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// 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()
// }
package slag
import "log/slog"
type Level slog.Level
func (l *Level) Set(s string) error {
var ll slog.Level
if err := ll.UnmarshalText([]byte(s)); err != nil {
return err
}
*l = Level(ll)
return nil
}
func (l *Level) String() string { return slog.Level(*l).String() }
func (l *Level) Level() slog.Level { return slog.Level(*l) }
// Implements https://pkg.go.dev/github.com/spf13/pflag#Value
func (l *Level) Type() string { return "string" }
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