Warn if TH and Mac and static binary

cabal-ghc901.project

@@ -37,7 +37,7 @@ package *
 
 write-ghc-environment-files: never
 
-index-state: 2021-11-29T08:11:07Z
+index-state: 2021-11-29T12:30:07Z
 
 constraints:
   -- These plugins don't work on GHC9 yet

cabal-ghc921.project

@@ -36,7 +36,7 @@ package *
 
 write-ghc-environment-files: never
 
-index-state: 2021-11-29T08:11:07Z
+index-state: 2021-11-29T12:30:07Z
 
 constraints:
   -- These plugins doesn't work on GHC92 yet

cabal.project

@@ -40,7 +40,7 @@ package *
 
 write-ghc-environment-files: never
 
-index-state: 2021-11-29T08:11:07Z
+index-state: 2021-11-29T12:30:07Z
 
 constraints:
     hyphenation +embed

docs/troubleshooting.md

@@ -36,15 +36,11 @@ An usual symptom is the presence of errors containing `unknown symbol` and it is
 
 The workaround is to use a version of haskell-language-server compiled from source with the ghc option `-dynamic` enabled. See more details [here](https://github.com/haskell/haskell-language-server/issues/1160#issuecomment-756566273).
 
-### Problems with Template Haskell
+### Support for Template Haskell
 
-Due to how Template Haskell code is evaluated at compile time and some limitations in the interaction between HLS and GHC, the loading of modules using TH can be problematic.
+Template Haskell should work fine in Linux and Windows with the distributed binaries. In Mac Os a dynamically linked binary of HLS is required to avoid segmentation faults. The easiest way to obtain a dynamically linked HLS binary is to build it locally. With cabal install this can be done as follows:
 
-The errors thrown are usually related to linking and usually make HLS crash: `Segmentation fault`, `GHC runtime linker: fatal error`, etc
-
-A workaround which has helped in some cases is to compile HLS from source with the ghc option `-dynamic` enabled, as in the previous issue.
-
-We have a [dedicated label](https://github.com/haskell/haskell-language-server/issues?q=is%3Aissue+is%3Aopen+label%3A%22type%3A+template+haskell+related%22) in the issue tracker and an [general issue](https://github.com/haskell/haskell-language-server/issues/1431) tracking support for TH.
+    cabal update && cabal install haskell-language-server --enable-executable-dynamic
 
 ## Troubleshooting the server
 

ghcide/ghcide.cabal

@@ -106,7 +106,7 @@ library
         ghc-check >=0.5.0.4,
         ghc-paths,
         cryptohash-sha1 >=0.11.100 && <0.12,
-        hie-bios >= 0.7.1 && < 0.9.0,
+        hie-bios >= 0.8 && < 0.9.0,
         implicit-hie-cradle >= 0.3.0.5 && < 0.4,
         base16-bytestring >=0.1.1 && <1.1
     if os(windows)

ghcide/src/Development/IDE/Core/Rules.hs

@@ -136,7 +136,7 @@ import qualified GHC.LanguageExtensions                       as LangExt
 import qualified HieDb
 import           Ide.Plugin.Config
 import qualified Language.LSP.Server                          as LSP
-import           Language.LSP.Types                           (SMethod (SCustomMethod))
+import           Language.LSP.Types                           (SMethod (SCustomMethod, SWindowShowMessage), ShowMessageParams (ShowMessageParams), MessageType (MtInfo))
 import           Language.LSP.VFS
 import           System.Directory                             (makeAbsolute)
 import           Data.Default                                 (def, Default)
@@ -149,6 +149,15 @@ import           Ide.PluginUtils                              (configForPlugin)
 import           Ide.Types                                    (DynFlagsModifications (dynFlagsModifyGlobal, dynFlagsModifyParser),
                                                                PluginId)
 import Control.Concurrent.STM.Stats (atomically)
+import Language.LSP.Server (LspT)
+import System.Environment (getExecutablePath)
+import System.Process.Extra (readProcessWithExitCode)
+import Text.Read (readMaybe)
+import System.Info.Extra (isMac)
+import HIE.Bios.Ghc.Gap (hostIsDynamic)
+
+templateHaskellInstructions :: T.Text
+templateHaskellInstructions = "https://haskell-language-server.readthedocs.io/en/latest/troubleshooting.html#support-for-template-haskell"
 
 -- | This is useful for rules to convert rules that can only produce errors or
 -- a result into the more general IdeResult type that supports producing
@@ -820,8 +829,26 @@ isHiFileStableRule = defineEarlyCutoff $ RuleNoDiagnostics $ \IsHiFileStable f -
       summarize SourceUnmodified          = BS.singleton 2
       summarize SourceUnmodifiedAndStable = BS.singleton 3
 
+displayTHWarning :: LspT c IO ()
+displayTHWarning
+  | isMac && not hostIsDynamic = do
+      LSP.sendNotification SWindowShowMessage $
+        ShowMessageParams MtInfo $ T.unwords
+          [ "This HLS binary does not support Template Haskell."
+          , "Follow the [instructions](" <> templateHaskellInstructions <> ")"
+          , "to build an HLS binary with support for Template Haskell."
+          ]
+  | otherwise = return ()
+
+newtype DisplayTHWarning = DisplayTHWarning (IO ())
+instance IsIdeGlobal DisplayTHWarning
+
 getModSummaryRule :: Rules ()
 getModSummaryRule = do
+    env <- lspEnv <$> getShakeExtrasRules
+    displayItOnce <- liftIO $ once $ LSP.runLspT (fromJust env) displayTHWarning
+    addIdeGlobal (DisplayTHWarning displayItOnce)
+
     defineEarlyCutoff $ Rule $ \GetModSummary f -> do
         session' <- hscEnv <$> use_ GhcSession f
         modify_dflags <- getModifyDynFlags dynFlagsModifyGlobal
@@ -832,6 +859,10 @@ getModSummaryRule = do
                 getModSummaryFromImports session fp modTime (textToStringBuffer <$> mFileContent)
         case modS of
             Right res -> do
+                -- Check for Template Haskell
+                when (uses_th_qq $ msrModSummary res) $ do
+                    DisplayTHWarning act <- getIdeGlobalAction
+                    liftIO act
                 bufFingerPrint <- liftIO $
                     fingerprintFromStringBuffer $ fromJust $ ms_hspp_buf $ msrModSummary res
                 let fingerPrint = Util.fingerprintFingerprints
@@ -1027,9 +1058,6 @@ needsCompilationRule file = do
 
   pure (Just $ encodeLinkableType res, Just res)
   where
-    uses_th_qq (ms_hspp_opts -> dflags) =
-      xopt LangExt.TemplateHaskell dflags || xopt LangExt.QuasiQuotes dflags
-
     computeLinkableType :: ModSummary -> [Maybe ModSummary] -> [Maybe LinkableType] -> Maybe LinkableType
     computeLinkableType this deps xs
       | Just ObjectLinkable `elem` xs     = Just ObjectLinkable -- If any dependent needs object code, so do we
@@ -1039,6 +1067,10 @@ needsCompilationRule file = do
       where
         this_type = computeLinkableTypeForDynFlags (ms_hspp_opts this)
 
+uses_th_qq :: ModSummary -> Bool
+uses_th_qq (ms_hspp_opts -> dflags) =
+      xopt LangExt.TemplateHaskell dflags || xopt LangExt.QuasiQuotes dflags
+
 -- | How should we compile this module?
 -- (assuming we do in fact need to compile it).
 -- Depends on whether it uses unboxed tuples or sums

stack-8.10.6.yaml

@@ -37,6 +37,7 @@ extra-deps:
   - data-tree-print-0.1.0.2@sha256:d845e99f322df70e0c06d6743bf80336f5918d5423498528beb0593a2afc1703,1620
   - floskell-0.10.5@sha256:77f0bc1569573d9666b10975a5357fef631d32266c071733739393ccae521dab,3803
   - heapsize-0.3.0.1@sha256:0b69aa97a46d819b700ac7b145f3b5493c3565cf2c5b8298682238d405d0326e,1417
+  - hie-bios-0.8.0
   - hiedb-0.4.1.0
   - implicit-hie-0.1.2.6@sha256:f50a908979a574a881f753c0f9a5224f023f438b30fdefc5b7fa01803b07a280,2998
   - implicit-hie-cradle-0.3.0.5@sha256:5f5e575f549b2a9db664be7650b5c3c9226e313bddc46c79e2e83eb349f8e692,2610

stack-8.10.7.yaml

@@ -37,6 +37,7 @@ extra-deps:
   - data-tree-print-0.1.0.2@sha256:d845e99f322df70e0c06d6743bf80336f5918d5423498528beb0593a2afc1703,1620
   - floskell-0.10.5@sha256:77f0bc1569573d9666b10975a5357fef631d32266c071733739393ccae521dab,3803
   - heapsize-0.3.0.1@sha256:0b69aa97a46d819b700ac7b145f3b5493c3565cf2c5b8298682238d405d0326e,1417
+  - hie-bios-0.8.0
   - hiedb-0.4.1.0
   - implicit-hie-0.1.2.6@sha256:f50a908979a574a881f753c0f9a5224f023f438b30fdefc5b7fa01803b07a280,2998
   - implicit-hie-cradle-0.3.0.5@sha256:5f5e575f549b2a9db664be7650b5c3c9226e313bddc46c79e2e83eb349f8e692,2610

stack-8.6.5.yaml

@@ -60,7 +60,7 @@ extra-deps:
   - haddock-library-1.10.0
   - hashable-1.3.0.0
   - heapsize-0.3.0
-  - hie-bios-0.7.5
+  - hie-bios-0.8.0
   - hlint-3.2.3
   - HsYAML-0.2.1.0@rev:1
   - HsYAML-aeson-0.2.0.0@rev:2

stack-8.8.4.yaml

@@ -50,7 +50,7 @@ extra-deps:
   - ghc-trace-events-0.1.2.1
   - haskell-src-exts-1.21.1
   - heapsize-0.3.0
-  - hie-bios-0.7.5
+  - hie-bios-0.8.0
   - hlint-3.2.3
   - HsYAML-aeson-0.2.0.0@rev:2
   - hoogle-5.0.17.11

stack.yaml

@@ -37,6 +37,7 @@ extra-deps:
   - data-tree-print-0.1.0.2@sha256:d845e99f322df70e0c06d6743bf80336f5918d5423498528beb0593a2afc1703,1620
   - floskell-0.10.5@sha256:77f0bc1569573d9666b10975a5357fef631d32266c071733739393ccae521dab,3803
   - heapsize-0.3.0.1@sha256:0b69aa97a46d819b700ac7b145f3b5493c3565cf2c5b8298682238d405d0326e,1417
+  - hie-bios-0.8.0
   - hiedb-0.4.1.0
   - implicit-hie-0.1.2.6@sha256:f50a908979a574a881f753c0f9a5224f023f438b30fdefc5b7fa01803b07a280,2998
   - implicit-hie-cradle-0.3.0.5@sha256:5f5e575f549b2a9db664be7650b5c3c9226e313bddc46c79e2e83eb349f8e692,2610