A markdown ActionView::Template hander for Rails, that supports string interpolation

hander.rb

require 'redcarpet'

module Handlers
  module Markdown
    class HTMLWithPants < Redcarpet::Render::HTML
      include Redcarpet::Render::SmartyPants
    end

    def self.call(template)
      escaped_source = template.source.gsub('"', '\"')
      "Redcarpet::Markdown.new(::Handlers::Markdown::HTMLWithPants, autolink: true, space_after_headers: true).render(\"#{ escaped_source }\")"
    end
  end
end

initialiser.rb

require './lib/handlers/markdown'

ActionView::Template.register_template_handler :md, Handlers::Markdown