Extracts modules for different sections of the UI

lib/display/progress_bar.ex

@@ -0,0 +1,18 @@
+defmodule Display.ProgressBar do
+  @progress_bar_length 30
+
+  def progress_bar(%{current: current, total: total}) do
+    arrow = caluculate_progress(current, total) |> build_arrow
+
+    "|" <> String.ljust(arrow, @progress_bar_length) <> "| #{current} of #{total}"
+  end
+
+  defp caluculate_progress(current, total) do
+    round( (current/total) * @progress_bar_length)
+  end
+
+  defp build_arrow(0), do: ""
+  defp build_arrow(length) do
+    String.duplicate("=", length-1) <> ">"
+  end
+end