json-print

#!/usr/bin/env python
# (c) Copyright 2020 Jonathan Simmonds
# Tiny script to pretty print JSON.
import json, os, sys

def usage(script_name):
    print "usage: %s [-h] [input]" % (script_name)
    print ""
    print "Pretty-prints JSON. Input can either be given as an argument"
    print "or via stdin."
    print ""
    print "optional arguments:"
    print "  -h, --help     Print this message and exit."
    sys.exit(1)

# Work out what functionality we are trying to provide.
script_name = os.path.basename(sys.argv[0])
# Parse the command line.
argc = len(sys.argv)
lines = []
if argc == 1 and not sys.stdin.isatty():
    for line in sys.stdin:
        lines.append(line)
elif argc == 2:
    arg = sys.argv[1]
    if arg == "-h" or arg == "-help" or arg == "--help":
        usage(script_name)
    lines.append(arg)
else:
    usage(script_name)

# Actual implemetation...
print json.dumps(json.loads(''.join(lines)), indent=2, sort_keys=True)