Use bare /play to resume playback

This replaces the /resume command since most people don't think "pause
and resume" as much as "play and pause".

lib/sergei/consumer.ex

@@ -11,15 +11,14 @@ defmodule Sergei.Consumer do
   end
 
   @play_opts [
-    opt.(3, "url", "URL of the audio to play", required: true)
+    opt.(3, "url", "URL of the audio to play", [])
   ]
 
   @slash_commands [
     {"ping", "Pong", []},
-    {"play", "Play some tunes", @play_opts},
-    {"stop", "Stop media playback and leave the voice channel", []},
+    {"play", "Play a song or resume playback", @play_opts},
     {"pause", "Pause media playback", []},
-    {"resume", "Resume media playback", []}
+    {"stop", "Stop media playback and leave the voice channel", []}
   ]
 
   def start_link do
@@ -89,15 +88,11 @@ defmodule Sergei.Consumer do
   end
 
   # /play <url>
-  def do_command(
-        %{
+  def do_command(%{
         guild_id: guild_id,
         member: %{user: %{id: invoker_id}},
-          data: %{name: "play", options: opts}
-        } = _interaction
-      ) do
-    [%{name: "url", value: url}] = opts
-
+        data: %{name: "play", options: [%{name: "url", value: url}]}
+      }) do
     case Sergei.VoiceStateCache.get_state(invoker_id) do
       %{guild_id: id} = _res when guild_id != id ->
         {:error, "You're not connected to a voice channel in this server."}
@@ -110,17 +105,17 @@ defmodule Sergei.Consumer do
     end
   end
 
-  # /stop
-  def do_command(%{guild_id: guild_id, data: %{name: "stop"}}) do
-    case Sergei.Player.stop(guild_id) do
+  # /play
+  def do_command(%{guild_id: guild_id, data: %{name: "play"}}) do
+    case Sergei.Player.resume(guild_id) do
       :ok ->
-        {:ok, "Bye!"}
+        {:ok, "Resuming playback..."}
 
       :not_playing ->
         {:ok, "I'm not playing anything right now."}
 
       {:error, err} ->
-        Logger.error("Failed to stop media: #{err}")
+        Logger.error("Failed to resume media: #{err}")
         {:error, "This is embarrasing..."}
     end
   end
@@ -140,17 +135,17 @@ defmodule Sergei.Consumer do
     end
   end
 
-  # /resume
-  def do_command(%{guild_id: guild_id, data: %{name: "resume"}}) do
-    case Sergei.Player.resume(guild_id) do
+  # /stop
+  def do_command(%{guild_id: guild_id, data: %{name: "stop"}}) do
+    case Sergei.Player.stop(guild_id) do
       :ok ->
-        {:ok, "Resuming..."}
+        {:ok, "Bye!"}
 
       :not_playing ->
         {:ok, "I'm not playing anything right now."}
 
       {:error, err} ->
-        Logger.error("Failed to resume media: #{err}")
+        Logger.error("Failed to stop media: #{err}")
         {:error, "This is embarrasing..."}
     end
   end

lib/sergei/player.ex

@@ -20,11 +20,6 @@ defmodule Sergei.Player do
     GenServer.call(__MODULE__, {:play, guild_id, channel_id, url})
   end
 
-  @spec stop(integer()) :: :ok | :not_playing | {:error, String.t()}
-  def stop(guild_id) do
-    GenServer.call(__MODULE__, {:stop, guild_id})
-  end
-
   @spec pause(integer()) :: :ok | :not_playing | {:error, String.t()}
   def pause(guild_id) do
     GenServer.call(__MODULE__, {:pause, guild_id})
@@ -35,6 +30,11 @@ defmodule Sergei.Player do
     GenServer.call(__MODULE__, {:resume, guild_id})
   end
 
+  @spec stop(integer()) :: :ok | :not_playing | {:error, String.t()}
+  def stop(guild_id) do
+    GenServer.call(__MODULE__, {:stop, guild_id})
+  end
+
   # Server
   @impl true
   def handle_info(:tick, state) do
@@ -67,14 +67,6 @@ defmodule Sergei.Player do
     {:reply, :not_playing, state}
   end
 
-  @impl true
-  def handle_call({:stop, guild_id}, _from, state) do
-    Voice.stop(guild_id)
-    Voice.leave_channel(guild_id)
-
-    {:reply, :ok, Map.delete(state, guild_id)}
-  end
-
   @impl true
   def handle_call({:pause, guild_id}, _from, state) do
     %{url: url} = Map.fetch!(state, guild_id)
@@ -103,6 +95,14 @@ defmodule Sergei.Player do
     {:reply, :ok, state}
   end
 
+  @impl true
+  def handle_call({:stop, guild_id}, _from, state) do
+    Voice.stop(guild_id)
+    Voice.leave_channel(guild_id)
+
+    {:reply, :ok, Map.delete(state, guild_id)}
+  end
+
   def play_music(guild_id, channel_id, url) do
     cond do
       Voice.get_channel_id(guild_id) != channel_id ->