fix yesod devel

yesod/Scaffold/Devel.hs

@@ -83,11 +83,11 @@ devel cabalCmd = do
                 , concat
                     [ "import \""
                     , pi'
-                    , "\" Application (withDevelAppPort)"
+                    , "\" Application (withDevelApp)"
                     ]
                 , "import Data.Dynamic (fromDynamic)"
                 , "import Network.Wai.Handler.Warp (run)"
-                , "import Network.Wai.Middleware.Debug (debug)"
+                , "import Network.Wai.Middleware.Debug (debugHandle)"
                 , "import Data.Maybe (fromJust)"
                 , "import Control.Concurrent (forkIO)"
                 , "import System.Directory (doesFileExist, removeFile)"
@@ -97,7 +97,7 @@ devel cabalCmd = do
                 , "main = do"
                 , "    putStrLn \"Starting app\""
                 , "    wdap <- return $ fromJust $ fromDynamic withDevelAppPort"
-                , "    forkIO $ wdap $ \\(port, app) -> run port app"
+                , "    forkIO $ wdap $ \\(port, debugLogHandle app) -> (run port . debugHandle debugLogHandle) app"
                 , "    loop"
                 , ""
                 , "loop :: IO ()"

yesod/scaffold/Application.hs.cg

@@ -68,8 +68,8 @@ with~sitearg~ conf logger f = do
 #endif
 
 -- for yesod devel
-withDevelAppPort :: Dynamic
-withDevelAppPort =
+withDevelApp :: Dynamic
+withDevelApp =
     toDyn go
   where
     go :: ((Int, Application) -> IO ()) -> IO ()

yesod/scaffold/tiny/Application.hs.cg

@@ -46,16 +46,18 @@ with~sitearg~ conf logger f = do
     s = staticDevel Settings.staticDir
 #endif
 
-with~sitearg~LoadConfig :: Settings.AppEnvironment -> (Application -> IO a) -> IO a
-with~sitearg~LoadConfig env f = do
-  conf <- Settings.loadConfig env
-  logger <- makeLogger
-  r <- with~sitearg~ conf logger f
-  flushLogger logger
-  return r
-
-
+-- for yesod devel
 withDevelApp :: Dynamic
-withDevelApp = do
-  toDyn ((with~sitearg~LoadConfig Settings.Development):: (Application -> IO ()) -> IO ())
-
+withDevelApp =
+    toDyn go
+  where
+    go :: ((Int, Application) -> IO ()) -> IO ()
+    go f = do
+        conf <- Settings.loadConfig Settings.Development
+        let port = appPort conf
+        logger <- makeLogger
+        logString logger $ "Devel application launched, listening on port " ++ show port
+        with~sitearg~ conf logger $ \app -> f (port, debugHandle (logHandle logger) app)
+        flushLogger logger
+      where
+        logHandle logger msg = logLazyText logger msg >> flushLogger logger