require 'tempfile'
require 'fileutils'
 
COPYRIGHT=%Q(
  ## 
  # Author:     AUTHOR NAME
  # Copyright:  Copy right message
  #             
)

root_dir=ARGV[0] || '.'

Dir.glob("#{root_dir}/{**/}*.rb") do |path|
  puts ">>> Prepending header for #{path} ..."
  tempfile = Tempfile.new('with_copyright')
  lines =File.open(path).readlines

  line=''
  while((line=lines.shift) && (line.strip[0]=='#')) do 
    tempfile.write(line)
  end
  tempfile.write(COPYRIGHT)
  tempfile.write(line)
  tempfile.write(lines.join)
  tempfile.flush
  tempfile.close
  FileUtils.cp(tempfile.path,path)  
end