Alex Zaw
9c5046de7b
- Refactor conversion logic into reusable convert.js module - Add HTTP server with upload UI, HTML/PDF download, and live preview - Dockerfile with Chromium for server-side PDF rendering - Local mermaid.min.js injection for offline diagram rendering Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
278 lines
7.5 KiB
JavaScript
278 lines
7.5 KiB
JavaScript
const fs = require("fs");
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const path = require("path");
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const { marked } = require("marked");
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function escapeHtml(s) {
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return s
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.replace(/&/g, "&")
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.replace(/</g, "<")
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.replace(/>/g, ">")
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.replace(/"/g, """);
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}
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function stripHtml(s) {
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return s.replace(/<[^>]*>/g, "");
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}
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function buildToc(items) {
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if (items.length === 0) return "";
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let html = "";
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let prevDepth = 0;
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for (const item of items) {
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if (item.depth > prevDepth) {
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for (let i = prevDepth; i < item.depth; i++) html += "<ul>";
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} else if (item.depth < prevDepth) {
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for (let i = item.depth; i < prevDepth; i++) html += "</ul>";
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}
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html += `<li><a href="#${item.slug}">${escapeHtml(item.text)}</a></li>\n`;
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prevDepth = item.depth;
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}
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for (let i = 0; i < prevDepth; i++) html += "</ul>";
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return html;
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}
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function markdownToHtml(md) {
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const renderer = new marked.Renderer();
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const defaultCode = renderer.code.bind(renderer);
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renderer.code = function ({ text, lang }) {
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if (lang === "mermaid") {
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return `<pre class="mermaid">${escapeHtml(text)}</pre>\n`;
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}
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return defaultCode({ text, lang });
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};
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const tocItems = [];
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renderer.heading = function ({ text, depth }) {
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const slug = text
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.toLowerCase()
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.replace(/<[^>]*>/g, "")
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.replace(/[^\w\s-]/g, "")
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.replace(/\s+/g, "-")
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.replace(/-+/g, "-")
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.trim();
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tocItems.push({ text: stripHtml(text), depth, slug });
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return `<h${depth} id="${slug}">${text}</h${depth}>\n`;
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};
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marked.setOptions({ renderer, gfm: true, breaks: false });
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const bodyHtml = marked.parse(md);
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const tocHtml = buildToc(tocItems);
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const docTitle = tocItems.length > 0 ? tocItems[0].text : "Document";
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return `<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>${escapeHtml(docTitle)}</title>
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<style>
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*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
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html { font-size: 16px; scroll-behavior: smooth; }
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body {
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font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
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color: #24292f;
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background: #ffffff;
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line-height: 1.6;
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display: flex;
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min-height: 100vh;
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}
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#toc-sidebar {
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position: fixed;
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top: 0; left: 0;
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width: 280px;
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height: 100vh;
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overflow-y: auto;
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background: #f6f8fa;
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border-right: 1px solid #d0d7de;
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padding: 20px 16px;
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font-size: 0.85rem;
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z-index: 10;
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}
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#toc-sidebar ul { list-style: none; padding-left: 0; }
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#toc-sidebar ul ul { padding-left: 16px; }
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#toc-sidebar li { margin: 3px 0; }
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#toc-sidebar a {
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color: #0969da;
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text-decoration: none;
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display: block;
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padding: 2px 6px;
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border-radius: 4px;
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overflow: hidden;
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text-overflow: ellipsis;
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white-space: nowrap;
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}
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#toc-sidebar a:hover { background: #ddf4ff; }
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#toc-sidebar a.active { background: #0969da; color: #fff; }
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#toc-toggle {
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display: none;
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position: fixed;
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top: 12px; left: 12px;
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z-index: 20;
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background: #f6f8fa;
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border: 1px solid #d0d7de;
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border-radius: 6px;
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padding: 6px 10px;
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cursor: pointer;
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font-size: 1.1rem;
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}
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#content {
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margin-left: 280px;
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max-width: 920px;
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padding: 40px 48px 80px;
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width: 100%;
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}
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h1, h2, h3, h4, h5, h6 {
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margin-top: 1.8em;
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margin-bottom: 0.6em;
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font-weight: 600;
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line-height: 1.25;
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color: #1f2328;
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}
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h1 { font-size: 2em; border-bottom: 1px solid #d0d7de; padding-bottom: 0.3em; }
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h2 { font-size: 1.5em; border-bottom: 1px solid #d0d7de; padding-bottom: 0.3em; }
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h3 { font-size: 1.25em; }
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h1:first-child { margin-top: 0; }
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p { margin: 0 0 1em; }
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a { color: #0969da; text-decoration: none; }
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a:hover { text-decoration: underline; }
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strong { font-weight: 600; }
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hr { border: none; border-top: 1px solid #d0d7de; margin: 2em 0; }
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ul, ol { margin: 0 0 1em 2em; }
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li + li { margin-top: 0.25em; }
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table {
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border-collapse: collapse;
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width: 100%;
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margin: 0 0 1em;
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font-size: 0.9rem;
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}
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th, td { border: 1px solid #d0d7de; padding: 8px 12px; text-align: left; }
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th { background: #f6f8fa; font-weight: 600; }
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tr:nth-child(even) { background: #f6f8fa; }
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code {
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font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
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font-size: 0.875em;
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background: #f6f8fa;
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padding: 0.2em 0.4em;
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border-radius: 4px;
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}
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pre {
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background: #f6f8fa;
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border: 1px solid #d0d7de;
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border-radius: 6px;
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padding: 16px;
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overflow-x: auto;
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margin: 0 0 1em;
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line-height: 1.45;
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}
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pre code { background: none; padding: 0; font-size: 0.85rem; }
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pre.mermaid {
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background: #fff;
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border: 1px solid #d0d7de;
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text-align: center;
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padding: 20px;
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}
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@media (max-width: 900px) {
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#toc-sidebar { transform: translateX(-100%); transition: transform 0.25s; }
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#toc-sidebar.open { transform: translateX(0); }
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#toc-toggle { display: block; }
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#content { margin-left: 0; padding: 40px 24px 80px; }
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}
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@media print {
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#toc-sidebar, #toc-toggle { display: none; }
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#content { margin-left: 0; max-width: 100%; padding: 0; }
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pre.mermaid { border: none; }
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h1, h2 { break-after: avoid; }
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table { break-inside: avoid; }
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}
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</style>
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</head>
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<body>
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<button id="toc-toggle" onclick="document.getElementById('toc-sidebar').classList.toggle('open')" aria-label="Toggle table of contents">☰</button>
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<nav id="toc-sidebar">
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${tocHtml}
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</nav>
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<main id="content">
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${bodyHtml}
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</main>
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<script src="https://cdn.jsdelivr.net/npm/mermaid@11/dist/mermaid.min.js"></script>
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<script>
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mermaid.initialize({
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startOnLoad: true,
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theme: "default",
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flowchart: { useMaxWidth: true, htmlLabels: true, curve: "basis" },
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securityLevel: "loose"
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});
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</script>
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<script>
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(function () {
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const links = document.querySelectorAll("#toc-sidebar a");
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const headings = [];
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links.forEach(function (a) {
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const id = a.getAttribute("href").slice(1);
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const el = document.getElementById(id);
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if (el) headings.push({ el: el, a: a });
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});
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if (headings.length === 0) return;
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function onScroll() {
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let current = headings[0];
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for (const h of headings) {
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if (h.el.getBoundingClientRect().top <= 80) current = h;
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}
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links.forEach(function (a) { a.classList.remove("active"); });
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current.a.classList.add("active");
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}
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window.addEventListener("scroll", onScroll, { passive: true });
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onScroll();
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})();
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</script>
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</body>
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</html>`;
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}
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async function htmlToPdf(html) {
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const puppeteer = require("puppeteer-core");
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const browser = await puppeteer.launch({
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executablePath: process.env.CHROME_PATH || "/usr/bin/google-chrome-stable",
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args: ["--no-sandbox", "--disable-setuid-sandbox"],
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});
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const page = await browser.newPage();
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const htmlForPdf = html.replace(
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/<script src="https:\/\/cdn\.jsdelivr\.net\/npm\/mermaid@[^"]*"><\/script>/,
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""
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);
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await page.setContent(htmlForPdf, { waitUntil: "domcontentloaded" });
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const hasMermaid = await page.evaluate(
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() => document.querySelectorAll("pre.mermaid").length > 0
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);
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if (hasMermaid) {
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const mermaidJs = fs.readFileSync(
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path.join(__dirname, "mermaid.min.js"),
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"utf-8"
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);
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await page.addScriptTag({ content: mermaidJs });
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await page.evaluate(() => {
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mermaid.initialize({
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startOnLoad: false,
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theme: "default",
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flowchart: { useMaxWidth: true, htmlLabels: true, curve: "basis" },
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securityLevel: "loose",
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});
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return mermaid.run({ querySelector: "pre.mermaid" });
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});
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}
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const pdfBuffer = await page.pdf({
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format: "A4",
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printBackground: true,
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margin: { top: "20mm", bottom: "20mm", left: "15mm", right: "15mm" },
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});
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await browser.close();
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return pdfBuffer;
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}
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module.exports = { markdownToHtml, htmlToPdf };
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