tree.rb

def dirTree( path, pipes = '' )
  currentDirectory = Dir.new(path)
  currentDirectory.sort.each.with_index do |file,index|
    if file != '.' and file != '..'
      if index == currentDirectory.sort.size - 1
        predictor = '└───'
        nextChar = ' '
      else
        predictor = '├───'
        nextChar = '│'
      end
      output = "#{pipes}#{predictor}#{file}"
      if File.ftype("#{path}/#{file}") == 'directory'
        puts (output)
        dirTree("#{path}/#{file}", "#{ pipes }#{nextChar}\t")
      else
        puts (output)
      end
    end
  end
end

dirTree './testdata'