Quick version comparator

version.rb

class Version
  include Comparable
  attr_reader :a, :b, :c, :str

  def initialize str
    parts = str.split('.')
    raise unless parts.length == 3
    @a, @b, @c = parts.map(&:to_i)
    @str       = str
  end

  def inspect ; @str end

  def <=> other
    if
      self.a == other.a &&
      self.b == other.b &&
      self.c == other.c
      return 0
    elsif
      self.a > other.a ||
      (self.a == other.a && self.b > other.b) ||
      (self.a == other.a && self.b == other.b && self.c > other.c)
      return 1
    else
      return -1
    end
  end
end

def v str ; Version.new(str) end
# e.g.  puts "hello" if v('1.2.1') > v('1.2.0')