Handle string function name parameter

Author: robmckinnon

apps/language_server/lib/language_server/experimental/code_mod/extract_function.ex

@@ -9,6 +9,9 @@ defmodule ElixirLS.LanguageServer.Experimental.CodeMod.ExtractFunction do
   Return zipper containing AST with extracted function.
   """
   def extract_function(zipper, start_line, end_line, function_name) do
+    function_name =
+      if is_binary(function_name), do: String.to_atom(function_name), else: function_name
+
     {quoted_after_extract, acc} = extract_lines(zipper, start_line, end_line, function_name)
     if Enum.empty?(acc.lines) do
       {:error, :not_extractable}

apps/language_server/test/experimental/code_mod/extract_function_test.exs

@@ -37,7 +37,7 @@ defmodule ElixirLS.LanguageServer.Experimental.CodeMod.ExtractFunctionTest do
   describe "extract_function" do
     @tag no: 1
     test "extract one line to function", %{quoted: quoted} do
-      zipper = ExtractFunction.extract_function(Z.zip(quoted), 3, 3, :bar)
+      zipper = ExtractFunction.extract_function(Z.zip(quoted), 3, 3, "bar")
       source = Sourceror.to_string(zipper)
 
       assert [