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import argparse

import json

from difflib import unified_diff

from typing import List

from typing import Mapping

from typing import Optional

from typing import Sequence

from typing import Tuple

from typing import Union

def _get_pretty_format(

contents: str,

indent: str,

ensure_ascii: bool = True,

sort_keys: bool = True,

top_keys: Sequence[str] = (),

) -> str:

def pairs_first(pairs: Sequence[Tuple[str, str]]) -> Mapping[str, str]:

before = [pair for pair in pairs if pair[0] in top_keys]

before = sorted(before, key=lambda x: top_keys.index(x[0]))

after = [pair for pair in pairs if pair[0] not in top_keys]

if sort_keys:

after.sort()

return dict(before + after)

json_pretty = json.dumps(

json.loads(contents, object_pairs_hook=pairs_first),

indent=indent,

ensure_ascii=ensure_ascii,

)

return f'{json_pretty}\n'

def _autofix(filename: str, new_contents: str) -> None:

print(f'Fixing file {filename}')

with open(filename, 'w', encoding='UTF-8') as f:

f.write(new_contents)

def parse_num_to_int(s: str) -> Union[int, str]:

"""Convert string numbers to int, leaving strings as is."""

try:

return int(s)

except ValueError:

return s

def parse_topkeys(s: str) -> List[str]:

return s.split(',')

def get_diff(source: str, target: str, file: str) -> str:

source_lines = source.splitlines(True)

target_lines = target.splitlines(True)

diff = unified_diff(source_lines, target_lines, fromfile=file, tofile=file)

return ''.join(diff)

def main(argv: Optional[Sequence[str]] = None) -> int:

parser = argparse.ArgumentParser()

parser.add_argument(

'--autofix',

action='store_true',

dest='autofix',

help='Automatically fixes encountered not-pretty-formatted files',

)

parser.add_argument(

'--indent',

type=parse_num_to_int,

default='2',

help=(

'The number of indent spaces or a string to be used as delimiter'

' for indentation level e.g. 4 or "\t" (Default: 2)'

)

parser.add_argument(

'--no-ensure-ascii',

action='store_true',

dest='no_ensure_ascii',

default=False,

help=(

'Do NOT convert non-ASCII characters to Unicode escape sequences '

'(\\uXXXX)'

)

parser.add_argument(

'--no-sort-keys',

action='store_true',

dest='no_sort_keys',

default=False,

help='Keep JSON nodes in the same order',

)

parser.add_argument(

'--top-keys',

type=parse_topkeys,

dest='top_keys',

default=[],

help='Ordered list of keys to keep at the top of JSON hashes',

)

parser.add_argument('filenames', nargs='*', help='Filenames to fix')

args = parser.parse_args(argv)

status = 0

for json_file in args.filenames:

with open(json_file, encoding='UTF-8') as f:

contents = f.read()

try:

pretty_contents = _get_pretty_format(

contents, args.indent, ensure_ascii=not args.no_ensure_ascii,

sort_keys=not args.no_sort_keys, top_keys=args.top_keys,

)

if contents != pretty_contents:

if args.autofix:

_autofix(json_file, pretty_contents)

else:

print(

get_diff(contents, pretty_contents, json_file),

end='',

)

status = 1

except ValueError:

print(

f'Input File {json_file} is not a valid JSON, consider using '

f'check-json',

)

return 1

return status

if __name__ == '__main__':

exit(main())

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