find heavy file

find_heavy_file.rb

require 'fileutils'

class FindHeavyFile
  def self.find(depth = 0)
    size, file = `du -sh *`.strip.split("\n").max_by do |f|
      size,file = f.split "\t"
      to_bytes(size)
    end.split("\t")

    puts "#{'  ' * depth}#{size} #{file}"

    if File.directory?(file)
      FileUtils.cd(file)
      find(depth + 1)
    end
  end

  def self.to_bytes(str)
    unit =  str[-1]
    if unit =~ /[0-9]/
      unit = nil
      size = str[0..-1].to_i
    else
      size = str[0...-1].to_i
    end

    case unit
    when "M"; (size * 1024).to_i
    when "K"; (size * 1024 ** 2).to_i
    when "G"; (size * 1024 ** 3).to_i
    else
      size.to_i
    end
  end
end

FindHeavyFile.find