Using Sundown in KnpMarkdownBundle

config.yml

knp_markdown:
    parser:
        service: ls_common.sundown.markdown_parser

services.xml

<?xml version="1.0" ?>

<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

    <parameters>
        <parameter key="ls_common.sundown.extensions" type="collection">
            <parameter key="no_intra_emphasis">true</parameter>
            <parameter key="tables">true</parameter>
            <parameter key="fenced_code_blocks">true</parameter>
            <parameter key="autolink">true</parameter>
            <parameter key="strikethrough">true</parameter>
            <parameter key="lax_html_blocks">true</parameter>
        </parameter>
        <parameter key="ls_common.sundown.render_flags" type="collection">
            <parameter key="hard_wrap">true</parameter>
            <parameter key="filter_html">true</parameter>
        </parameter>
    </parameters>

    <services>
        <service id="ls_common.sundown.markdown_parser" class="LS\CommonBundle\Markdown\SundownParser" public="false">
            <argument type="service" id="ls_common.sundown.parser" />
        </service>

        <service id="ls_common.sundown.parser" class="Sundown\Markdown" public="false">
            <argument type="service" id="ls_common.sundown.renderer" />
            <argument>%ls_common.sundown.extensions%</argument>
        </service>

        <service id="ls_common.sundown.renderer" class="Sundown\Render\HTML" public="false">
            <argument>%ls_common.sundown.render_flags%</argument>
        </service>
    </services>

</container>

SundownParser.php

<?php

namespace LS\CommonBundle\Markdown;

use Knp\Bundle\MarkdownBundle\MarkdownParserInterface;
use Sundown\Markdown;

/**
 * SundownParser
 *
 * This class wraps the original Sundown parser to implement the KnpMardownBundle interface
 */
class SundownParser implements MarkdownParserInterface
{
    private $parser;

    public function __construct(Markdown $parser)
    {
        $this->parser = $parser;
    }

    /**
     * Converts text to html using markdown rules
     *
     * @param string $text plain text
     *
     * @return string rendered html
     */
    public function transform($text)
    {
        return $this->parser->render($text);
    }
}