gistfile1.rb

def expand_template( template_file, output_file)

  puts "Building #{output_file}"
  template = File.open(template_file, "r")
  output = File.open(output_file, "w")

  template.each_line do |template_line|
    template_line.gsub(/@([^@]+)@/) do |token|
      value = @config[$1.downcase]
      unless value.nil?
        template_line = template_line.gsub(token, value.to_s)
      end
    end
    output.write(template_line)
  end
  template.close
  output.close
end