from __future__ import print_function

import sys

def nad_extract(fn):

    print_once = False
    printing = False

    for line in open(fn):
        if line.startswith("NA Digest"):
            print_once = True
            fields = line.split()
            line = "\n\n<a href=%s%s%s><h4>" % ('"', fn+".html", '"') + fields[1] + " for " + " ".join(fields[2:-5]) + "</h4></a>" + "\n"

        elif line.startswith("Today's Topics:"):
            printing = True
            line = "\n<h4>In this digest:</h4>\n\n<pre>\n"

        elif line.startswith("Subscribe, "):
            printing = False
            line = "</pre>"
            print_once = True

        elif line.startswith("  "):
            line = line.strip() + "\n"

        elif line.startswith("\t"):
            line = line.strip() + "\n"

        elif line.startswith("\n"):
            line = ""

        if printing or print_once:
            print(line, end="")

        print_once = False

def main(argv):
    file_names = argv[1:]
    file_names.reverse()
    for fn in file_names:
        nad_extract(fn)
    return 0

sys.exit(main(sys.argv))

.