Initial Retrie plugin

Supports RULES, functions and type synonyms

Future work:

- Handling names properly (when retrie/#10 is fixed)
- Suggestions for pattern synonyms (when retrie/#15 is released)
- Refactorings: rename, extract, move, etc..
- Automatically add imports when unfolding
- Proper support for workspace folders

Author: pepeiborra

exe/Main.hs

@@ -69,6 +69,7 @@ import Ide.Plugin.GhcIde                  as GhcIde
 import Ide.Plugin.Floskell                as Floskell
 import Ide.Plugin.Ormolu                  as Ormolu
 import Ide.Plugin.StylishHaskell          as StylishHaskell
+import Ide.Plugin.Retrie                  as Retrie
 #if AGPL
 import Ide.Plugin.Brittany                as Brittany
 #endif
@@ -105,6 +106,7 @@ idePlugins includeExamples = pluginDescToIdePlugins allPlugins
       -- , ghcmodDescriptor      "ghcmod"
       , Ormolu.descriptor   "ormolu"
       , StylishHaskell.descriptor "stylish-haskell"
+      , Retrie.descriptor "retrie"
 #if AGPL
       , Brittany.descriptor    "brittany"
 #endif

haskell-language-server.cabal

@@ -47,6 +47,7 @@ library
       Ide.Plugin.GhcIde
       Ide.Plugin.Ormolu
       Ide.Plugin.Pragmas
+      Ide.Plugin.Retrie
       Ide.Plugin.Floskell
       Ide.Plugin.Formatter
       Ide.Plugin.StylishHaskell
@@ -83,6 +84,8 @@ library
     , optparse-simple
     , process
     , regex-tdfa >= 1.3.1.0
+    , retrie >= 0.1.1.0
+    , safe-exceptions
     , shake >= 0.17.5
     , stylish-haskell == 0.11.*
     , temporary