Convert images in a folder to PDF

toPdf.js

/*
  toPdf.js

  Gather all JPG, JPEG and PNG images in a folder and convert them to
  individual files in an output folder named after the source folder name

  $ node toPdf.js [source/folder/path]

  The script will, within the current directory, create a folder with the
  same name as the input folder and add all generated PDF files to it.
*/
const path = require('path');
const fs = require('fs');
const PDFDocument = require('pdfkit');

if (process.argv.length < 3) {
  console.error('[ERROR] Expected the path of invoices source folder as argument.');
  process.exit(1);
}

const sourceFolderPath = process.argv[2];
const outputFolderName = sourceFolderPath.split('/').pop();
const outputFolderPath = path.join(__dirname, outputFolderName);

!fs.existsSync(outputFolderPath) && fs.mkdirSync(outputFolderPath);
fs.readdir(sourceFolderPath, function (err, files) {
  if (err) {
    console.error(`[ERROR] Unable to scan directory: ${err}`);
    process.exit(1);
  }

  files.forEach(function (file) {
    if (!(file.match(/\.(jpg|jpeg|png)$/i) || []).length) {
      return console.info(`[INFO] File ${file} not converted due to unsupported type`);
    }

    const doc = new PDFDocument({
      margin: 20,
      size: [500, 800]
    });

    const outputFileName = file.replace(/\.(jpg|jpeg|png)$/i, '');
    doc.pipe(fs.createWriteStream(`${outputFolderName}/${outputFileName}.pdf`));

    doc.image(`${sourceFolderPath}/${file}`, {
      fit: [460, 760],
      align: 'left',
      valign: 'top',
      dpi: 200
    });

    doc.end();
    console.info(`[INFO] Successfuly converted ${sourceFolderPath}/${file} to ${outputFolderPath}/${outputFileName}.pdf`);
  });
});