package output import ( "bytes" "io" ) type Group struct{} func (Group) WrapWriter(w io.Writer, _ string) io.Writer { return &groupWriter{writer: w} } type groupWriter struct { writer io.Writer buff bytes.Buffer } func (gw *groupWriter) Write(p []byte) (int, error) { return gw.buff.Write(p) } func (gw *groupWriter) Close() error { _, err := io.Copy(gw.writer, &gw.buff) return err }