circle.rb

Earthquake.init do
  command :circle do |m|
    text = m[1].unpack("U*").map {|i|
      [*case i
      when 97..122 # a-z
        i + 0x24d0 - 97
      when 65..90
        i + 0x24b6 - 65
      when 49..57
        i + 0x245f - 48
      when 48
        0x24ea
      else
        i
      end].pack("U")
    }.join
    input ":update #{text}"
  end
end