class Object

# File bin/timestamp, line 11
def collectFileMtime dir, option
  exclude_ext = option[:exclude_ext]
  exclude_dir = option[:exclude_dir]
  include_ext = option[:include_ext]
  md5 = option[:md5]
  formatter = option[:time_format]

  # debugger
  map = {}
  full_dir = File.expand_path dir
  Dir.chdir full_dir
  is_empty = true
  Dir.foreach "." do |file|
    if File.directory? file
      unless exclude_dir.to_s.include? file
        pwd = Dir.pwd
        submap = collectFileMtime file, option
        is_empty = false unless submap.nil? or submap.empty?
        unless submap.nil?
          map[file] = submap
        end
        Dir.chdir pwd
      end
    else
      ext = File.extname file
      if include_ext.length == 0 or include_ext.to_s.include?(ext)
        unless exclude_ext.to_s.include? ext
          mtime = File.mtime file
          if md5 > 0
            map[file] = Digest::MD5.hexdigest(mtime.to_s)[0...md5];
          else
            map[file] = mtime.strftime formatter
          end
          is_empty = false
        end
      end
    end
  end

  return is_empty ? nil : map
end