can add new line

edit.jai

@@ -71,6 +71,7 @@ main :: () {
                     case .ESCAPE; should_quit = true;
 
                     case .BACKSPACE; handle_backspace();
+                    case .ENTER;     handle_enter();
 
                     case .ARROW_UP;    #through;
                     case .ARROW_DOWN;  #through;
@@ -192,6 +193,20 @@ handle_window_resizes :: (window: Window_Type) {
     }
 }
 
+handle_enter :: () {
+    cursor_line_index := cursor_y + first_line;
+    current_line := *lines[cursor_line_index];
+
+    new_line := [..]u8.{};
+    array_add(*new_line, array_view(current_line.*, cursor_x));
+
+    array_insert_at(*lines, new_line, cursor_y + 1);
+    current_line.count = cursor_x;
+
+    cursor_y += 1;
+    cursor_x = 0;
+}
+
 handle_backspace :: () {
     if cursor_x == 0 && cursor_y == 0 {
         return;