one-sentence-per-line.py

#!/usr/bin/python3
# Transform text to one-sentence-per-line format.
# Bart Massey 2021-01-20

import re, sys

blank = re.compile("^[ \t]*$")
dot = re.compile("[.] ")

text = open(sys.argv[1], "r").read().splitlines()
paragraphs = []
paragraph = ""
for line in text:
    if blank.match(line):
        paragraphs.append(paragraph)
        paragraph = ""
    elif paragraph:
        paragraph += " " + line
    else:
        paragraph += line
if paragraph:
    paragraphs.append(paragraph)

text = []
for paragraph in paragraphs:
    if not paragraph:
        continue
    text.append(dot.sub(".\n", paragraph))

print("\n\n".join(text))