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https://github.com/alam00000/bentopdf.git
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Feature: Add duplex sort / collate tool
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r0ckarong committed
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@@ -539,6 +539,13 @@ const baseCategories = [
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subtitle:
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'Merge PDFs by alternating pages from each PDF. Preserves Bookmarks',
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},
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{
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href: import.meta.env.BASE_URL + 'duplex-collate.html',
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name: 'Duplex Collate',
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icon: 'ph-arrows-vertical',
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subtitle:
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'Reorder front/back scan blocks into collated page order in one PDF.',
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},
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{
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href: import.meta.env.BASE_URL + 'organize-pdf.html',
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name: 'Organize & Duplicate',
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@@ -0,0 +1,462 @@
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import { createIcons, icons } from 'lucide';
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import { showAlert, showLoader, hideLoader } from '../ui.js';
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import { formatBytes, downloadFile } from '../utils/helpers.js';
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import { loadPdfWithPasswordPrompt } from '../utils/password-prompt.js';
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import { loadPdfDocument } from '../utils/load-pdf-document.js';
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import { PDFDocument } from 'pdf-lib';
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import JSZip from 'jszip';
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interface DuplexState {
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file: File | null;
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pdfDoc: PDFDocument | null;
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totalPages: number;
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}
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const duplexState: DuplexState = {
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file: null,
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pdfDoc: null,
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totalPages: 0,
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};
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if (document.readyState === 'loading') {
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document.addEventListener('DOMContentLoaded', initializePage);
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} else {
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initializePage();
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}
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function initializePage() {
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createIcons({ icons });
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const fileInput = document.getElementById('file-input') as HTMLInputElement;
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const dropZone = document.getElementById('drop-zone');
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const processBtn = document.getElementById('process-btn');
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const autoSplitBtn = document.getElementById('auto-split-btn');
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if (fileInput) {
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fileInput.addEventListener('change', handleFileUpload);
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fileInput.addEventListener('click', () => {
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fileInput.value = '';
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});
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}
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if (dropZone) {
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dropZone.addEventListener('dragover', (e) => {
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e.preventDefault();
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dropZone.classList.add('bg-gray-700');
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});
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dropZone.addEventListener('dragleave', () => {
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dropZone.classList.remove('bg-gray-700');
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});
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dropZone.addEventListener('drop', (e) => {
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e.preventDefault();
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dropZone.classList.remove('bg-gray-700');
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const droppedFiles = e.dataTransfer?.files;
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if (droppedFiles && droppedFiles.length > 0) {
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handleFile(droppedFiles[0]);
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}
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});
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}
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processBtn?.addEventListener('click', processDuplexCollate);
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autoSplitBtn?.addEventListener('click', () => {
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const splitInput = document.getElementById(
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'split-page'
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) as HTMLInputElement | null;
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if (!splitInput || duplexState.totalPages < 2) return;
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splitInput.value = Math.ceil(duplexState.totalPages / 2).toString();
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updatePreviewSummary();
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});
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document
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.getElementById('split-page')
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?.addEventListener('input', updatePreviewSummary);
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document
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.getElementById('back-order')
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?.addEventListener('change', updatePreviewSummary);
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document
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.getElementById('export-grouped')
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?.addEventListener('change', toggleGroupedOptions);
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document.getElementById('back-to-tools')?.addEventListener('click', () => {
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window.location.href = import.meta.env.BASE_URL;
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});
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}
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function handleFileUpload(e: Event) {
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const input = e.target as HTMLInputElement;
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if (input.files && input.files.length > 0) {
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handleFile(input.files[0]);
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}
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}
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async function handleFile(file: File) {
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if (
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file.type !== 'application/pdf' &&
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!file.name.toLowerCase().endsWith('.pdf')
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) {
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showAlert('Invalid File', 'Please select a PDF file.');
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return;
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}
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showLoader('Loading PDF...');
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try {
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const result = await loadPdfWithPasswordPrompt(file);
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if (!result) {
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hideLoader();
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return;
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}
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result.pdf.destroy();
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duplexState.file = result.file;
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duplexState.pdfDoc = await loadPdfDocument(result.bytes);
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duplexState.totalPages = duplexState.pdfDoc.getPageCount();
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updateFileDisplay();
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showOptions();
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showOddPageWarning();
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applyDefaultSplitPoint();
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updatePreviewSummary();
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hideLoader();
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} catch (error) {
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console.error('Error loading PDF:', error);
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hideLoader();
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showAlert('Error', 'Failed to load PDF file.');
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}
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}
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function stripPdfExtension(name: string): string {
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return name.replace(/\.pdf$/i, '');
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}
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function getBaseFilename(): string {
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return stripPdfExtension(duplexState.file?.name || 'document');
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}
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function updateFileDisplay() {
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const fileDisplayArea = document.getElementById('file-display-area');
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if (!fileDisplayArea || !duplexState.file) return;
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fileDisplayArea.innerHTML = '';
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const fileDiv = document.createElement('div');
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fileDiv.className =
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'flex items-center justify-between bg-gray-700 p-3 rounded-lg';
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const infoContainer = document.createElement('div');
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infoContainer.className = 'flex flex-col flex-1 min-w-0';
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const nameSpan = document.createElement('div');
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nameSpan.className = 'truncate font-medium text-gray-200 text-sm mb-1';
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nameSpan.textContent = duplexState.file.name;
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const metaSpan = document.createElement('div');
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metaSpan.className = 'text-xs text-gray-400';
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metaSpan.textContent = `${formatBytes(duplexState.file.size)} • ${duplexState.totalPages} pages`;
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infoContainer.append(nameSpan, metaSpan);
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const removeBtn = document.createElement('button');
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removeBtn.className = 'ml-4 text-red-400 hover:text-red-300 flex-shrink-0';
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removeBtn.innerHTML = '<i data-lucide="trash-2" class="w-4 h-4"></i>';
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removeBtn.onclick = resetState;
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fileDiv.append(infoContainer, removeBtn);
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fileDisplayArea.appendChild(fileDiv);
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createIcons({ icons });
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}
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function showOptions() {
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const options = document.getElementById('duplex-options');
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const totalPagesEl = document.getElementById('total-pages');
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options?.classList.remove('hidden');
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if (totalPagesEl) {
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totalPagesEl.textContent = duplexState.totalPages.toString();
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}
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}
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function showOddPageWarning() {
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const banner = document.getElementById('odd-page-banner');
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if (!banner) return;
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if (duplexState.totalPages % 2 !== 0) {
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banner.classList.remove('hidden');
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banner.textContent = `⚠ Odd page count (${duplexState.totalPages}). A duplex scan should have an even number of pages — you may have a missing or extra page.`;
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} else {
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banner.classList.add('hidden');
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banner.textContent = '';
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}
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}
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function applyDefaultSplitPoint() {
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const splitInput = document.getElementById(
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'split-page'
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) as HTMLInputElement | null;
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if (!splitInput) return;
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splitInput.value = Math.ceil(duplexState.totalPages / 2).toString();
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}
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function toggleGroupedOptions() {
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const grouped = document.getElementById(
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'export-grouped'
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) as HTMLInputElement | null;
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const groupPanel = document.getElementById('grouped-options');
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if (!grouped || !groupPanel) return;
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if (grouped.checked) {
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groupPanel.classList.remove('hidden');
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} else {
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groupPanel.classList.add('hidden');
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}
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}
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function getSplitPoint(): number {
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const splitInput = document.getElementById(
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'split-page'
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) as HTMLInputElement | null;
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const fallback = Math.ceil(duplexState.totalPages / 2);
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if (!splitInput) return fallback;
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const parsed = Number.parseInt(splitInput.value, 10);
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if (!Number.isFinite(parsed)) return fallback;
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return Math.max(1, Math.min(parsed, Math.max(duplexState.totalPages - 1, 1)));
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}
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function getBackOrder(): 'reverse' | 'keep' {
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const backOrder = document.getElementById(
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'back-order'
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) as HTMLSelectElement | null;
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return backOrder?.value === 'keep' ? 'keep' : 'reverse';
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}
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function buildDuplexOrder(
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totalPages: number,
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splitPoint: number,
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backOrder: 'reverse' | 'keep'
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) {
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const fronts = Array.from({ length: splitPoint }, (_, i) => i);
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const backs = Array.from(
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{ length: totalPages - splitPoint },
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(_, i) => splitPoint + i
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);
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if (backOrder === 'reverse') {
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backs.reverse();
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}
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const order: number[] = [];
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const pairCount = Math.max(fronts.length, backs.length);
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for (let i = 0; i < pairCount; i++) {
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if (fronts[i] !== undefined) order.push(fronts[i]);
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if (backs[i] !== undefined) order.push(backs[i]);
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}
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return {
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order,
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frontCount: fronts.length,
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backCount: backs.length,
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};
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}
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function updatePreviewSummary() {
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const summary = document.getElementById('duplex-preview-summary');
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const warning = document.getElementById('duplex-warning');
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if (!summary || !warning || duplexState.totalPages === 0) return;
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const splitPoint = getSplitPoint();
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const backOrder = getBackOrder();
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const { order, frontCount, backCount } = buildDuplexOrder(
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duplexState.totalPages,
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splitPoint,
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backOrder
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);
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summary.textContent =
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`Front block: ${frontCount} page(s), back block: ${backCount} page(s). ` +
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`Output: ${order.length} page(s), in front/back sequence.`;
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if (frontCount !== backCount) {
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warning.classList.remove('hidden');
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warning.textContent =
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`Front and back block lengths differ (${frontCount} front vs ${backCount} back). ` +
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`The ${Math.abs(frontCount - backCount)} extra page(s) on the longer side will be appended unpaired at the end.`;
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} else {
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warning.classList.add('hidden');
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warning.textContent = '';
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}
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}
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async function createPdfFromIndices(
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sourceDoc: PDFDocument,
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indices: number[]
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): Promise<Uint8Array> {
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const outDoc = await PDFDocument.create();
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const copiedPages = await outDoc.copyPages(sourceDoc, indices);
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copiedPages.forEach((page) => outDoc.addPage(page));
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return new Uint8Array(await outDoc.save());
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}
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function bytesToArrayBuffer(bytes: Uint8Array): ArrayBuffer {
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const { buffer, byteOffset, byteLength } = bytes;
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if (buffer instanceof ArrayBuffer) {
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return buffer.slice(byteOffset, byteOffset + byteLength);
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}
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const copy = new Uint8Array(byteLength);
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copy.set(bytes);
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return copy.buffer;
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}
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async function processDuplexCollate() {
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if (!duplexState.file || !duplexState.pdfDoc || duplexState.totalPages < 2) {
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showAlert(
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'Missing File',
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'Please upload a PDF with at least 2 pages before processing.'
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);
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return;
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}
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const splitPoint = getSplitPoint();
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if (splitPoint <= 0 || splitPoint >= duplexState.totalPages) {
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showAlert(
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'Invalid Split Point',
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`Split point must be between page 1 and page ${duplexState.totalPages - 1}.`
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);
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return;
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}
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const backOrder = getBackOrder();
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// Warn explicitly if the blocks will be unequal (likely a scan error)
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const { frontCount, backCount } = buildDuplexOrder(
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duplexState.totalPages,
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splitPoint,
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backOrder
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);
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if (frontCount !== backCount) {
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const proceed = window.confirm(
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`The front block has ${frontCount} page(s) and the back block has ${backCount} page(s).\n` +
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`This usually means a page was scanned twice or is missing.\n\n` +
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`The ${Math.abs(frontCount - backCount)} unpaired page(s) will be appended at the end.\n\n` +
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`Continue anyway?`
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);
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if (!proceed) return;
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}
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const groupedCheckbox = document.getElementById(
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'export-grouped'
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) as HTMLInputElement | null;
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const pagesPerDocInput = document.getElementById(
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'pages-per-document'
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) as HTMLInputElement | null;
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const exportGrouped = groupedCheckbox?.checked === true;
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const pagesPerDocument = Number.parseInt(pagesPerDocInput?.value || '0', 10);
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if (
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exportGrouped &&
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(!Number.isFinite(pagesPerDocument) || pagesPerDocument < 1)
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) {
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showAlert(
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'Invalid Group Size',
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'Please enter a valid number of pages per original document.'
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);
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return;
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}
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showLoader('Collating duplex scan...');
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try {
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const { order } = buildDuplexOrder(
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duplexState.totalPages,
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splitPoint,
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backOrder
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);
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const baseName = getBaseFilename();
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if (!exportGrouped) {
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const bytes = await createPdfFromIndices(duplexState.pdfDoc, order);
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const blob = new Blob([bytesToArrayBuffer(bytes)], {
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type: 'application/pdf',
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});
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downloadFile(blob, `${baseName}_collated.pdf`);
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hideLoader();
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showAlert('Success', 'Collated PDF generated successfully.', 'success');
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return;
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}
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const zip = new JSZip();
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let fileCount = 0;
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for (let start = 0; start < order.length; start += pagesPerDocument) {
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const chunk = order.slice(start, start + pagesPerDocument);
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if (chunk.length === 0) continue;
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const chunkBytes = await createPdfFromIndices(duplexState.pdfDoc, chunk);
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fileCount += 1;
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zip.file(`${baseName}_doc_${fileCount}.pdf`, chunkBytes);
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}
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if (fileCount === 1) {
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const firstChunk = order.slice(0, pagesPerDocument);
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const bytes = await createPdfFromIndices(duplexState.pdfDoc, firstChunk);
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const blob = new Blob([bytesToArrayBuffer(bytes)], {
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type: 'application/pdf',
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});
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downloadFile(blob, `${baseName}_doc_1.pdf`);
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} else {
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const zipBlob = await zip.generateAsync({ type: 'blob' });
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downloadFile(zipBlob, `${baseName}_collated_grouped.zip`);
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}
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hideLoader();
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showAlert(
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'Success',
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`Collation complete. Generated ${fileCount} grouped file(s).`,
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'success'
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);
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} catch (error) {
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console.error('Duplex collate error:', error);
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hideLoader();
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showAlert('Error', 'Failed to collate PDF.');
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}
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}
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function resetState() {
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duplexState.file = null;
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duplexState.pdfDoc = null;
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duplexState.totalPages = 0;
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const options = document.getElementById('duplex-options');
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const fileDisplayArea = document.getElementById('file-display-area');
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const oddBanner = document.getElementById('odd-page-banner');
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if (oddBanner) {
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oddBanner.classList.add('hidden');
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oddBanner.textContent = '';
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}
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const splitInput = document.getElementById(
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'split-page'
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) as HTMLInputElement | null;
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const groupedCheckbox = document.getElementById(
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'export-grouped'
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) as HTMLInputElement | null;
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const pagesPerDocInput = document.getElementById(
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'pages-per-document'
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) as HTMLInputElement | null;
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const warning = document.getElementById('duplex-warning');
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const summary = document.getElementById('duplex-preview-summary');
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options?.classList.add('hidden');
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if (fileDisplayArea) fileDisplayArea.innerHTML = '';
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if (splitInput) splitInput.value = '';
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if (groupedCheckbox) groupedCheckbox.checked = false;
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if (pagesPerDocInput) pagesPerDocInput.value = '2';
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if (warning) {
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warning.classList.add('hidden');
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warning.textContent = '';
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}
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if (summary) summary.textContent = '';
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toggleGroupedOptions();
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}
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@@ -211,6 +211,7 @@ const init = async () => {
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'PDF to JSON': 'tools:pdfToJson',
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'OCR PDF': 'tools:ocrPdf',
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'Alternate & Mix Pages': 'tools:alternateMerge',
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'Duplex Collate': 'tools:duplexCollate',
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'PDF Overlay': 'tools:pdfOverlay',
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'Organize & Duplicate': 'tools:duplicateOrganize',
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'Add Attachments': 'tools:addAttachments',
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