Create setup script for Windows SDL as cabal flags don't support rela…

…tive paths

HaskellGameJamTemplate.cabal

@@ -31,7 +31,7 @@ maintainer:         changeme@ed.ac.uk
 -- copyright:
 
 category:           Game
-build-type:         Simple
+build-type:     Custom
 
 executable Game
     ghc-options:      -Wall

Setup.hs

@@ -0,0 +1,49 @@
+import Distribution.PackageDescription
+    ( GenericPackageDescription
+    , HookedBuildInfo
+    , extraLibDirs
+    , includeDirs
+    , libBuildInfo
+    , library
+    )
+import Distribution.Simple
+    ( Args
+    , UserHooks
+    , confHook
+    , defaultMainWithHooks
+    , simpleUserHooks
+    )
+import Distribution.Simple.LocalBuildInfo
+    ( LocalBuildInfo
+    , localPkgDescr
+    )
+import Distribution.Simple.Setup
+    ( ConfigFlags
+    )
+import Data.Maybe
+    ( fromJust
+    )
+import System.Directory
+    ( getCurrentDirectory
+    )
+
+main :: IO ()
+main = defaultMainWithHooks simpleUserHooks { confHook = sdlConfHook }
+
+sdlConfHook :: (GenericPackageDescription, HookedBuildInfo) -> ConfigFlags -> IO LocalBuildInfo
+sdlConfHook (description, buildInfo) flags = do
+    localBuildInfo <- confHook simpleUserHooks (description, buildInfo) flags
+    let packageDescription = localPkgDescr localBuildInfo
+        library = fromJust $ library packageDescription
+        libraryBuildInfo = libBuildInfo library
+    dir <- getCurrentDirectory
+    return localBuildInfo {
+        localPkgDescr = packageDescription {
+            library = Just $ library {
+                libBuildInfo = libraryBuildInfo {
+                    includeDirs = (dir ++ "/sdl/include"):(includeDirs libraryBuildInfo),
+                    extraLibDirs = (dir ++ "/sdl/lib"):(extraLibDirs libraryBuildInfo)
+                }
+            }
+        }
+    }

cabal.project

@@ -8,8 +8,6 @@ if os(windows)
         -- is found in the system package manager.
         -- On Linux, run: apt-get install libsdl2-dev
         -- On OSX, run: brew install sdl2
-        extra-include-dirs: sdl/include
-        extra-lib-dirs: sdl/lib
 
     package text
         -- Disable use of SIMD, which makes text fails to build on Win + GHC 8.8.4