merge

apps/amethyst/lib/api/game.ex

@@ -16,8 +16,9 @@
 
 defmodule Amethyst.API.Game do
   @moduledoc """
-  This module includes the interface for defining and registering
-  a game with Amethyst.
+  This behaviour should be implemented by any Amethyst Game. It additionally
+  contains functions that the internal connection handler code uses to more
+  conveniently call a game's callbacks.
   """
 
   @doc """
@@ -32,6 +33,9 @@ defmodule Amethyst.API.Game do
   You may either :accept or :reject the player for whatever reason, avoid
   rejecting the player in your default game as that will disconnect the player.
 
+  If you :accept the player, you must return a spawn position ({x, y, z}) and
+  rotation ({yaw, pitch})
+
   Note that if no new players can join for any reason, your game should return false from `joinable?/1`.
 
   The PID received in 'from' will be the one that calls all callbacks
@@ -43,7 +47,7 @@ defmodule Amethyst.API.Game do
   - 'player_cfg' is a keyword list containing the configuration passed by the game client
   - 'state_refs' are your references (see `instantiate/1`)
   """
-  @callback login(from :: pid(), player_cfg :: keyword(), state_refs :: map()) :: :accept | :reject
+  @callback login(from :: pid(), player_cfg :: keyword(), state_refs :: map()) :: {:accept, {x :: float(), y :: float(), z :: float()}, {yaw :: float(), pitch ::float()}} | :reject
   def login(%{:mod => mod, :refs => refs}, player_cfg) do
     mod.login(self(), player_cfg, refs)
   end
@@ -60,6 +64,39 @@ defmodule Amethyst.API.Game do
     mod.player_position(self(), {x, y, z}, refs)
   end
   @doc """
+  `player_rotation/3` is called when a player rotates. This function is called with the absolute angles
+  that the player client expects. TODO: Teleport Player API.
+
+  - 'from' is the PID of the player's connection process (see `login/3`).
+  - 'yaw' and 'pitch' are the angles the player expects to rotate to. These are in Minecraft's rotation format.
+  - `state_refs` are your references (see `instantiate/1`)
+  """
+  @callback player_rotation(from :: pid(), {yaw :: float(), pitch :: float()}, state_refs :: map()) :: :ok
+  def player_rotation(%{:mod => mod, :refs => refs}, {yaw, pitch}) do
+    mod.player_rotation(self(), {yaw, pitch}, refs)
+  end
+  @doc """
+  `accept_teleport/3` is called when a client accepts a teleportation as sent by the Synchronize Player Position
+  packet (TODO: Teleport Player API). This lets you know that the client is now where you expect it to be.
+
+  - 'from' is the PID of the player's connection process (see `login/3`).
+  - 'id' is the teleport ID (TODO: Teleport Player API)
+  - 'state_refs' are your references (see `instantiate/1`)
+  """
+  @callback accept_teleport(from :: pid(), id :: integer(), state_refs :: map()) :: :ok
+  def accept_teleport(%{:mod => mod, :refs => refs}, id) do
+    mod.accept_teleport(self(), id, refs)
+  end
+  @doc """
+  The terrain of a specific chunk column. This is automatically used to load chunks for a player.
+
+  For now, this data must be formatted as a 3D list, indexed as [y][z][x].
+  """
+  @callback chunk(from :: pid(), {x :: integer(), z :: integer()}, state_refs :: map()) :: [[[pos_integer()]]]
+  def chunk(%{:mod => mod, :refs => refs}, pos) do
+    mod.chunk(self(), pos, refs)
+  end
+  @doc """
   Whether or not this game instance can be joined by a new player. This should include basic logic such as
   if joining makes sense, for instance if the game is full or if the game has already started.
   """

apps/amethyst/lib/apps/connection_handler.ex

@@ -60,6 +60,42 @@ defmodule Amethyst.ConnectionHandler do
       {:set_version, newversion} ->
         Logger.debug("Switching to version #{newversion} from #{version}")
         loop(socket, connstate, newversion, state)
+      {:set_position, position} ->
+        Logger.debug("Updating client position to #{inspect(position)}")
+        prev_position = Map.get(state, :position)
+        state = Map.put(state, :position, position)
+        # If there was no prev position, we consider that we
+        # definitely moved
+        prev_cp = if prev_position == nil do nil else chunk_pos(elem(prev_position, 0), elem(prev_position, 1)) end
+        cp = chunk_pos(elem(position, 0), elem(position, 1))
+        if prev_cp != cp do
+          Logger.debug("Client entered new chunk #{inspect(cp)}")
+          # We changed chunk borders, update center chunk and begin sending new chunks
+          send(self(), {:send_packet, %{
+            packet_type: :set_center_chunk,
+            chunk_x: elem(cp, 0),
+            chunk_z: elem(cp, 1)
+          }})
+          # Figure out which new chunks are visible
+          prev_chunks =
+            if prev_cp == nil do
+              MapSet.new([])
+            else
+              MapSet.new(visible_chunks_from(elem(prev_cp, 0), elem(prev_cp, 1), Map.get(state, :view_distance, 16)))
+            end
+          chunks = MapSet.new(visible_chunks_from(elem(cp, 0), elem(cp, 1), Map.get(state, :view_distance, 16)))
+          new_chunks = MapSet.difference(chunks, prev_chunks)
+          # We can process all chunks in parallel
+          me = self()
+          ts = state |> Map.get(:game) |> Map.get(:refs) |> Map.get(:task_supervisor)
+          Task.Supervisor.async(ts, fn ->
+            Task.Supervisor.async_stream(ts,
+            new_chunks,
+            fn chunk -> process_chunk(me, chunk, state) end,
+            [ordered: false]
+          ) |> Stream.run() end)
+        end
+        loop(socket, connstate, version, state)
       {:send_packet, packet} ->
         Logger.debug("Sending packet #{inspect(packet)}")
         send_packet(socket, connstate, packet, version)
@@ -73,6 +109,103 @@ defmodule Amethyst.ConnectionHandler do
     end
   end
 
+  defp chunk_pos(x, z) do
+    {div(floor(x), 16), div(floor(z), 16)}
+  end
+
+  defp visible_chunks_from(x, z, view_distance) do
+    {cx, cz} = chunk_pos(x, z)
+    (cx - view_distance - 3 .. cx + view_distance + 3) |> Enum.flat_map(fn ix ->
+      (cz - view_distance - 3 .. cz + view_distance + 3) |> Enum.map(fn iz ->
+        {ix, iz}
+      end)
+    end)
+  end
+
+  defp process_chunk(to, chunk, state) do
+    import Amethyst.NBT.Write
+    alias Amethyst.Minecraft.Write
+
+    chunk_array = Amethyst.API.Game.chunk(Map.get(state, :game), chunk)
+    {cx, cz} = chunk
+
+    # TODO: Actually do heightmaps
+    # TODO: Doing all this processing could be at home somewhere else
+    heightmaps = compound(%{})
+
+    data = Enum.chunk_every(chunk_array, 16, 16, 0) # 0 -> air
+        |> Enum.reduce("", fn chunk_section, acc ->
+          blocks = chunk_section |> List.flatten()
+          block_count = blocks |> Enum.filter(&(&1 != 0)) |> length
+
+          # Put together the palette
+          unique_blocks = MapSet.new(blocks)
+          min_bpe = MapSet.size(unique_blocks) |> :math.log2() |> ceil()
+          paletted_container_data = case min_bpe do
+            0 -> <<0::8>> <>
+            # SINGLE VALUED
+              Write.varint(MapSet.to_list(unique_blocks) |> List.first()) <>
+              Write.varint(0) # No data, empty pallette
+            min_bpe when min_bpe in 1..8 ->
+            # INDIRECT
+              # Minimum bpe accepted by minecraft is 4
+              bpe = max(min_bpe, 4)
+              palette = MapSet.to_list(unique_blocks) |>
+                Enum.with_index() |>
+                Map.new(fn {i, v} -> {v, i} end)
+              paletted_blocks = blocks |>
+                Enum.map(&(Map.get(palette, &1)))
+              paletted_data = long_aligned_bit_string_reduce(paletted_blocks, bpe)
+
+              Write.ubyte(bpe) <>
+              Write.varint(map_size(palette)) <>
+              Enum.reduce(0..(map_size(palette)-1), "", fn i, acc ->
+                acc <> Write.varint(Map.get(palette, i))
+              end) <>
+              Write.varint(floor(bit_size(paletted_data) / 64)) <>
+              paletted_data
+            _ ->
+            # DIRECT
+              data = long_aligned_bit_string_reduce(blocks, 15)
+              Write.ubyte(15) <>
+              Write.varint(floor(bit_size(data) / 64)) <>
+              data
+          end
+
+          # TODO: Send biome data, if that even makes sense
+          acc <> Write.short(block_count) <> paletted_container_data <> <<0::8, 0::8>>
+        end)
+
+      send(to, {:send_packet, %{
+        packet_type: :chunk_data_and_update_light,
+        chunk_x: cx, chunk_z: cz,
+        heightmaps: heightmaps,
+        data: data,
+        block_entities: [],
+        # TODO: Light
+        sky_light_mask: <<0>>,
+        block_light_mask: <<0>>,
+        empty_sky_light_mask: <<0>>,
+        empty_block_light_mask: <<0>>,
+        sky_light_arrays: [],
+        block_light_arrays: []
+      }})
+      :ok
+  end
+
+  defp long_aligned_bit_string_reduce(values, bpe) do
+    values |> Enum.reduce(<<>>, fn value, acc ->
+      next = <<acc::bitstring, value::size(bpe)-big>>
+      # man i hope they dont suddenly change the size of a long
+      if rem(bit_size(next), 64) + bpe < 64 do
+        # gotta pad it
+        <<next::bitstring, 0::big-size(64 - rem(bit_size(next), 64))>>
+      else
+        next
+      end
+    end)
+  end
+
   defp handle_packet(id, data, connstate, version, state) do
     try do
       packet = connstate.deserialize(id, version, data)

apps/amethyst/lib/apps/tcp_listener.ex

@@ -21,7 +21,7 @@ defmodule Amethyst.TCPListener do
   """
 
   def accept(port) do
-    {:ok, socket} = :gen_tcp.listen(port, [:binary, packet: 0, active: false, reuseaddr: true])
+    {:ok, socket} = :gen_tcp.listen(port, [:binary, packet: 0, active: false, reuseaddr: true, nodelay: true])
     Logger.info("Listening on port #{port}")
     loop_acceptor(socket)
   end

apps/amethyst/lib/states/configuration.ex

@@ -258,6 +258,8 @@ defmodule Amethyst.ConnectionState.Configuration do
         %{id: "minecraft:stalagmite", data: generic_damage},
         %{id: "minecraft:outside_border", data: generic_damage},
         %{id: "minecraft:generic_kill", data: generic_damage},
+        %{id: "minecraft:hot_floor", data: generic_damage},
+        %{id: "minecraft:in_wall", data: generic_damage},
       ]
     }})
     send(self(), {:send_packet, %{packet_type: :finish_configuration}})
@@ -269,10 +271,12 @@ defmodule Amethyst.ConnectionState.Configuration do
     send(self(), {:set_state, Amethyst.ConnectionState.Play})
     game = Application.fetch_env!(:amethyst, :default_game) |> Amethyst.GameCoordinator.find_or_create()
     state = state |> Map.put(:game, game)
-    if Amethyst.API.Game.login(game, state) == :reject do
+    login = Amethyst.API.Game.login(game, state)
+    case login do
+      :reject ->
         send(self(), {:disconnect, "Default game rejected connection"})
         :ok
-    else
+      {:accept, {x, y, z}, {yaw, pitch}} ->
         send(self(), {:send_packet, %{
           packet_type: :login,
           entity_id: 0,
@@ -295,6 +299,16 @@ defmodule Amethyst.ConnectionState.Configuration do
           portal_cooldown: 0,
           enforces_secure_chat: false
         }})
+        send(self(), {:send_packet, %{
+          packet_type: :synchronize_player_position,
+          x: x, y: y, z: z, yaw: yaw, pitch: pitch, teleport_id: 0, flags: 0x00
+        }})
+        send(self(), {:send_packet, Amethyst.ConnectionState.Play.ge_start_waiting_for_level_chunks(767)})
+        send(self(), {:send_packet, %{packet_type: :set_center_chunk,
+          chunk_x: div(floor(x), 16),
+          chunk_z: div(floor(z), 16)
+        }})
+        send(self(), {:set_position, {x, y, z}})
         state
     end
   end

apps/amethyst/lib/states/login.ex

@@ -70,7 +70,7 @@ defmodule Amethyst.ConnectionState.Login do
         uuid: player_uuid,
         username: name,
         properties: [],
-        strict_error_handling: false
+        strict_error_handling: true
       }})
       :ok
     end

apps/amethyst/lib/states/macros.ex

@@ -16,18 +16,18 @@
 
 defmodule Amethyst.ConnectionState.Macros do
   require Logger
-  defmacro defpacket_serverbound(name, id, version, signature) do
+  defmacro defpacket_serverbound(name, id, version, signature, where \\ true) do
     quote do
-      def deserialize(unquote(id), unquote(version), data) do
+      def deserialize(unquote(id), unquote(version), data) when unquote(where) do
         {packet, ""} = Amethyst.ConnectionState.Macros.read_signature(data, unquote(signature))
         packet |> Map.put(:packet_type, unquote(name))
       end
     end
   end
 
-  defmacro defpacket_clientbound(name, id, version, signature) do
+  defmacro defpacket_clientbound(name, id, version, signature, where \\ true) do
     quote do
-      def serialize(%{packet_type: unquote(name)} = packet, unquote(version)) do
+      def serialize(%{packet_type: unquote(name)} = packet, unquote(version)) when unquote(where) do
         if Amethyst.ConnectionState.Macros.check_type(packet, unquote(signature)) do
           Amethyst.Minecraft.Write.varint(unquote(id)) <> Amethyst.ConnectionState.Macros.write_signature(packet, unquote(signature))
         else
@@ -79,7 +79,6 @@ defmodule Amethyst.ConnectionState.Macros do
 
   def write_signature(packet, signature) do
     Enum.reduce(signature, "", fn {name, type}, acc ->
-      #acc <> apply(Write, type, [Map.get(packet, name)])
       case type do
         {:optional, {:compound, signature}} ->
           case Map.get(packet, name) do
@@ -96,6 +95,7 @@ defmodule Amethyst.ConnectionState.Macros do
           Enum.reduce(Map.get(packet, name), "", fn item, acc ->
               acc <> write_signature(item, signature)
           end)
+        {:literal, {type, value}} -> acc <> apply(Write, type, [value])
         t -> acc <> apply(Write, t, [Map.get(packet, name)])
       end
     end)
@@ -105,7 +105,12 @@ defmodule Amethyst.ConnectionState.Macros do
     try do
       Enum.all?(signature, fn {name, type} ->
         case Map.get(packet, name, :missing) do
-          :missing -> throw {:missing, name}
+          :missing ->
+            if elem(type, 0) == :literal do
+              true
+            else
+              throw {:missing, name}
+            end
           value -> case type_matches(value, type) do
             true -> true
             false -> throw {:mismatch, name, value, type}
@@ -126,8 +131,8 @@ defmodule Amethyst.ConnectionState.Macros do
   def type_matches(value, :ushort) when is_integer(value) and value in 0..65535, do: true
   def type_matches(value, :int) when is_integer(value) and value in -2147483648..2147483647, do: true
   def type_matches(value, :long) when is_integer(value) and value in -9223372036854775808..9223372036854775807, do: true
-  def type_matches(value, :float) when is_float(value), do: true
-  def type_matches(value, :double) when is_float(value), do: true
+  def type_matches(value, :float) when is_number(value), do: true
+  def type_matches(value, :double) when is_number(value), do: true
   def type_matches(value, :varint) when is_integer(value) and value in -2147483648..2147483647, do: true
   def type_matches(value, :varlong) when is_integer(value) and value in -9223372036854775808..9223372036854775807, do: true
   def type_matches(value, :uuid) when is_binary(value) and byte_size(value) == 36, do: true

apps/amethyst/lib/states/play.ex

@@ -25,6 +25,28 @@ defmodule Amethyst.ConnectionState.Play do
   """
 
   Macros.defpacket_clientbound :disconnect, 0x1D, 767, [reason: :nbt]
+  Macros.defpacket_clientbound :chunk_data_and_update_light, 0x27, 767, [
+    chunk_x: :int,
+    chunk_z: :int,
+    heightmaps: :nbt,
+    data: :byte_array,
+    block_entities: {:array, [
+      packed_xz: :ubyte, # TODO: This would be interesting to have in a clearer format
+      y: :short,
+      type: :varint,
+      data: :nbt
+    ]},
+    sky_light_mask: :raw,
+    block_light_mask: :raw,
+    empty_sky_light_mask: :raw,
+    empty_block_light_mask: :raw,
+    sky_light_arrays: {:array, [
+      sky_light_array: :byte_array
+    ]},
+    block_light_arrays: {:array, [
+      block_light_array: :byte_array
+    ]}
+  ]
   Macros.defpacket_clientbound :login, 0x2B, 767, [
     entity_id: :int,
     is_hardcore: :bool,
@@ -49,6 +71,133 @@ defmodule Amethyst.ConnectionState.Play do
     portal_cooldown: :varint,
     enforces_secure_chat: :bool,
   ]
+  Macros.defpacket_clientbound :player_info_update_add_player, 0x2E, 767, [
+    actions: {:literal, 0x01},
+    players: {:array, [
+      uuid: :uuid,
+      name: :string,
+      properties: {:array, [
+        name: :string,
+        value: :string,
+        signature: {:optional, :string},
+      ]}
+    ]}
+  ]
+  Macros.defpacket_clientbound :player_info_update_initialize_chat, 0x2E, 767, [
+    actions: {:literal, 0x02},
+    players: {:array, [
+      uuid: :uuid,
+      data: {:optional, {:compound, [
+        chat_session_id: :uuid,
+        public_key_expiry_time: :long,
+        encoded_public_key: :byte_array,
+        public_key_signature: :byte_array
+      ]}}
+    ]}
+  ]
+  Macros.defpacket_clientbound :player_info_update_update_game_mode, 0x2E, 767, [
+    actions: {:literal, 0x04},
+    players: {:array, [
+      uuid: :uuid,
+      gamemode: :varint
+    ]}
+  ]
+  Macros.defpacket_clientbound :player_info_update_update_listed, 0x2E, 767, [
+    actions: {:literal, 0x08},
+    players: {:array, [
+      uuid: :uuid,
+      listed: :bool
+    ]}
+  ]
+  Macros.defpacket_clientbound :player_info_update_update_latency, 0x2E, 767, [
+    actions: {:literal, 0x10},
+    players: {:array, [
+      uuid: :uuid,
+      ping: :varint, # Milliseconds
+    ]}
+  ]
+  Macros.defpacket_clientbound :player_info_update_update_display_name, 0x2E, 767, [
+    actions: {:literal, 0x20},
+    players: {:array, [
+      uuid: :uuid,
+      display_name: {:optional, :nbt}
+    ]}
+  ]
+  Macros.defpacket_clientbound :synchronize_player_position, 0x40, 767, [
+    x: :double,
+    y: :double,
+    z: :double,
+    yaw: :float,
+    pitch: :float,
+    flags: :byte,
+    teleport_id: :varint
+  ]
+  Macros.defpacket_clientbound :set_center_chunk, 0x54, 767, [
+    chunk_x: :varint, chunk_z: :varint
+  ]
+
+  Macros.defpacket_clientbound :game_event, 0x22, 767, [
+    event: :ubyte, value: :float
+  ]
+  # We can use functions to wrap over this packet and make it a bit clearer.
+  # Taking the protocol version here makes it less portable but whatever, fuck this packet
+  def ge_no_respawn_block_available(767), do: %{packet_type: :game_event, event: 0, value: 0}
+  def ge_begin_raining(767), do: %{packet_type: :game_event, event: 1, value: 0}
+  def ge_end_raining(767), do: %{packet_type: :game_event, event: 2, value: 0}
+  def ge_change_game_mode(767, gm) when is_integer(gm), do: %{packet_type: :game_event, event: 3, value: gm}
+  def ge_win_game(767, credits?) when is_integer(credits?), do: %{packet_type: :game_event, event: 4, value: credits?}
+  def ge_game_event(767, event) when is_integer(event), do: %{packet_type: :game_event, event: 5, value: event}
+  def ge_arrow_hit_player(767), do: %{packet_type: :game_event, event: 6, value: 0}
+  def ge_rain_level_change(767, value) when is_number(value), do: %{packet_type: :game_event, event: 7, value: value}
+  def ge_thunder_level_change(767, value) when is_number(value), do: %{packet_type: :game_event, event: 8, value: value}
+  def ge_play_pufferfish_sting_sound(767), do: %{packet_type: :game_event, event: 9, value: 0}
+  def ge_play_elder_guardian_mob_appearance(767), do: %{packet_type: :game_event, event: 10, value: 0}
+  def ge_enable_respawn_screen(767, enabled?) when is_integer(enabled?), do: %{packet_type: :game_event, event: 11, value: enabled?}
+  def ge_limited_crafting(767, enabled?) when is_integer(enabled?), do: %{packet_type: :game_event, event: 12, value: enabled?}
+  def ge_start_waiting_for_level_chunks(767), do: %{packet_type: :game_event, event: 13, value: 0}
+
+  Macros.defpacket_serverbound :confirm_teleportation, 0x00, 767, [teleport_id: :varint]
+  Macros.defpacket_serverbound :set_player_position, 0x1A, 767, [
+    x: :double,
+    feet_y: :double,
+    z: :double,
+    on_ground: :bool
+  ]
+  Macros.defpacket_serverbound :set_player_position_and_rotation, 0x1B, 767, [
+    x: :double,
+    feet_y: :double,
+    z: :double,
+    yaw: :float,
+    pitch: :float,
+    on_ground: :bool
+  ]
+  Macros.defpacket_serverbound :set_player_rotation, 0x1C, 767, [
+    yaw: :float,
+    pitch: :float,
+    on_ground: :bool # I don't understand their obsession with this...
+  ]
+
+  def handle(%{packet_type: :confirm_teleportation, teleport_id: id}, 767, state) do
+    Amethyst.API.Game.accept_teleport(state[:game], id)
+    :ok
+  end
+
+  def handle(%{packet_type: :set_player_position_and_rotation, x: x, feet_y: y, z: z, yaw: yaw, pitch: pitch, on_ground: _ground}, 767, state) do
+    # I don't know why we would ever trust on_ground here... the server computes that
+    Amethyst.API.Game.player_position(state[:game], {x, y, z})
+    Amethyst.API.Game.player_rotation(state[:game], {yaw, pitch})
+    :ok
+  end
+  def handle(%{packet_type: :set_player_position, x: x, feet_y: y, z: z, on_ground: _ground}, 767, state) do
+    # I don't know why we would ever trust on_ground here... the server computes that
+    Amethyst.API.Game.player_position(state[:game], {x, y, z})
+    :ok
+  end
+  def handle(%{packet_type: :set_player_rotation, yaw: yaw, pitch: pitch, on_ground: _ground}, 767, state) do
+    # I don't know why we would ever trust on_ground here... the server computes that
+    Amethyst.API.Game.player_rotation(state[:game], {yaw, pitch})
+    :ok
+  end
 
   def disconnect(reason) do
     %{

apps/example_game/lib/example/game.ex

@@ -12,17 +12,46 @@ defmodule Example.Game do
   def login(from, cfg, refs) do
     Logger.info("Player logged in from #{inspect(from)}: #{inspect(cfg)}")
     Logger.info("The refs for this game are #{inspect(refs)}")
-    :accept
+    {:accept, {0.0, 10.0, 0.0}, {0.0, 0.0}}
   end
 
   @impl true
+  @spec player_position(any(), {any(), any(), any()}, any()) :: :ok
   def player_position(from, {x, y, z}, _refs) do
     Logger.info("Player at #{inspect(from)} moved to #{x}, #{y}, #{z}")
     :ok
   end
 
+  @impl true
+  def player_rotation(from, {yaw, pitch}, _refs) do
+    Logger.info("Player at #{inspect(from)} rotated to #{yaw}, #{pitch}")
+    :ok
+  end
+
+  @impl true
+  def accept_teleport(from, id, _state_refs) do
+    Logger.info("Player at #{inspect(from)} accepted teleport #{inspect(id)}")
+    :ok
+  end
+
   @impl true
   def joinable?(_refs) do
     true
   end
+
+  @impl true
+  def chunk(_from, {x, z}, _state_refs) do
+    # Logger.info("Player at #{inspect(from)} wants to know chunk #{x}, #{z}")
+    (0..255) |> Enum.map(fn y ->
+      if y < 5 do
+        (0..15) |> Enum.map(fn _z ->
+          (0..15) |> Enum.map(fn _x -> 1 end)
+        end)
+      else
+        (0..15) |> Enum.map(fn _z ->
+          (0..15) |> Enum.map(fn _x -> 0 end)
+        end)
+      end
+    end)
+  end
 end

config/config.exs

@@ -10,5 +10,5 @@
 import Config
   config :logger, :console,
     level: :debug,
-    format: "$date $time [$level] $metadata$message",
+    format: "$date $time [$level] $metadata$message\n",
     metadata: []

mix.lock

@@ -2,6 +2,7 @@
   "bunt": {:hex, :bunt, "1.0.0", "081c2c665f086849e6d57900292b3a161727ab40431219529f13c4ddcf3e7a44", [:mix], [], "hexpm", "dc5f86aa08a5f6fa6b8096f0735c4e76d54ae5c9fa2c143e5a1fc7c1cd9bb6b5"},
   "credo": {:hex, :credo, "1.7.7", "771445037228f763f9b2afd612b6aa2fd8e28432a95dbbc60d8e03ce71ba4446", [:mix], [{:bunt, "~> 0.2.1 or ~> 1.0", [hex: :bunt, repo: "hexpm", optional: false]}, {:file_system, "~> 0.2 or ~> 1.0", [hex: :file_system, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "8bc87496c9aaacdc3f90f01b7b0582467b69b4bd2441fe8aae3109d843cc2f2e"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.41", "ab34711c9dc6212dda44fcd20ecb87ac3f3fce6f0ca2f28d4a00e4154f8cd599", [:mix], [], "hexpm", "a81a04c7e34b6617c2792e291b5a2e57ab316365c2644ddc553bb9ed863ebefa"},
+  "elixir_math": {:hex, :elixir_math, "0.1.2", "5655bdf7f34e30906f31cdcf3031b43dd522ce8d2936b60ad4696b2c752bf5c9", [:mix], [], "hexpm", "34f4e4384903097a8ec566784fa8e9aa2b741247d225741f07cc48250c2aa64c"},
   "ex_doc": {:hex, :ex_doc, "0.34.2", "13eedf3844ccdce25cfd837b99bea9ad92c4e511233199440488d217c92571e8", [:mix], [{:earmark_parser, "~> 1.4.39", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_c, ">= 0.1.0", [hex: :makeup_c, repo: "hexpm", optional: true]}, {:makeup_elixir, "~> 0.14 or ~> 1.0", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1 or ~> 1.0", [hex: :makeup_erlang, repo: "hexpm", optional: false]}, {:makeup_html, ">= 0.1.0", [hex: :makeup_html, repo: "hexpm", optional: true]}], "hexpm", "5ce5f16b41208a50106afed3de6a2ed34f4acfd65715b82a0b84b49d995f95c1"},
   "file_system": {:hex, :file_system, "1.0.1", "79e8ceaddb0416f8b8cd02a0127bdbababe7bf4a23d2a395b983c1f8b3f73edd", [:mix], [], "hexpm", "4414d1f38863ddf9120720cd976fce5bdde8e91d8283353f0e31850fa89feb9e"},
   "jason": {:hex, :jason, "1.4.4", "b9226785a9aa77b6857ca22832cffa5d5011a667207eb2a0ad56adb5db443b8a", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "c5eb0cab91f094599f94d55bc63409236a8ec69a21a67814529e8d5f6cc90b3b"},