[Enhancement] Show currently executing jobs on homepage (#250)

* [WIP] Added PoC job table

* [WIP] hooked up tasks table with real data

* Added reload on websocket command

* Hooked it all up to a websocket

lib/pinchflat/tasks/tasks_query.ex

@@ -0,0 +1,45 @@
+defmodule Pinchflat.Tasks.TasksQuery do
+  @moduledoc """
+  Query helpers for the Tasks context.
+
+  These methods are made to be one-ish liners used
+  to compose queries. Each method should strive to do
+  _one_ thing. These don't need to be tested as
+  they are just building blocks for other functionality
+  which, itself, will be tested.
+  """
+  import Ecto.Query, warn: false
+
+  alias Pinchflat.Tasks.Task
+
+  # This allows the module to be aliased and query methods to be used
+  # all in one go
+  # usage: use Pinchflat.Tasks.TasksQuery
+  defmacro __using__(_opts) do
+    quote do
+      import Ecto.Query, warn: false
+
+      alias unquote(__MODULE__)
+    end
+  end
+
+  def new do
+    Task
+  end
+
+  def join_job(query) do
+    query
+    |> join(:left, [t], j in assoc(t, :job))
+    |> preload([t, j], job: j)
+  end
+
+  def in_state(states) when is_list(states) do
+    dynamic([t, j], j.state in ^states)
+  end
+
+  def in_state(state), do: in_state([state])
+
+  def has_tag(tag) do
+    dynamic([t, j], ^tag in j.tags)
+  end
+end