desc "minify javascript"
task :minify do
  require "digest/md5"

  script_names = []
  new_index = ""

  IO.foreach("./public/index.html") do |line|
    if !(line =~ /<script.*src="https*:/) && line =~ /<script.*src="(.*)"/
      script_names << $1
    else
      new_index << line
    end
  end

  new_js = ""
  script_names.each do |script_name|
    compressor = IO.popen("java -jar script/yuicompressor-2.2.5.jar --type js", "w+")
    compressor.puts IO.read("./public/#{script_name}")
    compressor.close_write
    compressed = compressor.gets
    if (compressed.nil?)
      puts "Compressing script \"#{script_name}\" returned nil"
    else
      new_js += compressed
    end
    new_js += "\n\n"
  end

  digest = Digest::MD5.hexdigest(new_js)
  filename = "./public/#{digest}.js"
  File.open(filename, "w") { |file| file.write(new_js) }
  puts "Created #{filename}"

  filename = "./public/index-mini.html"
  File.open(filename, "w") do |file|
    minified_script_tag = "<script type=\"text/javascript\" src=\"#{digest}.js\"></script>"
    file.write(new_index.gsub("<!-- minify here -->", minified_script_tag))
  end
  puts "Created #{filename}"
end