Adds home end delete and backspace, starts overflow solutions

main.go

@@ -26,16 +26,34 @@ const (
 	BackSpace rune = 127
 )
 
+var (
+	width int
+)
+
 type Buffer struct {
 	buf []rune
 	cursor int
+	maxWidth int
+	offset int
 }
 
 func (lb Buffer) String() string {
 	return string(lb.buf)
 }
 
-func (lb *Buffer) AddChar(c rune, echo bool) {
+func (lb *Buffer) deleteChar() {
+	if lb.cursor == len(lb.buf) {
+		return
+	} else if lb.cursor == len(lb.buf)-1 {
+		lb.buf = lb.buf[:len(lb.buf)-1]
+		fmt.Printf("\033[0K")
+	} else {
+		lb.buf = append(lb.buf[:lb.cursor], lb.buf[lb.cursor+1:]...)
+		fmt.Printf("%s\033[0K\033[%dD", string(lb.buf[lb.cursor:]), len(lb.buf)-lb.cursor)
+	}
+}
+
+func (lb *Buffer) addChar(c rune, echo bool) {
 	if lb.cursor == len(lb.buf) {
 		lb.buf = append(lb.buf, c)
 		lb.cursor++
@@ -55,9 +73,12 @@ func (lb *Buffer) AddChar(c rune, echo bool) {
 
 func (lb *Buffer) controlInput(c rune) {
 	switch c {
+	case Delete:
+		lb.deleteChar()
 	case BackSpace:
 		lb.cursor--
-		fmt.Printf("%c", BackSpace)
+		fmt.Print("\033[1D")
+		lb.deleteChar()
 	case LeftArrow:
 		if lb.cursor > 0 {
 			lb.cursor--
@@ -68,17 +89,24 @@ func (lb *Buffer) controlInput(c rune) {
 			lb.cursor++
 			fmt.Print("\033[1C")
 		}
+	case Home:
+		fmt.Printf("\033[%dD", lb.cursor)
+		lb.cursor = 0
+	case End:
+		fmt.Printf("\033[%dC", len(lb.buf)-lb.cursor)
+		lb.cursor = len(lb.buf)
 	}
 }
 
 func (lb *Buffer) seedContent(s string) {
 	for _, r := range s {
-		lb.AddChar(r, false)
+		lb.addChar(r, false)
 	}
 }
 
-func GetText(prompt string, content string, endChar rune, includeEndChar bool) string {
+func GetText(prompt string, content string) string {
-	b := Buffer{make([]rune, 0, (len(content)+1)*2), 0}
+	cols, _ := termios.GetWindowSize()
+	b := Buffer{make([]rune, 0, (len(content)+1)*2), 0, cols-len(prompt), 0}
 	b.seedContent(content)
 
 	fmt.Print(prompt)
@@ -93,17 +121,14 @@ func GetText(prompt string, content string, endChar rune, includeEndChar bool) s
 		if err != nil {
 			continue
 		}
-		if ch == endChar {
+		if ch == CarriageReturn || ch == NewLine {
-			if includeEndChar {
-				b.AddChar(ch, true)
-			}
 			break
 		}
 
 		if isControl(ch) {
 			b.controlInput(ch)
 		} else {
-			b.AddChar(ch, true)
+			b.addChar(ch, true)
 		}
 
 	}
@@ -230,6 +255,6 @@ func main() {
 
 	for {
 		fmt.Print("\n")
-		str = GetText("> ", str, '\n', false)
+		str = GetText("> ", str)
 	}
 }