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  #
  # Format filesize.
  #
  def Format.filesize(bytes, precision = 1)
    bytes = bytes.to_f
    case 
      when bytes < 1.kb; "%d #{Format.plural(bytes, 'byte', 'bytes')}" % bytes
      when bytes < 1.mb; "%.#{precision}f #{Format.plural((bytes / 1.kb), 'kilobyte', 'kilobytes')}" % (bytes / 1.kb)
      when bytes < 1.gb; "%.#{precision}f #{Format.plural((bytes / 1.mb), 'megabyte', 'megabytes')}" % (bytes / 1.mb)
      when bytes >= 1.gb; "%.#{precision}f #{Format.plural((bytes / 1.gb), 'gigabyte', 'gigabytes')}" % (bytes / 1.gb)
    end
  end
  
  #
  # Format plural
  #
  def Format.plural(count, singular, plural)
    count == 1 ? singular : plural
  end 

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class Format
  FILESIZE_UNITS = %w[ bytes kilobytes megabytes gigabytes ]
  
  def self.filesize(bytes, precision = 1)
    new(bytes).to_s(precision)
  end
  
  def initialize(bytes)
    @bytes = bytes.to_f
  end
  
  def units
    FILESIZE_UNITS.inject("bytes") do |method,current|
      1.send(current) <= @bytes ? current : method
    end
  end
  
  def humanized_units
    bytes == 1 ? units.to_s.sub(/s$/, '') : units.to_s
  end
  
  def bytes
    @bytes / 1.send(units)
  end
  
  def to_s(precision = 1)
    precision = 0 if units == "bytes"
    "%.#{precision}f %s" % [ bytes, humanized_units ]
  end
end

class Numeric
  def bytes
    self
  end
  alias_method :byte, :bytes
  alias_method :b, :bytes
  
  def kilobytes
    self * 1024
  end
  alias_method :kilobyte, :kilobytes
  alias_method :kb, :kilobytes
  
  def megabytes
    self * 1024.kilobytes
  end
  alias_method :megabyte, :megabytes
  alias_method :mb, :megabytes
  
  def gigabytes
    self * 1024.megabytes
  end
  alias_method :gigabyte, :gigabytes
  alias_method :gb, :gigabytes
end