Function ParseFlagsWithoutArgumentsWithEnv

flagext/parse.go:50–64

ParseFlagsWithoutArgumentsWithEnv is like [ParseFlagsWithoutArguments] but also sets flag values from environment variables using [SetFlagsFromEnv]. CLI flags take precedence over environment variables, which take precedence over default values.

(f *flag.FlagSet, prefix string)

// CLI flags take precedence over environment variables, which take precedence
// over default values.
func ParseFlagsWithoutArgumentsWithEnv(f *flag.FlagSet, prefix string) error {
	if err := f.Parse(os.Args[1:]); err != nil {
		return err
	}

	if err := SetFlagsFromEnv(f, prefix); err != nil {
		return err
	}

	if f.NArg() > 0 {
		return fmt.Errorf("the command does not support any argument, but some were provided: %s", strings.Join(f.Args(), " "))
	}

	return nil
}