Connect invocation execution to one reporter

identity.go

@@ -37,20 +37,22 @@ func normalizeStreams(streams Streams) Streams {
 	return streams
 }
 
-// Invocation provides execution context and output streams to a command
-// handler. For command aliases, EnteredPath and CanonicalPath expose the route
-// the caller used and the selected canonical command path. Both omit the
+// Invocation provides execution context and reporting to a command handler.
+// For command aliases, EnteredPath and CanonicalPath expose the route the
+// caller used and the selected canonical command path. Both omit the
 // executable name, flags, and operands.
 type Invocation struct {
 	// Context carries caller cancellation and request-scoped values.
 	Context context.Context
-	// Streams are the caller-selected output destinations.
-	Streams Streams
 
+	reporter      *Reporter
 	enteredPath   string
 	canonicalPath string
 }
 
+// Reporter returns the reporting facility for this invocation.
+func (inv Invocation) Reporter() *Reporter { return inv.reporter }
+
 // EnteredPath returns the command path used to invoke the selected command,
 // excluding the executable name, flags, and operands. It is empty for an
 // Invocation that was not created by command execution.