ServiceGenerator.php

<?php
/**
 * @file
 * Contains \Drupal\AppConsole\Generator\ServiceGenerator.
 */

namespace Drupal\AppConsole\Generator;

class ServiceGenerator extends Generator
{
    /**
     * Generator Service
     * @param  string $module Module name
     * @param  string $service_name Service name
     * @param  string $class_name Class name
     * @param  string $interface If TRUE an interface for this service is generated
     * @param  array $services List of services
     */
    public function generate($module, $service_name, $class_name, $interface, $services)
    {
        $parameters = [
          'module' => $module,
          'service_name' => $service_name,
          'class_name' => $class_name,
          'interface' => $interface,
          'services' => $services,
          'file_exists' => file_exists($this->getModulePath($module) . '/' . $module . '.services.yml'),
        ];

        $this->renderFile(
          'module/services.yml.twig',
          $this->getModulePath($module) . '/' . $module . '.services.yml',
          $parameters,
          FILE_APPEND
        );

        $this->renderFile(
          'module/src/service.php.twig',
          $this->getModulePath($module) . '/src/' . $class_name . '.php',
          $parameters
        );

        if ($interface) {
            $this->renderFile(
              'module/src/service-interface.php.twig',
              $this->getModulePath($module) . '/src/' . $class_name . 'Interface.php',
              $parameters
            );
        }
    }
}