part of a rake task to create an index and thank you page from given title and primary color

static.rake

  desc "given a name and primary color, build static index and thank you pages, returning directory path of files"
  task :build, :site_id, :name, :primary_color do |t, args|
    dirname = DateTime.now.to_s
    dirname += '_' + args[:site_id] if args[:site_id].length > 0
    dirpath = Rails.root.join("tmp/static_builds", dirname)

    system("mkdir -p #{ dirpath.to_path }")
    system("cp -r #{ Rails.root }/static/* #{ dirpath.to_path }")

    puts("name = #{ args[:name] }")
    puts("primary_color = #{ args[:primary_color] }")
    puts("dirpath = #{ dirpath }")

    Dir.glob(dirpath.to_path + "/*").each do |fn|
      IO.write(fn, File.open(fn){|f|
        f.read
          .gsub('__MVP__NAME__', args[:name])
          .gsub('__MVP__PRIMARY_COLOR__', args[:primary_color])
      })
    end

    dirpath.to_path
  end

this is from manualviableproduct.com.