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I needed a dirt simple state machine that was flexible enough to meet the needs of some very 'edge' requirements in a project I recently worked on. I found that most of the Ruby state machines out there were making too many assumptions for the level of flexibility I needed. This weekend I wrote a small gem called Bravery.

It's only ~55 lines of Ruby and it:

• Tracks object state
• Handles user-defined callback / validation behavior when entering a state
• Absolutely nothing else (and that's a good thing!)

Check it out on Github.