added missing presplit_sentences_json.py

"""

Usage:

python scripts/presplit_sentences_json.py <original loose json file> <output loose json file>

"""

import sys

import json

import nltk

nltk.download('punkt')

input_file = sys.argv[1]

output_file = sys.argv[2]

line_seperator = "\n"

with open(input_file, 'r') as ifile:

  with open(output_file, "w") as ofile:

    for doc in ifile.readlines():

      parsed = json.loads(doc)

      sent_list = []

      for line in parsed['text'].split('\n'):

          if line != '\n':

              sent_list.extend(nltk.tokenize.sent_tokenize(line))

      parsed['text'] = line_seperator.join(sent_list)

      ofile.write(json.dumps(parsed)+'\n')