package multierror
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import (
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"fmt"
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"github.com/hashicorp/errwrap"
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)
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// Prefix is a helper function that will prefix some text
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// to the given error. If the error is a multierror.Error, then
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// it will be prefixed to each wrapped error.
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//
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// This is useful to use when appending multiple multierrors
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// together in order to give better scoping.
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func Prefix(err error, prefix string) error {
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if err == nil {
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return nil
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}
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format := fmt.Sprintf("%s {{err}}", prefix)
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switch err := err.(type) {
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case *Error:
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// Typed nils can reach here, so initialize if we are nil
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if err == nil {
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err = new(Error)
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}
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// Wrap each of the errors
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for i, e := range err.Errors {
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err.Errors[i] = errwrap.Wrapf(format, e)
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}
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return err
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default:
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return errwrap.Wrapf(format, err)
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}
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}
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