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exd lib exd plugin.ex
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lib/exd/plugin.ex 

defmodule Exd.Plugin do

  @moduledoc """

  Defines helpers from both built-in and external Exd plugins



  ## Usage

    # inside config.exs

    config :exd,

      plugins: [

        Exd.Plugin.HTML,

        Exd.Plugin.XML

      ]

  """

  require Logger



  # Default plugins

  use Exd.Plugin.String

  use Exd.Plugin.Integer

  use Exd.Plugin.Boolean

  use Exd.Plugin.List

  use Exd.Plugin.Fetch



  def load_plugin do

    Application.get_env(:exd, :plugin) || __MODULE__

  end



  def from(expr) do

    raise ArgumentError, message: "No plugin matches expression: #{inspect expr}"

  end



  def select(row, key, expr) do

    raise ArgumentError, message: "No plugin matches expression: #{inspect expr}"

  end



  def apply(expr) do

    raise ArgumentError, message: "No plugin matches expression: #{inspect expr}"

  end



  defmacro __using__(_opts) do

    quote do

      # Default plugins

      use Exd.Plugin.String

      use Exd.Plugin.Integer

      use Exd.Plugin.Boolean

      use Exd.Plugin.List

    end

  end



end