dotmailer.module

<?php

/**
 * @file
 * Contains dotmailer.module.
 */

use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Form\FormStateInterface;

/**
 * Implements hook_help().
 */
function dotmailer_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    // Main module help for the dotmailer module.
    case 'help.page.dotmailer':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('Dotmailer integration') . '</p>';
      return $output;

    default:
  }
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function dotmailer_form_field_storage_config_edit_form_alter(&$form, FormStateInterface &$form_state, $form_id) {
  $storage = $form_state->getStorage();

  /* @var $field_config \Drupal\field\Entity\FieldConfig */
  $field_config = $storage['field_config'];

  $field_type = $field_config->get('field_type');

  if ($field_type == 'dotmailer_address_book_subscribe') {
    // Hide the cardinality setting:
    $form['cardinality_container']['cardinality_number']['#default_value'] = 1;
    $form['cardinality_container']['#access'] = FALSE;
  }
}