defmodule ElixirScript.Watcher do

use GenServer

require Logger

@moduledoc """

Watches the input folder for changes and calls the ElixirScript compiler

"""

def start_link(input, options) do

GenServer.start_link(__MODULE__, [input: input, options: options])

end

def init(args) do

{:ok, _} = Application.ensure_all_started(:elixir_script)

{:ok, _} = Application.ensure_all_started(:fs)

:fs.subscribe()

{:ok, args}

end

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

try do

if input_changed?(to_string(path), state) do

Logger.debug "Event: #{inspect event} Path: #{path}"

ElixirScript.compile_path(state[:input], state[:options])

end

rescue

x ->

Logger.error(x.message)

end

{:noreply, state}

end

defp input_changed?(path, state) do

file = Path.basename(path)

case file do

"." <> _ ->

false

_ ->

Enum.any?(List.wrap(state[:input]), fn(x) ->

path == Path.absname(Path.join([x, file]))

end)

end

end

end