Fetch CoD 4 server info and generate nice JSON output.

cod4.rb

#!/usr/bin/env ruby
#
# Fetch CoD 4 server info and generate nice JSON output.
#
# Usage:
# `$0 0.0.0.0:00000`

require 'json'
require 'socket'

def get_server_info(host, port)
  server_info, *players = UDPSocket.new.tap {
    |s| s.send("\xFF\xFF\xFF\xFFgetstatus", 0, host, port)
  }.recvfrom(1 << 16).first.chomp.gsub(/\^(\d)/, '').split("\n")[1..-1]

  Hash[server_info.split("\\")[1..-1].each_slice(2).to_a].tap { |h|
    h["players"] = players.map { |p|
      /(?<score>\d+) (?<ping>\d+) \"(?<name>.*)\"/ =~ p
      {"score" => score, "ping" => ping, "name" => name }
    }
  }
end

print JSON.pretty_generate(get_server_info(*ARGV.first.split(":")))