Small curly-brace validator for anything. (Used for Valve Data Format)

vdf-validator.py

#!/usr/bin/env python
import sys
import os

counter = 0
with open(sys.argv[1], "r") as fd:
    while True:
        c = fd.read(1)
        if (c == '{'):
            counter += 1
        elif (c == '}'):
            counter -= 1
        elif not c:
            break

    if counter != 0:
        print(f"{sys.argv[1]}: FAIL")