Method SaveState

undo/undo.go:183–193

SaveState saves given record of state at given index

(nr *Record, idx int, state []string)

// SaveState saves given record of state at given index
func (us *Stack) SaveState(nr *Record, idx int, state []string) {
	if idx%us.RawInterval == 0 {
		nr.Raw = state
		us.Mu.Unlock()
		return
	}
	prv := us.RecState(idx - 1)
	dif := text.DiffLines(prv, state)
	nr.Patch = dif.ToPatch(state)
	us.Mu.Unlock()
}

// HasUndoAvail returns true if there is at least one undo record available.
// This does NOT get the lock -- may rarely be inaccurate but is used for