cancel_account-8.x-1.1/cancel_account.module

<?php

/**
 * @file
 * This is the module for cancel user account separate form.
 */

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

/**
 * Implements hook_help().
 */
function cancel_account_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.cancel_account':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('This module provides cancel user account separate form and adds it to user edit form by default if user has cancel account permissions edits his own account.') . '</p>';
      $output .= '<h3>' . t('Uses') . '</h3>';
      $output .= '<p>' . t('You can customize this form using <em>hook_form_alter()</em> or <em>hook_form_cancel_account_form_alter()</em>.') . '</p>';

      return $output;
  }
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function cancel_account_form_user_form_alter(&$form, FormStateInterface &$form_state) {
  // Check if user edits his own account.
  $own = $form_state->get('user');
  if ($own) {
    // Hide Cancel account button.
    if (isset($form['actions']['delete'])) {
      $form['actions']['delete']['#access'] = FALSE;
    }

    // Check cancel account permissions and prevent adding form for superadmin.
    if ($own->hasPermission('cancel account') && $own->id() != 1) {
      // Get cancel user account separate form.
      $cancel_form = \Drupal::formBuilder()->getForm(CancelAccountForm::class, $own->id());

      // Add it to the end of user edit form.
      $form['#suffix'] = \Drupal::service('renderer')->render($cancel_form);
    }
  }
}