microblog.pub/app/utils/highlight.py

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2022-06-22 13:11:22 -05:00
from functools import lru_cache
from bs4 import BeautifulSoup # type: ignore
from pygments import highlight as phighlight # type: ignore
from pygments.formatters import HtmlFormatter # type: ignore
from pygments.lexers import guess_lexer # type: ignore
_FORMATTER = HtmlFormatter(style="vim")
HIGHLIGHT_CSS = _FORMATTER.get_style_defs()
@lru_cache(256)
def highlight(html: str) -> str:
soup = BeautifulSoup(html, "html5lib")
for code in soup.find_all("code"):
if not code.parent.name == "pre":
continue
lexer = guess_lexer(code.text)
tag = BeautifulSoup(
phighlight(code.text, lexer, _FORMATTER), "html5lib"
).body.next
pre = code.parent
pre.replaceWith(tag)
out = soup.body
out.name = "div"
return str(out)