import Data.Aeson
import qualified Data.ByteString.Lazy.Char8 as B
import Data.Conduit.Parser
-import Data.Maybe
-import qualified Data.Text as T
import Data.Typeable
import Language.Haskell.LSP.Messages
import Language.Haskell.LSP.Types
--
-- @since 0.5.2.0
satisfy :: (FromServerMessage -> Bool) -> Session FromServerMessage
-satisfy pred = do
+satisfy pred = satisfyMaybe (\msg -> if pred msg then Just msg else Nothing)
+
+-- | Consumes and returns the result of the specified predicate if it returns `Just`.
+--
+-- @since 0.6.1.0
+satisfyMaybe :: (FromServerMessage -> Maybe a) -> Session a
+satisfyMaybe pred = do
skipTimeout <- overridingTimeout <$> get
timeoutId <- curTimeoutId <$> get
threadDelay (timeout * 1000000)
writeChan chan (TimeoutMessage timeoutId)
- x <- await
+ x <- Session await
unless skipTimeout $
modify $ \s -> s { curTimeoutId = timeoutId + 1 }
modify $ \s -> s { lastReceivedMessage = Just x }
- if pred x
- then do
+ case pred x of
+ Just a -> do
logMsg LogServer x
- return x
- else empty
+ return a
+ Nothing -> empty
-- | Matches a message of type @a@.
message :: forall a. (Typeable a, FromJSON a) => Session a
message =
let parser = decode . encodeMsg :: FromServerMessage -> Maybe a
- in named (T.pack $ show $ head $ snd $ splitTyConApp $ last $ typeRepArgs $ typeOf parser) $
- castMsg <$> satisfy (isJust . parser)
+ in satisfyMaybe parser
-- | Matches if the message is a notification.
anyNotification :: Session FromServerMessage
-anyNotification = named "Any notification" $ satisfy isServerNotification
+anyNotification = satisfy isServerNotification
-- | Matches if the message is a request.
anyRequest :: Session FromServerMessage
-anyRequest = named "Any request" $ satisfy isServerRequest
+anyRequest = satisfy isServerRequest
-- | Matches if the message is a response.
anyResponse :: Session FromServerMessage
-anyResponse = named "Any response" $ satisfy isServerResponse
+anyResponse = satisfy isServerResponse
-- | Matches a response for a specific id.
responseForId :: forall a. FromJSON a => LspId -> Session (ResponseMessage a)
-responseForId lid = named (T.pack $ "Response for id: " ++ show lid) $ do
+responseForId lid = do
let parser = decode . encodeMsg :: FromServerMessage -> Maybe (ResponseMessage a)
- x <- satisfy (maybe False (\z -> z ^. LSP.id == responseId lid) . parser)
- return $ castMsg x
+ satisfyMaybe $ \msg -> do
+ z <- parser msg
+ guard (z ^. LSP.id == responseId lid)
+ pure z
-- | Matches any type of message.
anyMessage :: Session FromServerMessage
anyMessage = satisfy (const True)
--- | A stupid method for getting out the inner message.
-castMsg :: FromJSON a => FromServerMessage -> a
-castMsg = fromMaybe (error "Failed casting a message") . decode . encodeMsg
-
-- | A version of encode that encodes FromServerMessages as if they
-- weren't wrapped.
encodeMsg :: FromServerMessage -> B.ByteString
-- | Matches if the message is a log message notification or a show message notification/request.
loggingNotification :: Session FromServerMessage
-loggingNotification = named "Logging notification" $ satisfy shouldSkip
+loggingNotification = satisfy shouldSkip
where
shouldSkip (NotLogMessage _) = True
shouldSkip (NotShowMessage _) = True
-- | Matches a 'Language.Haskell.LSP.Test.PublishDiagnosticsNotification'
-- (textDocument/publishDiagnostics) notification.
publishDiagnosticsNotification :: Session PublishDiagnosticsNotification
-publishDiagnosticsNotification = named "Publish diagnostics notification" $ do
- NotPublishDiagnostics diags <- satisfy test
- return diags
- where test (NotPublishDiagnostics _) = True
- test _ = False
+publishDiagnosticsNotification = satisfyMaybe $
+ \msg -> case msg of
+ NotPublishDiagnostics diags -> Just diags
+ _ -> Nothing