69 lines
1.2 KiB
Go
69 lines
1.2 KiB
Go
package union
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import (
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"bytes"
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"fmt"
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)
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// The Errors type wraps a slice of errors
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type Errors []error
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// Map returns a copy of the error slice with all its errors modified
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// according to the mapping function. If mapping returns nil,
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// the error is dropped from the error slice with no replacement.
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func (e Errors) Map(mapping func(error) error) Errors {
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s := make([]error, len(e))
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i := 0
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for _, err := range e {
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nerr := mapping(err)
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if nerr == nil {
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continue
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}
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s[i] = nerr
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i++
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}
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return Errors(s[:i])
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}
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// FilterNil returns the Errors without nil
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func (e Errors) FilterNil() Errors {
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ne := e.Map(func(err error) error {
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return err
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})
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return ne
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}
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// Err returns a error interface that filtered nil,
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// or nil if no non-nil Error is presented.
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func (e Errors) Err() error {
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ne := e.FilterNil()
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if len(ne) == 0 {
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return nil
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}
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return ne
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}
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// Error returns a concatenated string of the contained errors
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func (e Errors) Error() string {
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var buf bytes.Buffer
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if len(e) == 0 {
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buf.WriteString("no error")
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}
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if len(e) == 1 {
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buf.WriteString("1 error: ")
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} else {
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fmt.Fprintf(&buf, "%d errors: ", len(e))
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}
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for i, err := range e {
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if i != 0 {
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buf.WriteString("; ")
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}
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buf.WriteString(err.Error())
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}
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return buf.String()
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}
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