handle activeParameter override on signature

Completes fix for #994

Author: lukaszsamson

apps/language_server/lib/language_server/providers/signature_help.ex

@@ -22,12 +22,23 @@ defmodule ElixirLS.LanguageServer.Providers.SignatureHelp do
     {:ok, response}
   end
 
-  defp signature_response(%{documentation: documentation, name: name, params: params, spec: spec}) do
+  defp signature_response(
+         %{documentation: documentation, name: name, params: params, spec: spec} = signature
+       ) do
     params_info = for param <- params, do: %{"label" => param}
 
     label = "#{name}(#{Enum.join(params, ", ")})"
     response = %{"label" => label, "parameters" => params_info}
 
+    response =
+      case signature do
+        %{active_param: active_param} ->
+          Map.put(response, "activeParameter", active_param)
+
+        _ ->
+          response
+      end
+
     case {spec, documentation} do
       {"", ""} ->
         response

dep_versions.exs

@@ -1,5 +1,5 @@
 [
-  elixir_sense: "a9ae8bc1bd4b99957b68512eb364513898826a30",
+  elixir_sense: "d2e39a51542dec75932a20cdf430acff24896087",
   dialyxir_vendored: "d50dcd7101c6ebd37b57b7ee4a7888d8cb634782",
   jason_v: "c81537e2a5e1acacb915cf339fe400357e3c2aaa",
   erl2ex_vendored: "073ac6b9a44282e718b6050c7b27cedf9217a12a",

mix.lock

@@ -2,7 +2,7 @@
   "benchee": {:hex, :benchee, "1.1.0", "f3a43817209a92a1fade36ef36b86e1052627fd8934a8b937ac9ab3a76c43062", [:mix], [{:deep_merge, "~> 1.0", [hex: :deep_merge, repo: "hexpm", optional: false]}, {:statistex, "~> 1.0", [hex: :statistex, repo: "hexpm", optional: false]}], "hexpm", "7da57d545003165a012b587077f6ba90b89210fd88074ce3c60ce239eb5e6d93"},
   "deep_merge": {:hex, :deep_merge, "1.0.0", "b4aa1a0d1acac393bdf38b2291af38cb1d4a52806cf7a4906f718e1feb5ee961", [:mix], [], "hexpm", "ce708e5f094b9cd4e8f2be4f00d2f4250c4095be93f8cd6d018c753894885430"},
   "dialyxir_vendored": {:git, "https://github.com/elixir-lsp/dialyxir.git", "d50dcd7101c6ebd37b57b7ee4a7888d8cb634782", [ref: "d50dcd7101c6ebd37b57b7ee4a7888d8cb634782"]},
-  "elixir_sense": {:git, "https://github.com/elixir-lsp/elixir_sense.git", "a9ae8bc1bd4b99957b68512eb364513898826a30", [ref: "a9ae8bc1bd4b99957b68512eb364513898826a30"]},
+  "elixir_sense": {:git, "https://github.com/elixir-lsp/elixir_sense.git", "d2e39a51542dec75932a20cdf430acff24896087", [ref: "d2e39a51542dec75932a20cdf430acff24896087"]},
   "erl2ex_vendored": {:git, "https://github.com/elixir-lsp/erl2ex.git", "073ac6b9a44282e718b6050c7b27cedf9217a12a", [ref: "073ac6b9a44282e718b6050c7b27cedf9217a12a"]},
   "erlex_vendored": {:git, "https://github.com/elixir-lsp/erlex.git", "82db0e82ee4896491bc26dec99f5d795f03ab9f4", [ref: "82db0e82ee4896491bc26dec99f5d795f03ab9f4"]},
   "jason_v": {:git, "https://github.com/elixir-lsp/jason.git", "c81537e2a5e1acacb915cf339fe400357e3c2aaa", [ref: "c81537e2a5e1acacb915cf339fe400357e3c2aaa"]},