Add local dev server mix task for developing against heimdall (#10)

lib/marathon/binge_watch.ex

@@ -143,7 +143,7 @@ defmodule Heimdall.Marathon.BingeWatch do
     end
   end
 
-  defp register_routes(routes) do
+  def register_routes(routes) do
     DynamicRoutes.unregister_all(:heimdall_routes)
     Enum.each routes, fn {host, path, plug, opts} ->
       DynamicRoutes.register(:heimdall_routes, host, path, plug, opts)

lib/mix/dev_server.ex

@@ -0,0 +1,53 @@
+defmodule Mix.Tasks.DevServer do
+  @moduledoc false
+  use Mix.Task
+
+  def filters(plugs) do
+    plugs
+    |> String.split(",")
+    |> Poison.encode!
+  end
+
+  def options(opts) do
+    opts
+    |> String.split(",")
+    |> Enum.map(&String.split(&1, "="))
+    |> Enum.map(fn [k, v | _] -> {k, v} end)
+    |> Enum.into(%{})
+    |> Poison.encode!()
+  end
+
+  def routes_from_args(args) do
+    cond do
+      length(args) == 0 -> []
+      length(args) < 4 ->
+        IO.puts "Not enough parameters for args:"
+        IO.inspect args
+        []
+      true ->
+        [host, path, plugs, opts | tail] = args
+        app = %{
+          "labels" => %{
+            "heimdall.host" => host,
+            "heimdall.path" => path,
+            "heimdall.filters" => filters(plugs),
+            "heimdall.options" => options(opts)
+          }
+        }
+        [app] ++ routes_from_args(tail)
+    end
+  end
+
+  def run(args) do
+    Mix.Config.persist(heimdall: [register_marathon: false])
+    Mix.Task.run "app.start", []
+    routes =
+      args
+      |> routes_from_args
+      |> Heimdall.Marathon.BingeWatch.build_routes
+      |> Heimdall.Marathon.BingeWatch.register_routes
+    IO.puts "Registered routes:"
+    IO.inspect routes
+    :timer.sleep(:infinity)
+  end
+end

lib/plug/no_op.ex

@@ -0,0 +1,8 @@
+defmodule Heimdall.Plug.NoOp do
+  @moduledoc """
+  A plug that does nothing.
+  """
+
+  def init(opts), do: opts
+  def call(conn, _opts), do: conn
+end