Update Hover to return MarkupContent

Author: Jonathan Arnett

apps/language_server/lib/language_server/providers/hover.ex

@@ -49,6 +49,9 @@ defmodule ElixirLS.LanguageServer.Providers.Hover do
   end
 
   defp contents(%{docs: markdown}) do
-    markdown
+    %{
+      kind: "markdown",
+      value: markdown
+    }
   end
 end

apps/language_server/test/server_test.exs

@@ -76,7 +76,10 @@ defmodule ElixirLS.LanguageServer.ServerTest do
     resp = assert_receive(%{"id" => 1}, 1000)
 
     assert response(1, %{
-             "contents" => "> GenServer" <> _,
+             "contents" => %{
+               "kind" => "markdown",
+               "value" => "> GenServer" <> _
+             },
              "range" => %{
                "start" => %{"line" => 2, "character" => 12},
                "end" => %{"line" => 2, "character" => 21}