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package multierr
import (
"fmt"
"strings"
)
// Format creates an error value from the input array (which should not be empty)
// If the input contains a single error value, it is returned as is.
// If there are multiple, they are formatted as a multi-error (with Unwrap() []error) with the provided initial, separator, and ending strings.
//
// Typical usage:
//
// var errs []error
// // …
// errs = append(errs, …)
// // …
// if errs != nil { return multierr.Format("Failures doing $FOO", "\n* ", "", errs)}
func Format(first, middle, last string, errs []error) error {
switch len(errs) {
case 0:
return fmt.Errorf("internal error: multierr.Format called with 0 errors")
case 1:
return errs[0]
default:
// We have to do this — and this function only really exists — because fmt.Errorf(format, errs...) is invalid:
// []error is not a valid parameter to a function expecting []any
anyErrs := make([]any, 0, len(errs))
for _, e := range errs {
anyErrs = append(anyErrs, e)
}
return fmt.Errorf(first+"%w"+strings.Repeat(middle+"%w", len(errs)-1)+last, anyErrs...)
}
}
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