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7d2c39752f
As argparse now detects by default when the code was run as a module.
This leads to using the actual executable name instead of simply "python"
to display in the usage message ("usage: python -m ...").
82 lines
3.2 KiB
Python
82 lines
3.2 KiB
Python
"""Command-line tool to validate and pretty-print JSON
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See `json.__main__` for a usage example (invocation as
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`python -m json.tool` is supported for backwards compatibility).
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"""
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import argparse
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import json
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import sys
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def main():
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description = ('A simple command line interface for json module '
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'to validate and pretty-print JSON objects.')
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parser = argparse.ArgumentParser(description=description)
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parser.add_argument('infile', nargs='?',
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help='a JSON file to be validated or pretty-printed',
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default='-')
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parser.add_argument('outfile', nargs='?',
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help='write the output of infile to outfile',
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default=None)
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parser.add_argument('--sort-keys', action='store_true', default=False,
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help='sort the output of dictionaries alphabetically by key')
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parser.add_argument('--no-ensure-ascii', dest='ensure_ascii', action='store_false',
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help='disable escaping of non-ASCII characters')
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parser.add_argument('--json-lines', action='store_true', default=False,
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help='parse input using the JSON Lines format. '
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'Use with --no-indent or --compact to produce valid JSON Lines output.')
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group = parser.add_mutually_exclusive_group()
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group.add_argument('--indent', default=4, type=int,
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help='separate items with newlines and use this number '
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'of spaces for indentation')
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group.add_argument('--tab', action='store_const', dest='indent',
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const='\t', help='separate items with newlines and use '
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'tabs for indentation')
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group.add_argument('--no-indent', action='store_const', dest='indent',
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const=None,
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help='separate items with spaces rather than newlines')
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group.add_argument('--compact', action='store_true',
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help='suppress all whitespace separation (most compact)')
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options = parser.parse_args()
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dump_args = {
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'sort_keys': options.sort_keys,
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'indent': options.indent,
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'ensure_ascii': options.ensure_ascii,
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}
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if options.compact:
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dump_args['indent'] = None
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dump_args['separators'] = ',', ':'
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try:
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if options.infile == '-':
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infile = sys.stdin
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else:
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infile = open(options.infile, encoding='utf-8')
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try:
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if options.json_lines:
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objs = (json.loads(line) for line in infile)
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else:
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objs = (json.load(infile),)
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finally:
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if infile is not sys.stdin:
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infile.close()
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if options.outfile is None:
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outfile = sys.stdout
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else:
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outfile = open(options.outfile, 'w', encoding='utf-8')
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with outfile:
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for obj in objs:
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json.dump(obj, outfile, **dump_args)
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outfile.write('\n')
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except ValueError as e:
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raise SystemExit(e)
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if __name__ == '__main__':
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try:
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main()
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except BrokenPipeError as exc:
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raise SystemExit(exc.errno)
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