Domain availability checker

ava.rb

#!/usr/bin/env ruby -wKU

# Examples of usage:
# $ ava domain.com another.* unique765.{com,net}
#   [-] domain.com
#   [-] another.com
#   [-] another.net
#   [+] another.st
#   [+] unique765.com
#   [+] unique765.net

def usage
  puts "usage: ava <domain>..."
  exit
end

usage if ARGV.empty?

# supported tlds:
# com net org me st it
all_tld = %w(com net st)

phrases = [
  /no match/,
  /no entries/,
  /not found/,
  /status:\s+available/
]

domains = []
ARGV.each do |d|
  name, tld = d.split(".")
  tld = "com" unless tld
  if tld == "*"
    all_tld.each do |t| domains << "#{name}.#{t}" end
  else
    domains << "#{name}.#{tld}"
  end
end

domains.each do |domain|
  ava = false
  whois = `whois #{domain}`.downcase
  phrases.each do |w|
    if whois =~ w
      ava = true
      break
    end
  end
  res = ava ? "+" : "-"
  puts "[#{res}] #{domain}"
end