Twig Extender

Add a simple plugin system to add new twig extensions (Filter and Functions). Provides a new service provider for "twig.extensions" to add new plugins.

Versions

Drupal 8.2 or lower: Use Twig Extender 8.1
Drupal 8.3 or higher: Use Twig Extender 8.2

Documentation

Basic filter and functions: https://github.com/erik-seifert/twig_extender
Extra filter and function: https://github.com/erik-seifert/twig_extender/tree/8.x-2.x/modules/twig_...

Add new functions and filters

Please add your suggestions here.
https://www.drupal.org/node/2701695

Simple Plugin

<?php

namespace Drupal\twig_extender\Plugin\TwigPlugin;

use Drupal\twig_extender\Plugin\Twig\TwigPluginBase;
use Drupal\Component\Utility\Unicode;

/**
 * Example plugin Hello World.
 *
 * @TwigPlugin(
 *   id = "twig_extender_hello",
 *   label = @Translation("Hello world plugin"),
 *   type = "function",
 *   name = "hello",
 *   function = "hello"
 * )
 */
class HelloWorld extends TwigPluginBase {

  /**
   * Implement hello world function.
   */
  public function hello() {
    return 'Hello World';
  }

}

Using in Template

{% hello() %}