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package vtclean
type char struct {
char byte
vt100 []byte
}
func chars(p []byte) []char {
tmp := make([]char, len(p))
for i, v := range p {
tmp[i].char = v
}
return tmp
}
type lineEdit struct {
buf []char
pos, size int
vt100 []byte
}
func newLineEdit(length int) *lineEdit {
return &lineEdit{buf: make([]char, length)}
}
func (l *lineEdit) Vt100(p []byte) {
l.vt100 = p
}
func (l *lineEdit) Move(x int) {
if x < 0 && l.pos <= -x {
l.pos = 0
} else if x > 0 && l.pos+x > l.size {
l.pos = l.size
} else {
l.pos += x
}
}
func (l *lineEdit) MoveAbs(x int) {
if x < l.size {
l.pos = x
}
}
func (l *lineEdit) Write(p []byte) {
c := chars(p)
if len(c) > 0 {
c[0].vt100 = l.vt100
l.vt100 = nil
}
if len(l.buf)-l.pos < len(c) {
l.buf = append(l.buf[:l.pos], c...)
} else {
copy(l.buf[l.pos:], c)
}
l.pos += len(c)
if l.pos > l.size {
l.size = l.pos
}
}
func (l *lineEdit) Insert(p []byte) {
c := chars(p)
if len(c) > 0 {
c[0].vt100 = l.vt100
l.vt100 = nil
}
l.size += len(c)
c = append(c, l.buf[l.pos:]...)
l.buf = append(l.buf[:l.pos], c...)
}
func (l *lineEdit) Delete(n int) {
most := l.size - l.pos
if n > most {
n = most
}
copy(l.buf[l.pos:], l.buf[l.pos+n:])
l.size -= n
}
func (l *lineEdit) Clear() {
for i := 0; i < len(l.buf); i++ {
l.buf[i].char = ' '
}
}
func (l *lineEdit) ClearLeft() {
for i := 0; i < l.pos+1; i++ {
l.buf[i].char = ' '
}
}
func (l *lineEdit) ClearRight() {
l.size = l.pos
}
func (l *lineEdit) Bytes() []byte {
length := 0
buf := l.buf[:l.size]
for _, v := range buf {
length += 1 + len(v.vt100)
}
tmp := make([]byte, 0, length)
for _, v := range buf {
tmp = append(tmp, v.vt100...)
tmp = append(tmp, v.char)
}
return tmp
}
func (l *lineEdit) String() string {
return string(l.Bytes())
}
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