Nomad changes

docs/snippets/php/plugins/pdf_metadata_extractor.md

@@ -0,0 +1,64 @@
+```php title="PHP"
+<?php declare(strict_types=1);
+
+use Kreuzberg\Kreuzberg;
+
+class PdfMetadataExtractor implements PostProcessor {
+    public function name(): string {
+        return "pdf-metadata-extractor";
+    }
+
+    public function version(): string {
+        return "1.0.0";
+    }
+
+    public function initialize(): void {
+        // Load PDF parsing libraries if needed
+    }
+
+    public function shutdown(): void {
+        // Cleanup resources
+    }
+
+    public function process(object &$result, object $config): void {
+        // Only process PDFs
+        if ($result->mime_type !== 'application/pdf') {
+            return;
+        }
+
+        // Extract and attach metadata
+        if (!isset($result->metadata)) {
+            $result->metadata = [];
+        }
+
+        if (is_array($result->metadata)) {
+            $result->metadata = array_merge($result->metadata, [
+                'pdf_processor' => 'pdf-metadata-extractor',
+                'extracted_at' => date('Y-m-d H:i:s'),
+            ]);
+        }
+    }
+
+    public function processingStage(): string {
+        return "Middle";
+    }
+
+    public function shouldProcess(object $result, object $config): bool {
+        return $result->mime_type === 'application/pdf';
+    }
+
+    public function estimatedDurationMs(object $result): int {
+        return 10;
+    }
+
+    public function priority(): int {
+        return 60;
+    }
+}
+
+// Register the PDF metadata extractor
+$processor = new PdfMetadataExtractor();
+Kreuzberg::registerPostProcessor($processor);
+
+echo "PDF metadata extractor registered\n";
+```