gistfile1.txt

class ReverseSortProxy
  attr_reader :value
  def initialize(value)
    @value = value
  end
  
  def <=>(other)
    other.value <=> @value
  end
end
module Enumerable
  def directed_sort_by(*dirs)
    dirs.map! { |x|
      case x
        when :asc, :ascending, 1
          false
        when :desc, :descending, -1
          true
        else
          raise ArgumentError, "Invalid sort order - #{x}"
      end
    }
    sort_by { |x| yield(x).zip(dirs).map { |v,d|
      d ? ReverseSortProxy.new(v) : v
    }}
  end
end