handlebars-engine

https://github.com/gi/handlebars-ruby

A complete interface to Handlebars.js for Ruby. Handlebars::Engine provides a complete Ruby API for the official JavaScript version of Handlebars, including the abilities to register Ruby blocks/procs as Handlebars helper functions and to dynamically register partials. It uses MiniRacer for the bridge between Ruby and the V8 JavaScript engine. Handlebars::Engine was created as a replacement for handlebars.rb.