remove dead code (TeeEmitter)

teeemitter.go

-package cmds
-
-import (
-	"github.com/ipfs/go-ipfs-cmdkit"
-)
-
-// NewTeeEmitter creates a new ResponseEmitter.
-// Writing to it will write to both the passed ResponseEmitters.
-func NewTeeEmitter(re1, re2 ResponseEmitter) ResponseEmitter {
-	return &teeEmitter{re1, re2}
-}
-
-type teeEmitter struct {
-	ResponseEmitter
-
-	re ResponseEmitter
-}
-
-func (re *teeEmitter) Close() error {
-	err1 := re.ResponseEmitter.Close()
-	err2 := re.re.Close()
-
-	if err1 != nil {
-		return err1
-	}
-
-	// XXX we drop the second error if both fail
-	return err2
-}
-
-func (re *teeEmitter) Emit(v interface{}) error {
-	err1 := re.ResponseEmitter.Emit(v)
-	err2 := re.re.Emit(v)
-
-	if err1 != nil {
-		return err1
-	}
-
-	// XXX we drop the second error if both fail
-	return err2
-}
-
-func (re *teeEmitter) SetLength(l uint64) {
-	re.ResponseEmitter.SetLength(l)
-	re.re.SetLength(l)
-}
-
-func (re *teeEmitter) SetError(err interface{}, code cmdkit.ErrorType) {
-	re.ResponseEmitter.SetError(err, code)
-	re.re.SetError(err, code)
-}
-
-type TeeError struct {
-	err1, err2 error
-}
-
-func (err TeeError) BothNil() bool {
-	return err.err1 == nil && err.err2 == nil
-}
-
-func (err TeeError) Error() string {
-	if err.err1 != nil && err.err2 != nil {
-		return "1: " + err.err1.Error() + "\n2: " + err.err2.Error()
-	} else if err.err1 != nil {
-		return "1: " + err.err1.Error()
-	} else if err.err2 != nil {
-		return "2: " + err.err2.Error()
-	} else {
-		return ""
-	}
-}