Claude Desktop Commander MCP

import fs from 'fs/promises'; import { PDFDocument, PDFPage } from 'pdf-lib'; import { normalizePageIndexes } from './utils.js'; import { parseMarkdownToPdf } from './markdown.js'; import type { PdfInsertOperationSchema, PdfDeleteOperationSchema, PdfOperationSchema } from '../schemas.js'; import { z } from 'zod'; // Infer TypeScript types from Zod schemas for consistency type PdfInsertOperation = z.infer<typeof PdfInsertOperationSchema>; type PdfDeleteOperation = z.infer<typeof PdfDeleteOperationSchema>; type PdfOperations = z.infer<typeof PdfOperationSchema>; export type { PdfOperations, PdfInsertOperation, PdfDeleteOperation }; async function loadPdfDocumentFromBuffer(filePathOrBuffer: string | Buffer | Uint8Array): Promise<PDFDocument> { const buffer = typeof filePathOrBuffer === 'string' ? await fs.readFile(filePathOrBuffer) : filePathOrBuffer; const pdfBytes = new Uint8Array(buffer); return await PDFDocument.load(pdfBytes); } /** * Delete pages from a PDF document * @param pdfDoc PDF document to delete pages from * @param pageIndexes Page indices to delete, negative indices are from end */ function deletePages(pdfDoc: PDFDocument, pageIndexes: number[]): PDFDocument { const pageCount = pdfDoc.getPageCount(); // Transform negative indices to absolute and filter valid ones const normalizedIndexes = normalizePageIndexes(pageIndexes, pageCount).sort((a, b) => b - a); for (const pageIndex of normalizedIndexes) { pdfDoc.removePage(pageIndex); } return pdfDoc; } function getPageLayout(page: PDFPage) { const { width, height } = page.getSize(); const mediaBox = page.getMediaBox(); // Full page area const cropBox = page.getCropBox(); // Visible area (may indicate margins) // Calculate margins (if CropBox differs from MediaBox) let marginLeft = cropBox.x - mediaBox.x; let marginBottom = cropBox.y - mediaBox.y; let marginRight = (mediaBox.x + mediaBox.width) - (cropBox.x + cropBox.width); let marginTop = (mediaBox.y + mediaBox.height) - (cropBox.y + cropBox.height); if (marginLeft === 0 && marginRight === 0 && marginTop === 0 && marginBottom === 0) { marginLeft = 72; marginBottom = 72; marginRight = 72; marginTop = 72; } // Convert points to inches (1 inch = 72 points) // Puppeteer requires standard units and doesn't accept decimal points const pointsToInches = (pts: number) => (pts / 72).toFixed(4); return { format: undefined, // Explicitly disable format to use custom dimensions width: `${pointsToInches(width)}in`, height: `${pointsToInches(height)}in`, margin: { top: `${pointsToInches(marginTop)}in`, right: `${pointsToInches(marginRight)}in`, bottom: `${pointsToInches(marginBottom)}in`, left: `${pointsToInches(marginLeft)}in` } }; } async function insertPages(destPdfDocument: PDFDocument, pageIndex: number, sourcePdfDocument: PDFDocument): Promise<PDFDocument> { let insertPosition = pageIndex < 0 ? destPdfDocument.getPageCount() + pageIndex : pageIndex; if (insertPosition < 0 || insertPosition > destPdfDocument.getPageCount()) { throw new Error('Invalid page index'); } const copiedPages = await destPdfDocument.copyPages(sourcePdfDocument, sourcePdfDocument.getPageIndices()); for (let i = 0; i < copiedPages.length; i++) { destPdfDocument.insertPage(insertPosition + i, copiedPages[i]); } return destPdfDocument; } /** * Edit an existing PDF by deleting or inserting pages * @param pdfPath Path to the PDF file to edit * @param operations List of operations to perform * @returns The modified PDF as a Uint8Array */ export async function editPdf( pdfPath: string, operations: PdfOperations[] ): Promise<Uint8Array> { const pdfDoc = await loadPdfDocumentFromBuffer(pdfPath); // Get page layout from the ORIGINAL first page const pageLayout = pdfDoc.getPageCount() > 0 ? getPageLayout(pdfDoc.getPage(0)) : undefined; for (const op of operations) { if (op.type === 'delete') { deletePages(pdfDoc, op.pageIndexes); } else if (op.type == 'insert') { let sourcePdfDocument: PDFDocument; if (op.markdown !== undefined) { const pdfOptions = pageLayout ? { pdf_options: pageLayout } : undefined; const pdfBuffer = await parseMarkdownToPdf(op.markdown, pdfOptions); sourcePdfDocument = await loadPdfDocumentFromBuffer(pdfBuffer); } else if (op.sourcePdfPath) { sourcePdfDocument = await loadPdfDocumentFromBuffer(op.sourcePdfPath); } else { throw new Error('No source provided for insert operation'); } await insertPages(pdfDoc, op.pageIndex, sourcePdfDocument); } } return await pdfDoc.save(); }