#!/usr/bin/env python3

import argparse
import chardet
import os.path
import re
import subprocess
import sys
import tempfile

URL_REGEX = '(https?://\S*)'
ANCHOR_SUB = '<a href="\\1">\\1</a>'
HTML_PARAGRAPH = '<p>'
BROWSER_CMD = ['lynx', '-force_html', '-hiddenlinks=merge',
               '-display_charset=utf-8', '-dump']

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('input_file')
    args = parser.parse_args()
    with open(args.input_file, 'rb') as input_file:
        text = input_file.read()
    with tempfile.NamedTemporaryFile(mode='rb+') as temp_file:
        encoding = chardet.detect(text)['encoding']
        temp_file.write(bytes(str.encode(re.sub(
            URL_REGEX, ANCHOR_SUB,
            text.decode(encoding).replace('\n\n', HTML_PARAGRAPH)), encoding)))
        BROWSER_CMD.append(str(temp_file.name))
        temp_file.seek(0)
        sys.stdout.write(subprocess.check_output(BROWSER_CMD, universal_newlines=True))

if __name__ == '__main__':
    main()