Stirling-PDF/shared-operations/src/functions/removePages.ts

import { PdfFile } from '../wrappers/PdfFile.js';
import { getPages } from './common/getPagesByIndex.js';
import { invertSelection, parsePageIndexSpecification } from './common/pageIndexesUtils.js';

export type RemovePagesParamsType = {
    file: PdfFile;
    pageSelector: string;
}
export async function removePages(params: RemovePagesParamsType) {
    const { file, pageSelector } = params;
    const pdfDoc = await file.pdfLibDocument;
    const pageCount = pdfDoc.getPageCount();

    const pageSelection = parsePageIndexSpecification(pageSelector, pageCount);
    const pagesToKeep = invertSelection(pageSelection, pageCount);

    const newFile = await getPages(file, pagesToKeep);
    newFile.filename += "_removedPages"
    return newFile;
}