Extract turn_class function

lib/chess_web/templates/game/index.html.eex

@@ -3,7 +3,7 @@
 <table class="table">
   <tbody>
     <%= for game <- @games do %>
-      <tr class="<%= if your_turn?(@conn, game), do: "your-turn" %>">
+      <tr class="<%= turn_class(@conn, game) %>">
         <td>
           <span class="player-indicator"><img src="images/pawn_<%= player_colour(@conn, game) %>.svg"></span>
           <%= link "Game with #{opponent(@conn, game).name}", to: game_path(@conn, :show, game), class: "btn btn-default btn-xs" %>

lib/chess_web/views/game_view.ex

@@ -3,6 +3,12 @@ defmodule ChessWeb.GameView do
 
   import Chess.Auth, only: [current_user: 1]
 
+  def turn_class(conn, game) do
+    if your_turn?(conn, game) do
+      "your-turn"
+    end
+  end
+
   def your_turn?(conn, game) do
     player_colour(conn, game) == game.turn
   end