discourse/lib/email_styles.rb

#
# HTML emails don't support CSS, so we can use nokogiri to inline attributes based on
# matchers.
#
class EmailStyles

  def initialize(html)
    @html = html
  end

  def format
    fragment = Nokogiri::HTML.fragment(@html)

    fragment.css('h3').each do |h3|
      h3['style'] = 'margin-bottom: 20px; background-color: #eee; padding: 10px; border: 1px solid #ddd;'
    end

    fragment.css('hr').each do |hr|
      hr['style'] = 'background-color: #ddd; height: 1px; border: 1px;'
    end

    fragment.css('a').each do |a|
      a['style'] = 'text-decoration: none; font-weight: bold; font-size: 15px; color: #006699;'
    end

    fragment.css('ul').each do |ul|
      ul['style'] = 'margin: 0 0 0 10px; padding: 0 0 0 20px;'
    end

    fragment.css('li').each do |li|
      li['style'] = 'padding-bottom: 10px'
    end

    fragment.css('pre').each do |pre|
      pre.replace(pre.text)
    end

    fragment.to_html
  end


end