Nomad changes

docs/snippets/rust/plugins/pdf_metadata_extractor.md

@@ -0,0 +1,69 @@
+```rust title="Rust"
+use kreuzberg::plugins::{Plugin, PostProcessor, ProcessingStage, register_post_processor};
+use kreuzberg::{Result, ExtractionResult, ExtractionConfig};
+use async_trait::async_trait;
+use std::sync::Arc;
+use std::sync::atomic::{AtomicUsize, Ordering};
+use serde_json::json;
+
+struct PdfMetadataExtractor {
+    processed_count: AtomicUsize,
+}
+
+impl Plugin for PdfMetadataExtractor {
+    fn name(&self) -> &str { "pdf-metadata-extractor" }
+    fn version(&self) -> String { "1.0.0".to_string() }
+    fn initialize(&self) -> Result<()> {
+        self.processed_count.store(0, Ordering::Release);
+        Ok(())
+    }
+    fn shutdown(&self) -> Result<()> { Ok(()) }
+}
+
+#[async_trait]
+impl PostProcessor for PdfMetadataExtractor {
+    async fn process(
+        &self,
+        result: &mut ExtractionResult,
+        _config: &ExtractionConfig,
+    ) -> Result<()> {
+        if result.mime_type != "application/pdf" {
+            return Ok(());
+        }
+
+        let order = self.processed_count.fetch_add(1, Ordering::AcqRel) + 1;
+
+        result.metadata.additional.insert("pdf_processed".to_string(), json!(true));
+        result.metadata.additional.insert("pdf_order".to_string(), json!(order));
+        result.metadata.additional.insert(
+            "content_length".to_string(),
+            json!(result.content.len()),
+        );
+        result.metadata.additional.insert(
+            "pdf_processor_version".to_string(),
+            json!("1.0.0"),
+        );
+
+        Ok(())
+    }
+
+    fn processing_stage(&self) -> ProcessingStage {
+        ProcessingStage::Early
+    }
+
+    fn should_process(
+        &self,
+        result: &ExtractionResult,
+        _config: &ExtractionConfig,
+    ) -> bool {
+        result.mime_type == "application/pdf"
+    }
+}
+
+fn main() -> Result<()> {
+    register_post_processor(Arc::new(PdfMetadataExtractor {
+        processed_count: AtomicUsize::new(0),
+    }))?;
+    Ok(())
+}
+```