#! /usr/bin/env python

# Print the product of age and size of each file, in suitable units.

#

# Usage: byteyears [ -a | -m | -c ] file ...

#

# Options -[amc] select atime, mtime (default) or ctime as age.

import sys, os, time

from stat import *

def main():

    # Use lstat() to stat files if it exists, else stat()

    try:

        statfunc = os.lstat

    except AttributeError:

        statfunc = os.stat

    # Parse options

    if sys.argv[1] == '-m':

        itime = ST_MTIME

        del sys.argv[1]

    elif sys.argv[1] == '-c':

        itime = ST_CTIME

        del sys.argv[1]

    elif sys.argv[1] == '-a':

        itime = ST_CTIME

        del sys.argv[1]

    else:

        itime = ST_MTIME

    secs_per_year = 365.0 * 24.0 * 3600.0   # Scale factor

    now = time.time()                       # Current time, for age computations

    status = 0                              # Exit status, set to 1 on errors

    # Compute max file name length

    maxlen = 1

    for filename in sys.argv[1:]:

        maxlen = max(maxlen, len(filename))

    # Process each argument in turn

    for filename in sys.argv[1:]:

        try:

            st = statfunc(filename)

        except os.error, msg:

            sys.stderr.write("can't stat %r: %r\n" % (filename, msg))

            status = 1

            st = ()

        if st:

            anytime = st[itime]

            size = st[ST_SIZE]

            age = now - anytime

            byteyears = float(size) * float(age) / secs_per_year

            print filename.ljust(maxlen),

            print repr(int(byteyears)).rjust(8)

    sys.exit(status)

if __name__ == '__main__':

    main()