60 lines
1.1 KiB
Go
60 lines
1.1 KiB
Go
package errors
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import (
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"errors"
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"strings"
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)
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// List represents a list of errors.
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type List struct {
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errs []error
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err error // cached error
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}
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// Append adds err to the errors list.
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func (l *List) Append(err error) {
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l.errs = append(l.errs, err)
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l.err = nil
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}
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// AppendString adds a new error that formats as the given text.
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func (l *List) AppendString(text string) {
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l.errs = append(l.errs, errors.New(text))
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l.err = nil
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}
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// Clear removes all the previously appended errors from the list.
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func (l *List) Clear() {
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for i := range l.errs {
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l.errs[i] = nil
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}
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l.errs = l.errs[:0]
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l.err = nil
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}
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// Err returns an error composed of the list of errors, separated by a new line, or nil if no errors
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// were appended.
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func (l *List) Err() error {
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if len(l.errs) == 0 {
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return nil
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}
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if l.err != nil {
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switch len(l.errs) {
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case 1:
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l.err = l.errs[0]
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default:
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var sb strings.Builder
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sb.WriteString(l.errs[0].Error())
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for _, err := range l.errs[1:] {
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sb.WriteRune('\n')
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sb.WriteString(err.Error())
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}
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l.err = errors.New(sb.String())
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}
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}
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return l.err
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}
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