feat: progress

internal/engine/engine.go

@@ -24,9 +24,9 @@ func New(config *config.Config, expression *lambda.Expression) *Engine {
 func (e Engine) Run() {
 	e.Emit("start")
 
-	for lambda.ReduceOnce(e.Expression) {
+	lambda.ReduceAll(e.Expression, func() {
 		e.Emit("step")
-	}
+	})
 
 	e.Emit("end")
 }