Code snippet from github.com/appliedgo/tui: termui

tui2termui.go

func runTermui() {
	// Initialize termui.
	err := t.Init()
	if err != nil {
		log.Fatalln("Cannot initialize termui")
	}
	// `termui` needs some cleanup when terminating.
	defer t.Close()

	// Get the height of the terminal.
	th := t.TermHeight()

	// The list block
	lb := t.NewList()
	lb.Height = th
	lb.BorderLabel = "List"
	lb.BorderLabelFg = t.ColorGreen
	lb.BorderFg = t.ColorGreen
	lb.ItemFgColor = t.ColorWhite
	lb.Items = listItems

	// The input block. termui has no edit box yet, but at the time of
	// this writing, there is an open [pull request](https://github.com/gizak/termui/pull/129) for adding
	// a text input widget.
	ib := t.NewPar("")
	ib.Height = ih
	ib.BorderLabel = "Input"
	ib.BorderLabelFg = t.ColorYellow
	ib.BorderFg = t.ColorYellow
	ib.TextFgColor = t.ColorWhite

	// The Output block.
	ob := t.NewPar("\nPress Ctrl-C to quit")
	ob.Height = th - ih
	ob.BorderLabel = "Output"
	ob.BorderLabelFg = t.ColorCyan
	ob.BorderFg = t.ColorCyan
	ob.TextFgColor = t.ColorWhite

	// Now we need to create the layout. The blocks have gotten a size
	// but no position. A grid layout puts everything into place.
	// t.Body is a pre-defined grid. We add one row that contains
	// two columns.
	//
	// The grid uses a 12-column system, so we have to give a "span"
	// parameter to each column that specifies how many grid column
	// each column occupies.
	t.Body.AddRows(
		t.NewRow(
			t.NewCol(3, 0, lb),
			t.NewCol(9, 0, ob, ib)))

	// Render the grid.
	t.Body.Align()
	t.Render(t.Body)

	// When the window resizes, the grid must adopt to the new size.
	// We use a hander func for this.
	t.Handle("/sys/wnd/resize", func(t.Event) {
		// Update the heights of list box and output box.
		lb.Height = t.TermHeight()
		ob.Height = t.TermHeight() - ih
		t.Body.Width = t.TermWidth()
		t.Body.Align()
		t.Render(t.Body)
	})

	//

	// We need a way out. Ctrl-C shall stop the event loop.
	t.Handle("/sys/kbd/C-c", func(t.Event) {
		t.StopLoop()
	})

	// start the event loop.
	t.Loop()
}