Insert missing utf-8 encoding magic comment to existing ruby files. USAGE: ruby insert-utf8-encoding.rb <dir>

insert-utf8-encoding.rb

#!/usr/bin/env ruby
# encoding: utf-8

Dir[File.join(ARGV[0], '**', '*.{rb,rake}')].each do |file|
  lines = File.open(file).readlines
  next if lines[0].match(/#\s+(?:en)?coding:\s+utf-8/i)

  puts "Adding encoding magic comment to #{file}"

  File.open(file, 'w') do |io|
    io << "# encoding: utf-8\n\n"
    io << lines.join
  end

end