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mix_test_watch

0.0.1
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Automatically run tests when files change

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mix_test_watch lib mix_test_watch.ex
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lib/mix_test_watch.ex 

defmodule Mix.Tasks.Test.Watch do

  use Mix.Task

  use GenServer



  def run(_) do

    Application.start :fs

    GenServer.start_link( __MODULE__, [], name: __MODULE__ )

    :timer.sleep :infinity

  end





  def init(_) do

    :fs.subscribe

    {:ok, []}

  end



  def handle_info({_pid, {:fs, :file_event}, {path, _event}}, _) do

    path = to_string path

    if watching? path do run_tests end

    {:noreply, []}

  end





  defp watching?(path) do

    Regex.match?( ~r/\.exs?\z/i, path )

  end



  defp run_tests do

    # Mix.Tasks.Test.run []

    output = :os.cmd( mix_cmd )

    IO.puts to_string(output)

  end



  defp mix_cmd do

    enable_ansi = "Application.put_env(:elixir, :ansi_enabled, true);"

    set_mix_env = ~S[System.put_env("MIX_ENV", "test");]

    to_char_list  ~s[mix do run -e '#{enable_ansi} #{set_mix_env}', test]

  end

end