Expose codeAction and codeLens providers for haskell-language-server (#499)

* Expose codeAction and codeLens providers for haskell-language-server

Also tweak the code action reply type to generate well-formed JSON

* Expose moduleOutline for symbolProvider in hls too

* Revert to using [CAResult] rather than List CAResult

Author: alanz

ghcide.cabal

@@ -114,6 +114,7 @@ library
         Development.IDE.Import.DependencyInformation
         Development.IDE.LSP.HoverDefinition
         Development.IDE.LSP.LanguageServer
+        Development.IDE.LSP.Outline
         Development.IDE.LSP.Protocol
         Development.IDE.LSP.Server
         Development.IDE.Spans.Common
@@ -134,7 +135,6 @@ library
         Development.IDE.GHC.Warnings
         Development.IDE.Import.FindImports
         Development.IDE.LSP.Notifications
-        Development.IDE.LSP.Outline
         Development.IDE.Spans.AtPoint
         Development.IDE.Spans.Calculate
         Development.IDE.Spans.Documentation

src/Development/IDE/LSP/Outline.hs

@@ -4,6 +4,8 @@
 
 module Development.IDE.LSP.Outline
   ( setHandlersOutline
+    -- * For haskell-language-server
+  , moduleOutline
   )
 where
 

src/Development/IDE/Plugin/CodeAction.hs

@@ -6,7 +6,15 @@
 #include "ghc-api-version.h"
 
 -- | Go to the definition of a variable.
-module Development.IDE.Plugin.CodeAction(plugin) where
+module Development.IDE.Plugin.CodeAction
+    (
+      plugin
+
+    -- * For haskell-language-server
+    , codeAction
+    , codeLens
+    , rulePackageExports
+    ) where
 
 import           Language.Haskell.LSP.Types
 import Control.Monad (join)