Merge pull request #3 from ck3g/agent_robot

Use an agent to keep the robot's state

lib/agent_robot.ex

@@ -0,0 +1,17 @@
+defmodule ToyRobot.AgentRobot do
+  def place do
+    {:ok, state} = ToyRobot.place
+    {:ok, pid} = Agent.start(fn -> state end, name: __MODULE__)
+    pid
+  end
+
+  def move, do: Agent.update(__MODULE__, &(ToyRobot.move(&1)))
+
+  def left, do: Agent.update(__MODULE__, &(ToyRobot.left(&1)))
+
+  def right, do: Agent.update(__MODULE__, &(ToyRobot.right(&1)))
+
+  def report do
+    Agent.get(__MODULE__, &(&1)) |> ToyRobot.report
+  end
+end