add a piece table insertion test

src/gui/Window.cc

@@ -268,6 +268,9 @@ void Window::handle_key(uint32_t scancode, uint32_t mod)
     case SDL_SCANCODE_L:
         cursor_move(CURSOR_RIGHT);
         break;
+    case SDL_SCANCODE_P:
+        insertion_test();
+        break;
     }
 }
 
@@ -521,3 +524,9 @@ void Window::draw_status_bar()
         x += m_font.get_advance();
     }
 }
+
+void Window::insertion_test()
+{
+    m_buffer->piece_table->insertion_test(*m_cursor);
+    redraw();
+}

src/gui/Window.h

@@ -42,6 +42,7 @@ protected:
     void update_cursor_row(int cursor_row);
     void draw_rect(int x, int y, int width, int height, float r, float g, float b, float a);
     void draw_status_bar();
+    void insertion_test();
 
     SDL_Window * m_window;
     bool m_exit_requested;