Markdown, Excel template handler for Rails 3.2.

excel_template_handler.rb

class ActionView::Template
  module Handlers
    class Excel      
      def call(template)
        %{
          Tempfile.open('writeexcel').tap do |tmp|
            WriteExcel.new(tmp.path).tap do |workbook|
              #{template.source}
            end.close
          end.tap(&:rewind).read
        }
      end
    end
  end

  register_template_handler(:writeexcel, Handlers::Excel.new)
end

markdown_template_handler.rb

class ActionView::Template
  module Handlers
    class Markdown      
      def call(template)
        "Redcarpet::Markdown.new(Redcarpet::Render::HTML).render(#{template.source.inspect})"
      end
    end
  end

  register_template_handler(:md, Handlers::Markdown.new)
end