retrospring/app/services/flavored_markdown.rb

class FlavoredMarkdown < Redcarpet::Render::HTML
  include Rails.application.routes.url_helpers

  def preprocess(text)
    wrap_mentions(text)
  end

  def wrap_mentions(text)
    text.gsub! /(^|\s)(@[a-zA-Z0-9_]{1,16})/ do
      "#{$1}[#{$2}](#{show_user_profile_path $2.tr('@', '')})"
    end
    text
  end

  def header(text, _header_level)
    paragraph text
  end

  def paragraph(text)
    "<p>#{text}</p>"
  end

  def raw_html(raw_html)
    Rack::Utils.escape_html raw_html
  end
end