Add option to configure pins

Author: LivInAbsurdism

lib/delux/application.ex

@@ -8,6 +8,8 @@ defmodule Delux.Application do
     # Optionally start Delux if configured in the application
     # environment
 
+    apply_dt_overlays()
+
     children =
       case Application.get_all_env(:delux) do
         [] -> []
@@ -17,4 +19,13 @@ defmodule Delux.Application do
     opts = [strategy: :one_for_one, name: Delux.Supervisor]
     Supervisor.start_link(children, opts)
   end
+
+  def apply_dt_overlays do
+    config = Application.get_env(:delux, :dt_overlays, [])
+
+    Enum.each(config[:pins] || [], fn {label, pin} ->
+      args = [config[:overlays_path], "label=#{label}", "gpio=#{pin}"]
+      System.cmd("dtoverlay", args)
+    end)
+  end
 end