Here's the bit from my config.rb

config.rb

# Count contributors
ready do

  # Prepare the pages
  pages = sitemap.resources.select{ |r|
    r.path.match(/^docs\/.*\.html/) and not r.path.include?("README") and not r.path.match /file\.html$/
  }.sort_by{ |r|
    r.metadata[:page]["language"].downcase
  }
  set :docs, pages

  authors = {}
  pages.each {|p|
    lang = p.metadata[:page]["language"]
    contrib_list = p.metadata[:page]["contributors"]
    if contrib_list.nil?
      authors[lang] = [[p.metadata[:page]["author"], p.metadata[:page]["author_url"]]]
    else
      authors[lang] = contrib_list
    end
  }

  set :authors, authors

  # Count up the contributors with git blame
  contributors = {}
  pages.each{|p|
    system("cd source/docs && git blame #{p.path.split('/')[1]}.markdown >> tmp.txt")
    File::open('source/docs/tmp.txt'){|f|
      names = f.readlines.map{|r|
        name = r.split(' ')[1]
        name[1..name.length]
      }

      lang = p.metadata[:page]["language"]
      contributors[lang] = Set::new(names).length + authors[lang].length - 2
    }
    system("rm source/docs/tmp.txt")
  }
  set :contributors, contributors

  # Prepare code files to serve

  pages.each{ |p|
    lang = p.metadata[:page]["language"]
    filename = p.metadata[:page]["filename"]

    puts filename

    unless filename.nil?
      s = nil
      File::open("source/#{p.path}.markdown") {|f|
        s = StringScanner.new(f.read)
      }

      puts "========================= #{p.path} ===========================\n"
      code = ''
      until s.eos?
        s.skip_until(/^```.*$/)
        out = s.scan_until(/^```/)
        if out.nil?
          break
        end
        code += out
      end

      code = code.gsub('```', '')


      filename = p.metadata[:page]["filename"] || "scratch.php"
      proxy "/docs/files/#{filename}", "/docs/file.html", :locals => {:rawcode => code}, :ignore => true, :layout => false
    end
  }
end