secret_santa.rb

# will not pair people with a member of their houshold

households = [%w(Jeannie Terry\ Snr), ["Benton"], ["Terry"], %w(Mandy Marcos Elías Mateo), %w(Erin Matt)]
households.sort!{|a,b| b.length <=> a.length}
names = households.flatten
pairs = {}

names.each do |name|
  household = households.find{|h| h.include?(name)}
  available_names = (names - pairs.values - household)

  if i == names.length - 2 and available_names.include?(names.last) #inelegant
    # prevent an unmatchable last pair
    pairs[name] = names.last
  else
    pairs[name] = available_names.sample
  end
  puts "#{name.ljust(9)} gives a book to #{pairs[name]}"
end