Bencodex diff

README.rst

Comparing two Bencodex binary files

A small CLI program to easily compare two Bencodex trees:

$ pip3 install --user -r requirements.txt
$ ./bdiff.py ./a.dat ./b.dat
--- a.dat
+++ b.dat
  {'bar': [None, 1, 2, 3],
   'baz': {b'\x00\x01': 'a', b'\x02': 'b'},
-  'foo': [True, False],
+  'foo': [True, False, 'added'],
?                     +++++++++
   'qux': None,
   'quxx': {'a': 1, 'b': 2, 'c': 3}}

bdiff.py

#!/usr/bin/env python3
import difflib
import pprint
import sys

from bencodex import load


def read_format(path):
    with open(path, 'rb') as f:
        tree = load(f)
    lines = pprint.pformat(tree).splitlines(keepends=True)
    if lines and not lines[-1].endswith('\n'):
        lines[-1] += '\n'
    return lines


def main():
    if len(sys.argv) < 3:
        print('error: too few arguments', file=sys.stderr)
        print('usage:', sys.argv[0], 'FILE FILE', file=sys.stderr)
        raise SystemExit(1)
    print('---', sys.argv[1])
    print('+++', sys.argv[2])
    a = read_format(sys.argv[1])
    b = read_format(sys.argv[2])
    d = difflib.Differ()
    result = d.compare(a, b)
    sys.stdout.writelines(result)


if __name__ == '__main__':
    main()

requirements.txt

bencodex >= 1.0.1, < 1.1.0