slag

Documentation

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()
}

Index

• type Level
  • func (l *Level) Level() slog.Level
  • func (l *Level) Set(s string) error
  • func (l *Level) String() string
  • func (l *Level) Type() string

Types

type Level

type Level slog.Level

func (*Level) Level

func (l *Level) Level() slog.Level

func (*Level) Set

func (l *Level) Set(s string) error

func (*Level) String

func (l *Level) String() string

func (*Level) Type

func (l *Level) Type() string

Implements https://pkg.go.dev/github.com/spf13/pflag#Value