version_sort.rb

unsorted_files = [
  "foo-1.10.2.ext",
  "foo-1.11.ext",
  "foo-1.3.ext",
  "foo-1.50.ext",
  "foo-1.8.7.ext",
  "foo-1.9.3.ext",
  "foo-1.ext",
  "foo-10.1.ext",
  "foo-10.ext",
  "foo-100.ext",
  "foo-13.ext",
  "foo-2.0.0.ext",
  "foo-2.0.1.ext",
  "foo-2.0.ext",
  "foo-2.007.ext",
  "foo-2.01.ext",
  "foo-2.012b.ext",
  "foo-2.01a.ext",
  "foo-2.0a.ext",
  "foo-2.0b.ext",
  "foo-2.1.ext",
  "foo-25.ext",
  "foo-6.ext",
]

class Array
  def version_sort
    sorted = self.collect {|file| file.split(".")}.sort
    sorted.collect {|file| file.join(".")}
  end  
end

puts unsorted_files.version_sort