#!/usr/bin/env node /** * md2html — Convert Markdown files to styled HTML (and optionally PDF) * with sidebar TOC + Mermaid diagrams. * * Usage: * node md2html.js [output.html] * node md2html.js --pdf [output.pdf] * * If output is omitted, writes to .html (or .pdf) alongside the source file. */ const fs = require("fs"); const path = require("path"); const { marked } = require("marked"); // ── CLI args ────────────────────────────────────────────────────────────────── const args = process.argv.slice(2); if (args.length === 0 || args.includes("--help") || args.includes("-h")) { console.log("Usage: node md2html.js [output.html]"); console.log(" node md2html.js --pdf [output.pdf]"); process.exit(0); } const pdfMode = args.includes("--pdf"); const filteredArgs = args.filter((a) => a !== "--pdf"); const inputPath = path.resolve(filteredArgs[0]); const defaultExt = pdfMode ? ".pdf" : ".html"; const outputPath = filteredArgs[1] ? path.resolve(filteredArgs[1]) : inputPath.replace(/\.md$/i, defaultExt); if (!fs.existsSync(inputPath)) { console.error(`Error: file not found — ${inputPath}`); process.exit(1); } const md = fs.readFileSync(inputPath, "utf-8"); // ── Marked setup ────────────────────────────────────────────────────────────── // Custom renderer: leave mermaid code blocks as 
 for client‑side rendering
const renderer = new marked.Renderer();
const defaultCode = renderer.code.bind(renderer);

renderer.code = function ({ text, lang }) {
  if (lang === "mermaid") {
    return `
${escapeHtml(text)}
\n`;
  }
  return defaultCode({ text, lang });
};

// Collect headings for TOC while rendering
const tocItems = [];
renderer.heading = function ({ text, depth }) {
  const slug = text
    .toLowerCase()
    .replace(/<[^>]*>/g, "")
    .replace(/[^\w\s-]/g, "")
    .replace(/\s+/g, "-")
    .replace(/-+/g, "-")
    .trim();
  tocItems.push({ text: stripHtml(text), depth, slug });
  return `${text}\n`;
};

function escapeHtml(s) {
  return s
    .replace(/&/g, "&")
    .replace(//g, ">")
    .replace(/"/g, """);
}

function stripHtml(s) {
  return s.replace(/<[^>]*>/g, "");
}

marked.setOptions({ renderer, gfm: true, breaks: false });

const bodyHtml = marked.parse(md);

// ── Build TOC HTML ────────────────────────────────────────────────────────────
function buildToc(items) {
  if (items.length === 0) return "";
  let html = "";
  let prevDepth = 0;
  for (const item of items) {
    if (item.depth > prevDepth) {
      for (let i = prevDepth; i < item.depth; i++) html += "
    ";
    } else if (item.depth < prevDepth) {
      for (let i = item.depth; i < prevDepth; i++) html += "
";
    }
    html += `
  • ${escapeHtml(item.text)}
    • \n`;
    prevDepth = item.depth;
  }
  for (let i = 0; i < prevDepth; i++) html += "";
  return html;
}

const tocHtml = buildToc(tocItems);
const docTitle = tocItems.length > 0 ? tocItems[0].text : "Document";

// ── Full HTML template ────────────────────────────────────────────────────────
const html = `




${escapeHtml(docTitle)}












    
${bodyHtml}

    








`;

if (pdfMode) {
  (async () => {
    const puppeteer = require("puppeteer-core");

    const browser = await puppeteer.launch({
      executablePath:
        process.env.CHROME_PATH || "/usr/bin/google-chrome-stable",
      args: ["--no-sandbox", "--disable-setuid-sandbox"],
    });
    const page = await browser.newPage();

    // Capture console for debugging
    page.on("console", (msg) => {
      if (msg.type() === "error") console.error("  [browser]", msg.text());
    });

    // Load the HTML content directly (no CDN scripts — we inject mermaid below)
    // Strip the CDN mermaid script so we can inject it ourselves via puppeteer
    const htmlForPdf = html.replace(
      /