szkrd/md2pdf.js

## md2pdf.js
// first: `npm init -- yes && npm i -S showdown@1.9.1 github-markdown-css@5.1.0 serve@13.0.2 puppeteer-core`
// then: `node . --help`
const fs = require('fs');
const http = require('http');
const puppeteer = require('puppeteer-core');
const showdown = require('showdown');
const githubMarkdownCss = fs.readFileSync(require.resolve('github-markdown-css'), 'utf8');
const handler = require('serve-handler'); // without serve loading local files, like images, would not be possible

const die = (text = '', code = 1) => process.exit(~~console.error(text) + code);
const ifHasParam = (s = '') => process.argv.includes(s);
const paramValueOf = (s = '') => (process.argv.find(x => x.startsWith(`${s}=`)) || '').split('=')[1];
const asNum = (s = '') => (s || '').substr(0, 5).replace(/[^\d\.]/g, '');

const VERSION = '1.2.0';
const PDF_FORMAT = paramValueOf('--format') ?? 'A4';
const MARGIN_CM = parseFloat(asNum(paramValueOf('--margin') ?? '1')) || 0;
const PORT = parseInt(asNum(paramValueOf('--port')), 10) || 31234;
const DEBUG = ifHasParam('--debug');
let BROWSER_PATH = paramValueOf('--browser');
if (!BROWSER_PATH && process.platform === 'linux') BROWSER_PATH = '/usr/bin/chromium';
if (!BROWSER_PATH && process.platform === 'win32') BROWSER_PATH = 'C:/Program Files/Google/Chrome/Application/chrome.exe';
if (!BROWSER_PATH && process.platform === 'darwin') BROWSER_PATH = '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome';

let info = '';
if (ifHasParam('--version')) info = `v${VERSION}`;
if (ifHasParam('--help')) info = 'Params (all optional):\n--help\n--version\n--port=31234\n--margin=1' +
  '\n--debug\n--format=A4\n--browser=/usr/bin/chromium\n\nExample: node md2pdf sample.md';
if (info) process.exit(~~console.info(info));

if (process.argv.length <= 2) die('No filename specified, exiting...', 1);
const inputFileName = process.argv.slice(-1)[0];
const outputFileName = inputFileName.replace(/\.md$/i, '.pdf');
if (!fs.existsSync(inputFileName)) die(`Input file "${inputFileName}" not found.`, 2);

showdown.setFlavor('github');
const inputText = fs.readFileSync(inputFileName, 'utf8');
const renderedMd = (new showdown.Converter()).makeHtml(inputText);
const outputHtml = `<!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8"><title></title><base href="http://127.0.0.1:${PORT}/" />
<style>${githubMarkdownCss}</style></head><body class="markdown-body">${renderedMd}</body></html>`;

let pup = { browser: null, page: null, server: null };
async function quitPup(code = 0, message = '') {
  if (message) console.info(message);
  await pup.browser.close();
  pup.server.close();
  process.exit(code);
}
async function handleExit() { await quitPup(0, 'SIGINT Closing Puppeteer and Serve.'); }
console.info(`Launching Serve at port ${PORT}`);
pup.server = http.createServer((request, response) => handler(request, response, { directoryListing: DEBUG }));
pup.server.listen(PORT, '127.0.0.1');
console.info('Launching Puppeteer');
(async () => {
  process.on('SIGINT', handleExit);
  const args = ['--disable-crash-reporter'];
  const headless = !DEBUG;
  const browser = pup.browser = await puppeteer.launch({ headless, printBackground: true, format: PDF_FORMAT, executablePath: BROWSER_PATH, args });
  const page = pup.page = await browser.newPage();
  await page.setContent(outputHtml);
  if (DEBUG) return;
  const m = `${MARGIN_CM}cm`;
  await page.pdf({ printBackground : true, path: outputFileName, margin: { top: m, right: m, bottom: m, left: m } });
  console.info('Closing Puppeteer');
  await browser.close();
  console.info('Closing Serve');
  pup.server.close();
})();
	// first: `npm init -- yes && npm i -S showdown@1.9.1 github-markdown-css@5.1.0 serve@13.0.2 puppeteer-core`
	// then: `node . --help`
	const fs = require('fs');
	const http = require('http');
	const puppeteer = require('puppeteer-core');
	const showdown = require('showdown');
	const githubMarkdownCss = fs.readFileSync(require.resolve('github-markdown-css'), 'utf8');
	const handler = require('serve-handler'); // without serve loading local files, like images, would not be possible

	const die = (text = '', code = 1) => process.exit(~~console.error(text) + code);
	const ifHasParam = (s = '') => process.argv.includes(s);
	const paramValueOf = (s = '') => (process.argv.find(x => x.startsWith(`${s}=`)) \|\| '').split('=')[1];
	const asNum = (s = '') => (s \|\| '').substr(0, 5).replace(/[^\d\.]/g, '');

	const VERSION = '1.2.0';
	const PDF_FORMAT = paramValueOf('--format') ?? 'A4';
	const MARGIN_CM = parseFloat(asNum(paramValueOf('--margin') ?? '1')) \|\| 0;
	const PORT = parseInt(asNum(paramValueOf('--port')), 10) \|\| 31234;
	const DEBUG = ifHasParam('--debug');
	let BROWSER_PATH = paramValueOf('--browser');
	if (!BROWSER_PATH && process.platform === 'linux') BROWSER_PATH = '/usr/bin/chromium';
	if (!BROWSER_PATH && process.platform === 'win32') BROWSER_PATH = 'C:/Program Files/Google/Chrome/Application/chrome.exe';
	if (!BROWSER_PATH && process.platform === 'darwin') BROWSER_PATH = '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome';

	let info = '';
	if (ifHasParam('--version')) info = `v${VERSION}`;
	if (ifHasParam('--help')) info = 'Params (all optional):\n--help\n--version\n--port=31234\n--margin=1' +
	'\n--debug\n--format=A4\n--browser=/usr/bin/chromium\n\nExample: node md2pdf sample.md';
	if (info) process.exit(~~console.info(info));

	if (process.argv.length <= 2) die('No filename specified, exiting...', 1);
	const inputFileName = process.argv.slice(-1)[0];
	const outputFileName = inputFileName.replace(/\.md$/i, '.pdf');
	if (!fs.existsSync(inputFileName)) die(`Input file "${inputFileName}" not found.`, 2);

	showdown.setFlavor('github');
	const inputText = fs.readFileSync(inputFileName, 'utf8');
	const renderedMd = (new showdown.Converter()).makeHtml(inputText);
	const outputHtml = `<!DOCTYPE html><html lang="en"><head>
	<meta charset="UTF-8"><title></title><base href="http://127.0.0.1:${PORT}/" />
	<style>${githubMarkdownCss}</style></head><body class="markdown-body">${renderedMd}</body></html>`;

	let pup = { browser: null, page: null, server: null };
	async function quitPup(code = 0, message = '') {
	if (message) console.info(message);
	await pup.browser.close();
	pup.server.close();
	process.exit(code);
	}
	async function handleExit() { await quitPup(0, 'SIGINT Closing Puppeteer and Serve.'); }
	console.info(`Launching Serve at port ${PORT}`);
	pup.server = http.createServer((request, response) => handler(request, response, { directoryListing: DEBUG }));
	pup.server.listen(PORT, '127.0.0.1');
	console.info('Launching Puppeteer');
	(async () => {
	process.on('SIGINT', handleExit);
	const args = ['--disable-crash-reporter'];
	const headless = !DEBUG;
	const browser = pup.browser = await puppeteer.launch({ headless, printBackground: true, format: PDF_FORMAT, executablePath: BROWSER_PATH, args });
	const page = pup.page = await browser.newPage();
	await page.setContent(outputHtml);
	if (DEBUG) return;
	const m = `${MARGIN_CM}cm`;
	await page.pdf({ printBackground : true, path: outputFileName, margin: { top: m, right: m, bottom: m, left: m } });
	console.info('Closing Puppeteer');
	await browser.close();
	console.info('Closing Serve');
	pup.server.close();
	})();