edlp_d8/web/modules/custom/edlp_studio/includes/edlp_compositions_list.inc

<?php

use \Drupal\Core\Url;
use \Drupal\Component\Utility\Unicode;

function template_preprocess_edlp_compositions_list(&$vars){

  $vars['compositions'] = array (
    '#theme' => 'item_list',
    '#items' => [],
  );
  $i = 0;
  foreach($vars['composition_entities'] as $entity){
    // get the url
    $url = Url::fromRoute('entity.composition.canonical',
            ['composition' => $entity->id()], ['absolute' => TRUE]);
    // get the delete url
    $delete_url = Url::fromRoute('edlp_studio.composition_controller_action_ajax',
                  ['action' => 'delete', 'cid'=>$entity->id()], ['absolute' => TRUE]);

    $title = $entity->getName();

    array_unshift($vars['compositions']['#items'], array(
      'compo_link' => array(
        '#title' => $title,
        '#type' => 'link',
        '#url' => $url,
        '#options'=>array(
          'attributes' => array(
            'data-drupal-link-system-path' => $url->getInternalPath(),
            'cid' => $entity->id(),
            'class' => ['composition-link', $i==count($vars['composition_entities'])-1 ? 'is-active':''],
            'title'=>$title,
          ),
        ),
      ),
      'delete_link' => array(
        '#title' => t("delete"),
        '#type' => 'link',
        '#url' => $delete_url,
        '#options'=>array(
          'attributes' => array(
            'data-drupal-link-system-path' => $delete_url->getInternalPath(),
            'cid' => $entity->id(),
            'class' => ['delete-composition-link'],
            'title'=> t('Delete @title', array('@title'=>$title)),
          ),
        ),
      )
    ));
    $i++;
  }

  array_unshift($vars['compositions']['#items'], array(
    '#title' => t('New composition'),
    '#type' => 'link',
    '#url' => $vars['new_composition_url'],
    '#options'=>array(
      'attributes' => array(
        'data-drupal-link-system-path' => $vars['new_composition_url']->getInternalPath(),
        'class' => ['new-composition-link']
      ),
    ),
  ));
}