Rendering Markdown

application_helper.rb

module ApplicationHelper
  def md(text)
    text = text || ''
    # in very clear cases, let newlines become <br /> tags
    text.gsub!(/^[\w\"\<][^\n]*\n+/) do |x|
      x =~ /\n{2}/ ? x : (x.strip!; x << "  \n")
    end
    markdown = Redcarpet::Markdown.new(Redcarpet::Render::HTML, autolink: true, space_after_headers: true)
    markdown.render(text).html_safe
  end
end