require 'erb'class String  def lines    split $/  end    def strip_whitespace_at_line_ends    lines.map {|line| line.gsub(/\s+$/, '')} * $/  endendmodule Protodoc  module Environment    def include(*filenames)      filenames.map {|filename| Preprocessor.new(filename).to_s}.join("\n")    end  end    class Preprocessor    include Environment        def initialize(filename)      @filename = File.expand_path(filename)      @template = ERB.new(IO.read(@filename), nil, '%')    end        def to_s      @template.result(binding).strip_whitespace_at_line_ends    end  end  endif __FILE__ == $0  print Protodoc::Preprocessor.new(ARGV.first)end