12 Days of Christmas via rounin (http://rounin.livejournal.com/23870.html) with improvments by me

12_days_of_christmas.rb

#!/usr/bin/env ruby

days = %w(first second third fourth fifth sixth seventh eighth ninth tenth eleventh twelfth)

things = ['a partridge in a pear tree', 'two turtledoves', 'three French hens', 'four calling birds', 'five golden rings', 'six geese a-laying', 'seven swans a-swimming', 'eight maids a-milking', 'nine ladies dancing', 'ten lords a-leaping', 'eleven pipers piping', 'twelve drummers drumming']

days.each_with_index do |day, i|
    puts "On the #{day} day of Christmas, my true love sent to me:"
    day_things = things[0..i].reverse.each_with_index.map do |thing, j|
        case j
            when 0 thing.capitalize
            when i "and #{thing}"
            else thing
        end
    end
    puts day_things.join(",\n") << ".\n\n"
end