structure change

utils.go

@@ -0,0 +1,77 @@
+package osui
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"golang.org/x/term"
+)
+
+func renderLine(frameLine, line string, x int) string {
+	result := ""
+	if x >= len(frameLine) {
+		return result
+	}
+
+	lChars := []rune(line)
+	for i, c := range frameLine {
+		if i >= x && len(lChars) > i-x {
+			result += string(lChars[i-x])
+		} else {
+			result += string(c)
+		}
+	}
+	return result
+}
+
+func RenderOnFrame(c Component, frame *[]string) {
+	componentData := c.GetComponentData()
+	for i, line := range strings.Split(c.Render(), "\n") {
+		if int(componentData.Y)+i < len(*frame) {
+			(*frame)[int(componentData.Y)+i] = renderLine((*frame)[int(componentData.Y)+i], line, int(componentData.X))
+		}
+	}
+}
+
+func ReadKey() (string, error) {
+	oldState, err := term.MakeRaw(int(os.Stdin.Fd()))
+	if err != nil {
+		return "", err
+	}
+	defer term.Restore(int(os.Stdin.Fd()), oldState)
+	var b [3]byte
+	n, err := os.Stdin.Read(b[:])
+	if err != nil {
+		return "", err
+	}
+	return string(b[:n]), nil
+}
+
+func Clear() {
+	fmt.Print("\x1b[H\x1b[2J\x1b[3J")
+}
+
+type Key_ = string
+
+type key struct {
+	Enter     Key_
+	Tab       Key_
+	Backspace Key_
+	Escape    Key_
+	Up        Key_
+	Down      Key_
+	Right     Key_
+	Left      Key_
+}
+
+var Key = key{
+	Enter:     "\r",
+	Tab:       "\t",
+	Backspace: "\x7f",
+	Escape:    "\x1b",
+	Up:        "\x1b[A",
+	Down:      "\x1b[B",
+	Right:     "\x1b[C",
+	Left:      "\x1b[D",
+}