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Merge pull request #58 from divy-11/feature/reverse-multi-pdfs

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Feature/reverse multi pdfs
This commit is contained in:
Alam
2025-10-20 18:14:58 +05:30
committed by GitHub
parent 6971c18e5e 4e6cc77a28
commit ccb1b119c5
6 changed files with 144 additions and 21 deletions
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37
src/js/logic/reverse-pages.ts
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@@ -3,29 +3,38 @@ import { downloadFile } from '../utils/helpers.js';
import { state } from '../state.js';
import { PDFDocument as PDFLibDocument } from 'pdf-lib';
import JSZip from 'jszip';
export async function reversePages() {
if (!state.pdfDoc) {
const pdfDocs = state.files.filter((file: File) => file.type === 'application/pdf');
if (!pdfDocs.length) {
showAlert('Error', 'PDF not loaded.');
return;
}
showLoader('Reversing page order...');
try {
const newPdf = await PDFLibDocument.create();
const pageCount = state.pdfDoc.getPageCount();
const reversedIndices = Array.from(
{ length: pageCount },
(_, i) => pageCount - 1 - i
);
const zip = new JSZip();
for (let j = 0; j < pdfDocs.length; j++) {
const file = pdfDocs[j];
const arrayBuffer = await file.arrayBuffer();
const pdfDoc = await PDFLibDocument.load(arrayBuffer);
const newPdf = await PDFLibDocument.create();
const pageCount = pdfDoc.getPageCount();
const reversedIndices = Array.from(
{ length: pageCount },
(_, i) => pageCount - 1 - i
);
const copiedPages = await newPdf.copyPages(state.pdfDoc, reversedIndices);
copiedPages.forEach((page: any) => newPdf.addPage(page));
const copiedPages = await newPdf.copyPages(pdfDoc, reversedIndices);
copiedPages.forEach((page: any) => newPdf.addPage(page));
const newPdfBytes = await newPdf.save();
downloadFile(
new Blob([new Uint8Array(newPdfBytes)], { type: 'application/pdf' }),
'reversed.pdf'
);
const newPdfBytes = await newPdf.save();
const originalName = file.name.replace(/\.pdf$/i, '');
const fileName = `${originalName}_reversed.pdf`;
zip.file(fileName, newPdfBytes);
}
const zipBlob = await zip.generateAsync({ type: 'blob' });
downloadFile(zipBlob, 'reversed_pdfs.zip');
} catch (e) {
console.error(e);
showAlert('Error', 'Could not reverse the PDF pages.');