#!/usr/bin/python3

# The MIT License (MIT)
#
# Copyright © 2020-2025 pacman64
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the “Software”), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.


from json import load, dump
from sys import argv, exit, stderr, stdin, stdout


info = '''
jsonl [filepath/URI...]

JSON Lines turns valid JSON-input arrays into separate JSON lines, one for
each top-level item. Non-arrays result in a single JSON-line.

When not given a filepath or URI to load, standard input is used instead.
Every output line is always a single top-level item from the input.
'''

# handle standard help cmd-line options, quitting right away in that case
if len(argv) == 2 and argv[1] in ('-h', '--h', '-help', '--help'):
    print(info.strip())
    exit(0)


def jsonl(w, src) -> None:
    data = load(src)
    if isinstance(data, (list, tuple)):
        for v in data:
            emit(w, v)
    else:
        emit(w, data)


def emit(w, v) -> None:
    dump(v, w, indent=None, allow_nan=False, separators=(', ', ': '))
    w.write('\n')


def seems_url(s: str) -> bool:
    protocols = ('https://', 'http://', 'file://', 'ftp://', 'data:')
    return any(s.startswith(p) for p in protocols)


try:
    if len(argv) < 2:
        jsonl(stdout, stdin.buffer)
    elif len(argv) == 2:
        name = argv[1]
        if name == '-':
            jsonl(stdout, stdin.buffer)
        elif seems_url(name):
            from urllib.request import urlopen
            with urlopen(name) as inp:
                jsonl(stdout, inp)
        else:
            with open(name, mode='rb') as inp:
                jsonl(stdout, inp)
    else:
        raise ValueError('multiple inputs not allowed')
except BrokenPipeError:
    # quit quietly, instead of showing a confusing error message
    stderr.close()
    exit(0)
except KeyboardInterrupt:
    exit(2)
except Exception as e:
    print(f'\x1b[31m{e}\x1b[0m', file=stderr)
    exit(1)