Workaround for https://github.com/rust-lang/rust/issues/98769

no_font_preload.py

#!/usr/bin/env python3

# Workaround for https://github.com/rust-lang/rust/issues/98769
# WebKit issue: https://bugs.webkit.org/show_bug.cgi?id=249887
#
# Modifies a lot of HTML files in <sysroot>/share/doc/rust/html
# to remove their <link rel="preload" as="font" ...> elements.

import os
from pathlib import Path
import re
import sys

if len(sys.argv) != 2:
	print(f"""
Usage:
{sys.argv[0]} <path-to-rust-sysroot>

Example:
{sys.argv[0]} ~/.rustup/toolchains/stable-aarch64-unknown-linux-gnu
""")
	sys.exit(1)

PATTERN = re.compile('<link rel="preload" as="font"[^>]+>')

def remove_font_preload(path):
	with path.open("r+", encoding="utf-8") as file:
		contents = file.read()
		file.seek(0)
		file.truncate()
		file.write(PATTERN.sub("", contents))

def iter_dir(path):
	with os.scandir(path) as entries:
		for entry in entries:
			if entry.is_dir(follow_symlinks=False):
				iter_dir(entry.path)

			if entry.is_file(follow_symlinks=False) and entry.name.endswith(".html"):
				remove_font_preload(Path(entry.path))

html_root = Path(sys.argv[1], "share", "doc", "rust", "html")

for file_name in ("settings.html", "help.html"):
	remove_font_preload(Path(html_root, file_name))

src_dir = Path(html_root, "src")
for crate in os.listdir(src_dir):
	iter_dir(Path(html_root, crate))

iter_dir(src_dir)