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Use the new encapsulated fetchers
[paperdoorknob] / paperdoorknob.py
1 # paperdoorknob: Print glowfic
2 #
3 # This program is free software: you can redistribute it and/or modify it
4 # under the terms of the GNU General Public License as published by the
5 # Free Software Foundation, version 3.
6
7
8 from argparse import ArgumentParser
9 import itertools
10 import os.path
11 import subprocess
12
13 from typing import IO, Iterable
14
15 from bs4 import BeautifulSoup
16 from bs4.element import Tag
17 from xdg_base_dirs import xdg_cache_home
18
19 from fetch import CachingFetcher, Fetcher
20
21
22 def command_line_parser() -> ArgumentParser:
23 parser = ArgumentParser(prog='paperdoorknob', description='Print glowfic')
24 parser.add_argument(
25 '--cache_path',
26 metavar='PATH',
27 help='Where to keep the http cache (instead of %(default)s)',
28 default=os.path.join(xdg_cache_home(), "paperdoorknob"))
29 parser.add_argument(
30 '--out',
31 help='The filename stem at which to write output ' +
32 '(eg: "%(default)s" produces %(default)s.text, %(default)s.pdf, etc.)',
33 default='book')
34 parser.add_argument('--pandoc', help='Location of the pandoc executable')
35 parser.add_argument(
36 '--timeout',
37 help='How long to wait for HTTP requests, in seconds',
38 default=30)
39 parser.add_argument('url', help='URL to retrieve')
40 return parser
41
42
43 def fetch(url: str, fetcher: Fetcher) -> BeautifulSoup:
44 return BeautifulSoup(fetcher.fetch(url), 'html.parser')
45
46
47 def clean(html: BeautifulSoup) -> BeautifulSoup:
48 for eb in html.find_all("div", class_="post-edit-box"):
49 eb.decompose()
50 for footer in html.find_all("div", class_="post-footer"):
51 footer.decompose()
52 return html
53
54
55 def replies(html: BeautifulSoup) -> Iterable[Tag]:
56 def text() -> Tag:
57 body = html.body
58 assert body
59 text = body.find_next("div", class_="post-post")
60 assert isinstance(text, Tag)
61 return text
62
63 def the_replies() -> Iterable[Tag]:
64 rs = html.find_all("div", class_="post-reply")
65 assert all(isinstance(r, Tag) for r in rs)
66 return rs
67
68 return itertools.chain([text()], the_replies())
69
70
71 def html_to_tex(pandoc: str, tag: Tag) -> bytes:
72 return subprocess.run([pandoc, '--from=html', '--to=latex'],
73 input=tag.encode(),
74 stdout=subprocess.PIPE,
75 check=True).stdout
76
77
78 def process(
79 url: str,
80 fetcher: Fetcher,
81 texout: IO[bytes],
82 pandoc: str) -> None:
83 texout.write(b'\\documentclass{article}\n\\begin{document}\n')
84 html = clean(fetch(url, fetcher))
85 for r in replies(html):
86 texout.write(html_to_tex(pandoc, r))
87 texout.write(b'\\end{document}\n')
88
89
90 def main() -> None:
91 args = command_line_parser().parse_args()
92 with CachingFetcher(args.cache_path, args.timeout) as fetcher:
93 with open(args.out + '.tex', 'wb') as texout:
94 process(args.url, fetcher, texout, args.pandoc or 'pandoc')
95
96
97 if __name__ == '__main__':
98 main()