buffer

func Add(add rune) (requiredUpdates int)

func Down(oldX int, isInsert bool) (possible bool, newX int)

func Init(name string) (arr []rune)

func Left() (possible bool)

func Remove() (possible bool, requiredUpdates int)

func Right(isInsert bool) (possible bool)

func Save() (err error)

func Up(oldX int, isInsert bool) (possible bool, newX int)