swagger.module

<?php

/**
 * @file
 * Swagger module.
 */

use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_help().
 */
function swagger_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.swagger':
      $output = '';
      $output .= '<h3>' . t('About Swagger') . '</h3>';
      $output .= '<p><a href="http://swagger.io/" target="_blank">Swagger </a>' . t('is a powerful open source framework backed by a large ecosystem of tools that helps you design, build, document, and consume your RESTful APIs.') . '</p>';
      $output .= '<p>' . t('The Swagger Drupal module allows your to describe your API using a specific JSON schema that outlines the names, order, and other details of the API.') . '</p>';
      $output .= '<p>' . t('The purpose of the module is to generate a json file that can be read and interpreted by <a href="http://swagger.io/swagger-ui/" target="_blank">Swagger UI</a>.') . '</p>';
      return $output;
  }
}

/**
 * Implements hook_theme().
 */
function swagger_theme() {
  return [
    'swagger_ui' => [
      'render element' => 'elements',
    ],
  ];
}