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package errors
import "strings"
// Join returns an error that wraps the given errors.
// Any nil error values are discarded.
// Join returns nil if every value in errs is nil.
// The error formats as the concatenation of the strings obtained
// by calling the Error method of each element of errs, with a newline
// between each string.
//
// A non-nil error returned by Join implements the Unwrap() []error method.
//
// This is copied from Go 1.20 errors.Unwrap, with some tuning to avoid using unsafe.
// The main goal is to have this available in older Go versions.
func Join(errs ...error) error {
var nonNil []error
for _, err := range errs {
if err == nil {
continue
}
nonNil = append(nonNil, err)
}
if len(nonNil) == 0 {
return nil
}
return &joinError{
errs: nonNil,
}
}
type joinError struct {
errs []error
}
func (e *joinError) Error() string {
strs := make([]string, 0, len(e.errs))
for _, err := range e.errs {
strs = append(strs, err.Error())
}
return strings.Join(strs, "\n")
}
func (e *joinError) Unwrap() []error {
return e.errs
}
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