Defining Phoenix Template Path Fallback

nectar-web-dynamic-template-path.ex

# Refer https://github.com/phoenixframework/phoenix/blob/master/lib/phoenix/view.ex#L136
# For inspiration and implementation
defmodule Nectar.Web do  
  def view do
    quote do
      import unquote(__MODULE__), only: [template_root_folder: 1]
      use Phoenix.View, root: template_root_folder(__MODULE__)
      ...
    end
  end
  
  @priority_root "../templates/"
  @default_root "lib/web/templates"
  def template_root_folder(module) do
    namespace =
      module
      |> Module.split
      |> Enum.take(1)
      |> Module.concat

    priority_path =
      Path.join(@priority_root, Phoenix.Template.module_to_template_root(module, namespace, "View"))

    if File.exists? priority_path do
      @priority_root
    else
      @default_root
    end
  end
end