1 files changed, 113 insertions, 0 deletions
diff --git a/vendor/github.com/lunixbochs/vtclean/line.go b/vendor/github.com/lunixbochs/vtclean/line.go
new file mode 100644
index 000000000..66ee990be
--- /dev/null
+++ b/vendor/github.com/lunixbochs/vtclean/line.go
@@ -0,0 +1,113 @@
+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())
+}