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feat:Setup Prettier for code formatting
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@@ -8,147 +8,167 @@ import { PDFPageProxy } from 'pdfjs-dist/types/src/display/api.js';
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let analysisCache = [];
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async function isPageBlank(page: PDFPageProxy, threshold: number) {
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const canvas = document.createElement('canvas');
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const context = canvas.getContext('2d');
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const viewport = page.getViewport({ scale: 0.2 });
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canvas.width = viewport.width;
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canvas.height = viewport.height;
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const canvas = document.createElement('canvas');
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const context = canvas.getContext('2d');
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await page.render({ canvasContext: context, viewport, canvas: canvas }).promise;
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const viewport = page.getViewport({ scale: 0.2 });
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canvas.width = viewport.width;
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canvas.height = viewport.height;
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const imageData = context.getImageData(0, 0, canvas.width, canvas.height);
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const data = imageData.data;
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const totalPixels = data.length / 4;
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let nonWhitePixels = 0;
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await page.render({ canvasContext: context, viewport, canvas: canvas })
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.promise;
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for (let i = 0; i < data.length; i += 4) {
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if (data[i] < 245 || data[i+1] < 245 || data[i+2] < 245) {
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nonWhitePixels++;
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}
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const imageData = context.getImageData(0, 0, canvas.width, canvas.height);
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const data = imageData.data;
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const totalPixels = data.length / 4;
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let nonWhitePixels = 0;
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for (let i = 0; i < data.length; i += 4) {
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if (data[i] < 245 || data[i + 1] < 245 || data[i + 2] < 245) {
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nonWhitePixels++;
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}
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}
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const blankness = 1 - (nonWhitePixels / totalPixels);
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return blankness >= (threshold / 100);
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const blankness = 1 - nonWhitePixels / totalPixels;
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return blankness >= threshold / 100;
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}
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async function analyzePages() {
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if (!state.pdfDoc) return;
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showLoader('Analyzing for blank pages...');
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if (!state.pdfDoc) return;
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showLoader('Analyzing for blank pages...');
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const pdfBytes = await state.pdfDoc.save();
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const pdf = await pdfjsLib.getDocument({ data: pdfBytes }).promise;
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analysisCache = [];
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const promises = [];
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const pdfBytes = await state.pdfDoc.save();
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const pdf = await pdfjsLib.getDocument({ data: pdfBytes }).promise;
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for (let i = 1; i <= pdf.numPages; i++) {
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promises.push(
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pdf.getPage(i).then(page =>
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isPageBlank(page, 0).then(isActuallyBlank => ({
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pageNum: i,
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isInitiallyBlank: isActuallyBlank,
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pageRef: page,
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}))
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)
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);
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}
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analysisCache = await Promise.all(promises);
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hideLoader();
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updateAnalysisUI();
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analysisCache = [];
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const promises = [];
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for (let i = 1; i <= pdf.numPages; i++) {
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promises.push(
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pdf.getPage(i).then((page) =>
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isPageBlank(page, 0).then((isActuallyBlank) => ({
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pageNum: i,
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isInitiallyBlank: isActuallyBlank,
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pageRef: page,
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}))
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)
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);
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}
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analysisCache = await Promise.all(promises);
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hideLoader();
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updateAnalysisUI();
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}
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async function updateAnalysisUI() {
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const sensitivity = parseInt((document.getElementById('sensitivity-slider') as HTMLInputElement).value);
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(document.getElementById('sensitivity-value') as HTMLSpanElement).textContent = sensitivity.toString();
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const sensitivity = parseInt(
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(document.getElementById('sensitivity-slider') as HTMLInputElement).value
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);
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(
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document.getElementById('sensitivity-value') as HTMLSpanElement
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).textContent = sensitivity.toString();
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const previewContainer = document.getElementById('analysis-preview');
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const analysisText = document.getElementById('analysis-text');
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const thumbnailsContainer = document.getElementById('removed-pages-thumbnails');
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thumbnailsContainer.innerHTML = '';
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const pagesToRemove = [];
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for (const pageData of analysisCache) {
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const isConsideredBlank = await isPageBlank(pageData.pageRef, sensitivity);
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if (isConsideredBlank) {
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pagesToRemove.push(pageData.pageNum);
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}
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const previewContainer = document.getElementById('analysis-preview');
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const analysisText = document.getElementById('analysis-text');
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const thumbnailsContainer = document.getElementById(
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'removed-pages-thumbnails'
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);
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thumbnailsContainer.innerHTML = '';
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const pagesToRemove = [];
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for (const pageData of analysisCache) {
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const isConsideredBlank = await isPageBlank(pageData.pageRef, sensitivity);
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if (isConsideredBlank) {
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pagesToRemove.push(pageData.pageNum);
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}
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if (pagesToRemove.length > 0) {
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analysisText.textContent = `Found ${pagesToRemove.length} blank page(s) to remove: ${pagesToRemove.join(', ')}`;
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previewContainer.classList.remove('hidden');
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}
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for (const pageNum of pagesToRemove) {
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const pageData = analysisCache[pageNum-1];
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const viewport = pageData.pageRef.getViewport({ scale: 0.1 });
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const thumbCanvas = document.createElement('canvas');
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thumbCanvas.width = viewport.width;
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thumbCanvas.height = viewport.height;
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await pageData.pageRef.render({ canvasContext: thumbCanvas.getContext('2d'), viewport }).promise;
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if (pagesToRemove.length > 0) {
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analysisText.textContent = `Found ${pagesToRemove.length} blank page(s) to remove: ${pagesToRemove.join(', ')}`;
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previewContainer.classList.remove('hidden');
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const img = document.createElement('img');
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img.src = thumbCanvas.toDataURL();
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img.className = 'rounded border border-gray-600';
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img.title = `Page ${pageNum}`;
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thumbnailsContainer.appendChild(img);
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}
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for (const pageNum of pagesToRemove) {
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const pageData = analysisCache[pageNum - 1];
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const viewport = pageData.pageRef.getViewport({ scale: 0.1 });
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const thumbCanvas = document.createElement('canvas');
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thumbCanvas.width = viewport.width;
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thumbCanvas.height = viewport.height;
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await pageData.pageRef.render({
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canvasContext: thumbCanvas.getContext('2d'),
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viewport,
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}).promise;
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} else {
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analysisText.textContent = 'No blank pages found at this sensitivity level.';
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previewContainer.classList.remove('hidden');
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const img = document.createElement('img');
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img.src = thumbCanvas.toDataURL();
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img.className = 'rounded border border-gray-600';
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img.title = `Page ${pageNum}`;
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thumbnailsContainer.appendChild(img);
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}
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} else {
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analysisText.textContent =
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'No blank pages found at this sensitivity level.';
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previewContainer.classList.remove('hidden');
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}
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}
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export async function setupRemoveBlankPagesTool() {
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await analyzePages();
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document.getElementById('sensitivity-slider').addEventListener('input', updateAnalysisUI);
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await analyzePages();
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document
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.getElementById('sensitivity-slider')
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.addEventListener('input', updateAnalysisUI);
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}
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export async function removeBlankPages() {
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showLoader('Removing blank pages...');
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try {
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const sensitivity = parseInt((document.getElementById('sensitivity-slider') as HTMLInputElement).value);
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const indicesToKeep = [];
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showLoader('Removing blank pages...');
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try {
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const sensitivity = parseInt(
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(document.getElementById('sensitivity-slider') as HTMLInputElement).value
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);
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const indicesToKeep = [];
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for (const pageData of analysisCache) {
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const isConsideredBlank = await isPageBlank(pageData.pageRef, sensitivity);
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if (!isConsideredBlank) {
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indicesToKeep.push(pageData.pageNum - 1);
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}
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}
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if (indicesToKeep.length === 0) {
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hideLoader();
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showAlert(
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'No Content Found',
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'All pages were identified as blank at the current sensitivity setting. No new file was created. Try lowering the sensitivity if you believe this is an error.'
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);
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return;
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}
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if (indicesToKeep.length === state.pdfDoc.getPageCount()) {
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hideLoader();
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showAlert('No Pages Removed', 'No pages were identified as blank at the current sensitivity level.');
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return;
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}
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const newPdf = await PDFDocument.create();
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const copiedPages = await newPdf.copyPages(state.pdfDoc, indicesToKeep);
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copiedPages.forEach(page => newPdf.addPage(page));
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const newPdfBytes = await newPdf.save();
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downloadFile(new Blob([new Uint8Array(newPdfBytes)], { type: 'application/pdf' }), 'non-blank.pdf');
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} catch (e) {
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console.error(e);
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showAlert('Error', 'Could not remove blank pages.');
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} finally {
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hideLoader();
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for (const pageData of analysisCache) {
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const isConsideredBlank = await isPageBlank(
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pageData.pageRef,
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sensitivity
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);
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if (!isConsideredBlank) {
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indicesToKeep.push(pageData.pageNum - 1);
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}
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}
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}
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if (indicesToKeep.length === 0) {
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hideLoader();
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showAlert(
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'No Content Found',
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'All pages were identified as blank at the current sensitivity setting. No new file was created. Try lowering the sensitivity if you believe this is an error.'
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);
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return;
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}
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if (indicesToKeep.length === state.pdfDoc.getPageCount()) {
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hideLoader();
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showAlert(
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'No Pages Removed',
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'No pages were identified as blank at the current sensitivity level.'
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);
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return;
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}
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const newPdf = await PDFDocument.create();
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const copiedPages = await newPdf.copyPages(state.pdfDoc, indicesToKeep);
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copiedPages.forEach((page) => newPdf.addPage(page));
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const newPdfBytes = await newPdf.save();
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downloadFile(
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new Blob([new Uint8Array(newPdfBytes)], { type: 'application/pdf' }),
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'non-blank.pdf'
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);
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} catch (e) {
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console.error(e);
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showAlert('Error', 'Could not remove blank pages.');
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} finally {
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hideLoader();
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}
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}
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