Broke everything up into separate files to see if that's easier to manage. Looks like it'll be better.

04_combat_multifile/Makefile

@@ -0,0 +1,6 @@
+
+build:
+	go build .
+
+run:
+	./gorogue

04_combat_multifile/combat.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+  "fmt"
+  "math/rand"
+)
+
+func (game *Game) EnemyDeath() {
+  is_dead := make([]Position, 0, len(game.Enemies))
+
+  for pos, enemy := range game.Enemies {
+    if enemy.HP < 0 {
+      is_dead = append(is_dead, pos)
+    }
+  }
+
+  for _, pos := range is_dead {
+    delete(game.Enemies, pos)
+  }
+}
+
+func (game *Game) ApplyDamage(attacker *Enemy, defender *Enemy) {
+  damage := rand.Int() % attacker.Damage
+  defender.HP -= damage
+  if damage == 0 {
+    game.SetStatus("MISSED!")
+  } else if defender.HP > 0 {
+    game.SetStatus(fmt.Sprintf("HIT %d damage", damage))
+  } else {
+    game.SetStatus("DEAD!")
+  }
+}
+
+func (game *Game) Attack(target Position) {
+  enemy, hit_enemy := game.Enemies[target]
+
+  if hit_enemy {
+    game.ApplyDamage(&game.Player, enemy)
+    game.ApplyDamage(enemy, &game.Player)
+  }
+}

04_combat_multifile/data.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+  "github.com/gdamore/tcell/v2"
+)
+
+const (
+  WALL = '#'
+  SPACE = '.'
+  PATH_LIMIT = 1000
+  RENDER = true
+  SHOW_RENDER = false
+  SHOW_PATHS = false
+  HEARING_DISTANCE = 6
+)
+
+type Map [][]rune
+type Paths [][]int
+
+type Position struct {
+  X int
+  Y int
+}
+
+type Enemy struct {
+  HP int
+  Pos Position
+  Damage int
+}
+
+type Game struct {
+  Screen tcell.Screen
+  Level Map
+  Paths Paths
+  Player Enemy
+  Status string
+  Width int
+  Height int
+  Enemies map[Position]*Enemy
+}

04_combat_multifile/debug.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+  "log"
+  "os"
+  "fmt"
+  "github.com/gdamore/tcell/v2"
+)
+
+var dbg *log.Logger
+
+func DebugInit() {
+  out, err := os.Create("debug.log")
+  if err != nil { log.Fatal(err) }
+  dbg = log.New(out, "", log.LstdFlags)
+}
+
+func (game *Game) DrawPaths() {
+  for y, row := range game.Paths {
+    for x, path_num := range row {
+      if path_num == PATH_LIMIT { continue }
+
+      as_str := fmt.Sprintf("%x", path_num % 16)
+      style := tcell.StyleDefault.Foreground(tcell.ColorGray)
+
+      if path_num >= 0 && path_num <= 16 {
+        style = style.Reverse(true)
+      }
+
+      game.Screen.SetContent(x, y, rune(as_str[0]), nil, style)
+    }
+  }
+}

04_combat_multifile/game.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+  "os"
+  "math/rand"
+)
+
+func NewGame(width int, height int) (*Game) {
+  var game Game
+
+  game.Width = width
+  game.Height = height
+  game.Enemies = make(map[Position]*Enemy)
+
+  game.Level = make(Map, height, height)
+  game.Paths = make(Paths, height, height)
+
+  game.Player = Enemy{20, Position{1,1}, 4}
+
+  return &game
+}
+
+func (game *Game) Exit() {
+  if RENDER {
+    game.Screen.Fini()
+  }
+
+  os.Exit(0)
+}
+
+func (game *Game) PlaceEnemies(places []Position) {
+  for _, pos := range places {
+    if rand.Int() % 2 == 0 {
+      game.Enemies[pos] = &Enemy{10, pos, 4}
+    }
+  }
+}
+
+func (game *Game) Restart() {
+  game.SetStatus("YOU DIED! Try again.")
+  game.Player.HP = 20
+  game.Player.Pos = Position{1,1}
+  clear(game.Enemies)
+  game.FillPaths(game.Paths, PATH_LIMIT)
+  game.FillMap(game.Level, '#')
+
+  game.Render()
+}

04_combat_multifile/go.mod

@@ -0,0 +1,15 @@
+module MY/gorogue
+
+go 1.25.1
+
+require github.com/gdamore/tcell/v2 v2.9.0
+
+require (
+	github.com/gdamore/encoding v1.0.1 // indirect
+	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
+	github.com/mattn/go-runewidth v0.0.16 // indirect
+	github.com/rivo/uniseg v0.4.7 // indirect
+	golang.org/x/sys v0.35.0 // indirect
+	golang.org/x/term v0.34.0 // indirect
+	golang.org/x/text v0.28.0 // indirect
+)

04_combat_multifile/go.sum

@@ -0,0 +1,48 @@
+github.com/gdamore/encoding v1.0.1 h1:YzKZckdBL6jVt2Gc+5p82qhrGiqMdG/eNs6Wy0u3Uhw=
+github.com/gdamore/encoding v1.0.1/go.mod h1:0Z0cMFinngz9kS1QfMjCP8TY7em3bZYeeklsSDPivEo=
+github.com/gdamore/tcell/v2 v2.9.0 h1:N6t+eqK7/xwtRPwxzs1PXeRWnm0H9l02CrgJ7DLn1ys=
+github.com/gdamore/tcell/v2 v2.9.0/go.mod h1:8/ZoqM9rxzYphT9tH/9LnunhV9oPBqwS8WHGYm5nrmo=
+github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
+github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
+github.com/mattn/go-runewidth v0.0.16 h1:E5ScNMtiwvlvB5paMFdw9p4kSQzbXFikJ5SQO6TULQc=
+github.com/mattn/go-runewidth v0.0.16/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
+github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
+golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.35.0 h1:vz1N37gP5bs89s7He8XuIYXpyY0+QlsKmzipCbUtyxI=
+golang.org/x/sys v0.35.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
+golang.org/x/term v0.34.0 h1:O/2T7POpk0ZZ7MAzMeWFSg6S5IpWd/RXDlM9hgM3DR4=
+golang.org/x/term v0.34.0/go.mod h1:5jC53AEywhIVebHgPVeg0mj8OD3VO9OzclacVrqpaAw=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/text v0.28.0 h1:rhazDwis8INMIwQ4tpjLDzUhx6RlXqZNPEM0huQojng=
+golang.org/x/text v0.28.0/go.mod h1:U8nCwOR8jO/marOQ0QbDiOngZVEBB7MAiitBuMjXiNU=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

04_combat_multifile/main.go

@@ -0,0 +1,28 @@
+package main
+
+func main() {
+  DebugInit()
+
+  game := NewGame(27, 17)
+  game.InitScreen()
+
+  for {
+    game.NewMap()
+    dead_ends := game.NewMaze()
+    game.PlaceEnemies(dead_ends)
+    game.Render()
+
+    for game.HandleEvents() && game.Player.HP > 0 {
+      game.EnemyDeath()
+      game.CalculatePaths()
+      game.EnemyPathing()
+      game.Render()
+    }
+
+    if game.Player.HP <= 0 {
+      game.Restart()
+    } else {
+      game.Exit()
+    }
+  }
+}

04_combat_multifile/map.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+  "slices"
+)
+
+func compass(near Position, offset int) []Position {
+  return []Position{
+    Position{near.X, near.Y - offset},
+    Position{near.X, near.Y + offset},
+    Position{near.X + offset, near.Y},
+    Position{near.X - offset, near.Y},
+  }
+}
+
+func (game *Game) CloneMap() Map {
+  // this is a shallow copy though
+  new_map := slices.Clone(game.Level)
+
+  for i, row := range new_map {
+    // this makes sure the row is an actual copy
+    new_map[i] = slices.Clone(row)
+  }
+
+  return new_map
+}
+
+func (game *Game) Inbounds(pos Position, offset int) bool {
+  return pos.X >= offset &&
+    pos.X < game.Width - offset &&
+    pos.Y >= offset &&
+    pos.Y < game.Height - offset
+}
+
+func (game *Game) Occupied(pos Position) bool {
+  _, is_enemy := game.Enemies[pos]
+  is_player := pos == game.Player.Pos
+
+  // Inbounds comes first to prevent accessing level with bad x,y
+  return !game.Inbounds(pos, 1) ||
+      game.Level[pos.Y][pos.X] == WALL ||
+      is_enemy ||
+      is_player
+}
+
+func (game *Game) FillMap(target Map, setting rune) {
+  for y := 0 ; y < game.Height; y++ {
+    target[y] = slices.Repeat([]rune{setting}, game.Width)
+  }
+}
+
+func (game *Game) NewMap() {
+  game.FillMap(game.Level, '#')
+}

04_combat_multifile/maze.go

@@ -0,0 +1,68 @@
+package main
+
+import (
+  "math/rand"
+  "time"
+)
+
+func (game *Game) HuntNext(on *Position, found *Position) bool {
+  for y := 1; y < game.Height ; y += 2 {
+    for x := 1; x < game.Width ; x += 2 {
+      if game.Level[y][x] != WALL {
+        continue
+      }
+
+      neighbors := game.Neighbors(Position{x, y})
+
+      for _, pos := range neighbors {
+        if game.Level[pos.Y][pos.X] == SPACE {
+          *on = Position{x, y}
+          *found = pos
+          return true
+        }
+      }
+    }
+  }
+
+  return false
+}
+
+func (game *Game) HAKStep(from Position, to Position) {
+  game.Level[from.Y][from.X] = SPACE
+  row := (from.Y + to.Y) / 2
+  col := (from.X + to.X) / 2
+  game.Level[row][col] = SPACE
+}
+
+func (game *Game) NewMaze() []Position {
+  on := Position{1, 1}
+  found := Position{1,1}
+
+  dead_ends := make([]Position, 0)
+
+  for {
+    neighbors := game.NeighborWalls(on)
+
+    if len(neighbors) == 0 {
+      dead_ends = append(dead_ends, on)
+
+      if !game.HuntNext(&on, &found) {
+        break
+      }
+
+      game.HAKStep(on, found)
+    } else {
+      rand_neighbor := rand.Int() % len(neighbors)
+      nb := neighbors[rand_neighbor]
+      game.HAKStep(nb, on)
+      on = nb
+    }
+
+    if SHOW_RENDER {
+      game.Render()
+      time.Sleep(50 * time.Millisecond)
+    }
+  }
+
+  return dead_ends
+}

04_combat_multifile/movement.go

@@ -0,0 +1,23 @@
+package main
+
+
+func (game *Game) MoveEnemy(from Position, to Position) {
+  enemy, ok := game.Enemies[from]
+  if !ok { dbg.Fatal("no enemy at", from, "wtf") }
+
+  delete(game.Enemies, from)
+  game.Enemies[to] = enemy
+}
+
+func (game *Game) MovePlayer(x_delta int, y_delta int) {
+  target := Position{
+    game.Player.Pos.X + x_delta,
+    game.Player.Pos.Y + y_delta,
+  }
+
+  if game.Occupied(target) {
+    game.Attack(target)
+  } else {
+    game.Player.Pos = target
+  }
+}

04_combat_multifile/pathing.go

@@ -0,0 +1,122 @@
+package main
+
+import (
+  "slices"
+)
+
+func (game *Game) FillPaths(target Paths, setting int) {
+  for y := 0 ; y < game.Height; y++ {
+    target[y] = slices.Repeat([]int{setting}, game.Width)
+  }
+}
+
+func (game *Game) Neighbors(near Position) []Position {
+  result := make([]Position, 0, 4)
+  points := compass(near, 2)
+
+  for _, pos := range points {
+    if game.Inbounds(pos, 0) {
+      result = append(result, pos)
+    }
+  }
+
+  return result
+}
+
+func (game *Game) NeighborWalls(pos Position) []Position {
+  neighbors := game.Neighbors(pos)
+  result := make([]Position, 0)
+
+  for _, at := range neighbors {
+    cell := game.Level[at.Y][at.X]
+
+    if cell == WALL {
+      result = append(result, at)
+    }
+  }
+
+  return result
+}
+
+func (game *Game) PathAddNeighbors(neighbors []Position, closed Map, near Position) []Position {
+  points := compass(near, 1)
+
+  for _, pos := range points {
+    // NOTE: if you also add !game.Occupied(pos.x, pos.y) it ????
+    if closed[pos.Y][pos.X] == SPACE {
+      closed[pos.Y][pos.X] = WALL
+      neighbors = append(neighbors, pos)
+    }
+  }
+
+  return neighbors
+}
+
+func (game *Game) CalculatePaths() {
+  in_grid := make([][]int, game.Height, game.Height)
+  game.FillPaths(in_grid, 1)
+  in_grid[game.Player.Pos.Y][game.Player.Pos.X] = 0
+
+  game.FillPaths(game.Paths, PATH_LIMIT)
+  closed := game.CloneMap()
+  starting_pixels := make([]Position, 0, 10)
+  open_pixels := make([]Position, 0, 10)
+
+  counter := 0
+
+  for counter < game.Height * game.Width {
+    x := counter % game.Width
+    y := counter / game.Width
+
+    if in_grid[y][x] == 0 {
+      game.Paths[y][x] = 0
+      closed[y][x] = WALL
+      starting_pixels = append(starting_pixels, Position{x, y})
+    }
+
+    counter += 1
+  }
+
+  for _, pos := range starting_pixels {
+    open_pixels = game.PathAddNeighbors(open_pixels, closed, pos)
+  }
+
+  counter = 1
+  for counter < PATH_LIMIT && len(open_pixels) > 0 {
+    next_open := make([]Position, 0, 10)
+    for _, pos := range open_pixels {
+      game.Paths[pos.Y][pos.X] = counter
+      next_open = game.PathAddNeighbors(next_open, closed, pos)
+    }
+    open_pixels = next_open
+    counter += 1
+  }
+
+  for _, pos := range open_pixels {
+    game.Paths[pos.Y][pos.X] = counter
+  }
+}
+
+func (game *Game) EnemyPathing() {
+  for enemy_at, _ := range game.Enemies {
+    // get the four directions
+    dirs := compass(enemy_at, 1)
+
+    // sort by closest path number
+    slices.SortFunc(dirs, func(a Position, b Position) int {
+      return game.Paths[a.Y][a.X] - game.Paths[b.Y][b.X]
+    })
+
+    // 0 dir is now the best direction
+    move_to := dirs[0]
+
+    // can we hear the player? occupied?
+    can_hear := game.Paths[move_to.Y][move_to.X] < HEARING_DISTANCE
+    occupied := game.Occupied(move_to)
+
+    if can_hear && !occupied {
+      // move the enemy in the best direction
+      game.MoveEnemy(enemy_at, move_to)
+    }
+  }
+}

04_combat_multifile/ui.go

@@ -0,0 +1,122 @@
+package main
+
+import (
+  "log"
+  "fmt"
+  "github.com/gdamore/tcell/v2"
+  "github.com/gdamore/tcell/v2/encoding"
+)
+
+//// DRAWING
+
+func (game *Game) DrawText(x int, y int, text string) {
+  for i, cell := range text {
+    game.Screen.SetContent(x+i, y, cell, nil, tcell.StyleDefault)
+  }
+}
+
+func (game *Game) DrawStatus() {
+  game.DrawText(0, game.Height, game.Status)
+
+  hp := fmt.Sprintf("HP: %d", game.Player.HP)
+
+  game.DrawText(game.Width - len(hp), game.Height, hp)
+}
+
+func (game *Game) SetStatus(msg string) {
+  game.Status = msg
+}
+
+func (game *Game) DrawEntity(symbol rune, pos Position, color tcell.Color) {
+  style := tcell.StyleDefault.Bold(true).Foreground(color)
+  game.Screen.SetContent(pos.X, pos.Y, symbol, nil, style)
+}
+
+func (game *Game) DrawMap() {
+  gray := tcell.StyleDefault.Foreground(tcell.ColorGray)
+
+  for y, line := range game.Level {
+    for x, cell := range line {
+      if cell == SPACE {
+        game.Screen.SetContent(x, y, cell, nil, gray)
+      } else {
+        game.Screen.SetContent(x, y, cell, nil, tcell.StyleDefault)
+      }
+    }
+  }
+}
+
+///// RENDERING
+
+func (game *Game) InitScreen() {
+  var err error
+  encoding.Register()
+
+  game.Screen, err = tcell.NewScreen()
+
+  // using log.Fatal instead of dbg.Fatal
+  // because the screen isn't setup yet
+  if err != nil { log.Fatal(err) }
+
+  err = game.Screen.Init()
+  if err != nil { log.Fatal(err) }
+}
+
+func (game *Game) Render() {
+  if !RENDER { return }
+
+  game.Screen.Clear()
+
+  game.DrawMap()
+
+  if SHOW_PATHS {
+    game.DrawPaths()
+  }
+
+  game.DrawEntity('@', game.Player.Pos, tcell.ColorYellow)
+
+  for pos, _ := range game.Enemies {
+    game.DrawEntity('G', pos, tcell.ColorRed)
+  }
+
+  game.DrawStatus()
+
+  game.Screen.Show()
+}
+
+//// EVENTS
+
+func (game *Game) HandleKeys(ev *tcell.EventKey) bool {
+  switch ev.Key() {
+  case tcell.KeyEscape:
+    return false
+  case tcell.KeyUp:
+    game.MovePlayer(0, -1)
+  case tcell.KeyDown:
+    game.MovePlayer(0, 1)
+  case tcell.KeyRight:
+    game.MovePlayer(1, 0)
+  case tcell.KeyLeft:
+    game.MovePlayer(-1, 0)
+  }
+
+  switch ev.Rune() {
+  case 'q':
+    return false
+  }
+
+  return true
+}
+
+func (game *Game) HandleEvents() bool {
+  if !RENDER { return false }
+
+  switch ev := game.Screen.PollEvent().(type) {
+  case *tcell.EventResize:
+    game.Screen.Sync()
+  case *tcell.EventKey:
+    return game.HandleKeys(ev)
+  }
+
+  return true
+}