json2toml

#!/usr/bin/env python3
# SPDX-License-Identifier: WTFPL

# /// script
# dependencies = ["tomlkit"]
# ///

import argparse
import json
import locale
import signal
import sys

import tomlkit


def _parse_dict(d):
    d = d.copy()
    for k, v in list(d.items()):
        if isinstance(v, str) and "\n" in v:
            d[k] = tomlkit.string(v, multiline=True)
    return d


def main():
    locale.setlocale(locale.LC_ALL, "")

    signal.signal(signal.SIGINT, signal.SIG_DFL)
    signal.signal(signal.SIGPIPE, signal.SIG_DFL)

    argparser = argparse.ArgumentParser(epilog="Outputs TOML to stdout")
    argparser.add_argument(
        "--multiline-strings", action="store_const", const=_parse_dict,
        help="Use multiline syntax for strings with multiple lines",
    )
    argparser.add_argument(
        "file", nargs="?", default="-",
        help="Input file to read, or '-' for stdin (default)",
    )
    args = argparser.parse_args()

    if args.file == "-":
        fp = sys.stdin.buffer
    else:
        fp = open(args.file, "rb")

    with fp:
        d = json.load(fp, object_hook=args.multiline_strings)
    tomlkit.dump(d, sys.stdout)


if __name__ == "__main__":
    main()