Ruby: Automatically remove magic encoding comments

Writing a Ruby script to remove Ruby 1.9's magic encoding comments is still faster for me than figuring out how to do it with Vim.

#!/usr/bin/env ruby

Dir['**/*.rb'].each do |path|
  lines = File.readlines(path)
  new_lines = lines.dup

  lines.each do |line|
    if line =~ /^# encoding: utf-8/i || line !~ /\S/
      new_lines.delete_at(new_lines.index(line))
    else
      break
    end
  end

  print '.'

  File.open(path, 'w') do |file|
    file.write(new_lines.join)
  end
end