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multi_error.go
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multi_error.go
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package packer
import (
"fmt"
"strings"
)
// MultiError is an error type to track multiple errors. This is used to
// accumulate errors in cases such as configuration parsing, and returning
// them as a single error.
type MultiError struct {
Errors []error
}
func (e *MultiError) Error() string {
points := make([]string, len(e.Errors))
for i, err := range e.Errors {
points[i] = fmt.Sprintf("* %s", err)
}
return fmt.Sprintf(
"%d error(s) occurred:\n\n%s",
len(e.Errors), strings.Join(points, "\n"))
}
// MultiErrorAppend is a helper function that will append more errors
// onto a MultiError in order to create a larger multi-error. If the
// original error is not a MultiError, it will be turned into one.
func MultiErrorAppend(err error, errs ...error) *MultiError {
if err == nil {
err = new(MultiError)
}
switch err := err.(type) {
case *MultiError:
if err == nil {
err = new(MultiError)
}
err.Errors = append(err.Errors, errs...)
return err
default:
newErrs := make([]error, len(errs)+1)
newErrs[0] = err
copy(newErrs[1:], errs)
return &MultiError{
Errors: newErrs,
}
}
}