talking to the troll

lib/abcd.ex

@@ -4,8 +4,8 @@ defmodule ABCD.Fourletters do
   @doc """
   Start a new fourletters.
   """
-  def start_link(_opts) do
-    Agent.start_link(fn -> [] end)
+  def start_link(opts) do
+    Agent.start_link(fn -> opts end)
   end
 
   @doc """

lib/fourletters/application.ex

@@ -9,6 +9,8 @@ defmodule Fourletters.Application do
     children = [
       # Start the Telemetry supervisor
       FourlettersWeb.Telemetry,
+      # Start the letter troll
+      Fourletters.Troll,
       # Start the PubSub system
       {Phoenix.PubSub, name: Fourletters.PubSub},
       # Start the Endpoint (http/https)

lib/fourletters/troll.ex

@@ -0,0 +1,16 @@
+defmodule Fourletters.Troll do
+  use Supervisor
+  def start_link(arg) do
+    Supervisor.start_link(__MODULE__, arg, name: __MODULE__)
+  end
+
+  @impl true
+  def init(_arg) do
+    children = [
+      %{id: :butt, 
+        start: {ABCD.Fourletters, :start_link, [["yo"]]}}
+    ]
+
+    Supervisor.init(children, strategy: :one_for_one)
+  end
+end

lib/fourletters_web/controllers/fourletters_controller.ex

@@ -1,9 +1,20 @@
 defmodule FourlettersWeb.FourlettersController do
   use FourlettersWeb, :controller
+  import Fourletters.Troll
+  import ABCD.Fourletters
 
   def fourletters(conn, %{"messenger" => messenger}) do
     if String.length(messenger) == 4 do
-      render(conn, "four.html", messenger: messenger)
+
+      {:ok, sup_pid} = Supervisor.start_link(Fourletters.Troll, [])
+      pid = case Supervisor.start_child(
+                  sup_pid, %{id: String.to_atom(messenger),
+                             start: {ABCD.Fourletters, :start_link, [[]]}}) do
+        {:ok, pid} -> pid
+        {:error, {:already_started, pid}} -> pid
+      end
+      messages = ABCD.Fourletters.get(pid)
+      render(conn, "four.html", messenger: messenger, messages: messages)
     end
     redirect(conn, to: "/")
   end

lib/fourletters_web/templates/fourletters/four.html.eex

@@ -1 +1,2 @@
 <h1>hey <%= @messenger %></h1>
+<%= @messages %>