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mix_test_watch

0.1.0
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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(args) do

    args = Enum.join(args, " ")

    Application.start :fs, :permanent

    Application.start :porcelain, :permanent

    GenServer.start_link( __MODULE__, args, name: __MODULE__ )

    :timer.sleep :infinity

  end







  def init(args) do

    :fs.subscribe

    {:ok, %{ args: args }}

  end



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

    if watching?( to_string path ) do

      run_tests( state.args )

    end

    {:noreply, state}

  end







  defp watching?(path) do

    Regex.match?( ~r/\.e(ex|xs?)\z/i, path )

  end



  defp run_tests(args) do

    IO.puts "\nRunning tests..."

    Porcelain.shell( mix_cmd(args), out: IO.stream(:stdio, :line) )

  end



  defp mix_cmd(args) do

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

    ~s[MIX_ENV=test mix do run -e '#{ansi}', test #{args}]

  end

end