Partitions numeric folders into 3 hierarchy

image_folder_partition

# Place under the same folder where the many folders exists, then run the script.
# This will convert folders like 12345678\ to 012\345\678\

require 'fileutils'

Dir.glob("*") do |f|
  if not FileTest.directory?(f)
    next
  end

  if f[/^\d+$/].nil?
    next
  end

  if f == '000'
    next
  end

  size = FileTest.size(f)

  print f
  print " => "

  part = ("%09d" % f).scan(/.{3}/)
  root = part[0...-1].join("/")
  target = part[-1]

  new_path = "#{root}/#{target}"

  FileUtils.mkdir_p root
  FileUtils.mv f, root
  File.rename "#{root}/#{f}", new_path

  print new_path
  if FileTest.exist?(new_path)
    puts ' success!'
    if FileTest.size(new_path) != size
      puts "size different #{size} => #{FileTest.size(new_path)}"
    end
  end
end