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"""Module for byte-to-string conversion.

This module provides several utility functions along with another
function that can convert numbers into byte-size representations."""

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__version__ = "$Revision: 2 $"
__date__ = "8 October 2009"
__author__ = "Stephen Chappell <Noctis.Skytower@gmail.com>"
__credits__ = """\
T. Hansen, for his encouraging example as an excellent programmer.
S. Spencer, for reminding me to strive for quality in all things.
J. Sparks, for helping to reignite a dedication to writing code."""

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import sys as _sys

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def convert(number):
    "Convert bytes into human-readable representation."
    assert 0 < number < 1 << 110, 'number out of range'
    ordered = reversed(tuple(format_bytes(partition_number(number, 1 << 10))))
    cleaned = ', '.join(item for item in ordered if item[0] != '0')
    return cleaned

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def partition_number(number, base):
    "Continually divide number by base until zero."
    div, mod = divmod(number, base)
    yield mod
    while div:
        div, mod = divmod(div, base)
        yield mod

def format_bytes(parts):
    "Format partitioned bytes into human-readable strings."
    for power, number in enumerate(parts):
        yield '{} {}'.format(number, format_suffix(power, number))

def format_suffix(power, number):
    "Compute the suffix for a certain power of bytes."
    return (PREFIX[power] + 'byte').capitalize() + ('s' if number != 1 else '')

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PREFIX = ' kilo mega giga tera peta exa zetta yotta bronto geop'.split(' ')

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if __name__ == '__main__':
    _sys.stdout.write('Content-Type: text/plain\n\n')
    _sys.stdout.write(open(_sys.argv[0]).read())

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