Ticket #5: cache.rb

module ActionController::Caching::Fragments
  # Called by Markaby::Builder#cache. Imitate cache_erb_template.
  def cache_markaby_fragment(block, name = {}, options = nil)
    if perform_caching
      # check if already cached, otherwise calculate and write
      cache = read_fragment(name, options) ||
        write_fragment(name, block.call, options)
    else # don't cache
      cache = block.call
    end
    options[:builder] << cache
  end
end

class Markaby::Builder
  # Use this method like you would do in a rhtml template.
  #
  # See Rails' ActionController::Caching::Fragments for documentation:
  # http://api.rubyonrails.com/classes/ActionController/Caching/Fragments.html
  def cache name, &block
    @helpers.controller.cache_markaby_fragment(block, name, :builder => self)
  end
end