hykocx
0f09b30164
Introduce a Node.js CLI tool that converts Markdown files to styled
PDFs using `marked` for parsing and `puppeteer` for rendering.
- Add `md-to-pdf.js` as the main conversion script with:
- CLI argument handling for input/output file paths
- Automatic output directory creation alongside the input file
- Pre-processing to strip thematic breaks (`---`) before headings
- Embedded CSS for clean, print-ready styling (headings, tables,
code blocks, blockquotes, page breaks, etc.)
- PDF generation via Puppeteer with A4 format and custom margins
- Add `.gitignore` to exclude `node_modules/` and `output/` directories
- Add `package-lock.json` with resolved dependencies (marked, puppeteer)
244 lines
6.4 KiB
JavaScript
244 lines
6.4 KiB
JavaScript
#!/usr/bin/env node
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const fs = require('fs');
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const path = require('path');
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const { marked } = require('marked');
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const puppeteer = require('puppeteer');
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const inputFile = process.argv[2];
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if (!inputFile) {
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console.error('Usage: node md-to-pdf.js <input.md> [output/custom.pdf]');
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process.exit(1);
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}
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if (!fs.existsSync(inputFile)) {
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console.error(`File not found: ${inputFile}`);
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process.exit(1);
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}
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const outputDir = path.resolve(path.dirname(inputFile), 'output');
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if (!fs.existsSync(outputDir)) fs.mkdirSync(outputDir, { recursive: true });
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const baseName = path.basename(inputFile, path.extname(inputFile)) + '.pdf';
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const outputFile = process.argv[3]
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? path.resolve(process.argv[3])
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: path.join(outputDir, baseName);
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const rawMarkdown = fs.readFileSync(inputFile, 'utf8');
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// Remove a thematic break (---) when it is immediately followed by a heading
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// (with only blank lines in between), so it doesn't render as <hr>.
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const markdown = rawMarkdown.replace(/^---[ \t]*$(\n[ \t]*)*(?=^#{1,6}\s)/gm, '');
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const body = marked(markdown);
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const html = `<!DOCTYPE html>
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<html lang="fr">
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<head>
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<meta charset="UTF-8">
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<style>
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*, *::before, *::after {
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box-sizing: border-box;
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}
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html, body {
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margin: 0;
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padding: 0;
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background: #ffffff;
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color: #1a1a1a;
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font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
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font-size: 14px;
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line-height: 1.7;
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}
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.page {
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max-width: 860px;
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margin: 0 auto;
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padding: 40px 50px;
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}
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/* ---------- Headings ---------- */
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h1, h2, h3, h4, h5, h6 {
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font-weight: 700;
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line-height: 1.3;
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margin-top: 2em;
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margin-bottom: 0.5em;
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break-after: avoid;
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}
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.page > h1:first-child,
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.page > h2:first-child,
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.page > h3:first-child {
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margin-top: 0;
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}
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h1 { font-size: 2em; border-bottom: 2px solid #e0e0e0; padding-bottom: 0.3em; }
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h2 { font-size: 1.5em; border-bottom: 1px solid #e0e0e0; padding-bottom: 0.2em; }
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h3 { font-size: 1.2em; }
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h4 { font-size: 1em; }
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/* ---------- Paragraphs & text ---------- */
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p { margin: 0.6em 0; }
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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: 700; }
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em { font-style: italic; }
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/* ---------- Code ---------- */
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code {
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font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
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font-size: 0.88em;
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background: #f3f4f6;
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border: 1px solid #e5e7eb;
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border-radius: 4px;
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padding: 0.15em 0.4em;
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}
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pre {
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background: #f6f8fa;
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border: 1px solid #d1d5db;
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border-radius: 6px;
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padding: 1em 1.2em;
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overflow-x: auto;
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break-inside: avoid;
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margin: 1em 0;
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}
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pre code {
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background: none;
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border: none;
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padding: 0;
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font-size: 0.85em;
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line-height: 1.6;
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}
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/* ---------- Blockquote ---------- */
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blockquote {
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margin: 1em 0;
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padding: 0.6em 1.2em;
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border-left: 4px solid #0969da;
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background: #f0f6ff;
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border-radius: 0 6px 6px 0;
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break-inside: avoid;
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color: #444;
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}
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blockquote p { margin: 0; }
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/* ---------- Lists ---------- */
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ul, ol {
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margin: 0.6em 0;
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padding-left: 1.8em;
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}
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li { margin: 0.25em 0; }
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/* ---------- Horizontal rule ---------- */
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hr {
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border: none;
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border-top: 1px solid #e0e0e0;
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margin: 2em 0;
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}
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/* ---------- Tables ---------- */
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table {
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width: 100%;
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border-collapse: collapse;
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margin: 1em 0;
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font-size: 0.92em;
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break-inside: avoid;
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}
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thead {
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background: #f0f1f3;
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}
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th, td {
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border: 1px solid #d1d5db;
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padding: 0.55em 0.9em;
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text-align: left;
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vertical-align: top;
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}
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th {
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font-weight: 600;
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color: #374151;
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}
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tbody tr:nth-child(even) {
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background: #f9fafb;
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}
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/* ---------- Images ---------- */
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img {
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max-width: 100%;
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height: auto;
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border-radius: 6px;
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break-inside: avoid;
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}
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/* ---------- Page-break hints ---------- */
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p, li, blockquote, pre, img {
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break-inside: avoid;
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}
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/* Avoid orphan headings at the bottom of a page */
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h1 + *, h2 + *, h3 + *, h4 + *, h5 + *, h6 + * {
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break-before: avoid;
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}
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</style>
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</head>
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<body>
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<div class="page">
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${body}
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</div>
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</body>
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</html>`;
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(async () => {
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const browser = await puppeteer.launch({ args: ['--no-sandbox'] });
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const page = await browser.newPage();
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// Viewport très haut pour que getBoundingClientRect() retourne des coords absolues
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await page.setViewport({ width: 794, height: 100000 });
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await page.setContent(html, { waitUntil: 'networkidle0' });
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// Si un h2 tombe dans la moitié basse d'une page A4, on le pousse à la page suivante.
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// On simule la pagination avec un décalage cumulatif : chaque saut de page forcé
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// avance les positions de tous les titres suivants, évitant l'effet cascade.
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await page.evaluate(() => {
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const MM_TO_PX = 96 / 25.4;
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const PAGE_H = Math.round(297 * MM_TO_PX); // 1123px — hauteur brute A4
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const MARGIN_TOP = Math.round(15 * MM_TO_PX); // 57px
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const MARGIN_BOT = Math.round(15 * MM_TO_PX); // 57px
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const CONTENT_H = PAGE_H - MARGIN_TOP - MARGIN_BOT; // ~1009px par page
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let cumulativeShift = 0;
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document.querySelectorAll('h2').forEach(h => {
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// Position originale (layout écran, sans sauts de page CSS)
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const originalY = h.getBoundingClientRect().top;
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// Position effective après les sauts de page déjà décidés avant ce titre
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const effectiveY = originalY + cumulativeShift;
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const pageNum = Math.floor(effectiveY / CONTENT_H);
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const posInPage = effectiveY % CONTENT_H;
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if (posInPage > CONTENT_H / 2) {
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h.style.pageBreakBefore = 'always';
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// Ce titre est repoussé au début de la page suivante :
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// on calcule le décalage ajouté et on l'accumule pour les titres suivants
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const newEffectiveY = (pageNum + 1) * CONTENT_H;
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cumulativeShift += newEffectiveY - effectiveY;
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}
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});
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});
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await page.pdf({
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path: outputFile,
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format: 'A4',
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printBackground: true,
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margin: { top: '15mm', bottom: '15mm', left: '10mm', right: '10mm' },
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});
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await browser.close();
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console.log(`PDF generated: ${outputFile}`);
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})();
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