Pretty file size in Ruby?

Question

I\'m trying to make a method that converts an integer that represents bytes to a string with a \'prettied up\' format.

Here\'s my half-working attempt:

Answer 1

You get points for adding a method to Integer, but this seems more File specific, so I would suggest monkeying around with File, say by adding a method to File called .prettysize().

But here is an alternative solution that uses iteration, and avoids printing single bytes as float :-)

def format_mb(size)
  conv = [ 'b', 'kb', 'mb', 'gb', 'tb', 'pb', 'eb' ];
  scale = 1024;

  ndx=1
  if( size < 2*(scale**ndx)  ) then
    return "#{(size)} #{conv[ndx-1]}"
  end
  size=size.to_f
  [2,3,4,5,6,7].each do |ndx|
    if( size < 2*(scale**ndx)  ) then
      return "#{'%.3f' % (size/(scale**(ndx-1)))} #{conv[ndx-1]}"
    end
  end
  ndx=7
  return "#{'%.3f' % (size/(scale**(ndx-1)))} #{conv[ndx-1]}"
end