code: func Code(p tview.Primitive, width, height int, code string) tview.Primitive {
  	// Set up code view.
  	codeView := tview.NewTextView().
  		SetWrap(false).
  		SetDynamicColors(true)
  	codeView.SetBorderPadding(1, 1, 2, 0)
  	fmt.Fprint(codeView, code)
  
  	return tview.NewFlex().
  		AddItem(Center(width, height, p), 0, 1, true).
  		AddItem(codeView, codeWidth, 1, false)
  }
docs: // Code returns a primitive which displays the given primitive (with the given
  // size) on the left side and its source code on the right side.