class Travis::Tools::Formatter

def file_size(input, human = true)
  return "#{input} B" unless human
  format = "B"
  iec    = %w[KiB MiB GiB TiB PiB EiB ZiB YiB]
  while human and input > 512 and iec.any?
    input /= 1024.0
    format = iec.shift
  end
  input = input.round(2) if input.is_a? Float
  "#{input} #{format}"
end