Merge pull request #502 from haskell/mpj/optional-methods

Fix handling of optional methods

Author: michaelpj

lsp-types/ChangeLog.md

@@ -1,8 +1,9 @@
 # Revision history for lsp-types
 
-## 2.0.0.2
+## 2.0.1.0
 
 * Removed deprecation pragmas from fields, as these cannot currently be avoided.
+* Added `isOptionalMethod`, that checks whether a method is optional according to the spec.
 
 ## 2.0.0.1
 

lsp-types/lsp-types.cabal

@@ -1,6 +1,6 @@
 cabal-version:      3.0
 name:               lsp-types
-version:            2.0.0.2
+version:            2.0.1.0
 synopsis:
   Haskell library for the Microsoft Language Server Protocol, data types
 

lsp-types/src/Language/LSP/Protocol/Message/Method.hs

@@ -14,6 +14,7 @@ module Language.LSP.Protocol.Message.Method where
 
 import           Data.Aeson.Types
 import           Data.Function                      (on)
+import           Data.List                          (isPrefixOf)
 import           Data.GADT.Compare
 import           Data.Proxy
 import           Data.Type.Equality
@@ -29,6 +30,11 @@ import           Unsafe.Coerce
 -- SomeMethod
 ---------------
 
+-- | Is this an "optional" method which servers and clients are allowed to ignore?
+isOptionalMethod :: SomeMethod -> Bool
+-- See https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#dollarRequests
+isOptionalMethod m = "$/" `isPrefixOf` someMethodToMethodString m
+
 deriving stock instance Show SomeMethod
 instance Eq SomeMethod where
   (==) = (==) `on` someMethodToMethodString

lsp/ChangeLog.md

@@ -1,5 +1,9 @@
 # Revision history for lsp
 
+## 2.0.0.1
+
+* Fix handling of optional methods.
+
 ## 2.0.0.0
 
 * Support `lsp-types-2.0.0.0`.

lsp/lsp.cabal

@@ -1,6 +1,6 @@
 cabal-version:      2.2
 name:               lsp
-version:            2.0.0.0
+version:            2.0.0.1
 synopsis:           Haskell library for the Microsoft Language Server Protocol
 description:
   An implementation of the types, and basic message server to
@@ -63,7 +63,7 @@ library
     , filepath
     , hashable
     , lens                  >=4.15.2
-    , lsp-types             ^>=2.0
+    , lsp-types             ^>=2.0.1
     , mtl                   <2.4
     , prettyprinter
     , random

lsp/src/Language/LSP/Server/Processing.hs

@@ -404,11 +404,8 @@ handle' logger mAction m msg = do
     -- See https://microsoft.github.io/language-server-protocol/specifications/specification-current/#-notifications-and-requests.
     reportMissingHandler :: m ()
     reportMissingHandler =
-      let optional = isOptionalNotification m
+      let optional = isOptionalMethod (SomeMethod m)
       in logger <& MissingHandler optional m `WithSeverity` if optional then Warning else Error
-    isOptionalNotification (SMethod_CustomMethod p)
-      | "$/" `T.isPrefixOf` T.pack (symbolVal p) = True
-    isOptionalNotification _  = False
 
 progressCancelHandler :: (m ~ LspM config) => LogAction m (WithSeverity LspProcessingLog) -> TMessage Method_WindowWorkDoneProgressCancel -> m ()
 progressCancelHandler logger (TNotificationMessage _ _ (WorkDoneProgressCancelParams tid)) = do