Nomad changes

docs/snippets/rust/plugins/plugin_validator.md

@@ -0,0 +1,61 @@
+```rust title="Rust"
+use kreuzberg::plugins::{Plugin, Validator, register_validator};
+use kreuzberg::{Result, ExtractionResult, ExtractionConfig, KreuzbergError};
+use async_trait::async_trait;
+use std::sync::Arc;
+
+// Generic validator pattern: every Validator has the same shape.
+// `name()` keys the registry, `priority()` orders execution (higher = earlier),
+// and `validate()` returns Err on failure.
+struct GenericValidator<F>
+where
+    F: Fn(&ExtractionResult, &ExtractionConfig) -> Result<()> + Send + Sync + 'static,
+{
+    plugin_name: String,
+    plugin_priority: i32,
+    check: F,
+}
+
+impl<F> Plugin for GenericValidator<F>
+where
+    F: Fn(&ExtractionResult, &ExtractionConfig) -> Result<()> + Send + Sync + 'static,
+{
+    fn name(&self) -> &str { &self.plugin_name }
+    fn version(&self) -> String { "1.0.0".to_string() }
+    fn initialize(&self) -> Result<()> { Ok(()) }
+    fn shutdown(&self) -> Result<()> { Ok(()) }
+}
+
+#[async_trait]
+impl<F> Validator for GenericValidator<F>
+where
+    F: Fn(&ExtractionResult, &ExtractionConfig) -> Result<()> + Send + Sync + 'static,
+{
+    async fn validate(
+        &self,
+        result: &ExtractionResult,
+        config: &ExtractionConfig,
+    ) -> Result<()> {
+        (self.check)(result, config)
+    }
+
+    fn priority(&self) -> i32 {
+        self.plugin_priority
+    }
+}
+
+fn register_generic_validator() -> Result<()> {
+    let validator = GenericValidator {
+        plugin_name: "non-empty-content".to_string(),
+        plugin_priority: 200,
+        check: |result, _config| {
+            if result.content.trim().is_empty() {
+                return Err(KreuzbergError::validation("Extracted content is blank"));
+            }
+            Ok(())
+        },
+    };
+    register_validator(Arc::new(validator))?;
+    Ok(())
+}
+```