// Exec actually performs the tee
func (tee *SomeTee) Invoke(invocation *someutils.Invocation) (error, int) {
invocation.ErrPipe.Drain()
invocation.AutoHandleSignals()
flag := os.O_CREATE
if tee.isAppend {
flag = flag | os.O_APPEND
}
writeables := uggo.ToWriteableOpeners(tee.args, flag, 0666)
files, err := uggo.OpenAll(writeables)
if err != nil {
return err, 1
}
writers := []io.Writer{invocation.MainPipe.Out}
for _, file := range files {
writers = append(writers, file)
}
multiwriter := io.MultiWriter(writers...)
_, err = io.Copy(multiwriter, invocation.MainPipe.In)
if err != nil {
return err, 1
}
for _, file := range files {
err = file.Close()
if err != nil {
return err, 1
}
}
return nil, 0
}
func Tee(call []string) error {
options := TeeOptions{}
flagSet := uggo.NewFlagSetDefault("tee", "", VERSION)
flagSet.AliasedBoolVar(&options.isAppend, []string{"a", "append"}, false, "Append instead of overwrite")
err := flagSet.Parse(call[1:])
if err != nil {
return err
}
if flagSet.ProcessHelpOrVersion() {
return nil
}
flag := os.O_CREATE
if options.isAppend {
flag = flag | os.O_APPEND
}
writeables := flagSet.ArgsAsWriteables(flag, 0666)
files, err := uggo.OpenAll(writeables)
if err != nil {
return err
}
writers := []io.Writer{os.Stdout}
for _, file := range files {
writers = append(writers, file)
}
multiwriter := io.MultiWriter(writers...)
_, err = io.Copy(multiwriter, os.Stdin)
if err != nil {
return err
}
for _, file := range files {
err = file.Close()
if err != nil {
return err
}
}
return nil
}