Mylyn Wikitext is available on maven central

import java.io.File;
import java.io.StringWriter;
import java.net.URL;

import org.eclipse.mylyn.wikitext.asciidoc.internal.AsciiDocDocumentBuilder;
import org.eclipse.mylyn.wikitext.mediawiki.MediaWikiLanguage;
import org.eclipse.mylyn.wikitext.parser.DocumentBuilder;
import org.eclipse.mylyn.wikitext.parser.MarkupParser;

import com.google.common.base.Charsets;
import com.google.common.io.Files;
import com.google.common.io.Resources;

public class MediaWikiToAdocExample {

  public static void main(String[] args) throws Exception {
    String url = "http://wiki.eclipse.org/index.php?title=Scout/Contribution&action=raw&templates=expand";
    String input = Resources.toString(new URL(url), Charsets.UTF_8);

    MediaWikiLanguage markupLanguage = new MediaWikiLanguage();
    markupLanguage.setInternalLinkPattern("https://wiki.eclipse.org/index.php?title={0}");
    MarkupParser parser = new MarkupParser(markupLanguage);

    StringWriter writer = new StringWriter();
    DocumentBuilder builder = new AsciiDocDocumentBuilder(writer);
    parser.setBuilder(builder);
    parser.parse(input);

    String output = "= Eclipse Scout - Contribution\n\n";
    output += writer.toString();
    Files.write(output, new File("scout_contribution.adoc"), Charsets.UTF_8);
  }
}

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>wikitext.examples</groupId>
    <artifactId>mediawiki-to-adoc</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.eclipse.mylyn.docs</groupId>
            <artifactId>org.eclipse.mylyn.wikitext</artifactId>
            <version>3.0.6</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.mylyn.docs</groupId>
            <artifactId>org.eclipse.mylyn.wikitext.mediawiki</artifactId>
            <version>3.0.6</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.mylyn.docs</groupId>
            <artifactId>org.eclipse.mylyn.wikitext.asciidoc</artifactId>
            <version>3.0.6</version>
        </dependency>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>21.0</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.6.0</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>