Method MoveLinesUp

internal/buffer/buffer.go:1129–1151

MoveLinesUp moves the range of lines up one row

(start int, end int)

// MoveLinesUp moves the range of lines up one row
func (b *Buffer) MoveLinesUp(start int, end int) {
	if start < 1 || start >= end || end > len(b.lines) {
		return
	}
	l := string(b.LineBytes(start - 1))
	if end == len(b.lines) {
		b.insert(
			Loc{
				util.CharacterCount(b.lines[end-1].data),
				end - 1,
			},
			[]byte{'\n'},
		)
	}
	b.Insert(
		Loc{0, end},
		l+"\n",
	)
	b.Remove(
		Loc{0, start - 1},
		Loc{0, start},
	)
}

// MoveLinesDown moves the range of lines down one row
func (b *Buffer) MoveLinesDown(start int, end int) {