Create plugin for wrapping the handlers from ghcide

.circleci/config.yml

@@ -148,13 +148,21 @@ jobs:
             - cabal-{{ .Environment.HIE_CACHE }}-{{ arch }}-{{ .Environment.CIRCLE_JOB }}
       - run:
           name: Update
-          command: cabal update
+          command: cabal new-update
       - run:
           name: Configure
-          command: cabal configure --enable-tests
+          command: cabal new-configure --enable-tests
+      - run:
+          name: Build dependencies
+          command: cabal new-build -j1 --dependencies-only # need j1, else ghc-lib-parser triggers OOM
+          no_output_timeout: 30m
+      - save_cache:
+          key: cabal-{{ .Environment.HIE_CACHE }}-{{ arch }}-{{ .Environment.CIRCLE_JOB }}
+          paths:
+            - ~/.cabal
       - run:
           name: Build
-          command: cabal build -j1 # need j1, else ghc-lib-parser triggers OOM
+          command: cabal new-build -j1 # need j1, else ghc-lib-parser triggers OOM
           no_output_timeout: 30m
       - save_cache:
           key: cabal-{{ .Environment.HIE_CACHE }}-{{ arch }}-{{ .Environment.CIRCLE_JOB }}

exe/Main.hs

@@ -58,15 +58,20 @@ import System.Log.Logger as L
 import System.Time.Extra
 
 -- ---------------------------------------------------------------------
-
+-- ghcide partialhandlers
 import Development.IDE.Plugin.CodeAction  as CodeAction
 import Development.IDE.Plugin.Completions as Completions
+import Development.IDE.LSP.HoverDefinition as HoverDefinition
+
+ -- haskell-language-server plugins
 import Ide.Plugin.Example                 as Example
 import Ide.Plugin.Example2                as Example2
+import Ide.Plugin.GhcIde                  as GhcIde
 import Ide.Plugin.Floskell                as Floskell
 import Ide.Plugin.Ormolu                  as Ormolu
 import Ide.Plugin.Pragmas                 as Pragmas
 
+
 -- ---------------------------------------------------------------------
 
 -- | The plugins configured for use in this instance of the language
@@ -90,7 +95,8 @@ idePlugins pid includeExamples
       -- , hsimportDescriptor    "hsimport"
       -- , liquidDescriptor      "liquid"
       -- , packageDescriptor     "package"
-        Pragmas.descriptor  "pragmas"
+        GhcIde.descriptor  "ghc"
+      , Pragmas.descriptor  "pragmas"
       , Floskell.descriptor "floskell"
       -- , genericDescriptor     "generic"
       -- , ghcmodDescriptor      "ghcmod"
@@ -145,6 +151,7 @@ main = do
         -- (ps, commandIds) = idePlugins pid argsExamplePlugin
         (ps, commandIds) = idePlugins pid True
         plugins = Completions.plugin <> CodeAction.plugin <>
+                  Plugin mempty HoverDefinition.setHandlersDefinition <>
                   ps
         options = def { LSP.executeCommandCommands = Just commandIds
                       , LSP.completionTriggerCharacters = Just "."

haskell-language-server.cabal

@@ -34,6 +34,7 @@ library
       Ide.Plugin.Config
       Ide.Plugin.Example
       Ide.Plugin.Example2
+      Ide.Plugin.GhcIde
       Ide.Plugin.Ormolu
       Ide.Plugin.Pragmas
       Ide.Plugin.Floskell

src/Ide/Plugin/GhcIde.hs

@@ -0,0 +1,35 @@
+{-# LANGUAGE OverloadedStrings #-}
+module Ide.Plugin.GhcIde
+  (
+    descriptor
+  ) where
+
+import Development.IDE.Types.Logger
+import Ide.Types
+import Development.IDE.LSP.HoverDefinition
+import Development.IDE.Core.Shake
+
+-- ---------------------------------------------------------------------
+
+descriptor :: PluginId -> PluginDescriptor
+descriptor plId = PluginDescriptor
+  { pluginId = plId
+  , pluginRules = mempty
+  , pluginCommands = []
+  , pluginCodeActionProvider = Nothing
+  , pluginCodeLensProvider   = Nothing
+  , pluginDiagnosticProvider = Nothing
+  , pluginHoverProvider      = Just hover'
+  , pluginSymbolsProvider    = Nothing
+  , pluginFormattingProvider = Nothing
+  , pluginCompletionProvider = Nothing
+  }
+
+-- ---------------------------------------------------------------------
+
+hover' :: HoverProvider
+hover' ideState params = do
+    logInfo (ideLogger ideState) "GhcIde.hover entered (ideLogger)" -- AZ
+    hover ideState params
+
+-- ---------------------------------------------------------------------