feat: add run result

chain_processor.go

@@ -0,0 +1,23 @@
+package script
+
+import "context"
+
+// Chain chains provided Processors.
+// When an error is returned by a Processor in chain, processing
+// stops and the error is retuned without running further stages.
+func Chain(processors ...Processor) Processor {
+	return func(ctx context.Context, in []string) ([]string, error) {
+		var err error
+		for _, p := range processors {
+			// not checking ctx expiry here,
+			// let the processor handle it
+
+			in, err = p(ctx, in)
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		return in, nil
+	}
+}