#!/usr/bin/env python

# Sort JSON file and print in fixed format
# This lowers git diffs when a file has only changed by whitespace.


import argparse
import json
import os


def main(json_file_path, skip_missing_file):
    if not os.path.isfile(json_file_path) and skip_missing_file:
        return

    with open(json_file_path, 'r') as fh:
        loaded_json = json.load(fh)

    with open(json_file_path, 'w') as fh:
        json.dump(loaded_json, fh, indent=4, sort_keys=True)


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Sort and format JSON file.')
    parser.add_argument('json_file', metavar='FILE', type=str, help='JSON file to sort in place.')
    parser.add_argument('--skip-missing-file', default=False, action='store_true', help='Do not fail on missing file.')

    args = parser.parse_args()
    main(args.json_file, args.skip_missing_file)