print_specfile.py

#!/usr/bin/env python

import json
import sys


def pprint_specfile(path, filters):

    record_fmt = '{r[name]}: {r[label]}'
    field_fmt = '    {f[order]}-{f[name]}'

    with open(path) as fh:
        data = json.load(fh)

    for record in data:
        if filters and record['name'] not in filters:
            continue
        print(record_fmt.format(r=record))
        for field in record['fields']:
            print(field_fmt.format(f=field))


if __name__ == '__main__':
    path, *filters = sys.argv[1:]
    pprint_specfile(path, filters)