From aaba06efd87df63efac68b5e9feb5102bbc1ee28 Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Tue, 17 Oct 2023 18:52:19 +0100
Subject: Cleaner, more readable code

---
 src/Game/Controller.hs | 42 ++++++++++++++++++++++--------------------
 1 file changed, 22 insertions(+), 20 deletions(-)

(limited to 'src/Game/Controller.hs')

diff --git a/src/Game/Controller.hs b/src/Game/Controller.hs
index 4d0ba81..0914766 100644
--- a/src/Game/Controller.hs
+++ b/src/Game/Controller.hs
@@ -24,26 +24,28 @@ data Controls = Controls
   deriving (Show)
 
 processControllerEvents :: Controls -> T.Toaster -> [SDL.EventPayload] -> IO (Controls, T.Toaster)
-processControllerEvents controls toaster (SDL.ControllerDeviceEvent (SDL.ControllerDeviceEventData SDL.ControllerDeviceAdded joyIndex) : t) = do
-  if isNothing controls.joyId
-    then do
-      joyName <- peekCAString =<< SDL.Raw.gameControllerNameForIndex (fromIntegral joyIndex)
-      let toaster' = T.add toaster $ "Connected " ++ show joyName
-      gc <- SDL.Raw.gameControllerOpen (fromIntegral joyIndex)
-      joy <- SDL.Raw.gameControllerGetJoystick gc
-      joyId <- SDL.Raw.joystickInstanceID joy
-      processControllerEvents controls {joyId = Just joyId, gc = Just gc} toaster' t
-    else processControllerEvents controls toaster t
-processControllerEvents controls toaster (SDL.ControllerDeviceEvent (SDL.ControllerDeviceEventData SDL.ControllerDeviceRemoved joyId) : t) = do
-  (c, toaster') <-
-    if Just joyId == controls.joyId
-      then do
-        forM_ (controls.gc) SDL.Raw.gameControllerClose
-        pure (controls {joyId = Nothing, gc = Nothing}, T.add toaster "Gamepad disconnected")
-      else pure (controls, toaster)
-  processControllerEvents c toaster' t
-processControllerEvents controls toaster (_ : t) = processControllerEvents controls toaster t
-processControllerEvents controls toaster [] = pure (controls, toaster)
+processControllerEvents controls toaster ev =
+  case ev of
+    (SDL.ControllerDeviceEvent (SDL.ControllerDeviceEventData SDL.ControllerDeviceAdded joyIndex) : t) ->
+      if isNothing controls.joyId
+        then do
+          joyName <- peekCAString =<< SDL.Raw.gameControllerNameForIndex (fromIntegral joyIndex)
+          let toaster' = T.add toaster $ "Connected " ++ show joyName
+          gc <- SDL.Raw.gameControllerOpen (fromIntegral joyIndex)
+          joy <- SDL.Raw.gameControllerGetJoystick gc
+          joyId <- SDL.Raw.joystickInstanceID joy
+          processControllerEvents controls {joyId = Just joyId, gc = Just gc} toaster' t
+        else processControllerEvents controls toaster t
+    (SDL.ControllerDeviceEvent (SDL.ControllerDeviceEventData SDL.ControllerDeviceRemoved joyId) : t) -> do
+      (c, toaster') <-
+        if Just joyId == controls.joyId
+          then do
+            forM_ controls.gc SDL.Raw.gameControllerClose
+            pure (controls {joyId = Nothing, gc = Nothing}, T.add toaster "Gamepad disconnected")
+          else pure (controls, toaster)
+      processControllerEvents c toaster' t
+    (_ : t) -> processControllerEvents controls toaster t
+    [] -> pure (controls, toaster)
 
 init :: Controls
 init = Controls False False False False False False False Nothing Nothing
-- 
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