File: json2.py
   1 #!/usr/bin/python
   2 
   3 # The MIT License (MIT)
   4 #
   5 # Copyright (c) 2026 pacman64
   6 #
   7 # Permission is hereby granted, free of charge, to any person obtaining a copy
   8 # of this software and associated documentation files (the "Software"), to deal
   9 # in the Software without restriction, including without limitation the rights
  10 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11 # copies of the Software, and to permit persons to whom the Software is
  12 # furnished to do so, subject to the following conditions:
  13 #
  14 # The above copyright notice and this permission notice shall be included in
  15 # all copies or substantial portions of the Software.
  16 #
  17 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23 # SOFTWARE.
  24 
  25 
  26 from json import load, dump
  27 from sys import argv, exit, stderr, stdin, stdout
  28 
  29 
  30 info = '''
  31 json2 [options...] [filepath/URI...]
  32 
  33 JSON-2 reformats valid JSON input into indented multi-line JSON output,
  34 using 2 spaces for each indentation level.
  35 
  36 All (optional) leading options start with either single or double-dash:
  37 
  38     -h, -help    show this help message
  39 '''
  40 
  41 # handle standard help cmd-line options, quitting right away in that case
  42 if len(argv) > 1 and argv[1] in ('-h', '--h', '-help', '--help'):
  43     print(info.strip())
  44     exit(0)
  45 
  46 
  47 def json2(w, src):
  48     dump(load(src), w, indent=2, separators=(',', ': '),
  49         allow_nan=False, check_circular=False)
  50     w.write('\n')
  51 
  52 
  53 def seems_url(s):
  54     protocols = ('https://', 'http://', 'file://', 'ftp://', 'data:')
  55     return any(s.startswith(p) for p in protocols)
  56 
  57 
  58 args = argv[1:]
  59 
  60 if len(args) > 0:
  61     s = args[0]
  62     if s != '-' and s != '--' and s.startswith('-'):
  63         print(f'json2: unsupported option {s}')
  64         exit(1)
  65 
  66 if len(args) > 0 and args[0] == '--':
  67     args = args[1:]
  68 
  69 try:
  70     if len(args) > 1:
  71         raise ValueError('json2: multiple inputs not allowed')
  72     name = args[0] if len(args) > 0 else '-'
  73 
  74     if name == '-':
  75         json2(stdout, stdin.buffer)
  76     elif seems_url(name):
  77         from urllib.request import urlopen
  78         with urlopen(name) as inp:
  79             json2(stdout, inp)
  80     else:
  81         with open(name, mode='rb') as inp:
  82             json2(stdout, inp)
  83 except BrokenPipeError:
  84     # quit quietly, instead of showing a confusing error message
  85     stderr.close()
  86 except KeyboardInterrupt:
  87     exit(2)
  88 except Exception as e:
  89     print(str(e), file=stderr)
  90     exit(1)