beautify javascript directory

beautify.rb

#!/usr/bin/env ruby
if ARGV[0]
  Dir.glob(ARGV[0]+"**/*.js").each do |file|
    puts "Beautifying JS file: #{file}"
    puts `js-beautify -s 2 -j -o "#{file}.pretty" "#{file}"`
    puts `mv "#{file}.pretty" #{file}`
  end 
else
  puts "Usage: #{__FILE__} directory"
end