Hack to enable refinements in Sinatra (Tilt) templates

sinatra_template_refinement_hack.rb

require "sinatra/base"

class App < Sinatra::Base

  using SomeRefinementModule

  # hack to enable refinements in templates
  module CompiledTemplates
    _binding = binding # get the current binding
    # add a class_eval method to the binding that does an eval in the binding
    def _binding.class_eval(*args)
      eval(*args)
    end
    # insert our binding into Tilt::Template as Object, so when it calls
    # Object.class_eval it's actually calling _binding.eval
    Tilt::Template::Object = _binding
    # Tilt expects compiled methods in Tilt::TOPOBJECT, which also needs to
    # be in scope for the _binding.eval, set those to this module
    Tilt::TOPOBJECT = TOPOBJECT = self
  end

  # ...

end