/stark/templates/node/node--1.html.twig -->
<!-- FILE NAME SUGGESTIONS:
  x node--1.html.twig
  * node--article.html.twig
  * node.html.twig
  -->
<article id="node-1">
  <h2>Title</h2>
  // ...

steveoliver

{# modules/user/templates/user-login-block.html.twig #}

{% block "login-link" %}
<div class="user-login-block-link">
  {{ link }}
</div>
{% endblock %}