thor file to add utf-8 header on ruby files. useful for converting ruby 1.8 projects to 1.9

utf8_header.rb

class Utf8Header < Thor
  desc "add", "Add Content UTF-8 on top of all .rb/.feature files"
  # copy & pasted from https://gist.github.com/738245
  def add
    files = Array.new
    ["*.rb", "*.rake","*.feature"].each do |extension|
      files.concat(Dir[ File.join(Dir.getwd.split(/\\/), "**", extension) ])
    end

    files.each do |file|
      content = File.read(file)
      next if content[0..16] == "# coding: UTF-8\n\n" ||
              content[0..22] == "# -*- coding: utf-8 -*-"

     ["\n\n", "\n"].each do |file_end|
        content = content.gsub(/(# encoding: UTF-8#{file_end})|(# coding: UTF-8#{file_end})|(# -*- coding: UTF-8 -*-#{file_end})|(# -*- coding: utf-8 -*-#{file_end})/i, "")
      end

      new_file = File.open(file, "w")
      new_file.write("# coding: UTF-8\n\n"+content)
      new_file.close
    end
  end
end

gem install thor
thor install utf8_header.rb
thor utf8_header:add