require 'redcarpet'
require 'rouge'
require 'rouge/plugins/redcarpet'

module Exposition
  module MarkdownHelper

    # Create a Redcarpet Renderer with Rouge code formatting.
    # See: https://github.com/jneen/rouge#you-can-even-use-it-with-redcarpet
    class HTMLwithHighlighting < Redcarpet::Render::HTML
      include Rouge::Plugins::Redcarpet
    end

    def markdown_to_html(markdown)
      @renderer ||=
        Redcarpet::Markdown.new(HTMLwithHighlighting,
                                extensions = {fenced_code_blocks: true})
      @renderer.render(markdown).html_safe
    end
  end
end