Remove todos related to Elixir v1.15 (#2354)

Co-authored-by: Jonatan Kłosko <jonatanklosko@gmail.com>

lib/livebook/runtime/erl_dist.ex

@@ -38,7 +38,6 @@ defmodule Livebook.Runtime.ErlDist do
       Livebook.Runtime.ErlDist.RuntimeServer,
       Livebook.Runtime.ErlDist.EvaluatorSupervisor,
       Livebook.Runtime.ErlDist.IOForwardGL,
-      Livebook.Runtime.ErlDist.LoggerGLBackend,
       Livebook.Runtime.ErlDist.LoggerGLHandler,
       Livebook.Runtime.ErlDist.Sink,
       Livebook.Runtime.ErlDist.SmartCellGL

lib/livebook/runtime/erl_dist/logger_gl_backend.ex

@@ -1,135 +0,0 @@
-defmodule Livebook.Runtime.ErlDist.LoggerGLBackend do
-  # A logger backend used to forward logs to Livebook,
-  # as with regular output.
-  #
-  # The backend is based on `Logger.Backends.Console`,
-  # but instead of logging to the console, it sends
-  # log output to the group leader of the source process,
-  # provided the group leader is an instance of
-  # `Livebook.Runtime.Evaluator.IOProxy`.
-  #
-  # Basic configuration is taken from the console
-  # logger configuration to match its formatting.
-
-  @behaviour :gen_event
-
-  @type state :: %{
-          colors: keyword(),
-          format: binary(),
-          level: atom(),
-          metadata: list(atom())
-        }
-
-  @impl true
-  def init(__MODULE__) do
-    config = Application.get_env(:logger, :console, [])
-    {:ok, init_state(config)}
-  end
-
-  @impl true
-  def handle_event({level, gl, {Logger, msg, ts, md}}, state) do
-    %{level: log_level} = state
-
-    if meet_level?(level, log_level) do
-      log_event(level, msg, ts, md, gl, state)
-    end
-
-    {:ok, state}
-  end
-
-  def handle_event(_, state) do
-    {:ok, state}
-  end
-
-  @impl true
-  def code_change(_old_vsn, state, _extra) do
-    {:ok, state}
-  end
-
-  @impl true
-  def handle_call(_message, state) do
-    {:ok, :ok, state}
-  end
-
-  @impl true
-  def handle_info(_message, state) do
-    {:ok, state}
-  end
-
-  @impl true
-  def terminate(_reason, _state) do
-    :ok
-  end
-
-  defp init_state(config) do
-    level = Keyword.get(config, :level)
-    format = Logger.Formatter.compile(Keyword.get(config, :format))
-    colors = configure_colors(config)
-    metadata = Keyword.get(config, :metadata, []) |> configure_metadata()
-
-    %{format: format, metadata: metadata, level: level, colors: colors}
-  end
-
-  defp configure_metadata(:all), do: :all
-  defp configure_metadata(metadata), do: Enum.reverse(metadata)
-
-  defp configure_colors(config) do
-    colors = Keyword.get(config, :colors, [])
-
-    %{
-      debug: Keyword.get(colors, :debug, :cyan),
-      info: Keyword.get(colors, :info, :normal),
-      warn: Keyword.get(colors, :warn, :yellow),
-      error: Keyword.get(colors, :error, :red),
-      enabled: Keyword.get(colors, :enabled, IO.ANSI.enabled?())
-    }
-  end
-
-  defp meet_level?(_lvl, nil), do: true
-
-  defp meet_level?(lvl, min) do
-    Logger.compare_levels(lvl, min) != :lt
-  end
-
-  defp log_event(level, msg, ts, md, gl, state) do
-    output = format_event(level, msg, ts, md, state)
-
-    if Livebook.Runtime.ErlDist.NodeManager.known_io_proxy?(gl) do
-      async_io(gl, output)
-    else
-      send(Livebook.Runtime.ErlDist.NodeManager, {:orphan_log, output})
-    end
-  end
-
-  def async_io(device, output) when is_pid(device) do
-    send(device, {:io_request, self(), make_ref(), {:put_chars, :unicode, output}})
-  end
-
-  defp format_event(level, msg, ts, md, state) do
-    %{format: format, metadata: keys, colors: colors} = state
-
-    format
-    |> Logger.Formatter.format(level, msg, ts, take_metadata(md, keys))
-    |> color_event(level, colors, md)
-  end
-
-  defp take_metadata(metadata, :all) do
-    metadata
-  end
-
-  defp take_metadata(metadata, keys) do
-    Enum.reduce(keys, [], fn key, acc ->
-      case Keyword.fetch(metadata, key) do
-        {:ok, val} -> [{key, val} | acc]
-        :error -> acc
-      end
-    end)
-  end
-
-  defp color_event(data, _level, %{enabled: false}, _md), do: data
-
-  defp color_event(data, level, %{enabled: true} = colors, md) do
-    color = md[:ansi_color] || Map.fetch!(colors, level)
-    IO.ANSI.format([color, data])
-  end
-end

lib/livebook/runtime/erl_dist/node_manager.ex

@@ -91,20 +91,15 @@ defmodule Livebook.Runtime.ErlDist.NodeManager do
     Process.unregister(:standard_error)
     Process.register(io_forward_gl_pid, :standard_error)
 
-    # TODO: remove logger backend once we require Elixir v1.15
-    if Code.ensure_loaded?(Logger) and function_exported?(Logger, :add_handlers, 1) do
-      {:ok, _pid} = Livebook.Runtime.ErlDist.Sink.start_link()
+    {:ok, _pid} = Livebook.Runtime.ErlDist.Sink.start_link()
 
-      :logger.add_handler(:livebook_gl_handler, Livebook.Runtime.ErlDist.LoggerGLHandler, %{
-        formatter: Logger.Formatter.new(),
-        filters: [
-          code_server_logs:
-            {&Livebook.Runtime.ErlDist.LoggerGLHandler.filter_code_server_logs/2, nil}
-        ]
-      })
-    else
-      Logger.add_backend(Livebook.Runtime.ErlDist.LoggerGLBackend)
-    end
+    :logger.add_handler(:livebook_gl_handler, Livebook.Runtime.ErlDist.LoggerGLHandler, %{
+      formatter: Logger.Formatter.new(),
+      filters: [
+        code_server_logs:
+          {&Livebook.Runtime.ErlDist.LoggerGLHandler.filter_code_server_logs/2, nil}
+      ]
+    })
 
     # Set `ignore_module_conflict` only for the NodeManager lifetime.
     initial_ignore_module_conflict = Code.compiler_options()[:ignore_module_conflict]
@@ -154,12 +149,7 @@ defmodule Livebook.Runtime.ErlDist.NodeManager do
     Process.unregister(:standard_error)
     Process.register(state.original_standard_error, :standard_error)
 
-    # TODO: remove logger backend once we require Elixir v1.15
-    if Code.ensure_loaded?(Logger) and function_exported?(Logger, :add_handlers, 1) do
-      :logger.remove_handler(:livebook_gl_handler)
-    else
-      Logger.remove_backend(Livebook.Runtime.ErlDist.LoggerGLBackend)
-    end
+    :logger.remove_handler(:livebook_gl_handler)
 
     if state.unload_modules_on_termination do
       ErlDist.unload_required_modules()

lib/livebook/runtime/erl_dist/runtime_server.ex

@@ -387,7 +387,7 @@ defmodule Livebook.Runtime.ErlDist.RuntimeServer do
   def handle_info({:orphan_log, output}, state) do
     with %{} = evaluator <- state.last_evaluator,
          {:group_leader, io_proxy} <- Process.info(evaluator.pid, :group_leader) do
-      ErlDist.LoggerGLBackend.async_io(io_proxy, output)
+      ErlDist.LoggerGLHandler.async_io(io_proxy, output)
     end
 
     {:noreply, state}

lib/livebook/runtime/evaluator.ex

@@ -613,7 +613,7 @@ defmodule Livebook.Runtime.Evaluator do
 
   defp eval(:elixir, code, binding, env) do
     {{result, extra_diagnostics}, diagnostics} =
-      with_diagnostics([log: true], fn ->
+      Code.with_diagnostics([log: true], fn ->
         try do
           quoted = Code.string_to_quoted!(code, file: env.file)
 
@@ -816,17 +816,6 @@ defmodule Livebook.Runtime.Evaluator do
     Enum.reject(code_markers, &(&1.line == 0))
   end
 
-  # TODO: remove once we require Elixir v1.15
-  if Code.ensure_loaded?(Code) and function_exported?(Code, :with_diagnostics, 2) do
-    defp with_diagnostics(opts, fun) do
-      Code.with_diagnostics(opts, fun)
-    end
-  else
-    defp with_diagnostics(_opts, fun) do
-      {fun.(), []}
-    end
-  end
-
   defp extra_diagnostic?(%SyntaxError{}), do: true
   defp extra_diagnostic?(%TokenMissingError{}), do: true
 
@@ -847,11 +836,6 @@ defmodule Livebook.Runtime.Evaluator do
           do: {:variable, var},
           into: identifiers_used
 
-    identifiers_used =
-      for var <- tracer_info.undefined_vars,
-          do: {:variable, var},
-          into: identifiers_used
-
     identifiers_defined =
       for var <- vars_defined(context, prev_context),
           do: {{:variable, var}, context.id},

lib/livebook/runtime/evaluator/doctests.ex

@@ -92,25 +92,11 @@ defmodule Livebook.Runtime.Evaluator.Doctests do
   defp report_doctest_result(%{state: {:failed, failure}} = test, lines) do
     doctest_line = test.tags.doctest_line
     [prompt_line | _] = lines = Enum.drop(lines, doctest_line - 1)
-
-    end_line =
-      if end_line = test.tags[:doctest_data][:end_line] do
-        end_line
-      else
-        # TODO: Remove this branch once we require Elixir v1.15+
-        interval =
-          lines
-          |> Enum.take_while(&(not end_of_doctest?(&1)))
-          |> length()
-
-        interval + doctest_line - 1
-      end
+    end_line = test.tags[:doctest_data][:end_line]
 
     end_line =
       with {:error, %ExUnit.AssertionError{}, [{_, _, _, location} | _]} <- failure,
            assertion_line = location[:line],
-           # TODO: Remove this check once we require Elixir v1.15+
-           true <- is_integer(test.tags[:doctest_data][:end_line]),
            true <- assertion_line in doctest_line..end_line do
         end_line -
           length(
@@ -148,17 +134,6 @@ defmodule Livebook.Runtime.Evaluator.Doctests do
     end
   end
 
-  defp end_of_doctest?(line) do
-    case String.trim_leading(line) do
-      "" -> true
-      "```" <> _ -> true
-      "~~~" <> _ -> true
-      "'''" <> _ -> true
-      "\"\"\"" <> _ -> true
-      _ -> false
-    end
-  end
-
   defp define_test_module(doctests_specs) do
     id =
       doctests_specs

lib/livebook/runtime/evaluator/tracer.ex

@@ -14,8 +14,7 @@ defmodule Livebook.Runtime.Evaluator.Tracer do
             requires_used: MapSet.new(),
             requires_defined: MapSet.new(),
             imports_used?: false,
-            imports_defined?: false,
-            undefined_vars: MapSet.new()
+            imports_defined?: false
 
   @type t :: %__MODULE__{
           modules_used: MapSet.t(),
@@ -25,8 +24,7 @@ defmodule Livebook.Runtime.Evaluator.Tracer do
           requires_used: MapSet.t(),
           requires_defined: MapSet.t(),
           imports_used?: boolean(),
-          imports_defined?: boolean(),
-          undefined_vars: MapSet.t()
+          imports_defined?: boolean()
         }
 
   @doc false
@@ -62,13 +60,11 @@ defmodule Livebook.Runtime.Evaluator.Tracer do
         if(env.module, do: [], else: [:import_defined]) ++
           [{:module_used, module}, {:alias_used, module}]
 
-      {:imported_function, meta, module, name, _arity} ->
-        var? = Keyword.has_key?(meta, :if_undefined)
-        [{:module_used, module}, {:import_used, name, var?}]
+      {:imported_function, _meta, module, _name, _arity} ->
+        [{:module_used, module}, :import_used]
 
-      {:imported_macro, meta, module, name, _arity} ->
-        var? = Keyword.has_key?(meta, :if_undefined)
-        [{:module_used, module}, {:import_used, name, var?}]
+      {:imported_macro, _meta, module, _name, _arity} ->
+        [{:module_used, module}, :import_used]
 
       {:alias, _meta, alias, as, _opts} ->
         if(env.module, do: [], else: [{:alias_defined, as, alias}]) ++
@@ -136,14 +132,8 @@ defmodule Livebook.Runtime.Evaluator.Tracer do
     update_in(info.requires_defined, &MapSet.put(&1, module))
   end
 
-  defp apply_update(info, {:import_used, name, var?}) do
-    info = put_in(info.imports_used?, true)
-
-    if var? do
-      update_in(info.undefined_vars, &MapSet.put(&1, {name, nil}))
-    else
-      info
-    end
+  defp apply_update(info, :import_used) do
+    put_in(info.imports_used?, true)
   end
 
   defp apply_update(info, :import_defined) do

test/livebook/runtime/evaluator_test.exs

@@ -834,22 +834,6 @@ defmodule Livebook.Runtime.EvaluatorTest do
       assert {:variable, {:z, nil}} not in identifiers.used
     end
 
-    test "reports parentheses-less arity-0 import as a used variable", %{evaluator: evaluator} do
-      # TODO: remove all logic around undefined unused vars once we require Elixir v1.15
-      Code.put_compiler_option(:on_undefined_variable, :warn)
-
-      identifiers =
-        """
-        self
-        """
-        |> eval(evaluator, 0)
-
-      Code.put_compiler_option(:on_undefined_variable, :raise)
-
-      assert {:variable, {:self, nil}} in identifiers.used
-      assert :imports in identifiers.used
-    end
-
     test "module definition", %{evaluator: evaluator} do
       identifiers =
         """