reverse-pdf.js

#!/usr/bin/env osascript -l JavaScript

ObjC.import('stdlib')
ObjC.import('PDFKit');

function reverse(opts) {
  // Load the PDF document
  const pdfURL = $.NSURL.fileURLWithPath(opts.src);
  const pdfDoc = $.PDFDocument.alloc.initWithURL(pdfURL);

  // Check if the PDF document was successfully loaded
  if (!pdfDoc.js) {
    console.log('Failed to load the PDF document.')
    $.exit(1);
  }

  // Create a new PDF document for the reversed pages
  const revDoc = $.PDFDocument.alloc.init;

  for (let i = 0; i < pdfDoc.pageCount; i++) {
    revDoc.insertPageAtIndex(pdfDoc.pageAtIndex(i), 0);
  }

  revDoc.writeToURL($.NSURL.fileURLWithPath(opts.dst));
}

function scriptName() {
  return $.NSProcessInfo.processInfo.arguments.objectAtIndex(3).js;
}

function run(args) {
  if (!args.length) {
    console.log(`Usage: ${scriptName()} -o dst.pdf src.pdf`);
    $.exit(1);
  }

  const opts = {};

  for (let i = 0; i < args.length; i++) {
    if (args[i] == '-o') {
      opts.dst = args[++i];
    } else {
      opts.src = args[i];
    }
  }

  reverse(opts);
}