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francis

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Boilerplate killer using Plug with Bandit to quickly build endpoints, websocket and SSE listeners

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francis lib watcher.ex
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lib/watcher.ex 

defmodule Francis.Watcher do

  @moduledoc """

  Watcher mode for development that checks modified time of your files and recompiles them

  """

  use GenServer

  require Logger



  def start_link(_) do

    GenServer.start_link(__MODULE__, %{files: %{}})

  end



  def init(state) do

    Logger.debug("Development watch mode enabled")

    Code.put_compiler_option(:ignore_module_conflict, true)

    Process.send_after(self(), :check, 100)

    {:ok, state}

  end



  def handle_info(:check, %{files: files} = state) do

    files =

      Enum.reduce(Path.wildcard("./**/*.{ex,exs}"), files, fn path, files ->

        new_mtime = File.stat!(path).mtime



        case Map.get(files, path) do

          mtime when not is_nil(mtime) and new_mtime != mtime -> Code.eval_file(path)

          _ -> nil

        end



        Map.put(files, path, File.stat!(path).mtime)

      end)



    Process.send_after(self(), :check, 100)

    {:noreply, %{state | files: files}}

  end

end