#!/usr/bin/env node
/*
* Render Mermaid code blocks in a Markdown file to SVGs,
* replace them with image links, then export the Markdown to PDF.
*
* Usage:
* node scripts/md_mermaid_to_pdf.js <input.md> <output.pdf>
*/
import fs from 'fs';
import path from 'path';
import { execSync } from 'child_process';
import { pathToFileURL } from 'url';
function run(cmd) {
execSync(cmd, { stdio: 'pipe' });
}
function ensureDir(p) {
if (!fs.existsSync(p)) fs.mkdirSync(p, { recursive: true });
}
export function convertMarkdownWithMermaidToPdf(inputMd, outputPdf) {
const inputAbs = path.resolve(inputMd);
const outputAbs = path.resolve(outputPdf);
const docsDir = path.dirname(inputAbs);
const outDir = path.join(docsDir, '.out');
ensureDir(outDir);
const md = fs.readFileSync(inputAbs, 'utf8');
const mermaidRegex = /```mermaid\s*([\s\S]*?)```/g;
let match;
let index = 0;
let renderedMd = md;
// Collect replacements to avoid messing indices while replacing
const replacements = [];
while ((match = mermaidRegex.exec(md)) !== null) {
index += 1;
const code = match[1];
const base = `diagram_${index}`;
const mmdPath = path.join(outDir, `${base}.mmd`);
const svgPath = path.join(outDir, `${base}.svg`);
fs.writeFileSync(mmdPath, code, 'utf8');
// Render to SVG via mermaid-cli
run(`npx -y @mermaid-js/mermaid-cli -i '${mmdPath}' -o '${svgPath}' -t neutral`);
const imgMarkdown = `})`;
const replacement = imgMarkdown;
replacements.push({ from: match[0], to: replacement });
}
// Apply replacements
for (const r of replacements) {
renderedMd = renderedMd.replace(r.from, r.to);
}
const renderedMdPath = path.join(outDir, path.basename(inputAbs).replace(/\.md$/, '.rendered.md'));
fs.writeFileSync(renderedMdPath, renderedMd, 'utf8');
// Convert to PDF (try md-to-pdf without explicit output, then move file; fallback to pandoc)
let producedPdf;
try {
run(`npx -y md-to-pdf '${renderedMdPath}'`);
producedPdf = renderedMdPath.replace(/\.md$/, '.pdf');
if (!fs.existsSync(producedPdf)) {
throw new Error(`Expected output not found: ${producedPdf}`);
}
ensureDir(path.dirname(outputAbs));
fs.copyFileSync(producedPdf, outputAbs);
} catch (e) {
try {
run(`pandoc -f gfm -o '${outputAbs}' '${renderedMdPath}'`);
} catch (e2) {
console.error('Failed to convert to PDF with both md-to-pdf and pandoc');
process.exit(2);
}
}
if (!process.env.MCP_SILENT) {
console.log(`PDF written: ${outputAbs}`);
}
return outputAbs;
}
function main() {
const [inputMd, outputPdf] = process.argv.slice(2);
if (!inputMd || !outputPdf) {
console.error('Usage: node scripts/md_mermaid_to_pdf.js <input.md> <output.pdf>');
process.exit(1);
}
convertMarkdownWithMermaidToPdf(inputMd, outputPdf);
}
// ESM CLI entry guard
try {
if (import.meta.url === pathToFileURL(process.argv[1]).href) {
main();
}
} catch {}
