File: jsonl.py
   1 #!/usr/bin/python3
   2 
   3 # The MIT License (MIT)
   4 #
   5 # Copyright © 2024 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 jsonl [filepath/URI...]
  32 
  33 JSON Lines turns valid JSON-input arrays into separate JSON lines, one for
  34 each top-level item. Non-arrays result in a single JSON-line.
  35 
  36 When not given a filepath or URI to load, standard input is used instead.
  37 Every output line is always a single top-level item from the input.
  38 '''
  39 
  40 # handle standard help cmd-line options, quitting right away in that case
  41 if len(argv) == 2 and argv[1] in ('-h', '--h', '-help', '--help'):
  42     print(info.strip())
  43     exit(0)
  44 
  45 
  46 def jsonl(w, src) -> None:
  47     data = load(src)
  48     if isinstance(data, (list, tuple)):
  49         for v in data:
  50             emit(w, v)
  51     else:
  52         emit(w, data)
  53 
  54 
  55 def emit(w, v) -> None:
  56     dump(v, w, indent=None, allow_nan=False, separators=(', ', ': '))
  57     w.write('\n')
  58 
  59 
  60 def seems_url(s: str) -> bool:
  61     protocols = ('https://', 'http://', 'file://', 'ftp://', 'data:')
  62     return any(s.startswith(p) for p in protocols)
  63 
  64 
  65 try:
  66     if len(argv) < 2:
  67         jsonl(stdout, stdin.buffer)
  68     elif len(argv) == 2:
  69         name = argv[1]
  70         if name == '-':
  71             jsonl(stdout, stdin.buffer)
  72         elif seems_url(name):
  73             from urllib.request import urlopen
  74             with urlopen(name) as inp:
  75                 jsonl(stdout, inp)
  76         else:
  77             with open(name, mode='rb') as inp:
  78                 jsonl(stdout, inp)
  79     else:
  80         raise ValueError('multiple inputs not allowed')
  81 except BrokenPipeError:
  82     # quit quietly, instead of showing a confusing error message
  83     stderr.close()
  84     exit(0)
  85 except KeyboardInterrupt:
  86     # stderr.close()
  87     exit(2)
  88 except Exception as e:
  89     print(f'\x1b[31m{e}\x1b[0m', file=stderr)
  90     exit(1)