add .formatter.exs + format

lib/tracker.ex

@@ -2,9 +2,9 @@ defmodule Tracker do
   alias __MODULE__
 
   defstruct total: 0,
-    koans: MapSet.new(),
-    visited_modules: MapSet.new(),
-    on_complete: :noop
+            koans: MapSet.new(),
+            visited_modules: MapSet.new(),
+            on_complete: :noop
 
   def start_link do
     Agent.start_link(fn -> %Tracker{} end, name: __MODULE__)
@@ -15,15 +15,17 @@ defmodule Tracker do
   end
 
   def set_total(modules) do
-    total = modules
-    |> Enum.flat_map(&(&1.all_koans))
-    |> Enum.count
+    total =
+      modules
+      |> Enum.flat_map(& &1.all_koans)
+      |> Enum.count()
 
     Agent.update(__MODULE__, fn _ -> %Tracker{total: total} end)
   end
 
   def completed(module, koan) do
     Agent.update(__MODULE__, &mark_koan_completed(&1, module, koan))
+
     if complete?() do
       Agent.cast(__MODULE__, fn state ->
         send(state.on_complete, {self(), :complete})
@@ -34,14 +36,18 @@ defmodule Tracker do
 
   def wait_until_complete() do
     pid = Process.whereis(Tracker)
+
     receive do
       {^pid, :complete} -> :ok
     end
   end
 
   defp mark_koan_completed(state, module, koan) do
-    %{state | koans: MapSet.put(state.koans, koan),
-       visited_modules: MapSet.put(state.visited_modules, module)}
+    %{
+      state
+      | koans: MapSet.put(state.koans, koan),
+        visited_modules: MapSet.put(state.visited_modules, module)
+    }
   end
 
   def visited do
@@ -54,7 +60,7 @@ defmodule Tracker do
   end
 
   def summarize do
-    state = Agent.get(__MODULE__, &(&1))
+    state = Agent.get(__MODULE__, & &1)
 
     %{
       total: state.total,