jpayne@68: r"""Command-line tool to validate and pretty-print JSON
jpayne@68: 
jpayne@68: Usage::
jpayne@68: 
jpayne@68:     $ echo '{"json":"obj"}' | python -m json.tool
jpayne@68:     {
jpayne@68:         "json": "obj"
jpayne@68:     }
jpayne@68:     $ echo '{ 1.2:3.4}' | python -m json.tool
jpayne@68:     Expecting property name enclosed in double quotes: line 1 column 3 (char 2)
jpayne@68: 
jpayne@68: """
jpayne@68: import argparse
jpayne@68: import json
jpayne@68: import sys
jpayne@68: 
jpayne@68: 
jpayne@68: def main():
jpayne@68:     prog = 'python -m json.tool'
jpayne@68:     description = ('A simple command line interface for json module '
jpayne@68:                    'to validate and pretty-print JSON objects.')
jpayne@68:     parser = argparse.ArgumentParser(prog=prog, description=description)
jpayne@68:     parser.add_argument('infile', nargs='?',
jpayne@68:                         type=argparse.FileType(encoding="utf-8"),
jpayne@68:                         help='a JSON file to be validated or pretty-printed',
jpayne@68:                         default=sys.stdin)
jpayne@68:     parser.add_argument('outfile', nargs='?',
jpayne@68:                         type=argparse.FileType('w', encoding="utf-8"),
jpayne@68:                         help='write the output of infile to outfile',
jpayne@68:                         default=sys.stdout)
jpayne@68:     parser.add_argument('--sort-keys', action='store_true', default=False,
jpayne@68:                         help='sort the output of dictionaries alphabetically by key')
jpayne@68:     parser.add_argument('--json-lines', action='store_true', default=False,
jpayne@68:                         help='parse input using the jsonlines format')
jpayne@68:     options = parser.parse_args()
jpayne@68: 
jpayne@68:     infile = options.infile
jpayne@68:     outfile = options.outfile
jpayne@68:     sort_keys = options.sort_keys
jpayne@68:     json_lines = options.json_lines
jpayne@68:     with infile, outfile:
jpayne@68:         try:
jpayne@68:             if json_lines:
jpayne@68:                 objs = (json.loads(line) for line in infile)
jpayne@68:             else:
jpayne@68:                 objs = (json.load(infile), )
jpayne@68:             for obj in objs:
jpayne@68:                 json.dump(obj, outfile, sort_keys=sort_keys, indent=4)
jpayne@68:                 outfile.write('\n')
jpayne@68:         except ValueError as e:
jpayne@68:             raise SystemExit(e)
jpayne@68: 
jpayne@68: 
jpayne@68: if __name__ == '__main__':
jpayne@68:     main()