dr8_zth/dr8_zth.module

<?php

/**
 * @file
 * The blog module.
 */

use Drupal\Core\Render\Element;
use Drupal\dr8_zth\Entity\Blog;

/**
 * Implements hook_theme().
 */
function dr8_zth_theme() {
  return array(
    'blog' => array(
      'render element' => 'elements',
    ),
  );
}

/**
 * Returns whether the current page is the page of the passed-in blog.
 *
 * @param \Drupal\dr8_zth\Entity\Blog $blog
 *   A blog entity.
 *
 * @return bool
 *   Is the current route the canonical route for the blog ?
 */
function dr8_zth_blog_is_page(Blog $blog) {
  if (\Drupal::routeMatch()->getRouteName() == 'entity.blog.canonical' && $page_blog_id = \Drupal::routeMatch()->getRawParameter('blog')) {
    return $page_blog_id == $blog->id();
  }
  return FALSE;
}

/**
 * Implements hook_preprocess_blog().
 */
function template_preprocess_blog(&$variables) {
  // Raise deep information to the root.
  $variables['view_mode'] = $variables['elements']['#view_mode'];
  $variables['blog'] = $variables['elements']['#blog'];

  /** @var \Drupal\dr8_zth\BlogInterface $blog */
  $blog = $variables['blog'];

  $variables['url'] = $blog->toUrl()->toString();

  // We use name here because that is what appears in the UI.
  $variables['title'] = $variables['elements']['title'];
  unset($variables['elements']['title']);
  $variables['page'] = $variables['view_mode'] == 'full' && dr8_zth_blog_is_page($blog);

  // Helpful $content variable for templates.
  $variables['content'] = array();
  foreach (Element::children($variables['elements']) as $key) {
    $variables['content'][$key] = $variables['elements'][$key];
  }
}