A new release of the Wikitext gem, version 4.0, is out. The major version number has been bumped because this release breaks compatibility with versions of Ruby prior to 2.0.0. For older versions of Ruby the 3.x series will continue to be supported and available from RubyGems with a
[sudo] gem install wikitext --version 3.1 or similar.
The reason I'm doing it this way is to avoid the overhead of maintaining a single package which is compatible across multiple versions of Ruby; this is a trade off I need to make because I only have time for open source projects like Wikitext outside of my fulltime day-job at Causes.
See the release notes for more details.
About the gem
Wikitext is a fast wikitext-to-HTML translator with a syntax very close to that used by MediaWiki. It is a Ruby extension written with speed and robustness in mind using a Ragel-generated scanner and an extremely fast hand-coded parser, all in C. It has an enormous spec suite.
You can browse the source code repo here or here, or download the gem from the rubygems.org downloads page. For an overview of how to use the extension check out the docs here. If you have RubyGems then you can install it with either
gem install wikitext or
sudo gem install wikitext.