#!/usr/bin/env python3"""Rebuild README.md index from topic directories.""" import osimport refrom pathlib import Path ROOT = Path(__file__).parent.resolve()INDEX_RE = re.compile(r"<!-- index starts -->.*<!-- index ends -->", re.DOTALL)COUNT_RE = re.compile(r"<!-- count starts -->\d+<!-- count ends -->") def extract_frontmatter(filepath):    text = filepath.read_text(encoding="utf-8")    if not text.startswith("---"):        return {}, text    end = text.index("---", 3)    fm_block = text[3:end].strip()    meta = {}    for line in fm_block.split("\n"):        if ":" in line and not line.startswith("  "):            key, val = line.split(":", 1)            meta[key.strip()] = val.strip().strip('"')    return meta, text[end + 3:].strip() def build_index():    by_topic = {}    total = 0    for topic_dir in sorted(ROOT.iterdir()):        if not topic_dir.is_dir() or topic_dir.name.startswith("."):            continue        entries = []        for md in sorted(topic_dir.glob("*.md")):            meta, _ = extract_frontmatter(md)            title = meta.get("title", md.stem.replace("-", " ").title())            date = meta.get("date", "")            entries.append((title, f"{topic_dir.name}/{md.name}", date))            total += 1        if entries:            by_topic[topic_dir.name] = entries     lines = ["<!-- index starts -->"]    for topic in sorted(by_topic):        lines.append(f"## {topic}\n")        for title, path, date in sorted(by_topic[topic], key=lambda x: x[2], reverse=True):            url = f"https://github.com/krisyotam/til/blob/main/{path}"            lines.append(f"* [{title}]({url}) - {date}")        lines.append("")    lines.append("<!-- index ends -->")    return "\n".join(lines), total if __name__ == "__main__":    index_text, total = build_index()    readme = ROOT / "README.md"    content = readme.read_text(encoding="utf-8")    content = INDEX_RE.sub(index_text, content)    content = COUNT_RE.sub(f"<!-- count starts -->{total}<!-- count ends -->", content)    readme.write_text(content, encoding="utf-8")    print(f"Updated README.md with {total} TILs")