it works

cells.go

@@ -0,0 +1,90 @@
+package main
+
+type Cell struct {
+	X int
+	Y int
+	State int
+}
+
+func (c *Cell) Display() rune {
+	if c.State == 1 {
+		return '\u2588'
+	} else {
+		return ' '
+	}
+}
+
+func (c *Cell) Update(g *Game) int{
+	h, w := g.Screen.Size()
+	cs := g.Cells
+	n := 0
+	if c.X == 0 {
+		if c.Y == 0 {
+			n =	cs[c.X][c.Y+1].State +
+				cs[c.X+1][c.Y].State +
+				cs[c.X+1][c.Y+1].State
+		} else if c.Y < w-1 {
+			n =	cs[c.X][c.Y+1].State + 
+				cs[c.X+1][c.Y].State + 
+				cs[c.X+1][c.Y+1].State +
+				cs[c.X][c.Y-1].State +
+				cs[c.X+1][c.Y-1].State 
+		} else {
+			n =	cs[c.X+1][c.Y].State + 
+				cs[c.X][c.Y-1].State +
+				cs[c.X+1][c.Y-1].State 
+		}
+	} else if c.X == h-1 {
+		if c.Y == 0 {
+			n =	cs[c.X][c.Y+1].State +
+				cs[c.X-1][c.Y].State +
+				cs[c.X-1][c.Y+1].State
+		} else if c.Y < w-1 {
+			n =	cs[c.X][c.Y+1].State + 
+				cs[c.X-1][c.Y].State + 
+				cs[c.X-1][c.Y+1].State +
+				cs[c.X][c.Y-1].State +
+				cs[c.X-1][c.Y-1].State 
+		} else {
+			n =	cs[c.X-1][c.Y].State + 
+				cs[c.X][c.Y-1].State +
+				cs[c.X-1][c.Y-1].State 
+		}
+	} else if c.Y == 0 {
+		n =	cs[c.X-1][c.Y].State +
+			cs[c.X-1][c.Y+1].State +
+			cs[c.X][c.Y+1].State +
+			cs[c.X+1][c.Y+1].State +
+			cs[c.X+1][c.Y].State
+	} else if c.Y == w-1 {
+		n =	cs[c.X-1][c.Y].State +
+			cs[c.X-1][c.Y-1].State +
+			cs[c.X][c.Y-1].State +
+			cs[c.X+1][c.Y-1].State +
+			cs[c.X+1][c.Y].State
+	} else {
+		n =	cs[c.X-1][c.Y-1].State +
+			cs[c.X-1][c.Y].State +
+			cs[c.X-1][c.Y+1].State +
+			cs[c.X][c.Y-1].State +
+			cs[c.X][c.Y+1].State +
+			cs[c.X+1][c.Y-1].State +
+			cs[c.X+1][c.Y].State +
+			cs[c.X+1][c.Y+1].State 
+	}
+	
+	if c.State == 1 {
+		if n >= 2 && n < 4 {
+			return 1
+		} else {
+			return 0
+		}
+	} else if c.State == 0 {
+		if n == 3 {
+			return 1
+		}
+		return 0
+	} else {
+		return 0
+	}
+}

game.go

@@ -1,5 +1,146 @@
 package main
 
-func GetText() string {
+import (
-	return "My text"
+	"time"
+
+	"github.com/gdamore/tcell/v2"
+)
+
+type Game struct {
+	Screen tcell.Screen
+	Cells [][]Cell
+}
+
+func (g *Game) Run() Game{
+	s := g.Screen
+	style := tcell.StyleDefault.Background(tcell.ColorBlack).Foreground(tcell.ColorPurple)
+	s.SetStyle(style)
+
+	state := g.Cells
+	var newState [][]Cell
+	for r, h := range state {
+		var row []Cell
+		for c, _ := range h {
+			cellState := state[r][c].Update(g)	
+			cellX := r
+			cellY := c
+			newCell := Cell{
+				X: cellX,
+				Y: cellY,
+				State: cellState,
+			}
+			row = append(row, newCell)
+			s.SetContent(state[r][c].X, state[r][c].Y, state[r][c].Display(), nil, style)
+		}
+		newState = append(newState, row)
+	}
+	newGame := Game {
+		Screen: s,
+		Cells: newState,
+	}
+	s.Show()
+	time.Sleep(1*time.Millisecond)
+	s.Clear()
+	return newGame
+}
+
+func (g *Game) Glider() Game{
+	s := g.Screen
+	h, w := s.Size()
+	var states [][]int
+	for r := 0; r<h; r++ {
+		var row []int
+		for c := 0; c<w; c++ {
+			n := 0
+			row = append(row, n)
+		}
+		states = append(states, row)
+	}
+	states[111][26] = 1
+	states[112][27] = 1
+	states[113][27] = 1
+	states[113][26] = 1
+	states[113][25] = 1
+
+	var cells [][]Cell
+	for r := 0; r<h; r++ {
+		var row []Cell
+		for c := 0; c<w; c++ {
+			newCell := Cell{r, c, states[r][c]}
+			row = append(row, newCell)
+		}
+		cells = append(cells, row)
+	}
+
+	game := Game{
+		Screen: s,
+		Cells: cells,
+	}
+	return game
+}
+
+func (g *Game) GliderGun() Game{
+	s := g.Screen
+	h, w := s.Size()
+	var states [][]int
+	for r := 0; r<h; r++ {
+		var row []int
+		for c := 0; c<w; c++ {
+			n := 0
+			row = append(row, n)
+		}
+		states = append(states, row)
+	}
+	states[111][26] = 1
+	states[112][27] = 1
+	states[113][26] = 1
+	states[113][27] = 1
+	states[122][26] = 1
+	states[122][27] = 1
+	states[122][28] = 1
+	states[123][25] = 1
+	states[123][29] = 1
+	states[124][24] = 1
+	states[124][30] = 1
+	states[125][24] = 1
+	states[125][30] = 1
+	states[126][27] = 1
+	states[127][25] = 1
+	states[127][29] = 1
+	states[128][26] = 1
+	states[128][27] = 1
+	states[128][28] = 1
+	states[129][27] = 1
+	states[131][24] = 1
+	states[131][25] = 1
+	states[131][26] = 1
+	states[132][24] = 1
+	states[132][25] = 1
+	states[132][26] = 1
+	states[133][23] = 1
+	states[133][27] = 1
+	states[135][22] = 1
+	states[135][23] = 1
+	states[135][27] = 1
+	states[135][28] = 1
+	states[145][24] = 1
+	states[145][25] = 1
+	states[146][24] = 1
+	states[146][25] = 1
+	
+	var cells [][]Cell
+	for r := 0; r<h; r++ {
+		var row []Cell
+		for c := 0; c<w; c++ {
+			newCell := Cell{r, c, states[r][c]}
+			row = append(row, newCell)
+		}
+		cells = append(cells, row)
+	}
+
+	game := Game{
+		Screen: s,
+		Cells: cells,
+	}
+	return game
 }

main.go

@@ -1,44 +1,68 @@
 package main
 
 import (
+	"math/rand/v2"
+	"os"
+
 	"github.com/gdamore/tcell/v2"
-	"github.com/rivo/tview"
 )
 
-func main() {
+func randNum() int {
-	app := tview.NewApplication()
+	n := rand.IntN(100)
-	
+	if n < 85 {
-	app.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		return 0
-		if event.Rune() == 'q' {
+	} else {
-			app.Stop()
+		return 1
+	}
 }
-		return event
-	})
 
-	shortcuts := tview.NewList().
+func main() {
-		AddItem("Run", "Press to run", 'r', nil).
+	// create new screen
-		AddItem("New", "Press for new init", 'n', nil).
+	s, err := tcell.NewScreen()
-		AddItem("Quit", "Press to exit", 'q', func() {
+	if err != nil {
-			app.Stop()
-		}).
-		SetSelectedFocusOnly(true)
-
-	main := tview.NewTextView().
-		SetTextAlign(tview.AlignCenter).
-		SetText(GetText())
-
-	grid := tview.NewGrid().
-		SetRows(0).
-		SetColumns(0, 30).
-		AddItem(main, 0, 0, 1, 1, 0, 0, false).
-		AddItem(shortcuts, 0, 1, 1, 1, 0, 0, true)
-
-	grid.Box = tview.NewBox().
-		SetTitle("Game of Life").
-		SetBorder(true).
-		SetBorderColor(tcell.ColorPurple)
-
-	if err := app.SetRoot(grid, true).EnableMouse(true).Run(); err != nil {
 		panic(err)
 	}
+
+	// initialise screen
+	if err := s.Init(); err != nil {
+		panic(err)
+	}
+
+	// polling to be able to quit
+	
+	style := tcell.StyleDefault.Background(tcell.ColorBlack).Foreground(tcell.ColorPurple)
+	s.SetStyle(style)
+	h, w := s.Size()
+
+	var cells [][]Cell
+	for r := 0; r<h; r++ {
+		var row []Cell
+		for c := 0; c<w; c++ {
+			newCell := Cell{r, c, randNum()}
+			row = append(row, newCell)
+		}
+		cells = append(cells, row)
+	}
+
+	game := Game{
+		Screen: s,
+		Cells: cells,
+	}
+	println("about to start")
+
+	// game = game.Glider()
+
+	for {
+		newGame := game.Run()
+		switch event := s.PollEvent().(type) {
+		case *tcell.EventResize:
+			s.Sync()
+		case *tcell.EventKey:
+			if event.Rune() == 'q' || event.Key() == tcell.KeyCtrlC {
+				s.Fini()
+				os.Exit(0)
+			}
+		}
+		game = newGame
+	}
 }