Add Omnibot.Module

Modules can easily be defined with `use Omnibot.Module`.
Omnibot.Contrib.Fortune has been updated to use this.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

lib/contrib/fortune.ex

@@ -1,7 +1,5 @@
 defmodule Omnibot.Contrib.Fortune do
-  use GenServer
-  alias Omnibot.Irc
-  require Logger
+  use Omnibot.Module
 
   @fortunes [
     "Reply hazy, try again",
@@ -21,10 +19,6 @@ defmodule Omnibot.Contrib.Fortune do
 
   ## Client API
 
-  def start_link(opts) do
-    GenServer.start_link(__MODULE__, opts[:cfg], opts)
-  end
-
   def privmsg(module, channel, nick, line) do
     GenServer.cast(module, {:privmsg, {channel, nick, line}})
   end
@@ -32,26 +26,11 @@ defmodule Omnibot.Contrib.Fortune do
   ## Server callbacks
 
   @impl true
-  def init(cfg) do
-    #Logger.debug("Starting fortune module")
-    #IO.inspect(self())
-    {:ok, cfg}
-  end
-
-  @impl true
-  def handle_call(:unload, _from, cfg) do
-    Logger.info("Unloading")
-    {:reply, :ok, cfg}
-  end
-
-  @impl true
-  def handle_cast({:privmsg, {channel, nick, line}}, cfg) do
-    if IO.inspect(line) == "!fortune" do
+  def on_channel_msg(channel, nick, line) do
+    if line == "!fortune" do
       fortune = Enum.random(@fortunes)
       reply = "#{nick}: #{fortune}"
-      Irc.send_to(Irc, channel, reply)
+      Irc.send_to(channel, reply)
     end
-
-    {:noreply, cfg}
   end
 end