Puts "utf8 encoding" in all rb files of specified path

ruby_utf8.rb

if (ARGV.size != 1)
	raise ArgumentError, "you must inform a param with path of ruby files"
end

files_path = Dir["#{ARGV[0]}**/**{.rb}"]

files_path.each do |file_path|
	data = File.new(file_path).read
	utf8 = "# encoding: utf-8"
	File.open(file_path, 'w') { |f| f.write(utf8 + "\n\n" + data) } unless data.include? utf8
end

puts "Ruby files inside #{ARGV[0]} suscefull converted to UTF8"