flog

type Config struct {
	// Name will be used in the prefix of each log line.
	Name string
	// CriticalWriter will accept Critical level log output. If set to nil, the
	// default os.Stderr will be used. To discard all Critical level output,
	// set to an instance of brimio.NullIO.
	CriticalWriter io.Writer
	// ErrorWriter will accept Error level log output. If set to nil, the
	// default os.Stderr will be used. To discard all Error level output, set
	// to an instance of brimio.NullIO.
	ErrorWriter io.Writer
	// WarningWriter will accept Warning level log output. If set to nil, the
	// default os.Stderr will be used. To discard all Warning level output, set
	// to an instance of brimio.NullIO.
	WarningWriter io.Writer
	// InfoWriter will accept Info level log output. If set to nil, the default
	// os.Stdout will be used. To discard all Info level output, set to
	// an instance of brimio.NullIO.
	InfoWriter io.Writer
	// DebugWriter will accept Debug level log output. If set to nil, the
	// default is to discard all Debug level output.
	DebugWriter io.Writer
}

type Flog interface {
	// CriticalPrintf logs the result of fmt.Sprintf(format, args).
	CriticalPrintf(format string, args ...interface{})
	// CriticalPrintln logs the result of fmt.Sprintln(args).
	CriticalPrintln(args ...interface{})
	// ErrorPrintf logs the result of fmt.Sprintf(format, args).
	ErrorPrintf(format string, args ...interface{})
	// ErrorPrintln logs the result of fmt.Sprintln(args).
	ErrorPrintln(args ...interface{})
	// WarningPrintf logs the result of fmt.Sprintf(format, args).
	WarningPrintf(format string, args ...interface{})
	// WarningPrintln logs the result of fmt.Sprintln(args).
	WarningPrintln(args ...interface{})
	// InfoPrintf logs the result of fmt.Sprintf(format, args).
	InfoPrintf(format string, args ...interface{})
	// InfoPrintln logs the result of fmt.Sprintln(args).
	InfoPrintln(args ...interface{})
	// DebugPrintf logs the result of fmt.Sprintf(format, args).
	DebugPrintf(format string, args ...interface{})
	// DebugPrintln logs the result of fmt.Sprintln(args).
	DebugPrintln(args ...interface{})
	// Sub creates a new Flog instance based on this one, possibly with
	// overrides from the given Config. If Config.Name is set, it will be
	// appended to the original Flog instance's name.
	Sub(c *Config) Flog
}

type Logger interface {
	// Fatal is equivalent to Print() followed by a call to os.Exit(1).
	Fatal(args ...interface{})
	// Fatalf is equivalent to Printf() followed by a call to os.Exit(1).
	Fatalf(format string, args ...interface{})
	// Fatalln is equivalent to Println() followed by a call to os.Exit(1).
	Fatalln(args ...interface{})
	// Print calls Output to print to the standard logger. Arguments are
	// handled in the manner of fmt.Print.
	Print(args ...interface{})
	// Printf calls Output to print to the standard logger. Arguments are
	// handled in the manner of fmt.Printf.
	Printf(format string, args ...interface{})
	// Println calls Output to print to the standard logger. Arguments are
	// handled in the manner of fmt.Println.
	Println(args ...interface{})
}