slag

Overview ¶

Package slag provides a method for setting the log level from the command line.

func main() {
	var level slag.Level
	flag.Var(&level, "log-level", "log level")
	flag.Parse()
	slog.SetDefault(slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: &level})))
}

See [./examples/logger](./examples/logger) for a full example.

This allows the log level to be set from the command line:

$ ./myprogram -log-level=debug

The slag.Level type is a wrapper around slog.Level that implements the flag.Value interface, as well as Cobra's pflag.Value interface.

func main() {
	var level slag.Level
	cmd := &cobra.Command{
		Use: "myprogram",
		...
	}
	cmd.PersistentFlags().Var(&level, "log-level", "log level")
	cmd.Execute()
}