A first attempt at a little Jekyll plugin to parse ==text== into <mark>text</mark>

jekyll-plugin-highlight.rb

class HighlightsGenerator < Jekyll::Generator
  def generate(site)

    all_docs = site.documents

    # Converts Markdown-plus ==text== to  <mark>text</mark>
    all_docs.each do |current_note|
      current_note.content = current_note.content.gsub(
        /\=\=(.*)\=\=/i,
        '<mark>\1</mark>'
      )
    end
  end
end

The issue with this plugin currently is that any other markdown contained between == == is rendered un-converted to HTML.