Spoor is a logging package with support for 2 log levels, Info, and Debug. The package includes a standard logger. It's accessible using spoor.Infof and spoor.Debugf. The arguments to either are the same as for fmt.Printf. The standard logger logs both Info and Debug level logs to stderr using a log.Logger. Remember that log.logger appends a newline if one is not present in the text to be logged. Use spoor.DebugOn() and spoor.DebugOff() to activate and deactivate the debug logger.
Alternatively you can create your own logger using spoor.New(info *log.Logger, debug *log.Logger), where info and debug are the Info and Debug level loggers respectively.