from __future__ import print_function, division

import os

import sys

# Internal build script for generating debugging test .so size.

# Usage:

#     python libsize.py file.so save.txt -- displays the size of file.so and, if save.txt exists, compares it to the

#                                           size in it, then overwrites save.txt with the new size for future runs.

if len(sys.argv) != 3:

    sys.exit("Invalid arguments: usage: python libsize.py file.so save.txt")

lib = sys.argv[1]

save = sys.argv[2]

if not os.path.exists(lib):

    sys.exit("Error: requested file ({}) does not exist".format(lib))

libsize = os.path.getsize(lib)

print("------", os.path.basename(lib), "file size:", libsize, end='')

if os.path.exists(save):

    with open(save) as sf:

        oldsize = int(sf.readline())

    if oldsize > 0:

        change = libsize - oldsize

        if change == 0:

            print(" (no change)")

        else:

            print(" (change of {:+} bytes = {:+.2%})".format(change, change / oldsize))

else:

    print()

with open(save, 'w') as sf:

    sf.write(str(libsize))