Add humanize_bytes function to library

powerline/lib/humanize_bytes.py

@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+
+from math import log
+unit_list = zip(['', 'k', 'M', 'G', 'T', 'P'], [0, 0, 1, 2, 2, 2])
+
+
+def humanize_bytes(num, suffix='B', binary_prefix=False):
+	'''Return a human friendly byte representation.
+
+	Modified version from http://stackoverflow.com/questions/1094841
+	'''
+	if num == 0:
+		return '0 ' + suffix
+	div = 1000 if binary_prefix else 1024
+	exponent = min(int(log(num, div)), len(unit_list) - 1)
+	quotient = float(num) / div ** exponent
+	unit, decimals = unit_list[exponent]
+	if unit and binary_prefix:
+		unit += 'i'
+	return '{{quotient:.{decimals}f}} {{unit}}{{suffix}}'\
+		.format(decimals=decimals)\
+		.format(quotient=quotient, unit=unit, suffix=suffix)