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Somewhat coincidental to the latest release of vaniila processing, I have just released the latest version of ruby-processing, which is available as a rubygem.
gem install ruby-processing
But it does require an installed version of regular processing (I am recommending updating to the latest version for all users). For detailed instructions see wiki. The latest version of processing fixes the watch mode in ruby-processing, so it can now be used with P2D and P3D sketches.