Partially revert dropping 1.12 support

This partially reverts commit bd3d3bb.

Author: lukaszsamson

apps/elixir_ls_debugger/lib/debugger/server.ex

@@ -206,6 +206,7 @@ defmodule ElixirLS.Debugger.Server do
         )
 
         Output.debugger_important("Terminating #{__MODULE__}: #{message}")
+
         unless Application.get_env(:elixir_ls_debugger, :test_mode) do
           System.stop(1)
         end

apps/language_server/lib/language_server/mix_shell.ex

@@ -55,7 +55,12 @@ defmodule ElixirLS.LanguageServer.MixShell do
           true
       end
     else
-      Mix.Shell.IO.yes?(message, options)
+      # TODO convert to to normal call when we require elixir 1.13
+      if Version.match?(System.version(), "< 1.13.0-dev") do
+        apply(Mix.Shell.IO, :yes?, [message])
+      else
+        apply(Mix.Shell.IO, :yes?, [message, options])
+      end
     end
   end
 end

apps/language_server/lib/language_server/providers/execute_command/get_ex_unit_tests_in_file.ex

@@ -4,15 +4,19 @@ defmodule ElixirLS.LanguageServer.Providers.ExecuteCommand.GetExUnitTestsInFile
 
   @impl ElixirLS.LanguageServer.Providers.ExecuteCommand
   def execute([uri], _state) do
-    path = SourceFile.Path.from_uri(uri)
+    if Version.match?(System.version(), ">= 1.13.0-dev") do
+      path = SourceFile.Path.from_uri(uri)
 
-    case ExUnitTestTracer.get_tests(path) do
-      {:ok, tests} ->
-        {:ok, tests}
+      case ExUnitTestTracer.get_tests(path) do
+        {:ok, tests} ->
+          {:ok, tests}
 
-      {:error, _reason} ->
-        # TODO catch only Compile and Syntax errors?
-        {:ok, []}
+        {:error, _reason} ->
+          # TODO catch only Compile and Syntax errors?
+          {:ok, []}
+      end
+    else
+      {:ok, []}
     end
   end
 end

apps/language_server/lib/language_server/providers/folding_range/token.ex

@@ -34,6 +34,11 @@ defmodule ElixirLS.LanguageServer.Providers.FoldingRange.Token do
           {:sigil, {b1, b2, b3}, _, _, _, _, delimiter} ->
             {:sigil, {b1 - 1, b2 - 1, b3}, delimiter}
 
+          # Older versions of Tokenizer.tokenize/1
+          # TODO check which version
+          {:sigil, {b1, b2, b3}, _, _, _, delimiter} ->
+            {:sigil, {b1 - 1, b2 - 1, b3}, delimiter}
+
           {:bin_heredoc, {b1, b2, b3}, _, _} ->
             {:bin_heredoc, {b1 - 1, b2 - 1, b3}, nil}
 

apps/language_server/lib/language_server/tracer.ex

@@ -268,8 +268,12 @@ defmodule ElixirLS.LanguageServer.Tracer do
       end
 
     attributes =
-      for name <- apply(Module, :attributes_in, [module]) do
-        {name, Module.get_attribute(module, name)}
+      if Version.match?(System.version(), ">= 1.13.0-dev") do
+        for name <- apply(Module, :attributes_in, [module]) do
+          {name, Module.get_attribute(module, name)}
+        end
+      else
+        []
       end
 
     %{