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