Add end keyword to completions

Author: maciej-szlosarczyk

apps/language_server/lib/language_server/providers/completion.ex

@@ -138,6 +138,7 @@ defmodule ElixirLS.LanguageServer.Providers.Completion do
       |> maybe_reject_derived_functions(context, options)
       |> Enum.map(&from_completion_item(&1, context, options))
       |> maybe_add_do(context)
+      |> maybe_add_end(context)
 
     items_json =
       items
@@ -166,6 +167,23 @@ defmodule ElixirLS.LanguageServer.Providers.Completion do
     end
   end
 
+  defp maybe_add_end(completion_items, context) do
+    if String.ends_with?(context.text_before_cursor, "end") && context.text_after_cursor == "" do
+      item = %__MODULE__{
+        label: "end",
+        kind: :keyword,
+        detail: "keyword",
+        insert_text: "end",
+        tags: [],
+        priority: 0
+      }
+
+      [item | completion_items]
+    else
+      completion_items
+    end
+  end
+
   ## Helpers
 
   defp is_incomplete(items) do

apps/language_server/test/providers/completion_test.exs

@@ -51,6 +51,36 @@ defmodule ElixirLS.LanguageServer.Providers.CompletionTest do
     assert first_item["label"] == "do"
   end
 
+  test "end is returned" do
+    text = """
+    defmodule MyModule do
+      require Logger
+
+      def enlarged_delta, do: :delta
+
+      def fun do
+        :ok
+      end
+    #    ^
+    end
+    """
+
+    {line, char} = {7, 5}
+    TestUtils.assert_has_cursor_char(text, line, char)
+
+    {:ok, %{"items" => [first_item | items]}} =
+      Completion.completion(text, line, char, @supports)
+
+    assert first_item["label"] == "end"
+
+    completions =
+      items
+      |> Enum.filter(&(&1["detail"] =~ "enlarged_delta"))
+      |> Enum.map(& &1["insertText"])
+
+    assert completions == ["enlarged_delta()"]
+  end
+
   test "returns all Logger completions on normal require" do
     text = """
     defmodule MyModule do