feat(traverse): Add output-at helper method (#124)

pallas-traverse/src/lib.rs

@@ -52,7 +52,7 @@ pub enum MultiEraBlock<'b> {
     Byron(Box<Cow<'b, byron::MintedBlock<'b>>>),
 }
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 #[non_exhaustive]
 pub enum MultiEraTx<'b> {
     AlonzoCompatible(Box<Cow<'b, alonzo::MintedTx<'b>>>, Era),

pallas-traverse/src/tx.rs

@@ -67,6 +67,21 @@ impl<'b> MultiEraTx<'b> {
         }
     }
 
+    pub fn output_at(&self, index: usize) -> Option<MultiEraOutput> {
+        match self {
+            MultiEraTx::AlonzoCompatible(x, _) => x
+                .transaction_body
+                .outputs
+                .get(index)
+                .map(MultiEraOutput::from_alonzo_compatible),
+            MultiEraTx::Byron(x) => x
+                .transaction
+                .outputs
+                .get(index)
+                .map(MultiEraOutput::from_byron),
+        }
+    }
+
     pub fn inputs(&self) -> Vec<MultiEraInput> {
         match self {
             MultiEraTx::AlonzoCompatible(x, _) => x