Use the LSP provided root directory to find the cradle

When checking for GHC version.  This also removes the redundant check in
MainHie (I'm not sure why were checking twice). This will remove the
check for the JSON transport, but as far as I am aware this is
unmantained anyway.

app/MainHie.hs

@@ -111,22 +111,13 @@ run opts = do
 
   Core.setupLogger mLogFileName ["hie", "hie-bios"] logLevel
 
-  d <- getCurrentDirectory
-  -- Get the cabal directory from the cradle
-  cradle <- findLocalCradle (d </> "File.hs")
-
-  projGhcVersion <- getProjectGhcVersion cradle
-  when (projGhcVersion /= hieGhcVersion) $
-    warningm $ "Mismatching GHC versions: Project is " ++ projGhcVersion
-            ++ ", HIE is " ++ hieGhcVersion
-
   origDir <- getCurrentDirectory
 
   maybe (pure ()) setCurrentDirectory $ projectRoot opts
 
   progName <- getProgName
   logm $  "Run entered for HIE(" ++ progName ++ ") " ++ version
-  logm $ "Current directory:" ++ d
+  logm $ "Current directory:" ++ origDir
   args <- getArgs
   logm $ "args:" ++ show args
 

src/Haskell/Ide/Engine/Transport/LspStdio.hs

@@ -420,8 +420,10 @@ reactor inp diagIn = do
           reactorSend $ NotLogMessage $
                   fmServerLogMessageNotification J.MtLog $ "Using hie version: " <> T.pack version
 
-          d <- liftIO getCurrentDirectory
-          cradle <- liftIO $ findLocalCradle (d </> "File.hs")
+          lspRootDir <- asksLspFuncs Core.rootPath
+          currentDir <- liftIO getCurrentDirectory
+
+          cradle <- liftIO $ findLocalCradle ((fromMaybe currentDir lspRootDir) </> "File.hs")
           -- Check for mismatching GHC versions
           projGhcVersion <- liftIO $ getProjectGhcVersion cradle
           when (projGhcVersion /= hieGhcVersion) $ do
@@ -437,13 +439,12 @@ reactor inp diagIn = do
             reactorSend $ NotShowMessage $ fmServerShowMessageNotification J.MtWarning msg
             reactorSend $ NotLogMessage $ fmServerLogMessageNotification J.MtWarning msg
 
-
-          lf <- ask
+          renv <- ask
           let hreq = GReq tn Nothing Nothing Nothing callback Nothing $ IdeResultOk <$> Hoogle.initializeHoogleDb
-              callback Nothing = flip runReaderT lf $
+              callback Nothing = flip runReaderT renv $
                 reactorSend $ NotShowMessage $
                   fmServerShowMessageNotification J.MtWarning "No hoogle db found. Check the README for instructions to generate one"
-              callback (Just db) = flip runReaderT lf $ do
+              callback (Just db) = flip runReaderT renv $ do
                 reactorSend $ NotLogMessage $
                   fmServerLogMessageNotification J.MtLog $ "Using hoogle db at: " <> T.pack db
           makeRequest hreq