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ScoutAPM agent for Phoenix & Elixir projects. For more information, visit https://www.scoutapm.com/agents/elixir-phoenix-monitoring.

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scout_apm lib scout_apm instruments eex_engine.ex
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lib/scout_apm/instruments/eex_engine.ex 

defmodule ScoutApm.Instruments.EExEngine do

  @behaviour Phoenix.Template.Engine



  # TODO: Make this name correctly for other template locations

  # Currently it assumes too much about being located under `web/templates`

  def compile(path, name) do

    # web/templates/page/index.html.eex

    scout_name =

      path

      # [web, templates, page, index.html.eex]

      |> String.split("/")

      # [page, index.html.eex]

      |> Enum.drop(2)

      # "page/index.html.eex"

      |> Enum.join("/")



    # Since we only have a single layer of nesting currently, and

    # practically every template will be "under" a layout, don't let the

    # layout become the scope. Once we have deeper nesting, we'll want

    # to allow layouts as scopable layers.

    is_layout = String.starts_with?(scout_name, "layout")



    quoted_template = Phoenix.Template.EExEngine.compile(path, name)



    quote do

      require ScoutApm.Tracing



      ScoutApm.Tracing.timing("EEx", unquote(path), [scopable: !unquote(is_layout)],

        do: unquote(quoted_template)

      )

    end

  end

end