dir3.cr

lib LibC
  fun opendir(name : UInt8*) : Dir*
  fun find_first_file = FindFirstFile(...) : Dir*
end

module LibCWrappers
  def self.opendir(path)
    ifdef windows
      LibC.find_first_file(path, ...)
    else
      LibC.opendir(path)
    end
  end
end
 
class Dir
  def initialize(@path)
    @dir = LibCWrappers.opendir(@path)
  end
end