source

type EnvOption func(*envSource) error

type FileCodec interface {
	TagName() string
	ExtName() string
	Encode(path string, v any) error
	Decode(path string, v any) error
}

type FileOption func(*fileSource) error

type FlagOption func(*flagSource) error

type FlagSet interface {
	PrintDefaults()
	Parse([]string) error
	Parsed() bool

	TextVar(p encoding.TextUnmarshaler, name string, value encoding.TextMarshaler, usage string)
	StringVar(v *string, name string, defaultValue string, usage string)
	BoolVar(v *bool, name string, defaultValue bool, usage string)
}

type JSON struct{}

type Source interface {
	Register(fset FlagSet, fields []structtags.Field) error
	Parse(ctx context.Context, args []string) error
	Error() error
}