script/chain_processor.go

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
	}
}