add encoding line

gistfile1.rb

#!/usr/bin/env ruby
require "find"

def file_list(dir, parent_dir=nil)
  list = []
  Find.find("./#{dir}").map do |file|
    unless File.directory? file
      list << file
    end
  end
  list
end


def operate(dir)
  content = "# encoding: UTF-8\n"
  file_list(dir).each do |file|
    content << File.read(file)
    File.open(file, "w") do |f|
      f.write content
    end
    content = "# encoding: UTF-8\n"
  end
end

operate(ARGV[0])