commit 495a7cce2010b54b2a0cb0a9d0a2bcb520c0f390
Author: Arek <ar@ar76.eu>
Date:   Tue Feb 11 22:30:13 2025 +0100

    Init commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f16fa55
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.vscode/**
diff --git a/bin/.gitignore b/bin/.gitignore
new file mode 100644
index 0000000..cec9082
--- /dev/null
+++ b/bin/.gitignore
@@ -0,0 +1,3 @@
+*
+
+!.gitignore
diff --git a/cmd/gol/gol.go b/cmd/gol/gol.go
new file mode 100644
index 0000000..091a6c3
--- /dev/null
+++ b/cmd/gol/gol.go
@@ -0,0 +1,54 @@
+package main
+
+import (
+	"gol/gol"
+	"gol/term"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+)
+
+func main() {
+	front := gol.New(20, 40)
+	back := gol.New(20, 40)
+
+	// glider
+	front[0][3] = true
+	front[1][4] = true
+	front[2][2] = true
+	front[2][3] = true
+	front[2][4] = true
+
+	// cross
+
+	front[16][21] = true
+	front[17][21] = true
+	front[18][21] = true
+
+	sigs := make(chan os.Signal, 1)
+	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
+
+	term.StartFullscreen()
+	term.TurnCursor(term.CursorOff)
+
+	loop := func() {
+		ticker := time.NewTicker(250 * time.Millisecond)
+		for {
+			term.GoHome()
+			front.PrintMe()
+			front.NextGen(back)
+			front, back = back, front
+			select {
+			case <-sigs: // przerwanie
+				return
+			case <-ticker.C: // upłynął czas do kolejnej generacji
+			}
+		}
+	}
+	defer func() {
+		term.FinishFullscreen()
+		term.TurnCursor(term.CursorOn)
+	}()
+	loop()
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..127e86e
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module gol
+
+go 1.19
diff --git a/gol/types.go b/gol/types.go
new file mode 100644
index 0000000..8d30793
--- /dev/null
+++ b/gol/types.go
@@ -0,0 +1,95 @@
+package gol
+
+import "fmt"
+
+type Arena [][]bool
+
+func New(ysize, xsize int) Arena {
+	var arena = make([][]bool, ysize)
+	for i := 0; i < ysize; i++ {
+		arena[i] = make([]bool, xsize)
+	}
+	return arena
+}
+
+func (a Arena) PrintMe() {
+	for i := 0; i < len(a); i++ {
+		for j := 0; j < len(a[0]); j++ {
+			if a[i][j] {
+				fmt.Print("\ue0b6\ue0b4")
+			} else {
+				//fmt.Print("\ue0b7\ue0b5")
+				fmt.Print("\u2022\u2022")
+			}
+		}
+		fmt.Println()
+	}
+}
+
+func (a Arena) NextGen(to Arena) {
+	for y := 0; y < len(a); y++ {
+		for x := 0; x < len(a[0]); x++ {
+			to[y][x] = a.Life(x, y)
+		}
+	}
+}
+
+func (a Arena) Life(x, y int) bool {
+	count := a.countN(x, y)
+	current := a[y][x]
+	if !current && count == 3 {
+		return true
+	}
+	if current && (count == 2 || count == 3) {
+		return true
+	}
+	return false
+}
+
+type pair struct {
+	x int
+	y int
+}
+
+func (a Arena) countN(x, y int) int {
+	ysize := len(a)
+	xsize := len(a[0])
+
+	xb := x - 1
+	if xb < 0 {
+		xb = xsize - 1
+	}
+	xa := x + 1
+	if xa == xsize {
+		xa = 0
+	}
+
+	yb := y - 1
+	if yb < 0 {
+		yb = ysize - 1
+	}
+
+	ya := y + 1
+	if ya == ysize {
+		ya = 0
+	}
+
+	neigh := [8]pair{
+		{xb, yb},
+		{x, yb},
+		{xa, yb},
+		{xb, y},
+		{xa, y},
+		{xb, ya},
+		{x, ya},
+		{xa, ya},
+	}
+
+	count := 0
+	for _, p := range neigh {
+		if a[p.y][p.x] {
+			count++
+		}
+	}
+	return count
+}
diff --git a/term/term.go b/term/term.go
new file mode 100644
index 0000000..969dd7d
--- /dev/null
+++ b/term/term.go
@@ -0,0 +1,57 @@
+package term
+
+import "fmt"
+
+type CursorFlag bool
+
+const (
+	CursorOn  CursorFlag = true
+	CursorOff CursorFlag = false
+)
+
+func TurnCursor(onOff CursorFlag) {
+	if onOff == CursorOn {
+		fmt.Printf("\033[?25h")
+	} else {
+		fmt.Printf("\033[?25l")
+	}
+}
+
+func ClearScreen() {
+	fmt.Printf("\033[2J")
+}
+
+func ResetTerminal() {
+	fmt.Printf("\033c")
+}
+
+func GoHome() {
+	fmt.Printf("\033[H")
+}
+
+func SaveCursor() {
+	fmt.Printf("\033[s")
+}
+
+func RestoreCursor() {
+	fmt.Printf("\033[u")
+}
+
+func EnableAlternateScreen() {
+	fmt.Printf("\033[?1049h")
+}
+
+func DisableAlternateScreen() {
+	fmt.Printf("\033[?1049l")
+}
+
+func StartFullscreen() {
+	SaveCursor()
+	EnableAlternateScreen()
+	ClearScreen()
+}
+
+func FinishFullscreen() {
+	DisableAlternateScreen()
+	RestoreCursor()
+}