Simple example of gocui that responds to the arrow keys by moving the message around on the screen

gocui-example.go

package main

import (
	"errors"
	"fmt"
	"log"

	"github.com/awesome-gocui/gocui"
)

var offsetX int = 0
var offsetY int = 0

func main() {
	// Create the UI object
	g, err := gocui.NewGui(gocui.OutputNormal, true)
	if err != nil {
		log.Panicln(err)
	}
	defer g.Close()
	// Set the view layout manager
	g.SetManagerFunc(layout)
	// Define keystrokes
	err = g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit)
	if err != nil {
		log.Panicln(err)
	}
	g.SetKeybinding("", gocui.KeyArrowDown, gocui.ModNone, func(g *gocui.Gui, v *gocui.View) error {
		offsetY -= 1
		return nil
	})
	g.SetKeybinding("", gocui.KeyArrowUp, gocui.ModNone, func(g *gocui.Gui, v *gocui.View) error {
		offsetY += 1
		return nil
	})
	g.SetKeybinding("", gocui.KeyArrowLeft, gocui.ModNone, func(g *gocui.Gui, v *gocui.View) error {
		offsetX += 1
		return nil
	})
	g.SetKeybinding("", gocui.KeyArrowRight, gocui.ModNone, func(g *gocui.Gui, v *gocui.View) error {
		offsetX -= 1
		return nil
	})
	if err != nil {
		log.Panicln(err)
	}
	// Run the main loop
	err = g.MainLoop()
	if err != nil && !errors.Is(err, gocui.ErrQuit) {
		log.Panicln(err)
	}
}

func layout(g *gocui.Gui) error {
	maxX, maxY := g.Size()
	v, err := g.SetView("hello", maxX/2-7-offsetX, maxY/2-offsetY, maxX/2+7-offsetX, maxY/2+2-offsetY, 0)
	if err != nil {
		if !errors.Is(err, gocui.ErrUnknownView) {
			return err
		}
		_, err = g.SetCurrentView("hello")
		if err != nil {
			return err
		}
		fmt.Fprintln(v, "hello world")
	}
	return nil
}

func quit(g *gocui.Gui, v *gocui.View) error {
	return gocui.ErrQuit
}