add README and comments

README.md

@@ -0,0 +1,13 @@
+# docs2pdf
+===
+simple tool to create pdfs from online documents (hedgedoc)
+
+## install
+```
+npm i
+```
+
+## run script
+```
+node index.js "https://foo.bar"
+```

index.js

@@ -3,6 +3,7 @@ import fs from 'fs';
 import moment from 'moment';
 import PDFMerger from 'pdf-merger-js';
 
+// get params from console
 let [
   url,
   title = '',
@@ -14,8 +15,10 @@ const path = './pdf';
 
 if (!fs.existsSync(path)) fs.mkdirSync(path);
 
+
 let browser;
 try{
+  // start puppeteer
   browser = await puppeteer.launch({
     headless: true,
     args: [
@@ -26,18 +29,23 @@ try{
     ]
   });
 
+  // open page
   const page = await browser.newPage();
   page.setDefaultNavigationTimeout(0);
   await page.goto(url);
   await Promise.any([
     page.mainFrame().waitForNavigation({waitUntil: 'networkidle0'}),
-    new Promise(resolve => setTimeout(resolve,1000))
+    new Promise(resolve => setTimeout(resolve,2000))
   ]);
 
+  // search for header and subheader in document
   if (!title) title = await (await page.waitForSelector('h1')).evaluate(el => el.textContent);
   if (!subtitle) subtitle = await (await page.waitForSelector('h2')).evaluate(el => el.textContent);
   console.log(title,subtitle);
 
+  const filename = `${date}_${title.trim().replaceAll(' ', '_')}`;
+
+  // deactivate @print css and add custom css (for pretty code)
   await page.emulateMediaType('screen');
   await page.addStyleTag({content: `
     .hidden-print {
@@ -48,8 +56,9 @@ try{
     }
   `});
 
+  // create pdf for pages
   const pages = await page.pdf({
-    //path: `${path}/${date}_${title}_pages.pdf`,
+    //path: `${path}/${filename}_pages.pdf`,
     format: 'A4',
     margin: {
       top: '20mm',
@@ -82,6 +91,7 @@ try{
     printBackground: true
   });
 
+  // load cover template and replace values
   let coverHTML = fs.readFileSync('./cover.html', {encoding: 'utf-8', flag: 'r'});
 
   Object.entries({
@@ -90,11 +100,13 @@ try{
     coverHTML = coverHTML.replaceAll(`{{${key}}}`, value);
   });
 
+  // open new page and set template
   const page2 = await browser.newPage();
   await page2.setContent(coverHTML);
 
+  // create pdf for cover
   const cover = await page2.pdf({
-    //path: `${path}/${date}_${title}_cover.pdf`,
+    //path: `${path}/${filename}_cover.pdf`,
     format: 'A4',
     margin: {
       top: '20mm',
@@ -104,16 +116,20 @@ try{
     }
   });
 
+  // close puppeteer
   await browser.close();
 
+  // merge both pdfs and save
   const merger = new PDFMerger();
   merger.add(cover);
   merger.add(pages);
-  await merger.save(`${path}/${date}_${title.trim().replaceAll(' ', '_')}.pdf`)
+  await merger.save(`${path}/${filename}.pdf`)
-
-} catch (e) {
-  if (browser) await browser.close();
-  throw e;
-}
 
   console.log('finished');
+  console.log(`saved at ${path}/${filename}.pdf`);
+
+} catch (e) {
+  // try to close browser on exception
+  if (browser) await browser.close();
+  console.error(e);
+}