#!/usr/bin/env python

"""
split paragraphs, sentences, etc
"""

# imports
import argparse
import re
import string
import sys


def findall(sub, _string):
    """find all occurances of `sub` in _string"""

    retval = []
    index = 0
    while True:
        try:
            index = _string.index(sub, index)
            retval.append(index)
            index += 1
        except ValueError:
            return retval


def split_paragraphs(text):

    lines = [line.strip() for line in text.strip().splitlines()]
    lines = [line if line else '\n'
             for line in lines]
    text = ' '.join(lines).strip()
    paragraphs = [' '.join(p) for p in text.split('\n')]
    return paragraphs

def main(args=sys.argv[1:]):
    """CLI"""

    # parse command line arguments
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument('file', nargs='?', type=argparse.FileType('r'), default=sys.stdin)
    options = parser.parse_args(args)

    # preprocess text
    text = options.file.read().strip()
    text = ' '.join(text.split())
#    paragraphs = split_paragraphs(text)

     ends = '.?!'

             for end in ends:
#    for paragraph in paragraphs:
#        print (paragraph)

if __name__ == '__main__':
    main()