gradient_server-1.0.x-dev/modules/gradient_core/gradient_core.module

<?php

use Drupal\Core\Form\FormStateInterface;

/**
 * Implements hook_form_FORM_ID_alter().
 */
function gradient_core_form_node_landing_page_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  $form['make_home'] = [
    '#type' => 'checkbox',
    '#title' => 'Make this a new home page',
    '#description' => 'When selected, this page will become the site\'s new home page',
    '#default_value' => fALSE,
    '#group' => 'footer',
    '#weight' => 2,
    '#states' => [
      'invisible' => ['input[name="status[value]"' => ['checked' => FALSE]],
      'visible' => ['input[name="status[value]"' => ['checked' => TRUE]],
    ]
  ];
  $form['actions']['submit']['#submit'][] = 'gradient_core_make_home_handler';
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function gradient_core_form_node_landing_page_edit_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  $uri = $form_state->getFormObject()->getEntity()->toUrl()->toString();
  $home = \Drupal::configFactory()
    ->getEditable('system.site')
    ->get('page.front');
  if ($uri === $home) {
    $form['actions']['is_home'] = [
      '#type' => 'markup',
      '#markup' => '<p><strong>Be careful, you are editing the home page of your site.</strong></p>',
      '#group' => 'footer',
      '#weight' => -2,
    ];
  } else {
    gradient_core_form_node_landing_page_form_alter($form, $form_state, $form_id);
  }
}
/**
 * A form submit handler to make a landing page a new home page.
 */
function gradient_core_make_home_handler(&$form, FormStateInterface $form_state) {
  if ($form_state->getValue('status') && $form_state->getValue('make_home')) {
    $uri = $form_state->getFormObject()->getEntity()->toUrl()->toString();
    \Drupal::configFactory()
      ->getEditable('system.site')
      ->set('page.front', $uri)
      ->save();
  }
}

/**
 * Implements hook_theme_suggestions_HOOK().
 */
function gradient_core_theme_suggestions_feeds_feed(array $variables) {
  $suggestions = [];
  $entity = $variables['elements']['#feeds_feed'];
  $sanitized_view_mode = strtr($variables['elements']['#view_mode'], '.', '_');

  $suggestions[] = 'feeds_feed__' . $sanitized_view_mode;
  $suggestions[] = 'feeds_feed__' . $entity->bundle();
  $suggestions[] = 'feeds_feed__' . $entity->bundle() . '__' . $sanitized_view_mode;
  $suggestions[] = 'feeds_feed__' . $entity->id();
  $suggestions[] = 'feeds_feed__' . $entity->id() . '__' . $sanitized_view_mode;
  return $suggestions;
}

/**
 * Implements hook_theme_suggestions_HOOK().
 */
function gradient_core_theme_suggestions_taxonomy_term(array $variables) {
  $suggestions = [];
  $entity = $variables['elements']['#taxonomy_term'];
  $sanitized_view_mode = strtr($variables['elements']['#view_mode'], '.', '_');

  $suggestions[] = 'taxonomy_term__' . $sanitized_view_mode;
  $suggestions[] = 'taxonomy_term__' . $entity->bundle() . '__' . $sanitized_view_mode;
  $suggestions[] = 'taxonomy_term__' . $entity->id() . '__' . $sanitized_view_mode;
  return $suggestions;
}

/**
 * Implements hook_preprocess_HOOK().
 */
function gradient_core_preprocess_taxonomy_term (array &$variables) {
  $variables['canonical'] = $variables['term']->toUrl('canonical')->toString();
}

/**
 * Implements hook_preprocess_HOOK().
 */
function gradient_core_preprocess_block(array &$variables) {
  if (!empty($variables['elements']['content']['#block_content'])) {
    $block = $variables['elements']['content']['#block_content'];
    if ($block && $block->hasField('source_entity')) {
      $source = $block->get('source_entity')->entity;
      if ($source) {
        $variables['source'] = [
          'url' => $source->url->first()->getUrl()->toString(),
          'name' => $source->label(),
          'canonical' => $source->toUrl()->toString(),
        ];
        if (($logo = $source->logo->entity) && ($style = $block->get('image_style')->entity)) {
          $variables['source']['logo'] = $style->buildUrl($logo->getFileUri());
        }  
      }
    }
  }
}