accounts/abi/bind: support event filtering in abigen

accounts/abi/event.go

@@ -33,6 +33,17 @@ type Event struct {
 	Inputs    Arguments
 }
 
+func (event Event) String() string {
+	inputs := make([]string, len(event.Inputs))
+	for i, input := range event.Inputs {
+		inputs[i] = fmt.Sprintf("%v %v", input.Name, input.Type)
+		if input.Indexed {
+			inputs[i] = fmt.Sprintf("%v indexed %v", input.Name, input.Type)
+		}
+	}
+	return fmt.Sprintf("event %v(%v)", event.Name, strings.Join(inputs, ", "))
+}
+
 // Id returns the canonical representation of the event's signature used by the
 // abi definition to identify event names and types.
 func (e Event) Id() common.Hash {