check-json-serialization.py

#!/usr/bin/env python

"""Identify loader JSON files which have been hand-edited.

We try to store the serialized JSON files used by the loader as the
standard library would print it using 2-space indents. This makes
it easier to get useful output from `git diff` to identify the
real changes. Run this from the directory in which this script lives
(the parent directory of the Loader subdirectory).
"""

import argparse
import json
import glob

FILL = "."

parser = argparse.ArgumentParser()
parser.add_argument("--directory", "-d", default="Loader")
opts = parser.parse_args()
names = []
longest = 0
for name in glob.glob(f"{opts.directory}/*.json"):
    longest = max(longest, len(name))
    names.append(name)
for name in sorted(names):
    with open(name) as fp:
        json_string = fp.read().strip()
        try:
            values = json.loads(json_string)
        except Exception:
            print(f"{name:{FILL}<{longest+3}}malformed")
            continue
        else:
            if json_string == json.dumps(values, indent=2):
                print(f"{name:{FILL}<{longest+3}}ok")
            else:
                print(f"{name:{FILL}<{longest+3}}hand-edited")