Add visual workflow builder, fix critical bugs, and add Arabic i18n support

src/js/workflow/nodes/pdf-to-markdown-node.ts

@@ -0,0 +1,50 @@
+import { ClassicPreset } from 'rete';
+import { BaseWorkflowNode } from './base-node';
+import { pdfSocket } from '../sockets';
+import type { SocketData } from '../types';
+import { requirePdfInput, extractAllPdfs } from '../types';
+import { downloadFile } from '../../utils/helpers.js';
+import { loadPyMuPDF } from '../../utils/pymupdf-loader.js';
+
+export class PdfToMarkdownNode extends BaseWorkflowNode {
+  readonly category = 'Output' as const;
+  readonly icon = 'ph-markdown-logo';
+  readonly description = 'Extract text from PDF as Markdown';
+
+  constructor() {
+    super('PDF to Markdown');
+    this.addInput('pdf', new ClassicPreset.Input(pdfSocket, 'PDF'));
+  }
+
+  private async extractMarkdown(bytes: Uint8Array): Promise<string> {
+    const pymupdf = await loadPyMuPDF();
+    const blob = new Blob([new Uint8Array(bytes)], { type: 'application/pdf' });
+    return pymupdf.pdfToMarkdown(blob, { includeImages: false });
+  }
+
+  async data(
+    inputs: Record<string, SocketData[]>
+  ): Promise<Record<string, SocketData>> {
+    const pdfInputs = requirePdfInput(inputs, 'PDF to Markdown');
+    const allPdfs = extractAllPdfs(pdfInputs);
+
+    if (allPdfs.length === 1) {
+      const markdown = await this.extractMarkdown(allPdfs[0].bytes);
+      const blob = new Blob([markdown], { type: 'text/markdown' });
+      const name = allPdfs[0].filename.replace(/\.pdf$/i, '') + '.md';
+      downloadFile(blob, name);
+    } else {
+      const JSZip = (await import('jszip')).default;
+      const zip = new JSZip();
+      for (const pdf of allPdfs) {
+        const markdown = await this.extractMarkdown(pdf.bytes);
+        const name = pdf.filename.replace(/\.pdf$/i, '') + '.md';
+        zip.file(name, markdown);
+      }
+      const zipBlob = await zip.generateAsync({ type: 'blob' });
+      downloadFile(zipBlob, 'markdown_files.zip');
+    }
+
+    return {};
+  }
+}