Too much crap for one commit

Breaking out console runner into its own file, adding an empty web
runner, and starting to test that games and game states are able to
represent themselves as images.

conway/console.go

@@ -0,0 +1,47 @@
+package conway
+
+import (
+	"fmt"
+	"math/rand"
+	"time"
+)
+
+func init() {
+	rand.Seed(time.Now().UTC().UnixNano())
+}
+
+func RunConsoleGame(height, width, sleepMs int, mutate bool) (int, error) {
+	sleepInterval := time.Duration(sleepMs * 1000 * 1000)
+
+	game := NewGameOfLife(height, width)
+	err := game.ImportRandomState()
+	if err != nil {
+		return 2, err
+	}
+
+	genTicks, err := game.Generations()
+	if err != nil {
+		return 3, err
+	}
+
+	for genTick := range genTicks {
+		fmt.Printf("\nGeneration %v\n%v\n", genTick.N, time.Now())
+		fmt.Println(game)
+
+		if genTick.Error != nil {
+			return 4, genTick.Error
+		}
+
+		if len(genTick.Message) > 0 {
+			fmt.Println(genTick.Message)
+		}
+
+		if mutate && genTick.N%2 == 0 {
+			game.Mutate()
+		}
+
+		time.Sleep(sleepInterval)
+	}
+
+	return 0, nil
+}

conway/conway_test.go

@@ -91,7 +91,7 @@ func TestDeadCellWithExactlyThreeLiveNeighborsBecomesAlive(t *testing.T) {
 	}
 }
 
-func TestGameOfLifeCanDisplayItself(t *testing.T) {
+func TestGameOfLifeCanDisplayItselfAsAString(t *testing.T) {
 	game := newTestGameOfLife()
 
 	grid := fmt.Sprintf("%s\n", game)
@@ -103,6 +103,10 @@ func TestGameOfLifeCanDisplayItself(t *testing.T) {
 	}
 }
 
+func TestGameOfLifeCanDisplayItselfAsAnImage(t *testing.T) {
+	t.Fail()
+}
+
 func TestNewGameOfLifeHasCorrectDimensions(t *testing.T) {
 	game := newTestGameOfLife()
 
@@ -172,7 +176,7 @@ func TestGameOfLifeCanImportRandomState(t *testing.T) {
 	}
 }
 
-func TestGameStateCanDisplayItself(t *testing.T) {
+func TestGameStateCanDisplayItselfAsAString(t *testing.T) {
 	state := newTestGameState()
 
 	grid := fmt.Sprintf("%s\n", state)
@@ -190,6 +194,27 @@ func TestGameStateCanDisplayItself(t *testing.T) {
 	}
 }
 
+func TestGameStateCanDisplayItselfAsAnImage(t *testing.T) {
+	state := newTestGameState()
+
+	img, err := state.Image(1, 1)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	bounds := img.Bounds()
+	if bounds.Max.Y < 16 {
+		t.Errorf("image.Max.Y < 16!: %d", bounds.Max.Y)
+		return
+	}
+
+	if bounds.Max.X < 16 {
+		t.Errorf("image.Max.X < 16!: %d", bounds.Max.X)
+		return
+	}
+}
+
 func TestNewGameStatesAreAllDead(t *testing.T) {
 	state := NewGameState(4, 4)
 	for x := 0; x < 3; x++ {

conway/conways-game-of-life/main.go

@@ -14,6 +14,7 @@ var (
 	height  = flag.Int("height", 40, "Game height")
 	width   = flag.Int("width", 80, "Game width")
 	mutate  = flag.Bool("mutate", false, "Mutate every other generation")
+	web     = flag.Bool("web", false, "Run server for web-based game")
 	sleepMs = flag.Int("sleep.ms", 200,
 		"Millisecond sleep interval per generation")
 )
@@ -21,9 +22,21 @@ var (
 func main() {
 	flag.Parse()
 
-	retCode, err := RunConsoleGame(*height, *width, *sleepMs, *mutate)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "ERROR: %v\n", err)
+	var (
+		retCode int
+		err     error
+	)
+
+	if *web {
+		retCode, err = RunWebGame(*height, *width, *sleepMs, *mutate)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "ERROR: %v\n", err)
+		}
+	} else {
+		retCode, err = RunConsoleGame(*height, *width, *sleepMs, *mutate)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "ERROR: %v\n", err)
+		}
 	}
 
 	os.Exit(retCode)

conway/game_of_life.go

@@ -3,54 +3,14 @@ package conway
 import (
 	"errors"
 	"fmt"
+	"image"
 	"math/rand"
-	"time"
 )
 
-func init() {
-	rand.Seed(time.Now().UTC().UnixNano())
-}
-
 type GameOfLife struct {
 	State *GameState
 }
 
-func RunConsoleGame(height, width, sleepMs int, mutate bool) (int, error) {
-	sleepInterval := time.Duration(sleepMs * 1000 * 1000)
-
-	game := NewGameOfLife(height, width)
-	err := game.ImportRandomState()
-	if err != nil {
-		return 2, err
-	}
-
-	genTicks, err := game.Generations()
-	if err != nil {
-		return 3, err
-	}
-
-	for genTick := range genTicks {
-		fmt.Printf("\nGeneration %v\n%v\n", genTick.N, time.Now())
-		fmt.Println(game)
-
-		if genTick.Error != nil {
-			return 4, genTick.Error
-		}
-
-		if len(genTick.Message) > 0 {
-			fmt.Println(genTick.Message)
-		}
-
-		if mutate && genTick.N%2 == 0 {
-			game.Mutate()
-		}
-
-		time.Sleep(sleepInterval)
-	}
-
-	return 0, nil
-}
-
 func (game *GameOfLife) Mutate() {
 	game.State.Mutate()
 }
@@ -142,6 +102,10 @@ func (game *GameOfLife) String() string {
 	return fmt.Sprintf("%s\n", game.State)
 }
 
+func (game *GameOfLife) Image(xMult, yMult int) (*image.Gray16, error) {
+	return game.State.Image(xMult, yMult)
+}
+
 func (game *GameOfLife) emitGenerations(genTicks chan *GenerationTick) {
 	defer close(genTicks)
 	n := 0

conway/game_state.go

@@ -4,6 +4,7 @@ import (
 	"crypto/sha1"
 	"errors"
 	"fmt"
+	"image"
 	"math"
 	"math/rand"
 	"strings"
@@ -173,3 +174,7 @@ func (state *GameState) String() string {
 	}
 	return strings.Join(rows, "\n")
 }
+
+func (state *GameState) Image(xMult, yMult int) (*image.Gray16, error) {
+	return nil, errors.New("Not implemented!")
+}

conway/web.go

@@ -0,0 +1,14 @@
+package conway
+
+import (
+	"math/rand"
+	"time"
+)
+
+func init() {
+	rand.Seed(time.Now().UTC().UnixNano())
+}
+
+func RunWebGame(height, width, sleepMs int, mutate bool) (int, error) {
+	return -1, nil
+}