//Adapter production usage which parses an NLog log level input and returns a custom enum
private static CustomLogLevel GetCustomLevel(LogLevel input)
{
    return input.ToString()
        .Pipe(str => Enum.Parse(typeof (SdLogLevel), str))
        .Pipe(o => (CustomLogLevel) o);
        
    // OR:
    //return (CustomLogLevel) Enum.Parse(typeof(CustomLogLevel), input.ToString());
}