deepestin

#!/usr/bin/env ruby

class Dir

  def self.deepest(d)
  
    deepest = Proc.new do |paths, depth|
      
      # get all files in all dirs.
      # if no file is found, these dirs are deepest
      files = paths.map{ |path| Dir.glob(File.join(path, '*')) }.flatten
      return [paths, depth+1] if files.count == 0
      
      # these files are deepest when none of them is dir
      dirs = files.select { |f| File.directory? f }
      return [files, depth+1] if dirs.count == 0
      
      # if any file is dir, it coild be deeper
      deepest.call(dirs, depth+1)
      
    end
    
    # start process
    deepest.call [d], 0
    
  end  
  
end

path = ARGV.shift

puts Dir.deepest(path)