Rake task for embedding external (but local) scripts and stylesheets in an HTML page

gistfile1.rb

# Assuming that the original file is named index.template.html, and the file that will
# be actually served is index.html
 
task :bundle do
  require 'nokogiri'

  root = File.dirname __FILE__

  document = Nokogiri::HTML File.read(root + '/index.template.html')

  # Get all scripts that have a src attribute and embed their contents,
  # removing the src attribute
  scripts = document.css 'script[src]'
  scripts.each do |script|
    path = root + '/' + script['src']

    if File.exists? path
      puts "Bundling #{script['src']}"
      script.content = File.read path
      script.remove_attribute 'src'
    end
  end

  # Get all externally linked local stylesheets and embed their contents,
  # replacing it with a <style> tag
  stylesheets = document.css 'link[rel="stylesheet"][href]'
  stylesheets.each do |stylesheet|
    path = root + '/' + stylesheet['href']

    if File.exists? path
      puts "Bundling #{stylesheet['href']}"
      style = Nokogiri::XML::Node.new 'style', document
      style.content = File.read path
      stylesheet.before style
      stylesheet.remove
    end
  end

  # Write the document over index.html
  index = File.open root+'/index.html', 'w'
  document.write_to index
  index.close
end