require 'alib'

this = open __FILE__

n_threads = 5

alib.util.threadify this, n_threads do |line, lineno|
  puts line
end




__END__
class Time
  class Distance < ::Hash
    def method_missing m, *a, &b
      super unless has_key? m.to_sym
      self[m.to_sym]
    end
  end

  def distance other, limit = :years
    s = ( to_i - other.to_i ).abs
    d = Distance.new 
    format = Array.new 
    values = Array.new

    ops = [
      [ :years, 31536000 ],
      [ :months, 2592000 ],
      [ :weeks, 604800 ],
      [ :days, 86400 ],
      [ :hours, 3600 ],
      [ :minutes, 60 ],
      [ :seconds, 1 ],
    ] 

    index = 0 

    ops.each_with_index do |pair, i|
      unit = pair.first
      break(index = i) if limit == unit
    end

    ops[index .. -1].each do |pair|
      unit, n = pair
      if n > s
        value = 0
        d[unit] = value
      else
        value, s = s.divmod n
        d[unit] = value
        values << value
        unit = value == 1 ? unit.to_s.chop : unit.to_s
        format << "%d #{ unit }"
      end

    end

    if format.size > 1
      comma = ',' if format.size > 2
      format[-2] = "#{ format[-2] }#{ comma } and #{ format[-1] }"
      format.pop
    end
    format = format.join ', '

    d[:formatted] = format % values

    d
  end
end

a = Time.now
b = a + 120 + 2
p a.distance(b, :days).formatted

a = Time.now
b = a + (2 * 3600)
p a.distance(b).formatted

a = Time.now
b = a + (31536000)
p a.distance(b).formatted

a = Time.now
b = a + (31536000 + 3600 + 60 + 42)
p a.distance(b).formatted

a = Time.now
b = a + (31536000 + 3600 + 60 + 42)
p a.distance(b, :weeks).formatted