File gluon/contrib/simplejson/tool.py artifact b47035ef9b part of check-in c5a2ec2308

r"""Command-line tool to validate and pretty-print JSON

Usage::

    $ echo '{"json":"obj"}' | python -m simplejson.tool
    {
        "json": "obj"
    }
    $ echo '{ 1.2:3.4}' | python -m simplejson.tool
    Expecting property name: line 1 column 2 (char 2)

"""
import sys
import simplejson as json

def main():
    if len(sys.argv) == 1:
        infile = sys.stdin
        outfile = sys.stdout
    elif len(sys.argv) == 2:
        infile = open(sys.argv[1], 'rb')
        outfile = sys.stdout
    elif len(sys.argv) == 3:
        infile = open(sys.argv[1], 'rb')
        outfile = open(sys.argv[2], 'wb')
    else:
        raise SystemExit(sys.argv[0] + " [infile [outfile]]")
    try:
        try:
            obj = json.load(infile,
                            object_pairs_hook=json.OrderedDict,
                            use_decimal=True)
        except ValueError, e:
            raise SystemExit(e)
        json.dump(obj, outfile, sort_keys=True, indent='    ', use_decimal=True)
        outfile.write('\n')
    finally:
        infile.close()
        outfile.close()

if __name__ == '__main__':
    main()