I have created a clean fork of ruby-processing as a development branch of ruby-processing. The idea is that you install the latest version of vanilla processing on your machine (this could even be the latest development version of processing from github). You then clone and install JRubyArt https://github.com/monkstone/JRubyArt, and then use the "install_jruby_dev" command to install the the latest version of jruby-complete-9000. Currently building and testing with jruby-1.7.9 and jdk-1.8.0-ea-b118. Probably not for Mac users, but I will be pleased to be proved wrong. In hommage to JRuby (Dr Who take your pick) executable is k9, so there is no conflict with existing ruby-processing.
on 2013-12-12 20:29
on 2014-02-05 21:43
Latest news, now includes experimental support for pry, checkout the pry branch https://github.com/monkstone/JRubyArt/tree/pry, requires an installed jruby (does not use jruby-complete).