Exit Game in Ebiten

package main

import (
    "errors"
    "github.com/hajimehoshi/ebiten/v2"
    "github.com/hajimehoshi/ebiten/v2/ebitenutil"
    "log"
)

var errRegularTermination = errors.New("regular termination")

type Game struct {
    exit bool
}

func (g *Game) Layout(width, height int) (int, int) {
    return width, height
}

func (g *Game) Update() error {
    if ok, exitGame := g.verifyExit(); ok {
        return exitGame
    }

    return nil
}

func (g *Game) Draw(screen *ebiten.Image) {
    g.checkExitstatus(screen)
}

func (g *Game) verifyExit() (bool, error) {
    if ebiten.IsKeyPressed(ebiten.KeyEscape) || ebiten.IsWindowBeingClosed() {
        g.exit = true
    }

    if g.exit {
        if ebiten.IsKeyPressed(ebiten.KeyY) {
            return true, errRegularTermination
        }

        if ebiten.IsKeyPressed(ebiten.KeyN) {
            g.exit = false
        }
    }

    return false, nil
}

func (g *Game) checkExitstatus(screen *ebiten.Image) {
    if g.exit {
        ebitenutil.DebugPrint(screen, "Do you really want to close this window? [y/n]")

        return
    }
}


func main() {
    ebiten.SetWindowClosingHandled(true)
    // nolint: exhaustivestruct
    if err := ebiten.RunGame(&Game{}); err != nil && !errors.Is(err, errRegularTermination) {
        log.Fatal(err)
    }
}