Expose canonical paths on command invocations

identity.go

@@ -34,4 +34,15 @@ type Invocation struct {
 	Context context.Context
 	// Streams are the caller-selected output destinations.
 	Streams Streams
+
+	enteredPath   string
+	canonicalPath string
 }
+
+// EnteredPath returns the command path used to invoke the selected command.
+// It is empty for an Invocation that was not created by command execution.
+func (inv Invocation) EnteredPath() string { return inv.enteredPath }
+
+// CanonicalPath returns the selected command's canonical path.
+// It is empty for an Invocation that was not created by command execution.
+func (inv Invocation) CanonicalPath() string { return inv.canonicalPath }