when play button is focused on title screen and either attack or jump button is pressed, start level

fcore/frame-input-type.sml

@@ -0,0 +1,11 @@
+structure FrameInputType =
+struct
+  type t =
+    { leftHeld: bool
+    , rightHeld: bool
+    , upHeld: bool
+    , downHeld: bool
+    , attackHeld: bool
+    , jumpHeld: bool
+    }
+end

fcore/game-update.sml

@@ -5,18 +5,9 @@ struct
   fun update (game: GameType.game_type, input) =
     let
       val {mode, userKeys} = game
-
-      val mode =
-        case mode of
-          LEVEL level =>
-            let val level = LevelUpdate.update (level, input)
-            in LEVEL level
-            end
-        | TITLE title =>
-            let val title = TitleUpdate.update (title, input)
-            in TITLE title
-            end
     in
-      {mode = mode, userKeys = userKeys}
+      case mode of
+        LEVEL level => LevelUpdate.update (level, input, userKeys)
+      | TITLE title => TitleUpdate.update (title, input, userKeys)
     end
 end

fcore/level/level-update.sml

@@ -1,6 +1,6 @@
 structure LevelUpdate =
 struct
-  fun update (level, input) =
+  fun update (level, input, userKeys) =
     let
       val
         { player
@@ -30,15 +30,18 @@ struct
         (enemies, walls, wallTree, platforms, platformTree, player, graph)
 
       val fallingEnemies = FallingEnemies.update fallingEnemies
+
+      val mode =
+        { player = player
+        , walls = walls
+        , wallTree = wallTree
+        , platforms = platforms
+        , platformTree = platformTree
+        , enemies = enemies
+        , graph = graph
+        , fallingEnemies = fallingEnemies
+        }
     in
-      { player = player
-      , walls = walls
-      , wallTree = wallTree
-      , platforms = platforms
-      , platformTree = platformTree
-      , enemies = enemies
-      , graph = graph
-      , fallingEnemies = fallingEnemies
-      }
+      {mode = GameType.LEVEL mode, userKeys = userKeys}
     end
 end

fcore/title/title-update.sml

@@ -2,5 +2,16 @@ structure TitleUpdate =
 struct
   open TitleType
 
-  fun update (titleState, input) = titleState
+  fun update (titleState, input: FrameInputType.t, userKeys) =
+    case #focus titleState of
+      START_BUTTON =>
+        let
+          val mode =
+            if #attackHeld input orelse #jumpHeld input then
+              GameType.LEVEL LevelType.initial
+            else
+              GameType.TITLE titleState
+        in
+          {mode = mode, userKeys = userKeys}
+        end
 end

fcore/title/title-vec.sml

@@ -3,7 +3,19 @@ struct
   open TitleType
 
   fun helpGetTextVec
-    (x, y, fontSize, fontSpace, windowWidth, windowHeight, pos, str, acc, r, g, b) =
+    ( x
+    , y
+    , fontSize
+    , fontSpace
+    , windowWidth
+    , windowHeight
+    , pos
+    , str
+    , acc
+    , r
+    , g
+    , b
+    ) =
     if pos = String.size str then
       Vector.concat acc
     else
@@ -31,15 +43,12 @@ struct
           )
       end
 
-  fun getTextWidth text =
-    String.size text * Constants.fontSpace
+  fun getTextWidth text = String.size text * Constants.fontSpace
 
   (* x coordinate that will let us place this text on centre of screen *)
   fun getTextCentreX text =
-    let
-      val textWidth = getTextWidth text
-    in
-      (Constants.worldWidth - textWidth) div 2
+    let val textWidth = getTextWidth text
+    in (Constants.worldWidth - textWidth) div 2
     end
 
   fun getTextVec (x, y, width, height, str, r, g, b) =
@@ -66,7 +75,8 @@ struct
           val fontSpace = Real32.fromInt Constants.fontSpace * wratio
           val fontSpace = Real32.toInt IEEEReal.TO_NEAREST fontSpace
         in
-          helpGetTextVec (x, y, fontSize, fontSpace, width, height, 0, str, [], r, g, b)
+          helpGetTextVec
+            (x, y, fontSize, fontSpace, width, height, 0, str, [], r, g, b)
         end
       else
         let
@@ -87,16 +97,15 @@ struct
           val fontSpace = Real32.fromInt Constants.fontSpace * hratio
           val fontSpace = Real32.toInt IEEEReal.TO_NEAREST fontSpace
         in
-          helpGetTextVec (x, y, fontSize, fontSpace, width, height, 0, str, [], r, g, b)
+          helpGetTextVec
+            (x, y, fontSize, fontSpace, width, height, 0, str, [], r, g, b)
         end
     end
 
   fun getDrawVec (title: TitleType.title_type, width, height) =
     case #focus title of
       START_BUTTON =>
-        let
-          val playX = getTextCentreX "Play game"
-        in
-          getTextVec (playX, 500, width, height, "Play game", 0.0, 0.0, 0.0)
+        let val playX = getTextCentreX "Play game"
+        in getTextVec (playX, 500, width, height, "Play game", 0.0, 0.0, 0.0)
         end
 end