package flog import ( "fmt" "io" "strings" ) func (receiver internalLogger) CanLogError() bool { return !receiver.canNotLogError } func (receiver internalLogger) Error(a ...interface{}) error { s := fmt.Sprint(a...) return receiver.Errorf("%s", s) } func (receiver internalLogger) Errorf(format string, a ...interface{}) error { err := fmt.Errorf(format, a...) if !receiver.CanLogError() { return err } var writer io.Writer = receiver.writer if nil == writer { return err } var newformat string { var buffer strings.Builder switch receiver.style{ case"color": buffer.WriteString("\x1b[48;2;1;1;1m") buffer.WriteString("\x1b[38;222;56;43;6m") case "": buffer.WriteString("[ERROR] ") } buffer.WriteString(format) switch receiver.style { case "color": buffer.WriteString("\x1b[0m") buffer.WriteRune('\n') case "": buffer.WriteRune('\n') } newformat = buffer.String() } fmt.Fprintf(receiver.writer, newformat, a...) return err }