feat(chat): simplify socket response

Add helper methods to create the tuples `{:ok, socket}` and
`{:noreply, socket}`, and make them available in `SlaxWeb` module.

lib/slax_web.ex

@@ -55,6 +55,8 @@ defmodule SlaxWeb do
       use Phoenix.LiveView,
         layout: {SlaxWeb.Layouts, :app}
 
+      import SlaxWeb.SocketHelpers, only: [ok: 1, noreply: 1]
+
       unquote(html_helpers())
     end
   end

lib/slax_web/live/chat_room_live.ex

@@ -237,24 +237,22 @@ defmodule SlaxWeb.ChatRoomLive do
 
     Enum.each(rooms, &Chat.subscribe_to_room/1)
 
-    socket =
-      socket
-      |> assign(
-        hide_topic?: false,
-        online_users: OnlineUsers.list(),
-        rooms: rooms,
-        timezone: timezone,
-        users: users
-      )
-      |> assign_room_form(Chat.change_room(%Room{}))
-      |> stream_configure(:messages,
-        dom_id: fn
-          %Message{id: id} -> "messages-#{id}"
-          :unread_marker -> "messages-unread-marker"
-        end
-      )
-
-    {:ok, socket}
+    socket
+    |> assign(
+      hide_topic?: false,
+      online_users: OnlineUsers.list(),
+      rooms: rooms,
+      timezone: timezone,
+      users: users
+    )
+    |> assign_room_form(Chat.change_room(%Room{}))
+    |> stream_configure(:messages,
+      dom_id: fn
+        %Message{id: id} -> "messages-#{id}"
+        :unread_marker -> "messages-unread-marker"
+      end
+    )
+    |> ok()
   end
 
   @impl Phoenix.LiveView
@@ -274,28 +272,28 @@ defmodule SlaxWeb.ChatRoomLive do
 
     Chat.update_last_read_id(room, socket.assigns.current_user)
 
-    {:noreply,
-     socket
-     |> assign(
-       hide_topic?: false,
-       joined?: Chat.joined?(room, socket.assigns.current_user),
-       page_title: "# #{room.name}",
-       room: room
-     )
-     |> stream(:messages, messages, reset: true)
-     |> assign_message_form(Chat.change_message(%Message{}))
-     |> push_event("scroll_messages_to_bottom", %{})
-     |> update(:rooms, fn rooms ->
-       room_id = room.id
+    socket
+    |> assign(
+      hide_topic?: false,
+      joined?: Chat.joined?(room, socket.assigns.current_user),
+      page_title: "# #{room.name}",
+      room: room
+    )
+    |> stream(:messages, messages, reset: true)
+    |> assign_message_form(Chat.change_message(%Message{}))
+    |> push_event("scroll_messages_to_bottom", %{})
+    |> update(:rooms, fn rooms ->
+      room_id = room.id
 
-       Enum.map(rooms, fn
-         %Room{id: ^room_id} = room ->
-           %Room{room | unread_message_count: 0}
+      Enum.map(rooms, fn
+        %Room{id: ^room_id} = room ->
+          %Room{room | unread_message_count: 0}
 
-         other_room ->
-           other_room
-       end)
-     end)}
+        other_room ->
+          other_room
+      end)
+    end)
+    |> noreply()
   end
 
   @impl Phoenix.LiveView

lib/slax_web/live/chat_room_live/edit.ex

@@ -43,33 +43,32 @@ defmodule SlaxWeb.ChatRoomLive.Edit do
         |> push_navigate(to: ~p"/")
       end
 
-    {:ok, socket}
+    ok(socket)
   end
 
   @impl Phoenix.LiveView
   def handle_event("save-room", %{"room" => room_params}, socket) do
-    socket =
-      case Chat.update_room(socket.assigns.room, room_params) do
-        {:ok, room} ->
-          socket
-          |> put_flash(:info, "Room #{room.name} updated succesfully")
-          |> push_navigate(to: ~p"/rooms/#{room}")
+    socket.assigns.room
+    |> Chat.update_room(room_params)
+    |> case do
+      {:ok, room} ->
+        socket
+        |> put_flash(:info, "Room #{room.name} updated succesfully")
+        |> push_navigate(to: ~p"/rooms/#{room}")
 
-        {:error, changeset} ->
-          assign_form(socket, changeset)
-      end
-
-    {:noreply, socket}
+      {:error, changeset} ->
+        assign_form(socket, changeset)
+    end
+    |> noreply()
   end
 
   @impl Phoenix.LiveView
   def handle_event("validate-room", %{"room" => room_params}, socket) do
-    changeset =
-      socket.assigns.room
-      |> Chat.change_room(room_params)
-      |> Map.put(:action, :validate)
-
-    {:noreply, assign_form(socket, changeset)}
+    socket.assigns.room
+    |> Chat.change_room(room_params)
+    |> Map.put(:action, :validate)
+    |> then(&assign_form(socket, &1))
+    |> noreply()
   end
 
   defp assign_form(socket, %Ecto.Changeset{} = changeset) do

lib/slax_web/live/chat_room_live/index.ex

@@ -62,13 +62,11 @@ defmodule SlaxWeb.ChatRoomLive.Index do
   def mount(_params, _session, socket) do
     rooms = Chat.list_rooms_with_joined(socket.assigns.current_user)
 
-    socket =
-      socket
-      |> assign(page_title: "All rooms")
-      |> stream_configure(:rooms, dom_id: fn {room, _joined?} -> "rooms-#{room.id}" end)
-      |> stream(:rooms, rooms)
-
-    {:ok, socket}
+    socket
+    |> assign(page_title: "All rooms")
+    |> stream_configure(:rooms, dom_id: fn {room, _joined?} -> "rooms-#{room.id}" end)
+    |> stream(:rooms, rooms)
+    |> ok()
   end
 
   @impl Phoenix.LiveView
@@ -78,7 +76,9 @@ defmodule SlaxWeb.ChatRoomLive.Index do
       |> Chat.get_room!()
       |> Chat.toggle_room_membership(socket.assigns.current_user)
 
-    {:noreply, stream_insert(socket, :rooms, {room, joined?})}
+    socket
+    |> stream_insert(:rooms, {room, joined?})
+    |> noreply()
   end
 
   defp open_room(room) do

lib/slax_web/live/socket_helpers.ex

@@ -0,0 +1,9 @@
+defmodule SlaxWeb.SocketHelpers do
+  @moduledoc """
+  Helper functions to encapsulate a socket into proper tuples.
+  """
+
+  def ok(socket), do: {:ok, socket}
+
+  def noreply(socket), do: {:noreply, socket}
+end