Google fonts downloader script in python

gfont_downloader.py

#!/usr/bin/env python3

import os
import re
from requests import Session
from urllib.parse import urlparse, parse_qs, quote_plus
from argparse import ArgumentParser

src_url_matcher = re.compile(r'''url\(["']?([^"')]+)["']?\)''')

sess = Session()
sess.headers['User-Agent'] = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36'


def download_family(family: str):
    name = family.split(':')[0]
    font_url = 'https://fonts.googleapis.com/css2?family=%s&display=swap' % family

    print('Downloading', font_url)
    resp = sess.get(font_url)
    resp.raise_for_status()

    css = resp.text
    src_urls = {}

    def find_url(m):
        src = m.group(1)
        dst = urlparse(src).path
        src_urls[src] = dst[1:]
        return 'url(%s)' % dst

    css = src_url_matcher.sub(find_url, css)

    for src, dst in src_urls.items():
        print('Downloading', src)
        resp = sess.get(src)
        resp.raise_for_status()
        os.makedirs(os.path.dirname(dst), exist_ok=True)
        with open(dst, mode='wb', encoding=resp.encoding) as f:
            f.write(resp.content)

    css_file = os.path.join('fonts', quote_plus(name + '.css'))
    os.makedirs(os.path.dirname(css_file), exist_ok=True)
    with open(css_file, mode='w') as f:
        f.write(css)

    print('<link href="/%s" rel="stylesheet">' % css_file)


def main():
    parser = ArgumentParser()
    parser.add_argument('url', type=str, help='A google font url')
    parser.add_argument('-t', '--target', type=str, help='Target directory')

    args = parser.parse_args()
    if args.target:
        os.makedirs(args.target, exist_ok=True)
        os.chdir(args.target)

    font_url: str = args.url

    if not font_url.startswith('https://fonts.googleapis.com/'):
        raise Exception('Only google fonts are supported')

    query = parse_qs(urlparse(font_url).query)
    for family in query['family']:
        download_family(family)
        print()


if __name__ == '__main__':
    main()