elixir_example.ex

defmodule PuzzledPintScriptElixir do
  HTTPotion.start
  defp get_file_strings do
    File.read! "/usr/share/dict/cracklib-small"
  end

  def list_of_urls do
    base_string = "http://www.puzzledpint.com/puzzles/august-2015/semaphore/"
    list_of_words = get_file_strings
    list_of_lines = String.split(list_of_words, "\n", trim: true)
    filtered_words = Enum.filter(list_of_lines, fn x -> String.length(x) == 7 end)
    Enum.map(filtered_words, fn x -> base_string <> x end)
  end

  def pmap_printer_func(collection, fun, condition_func) do
    me = self
    collection
    |> Enum.map(fn (elem) ->
                   :timer.sleep(200)
      spawn_link fn -> (send me, {self, [ fun.(elem), elem ] }) end
    end)
    |> Enum.map(fn (pid) ->
      receive do {^pid, result} ->
          if condition_func.(result[0]) do
            IO.puts(result[1])
          end
          result end
        end)
    end

  def getter_func(url) do
    IO.puts url
    HTTPotion.get url
    
  end

  def condition_function(response) do
    response.status_code == 404
  end

  def main do
    pmap_printer_func(list_of_urls, &getter_func/1, &condition_function/1)
  end
end

Timeouts in code:

=ERROR REPORT==== 16-Nov-2015::22:43:23 ===
Error in process <0.244.0> with exit value:
{#{'__exception__' => true,
   '__struct__' => 'Elixir.HTTPotion.HTTPError',
   message => <<"req_timedout">>},
 [{'Elixir.HTTPotion',handle_response,1,
      [{file,"lib/httpotion.ex"},{line,209}]},
  {'Elixir.PuzzledPintScriptElixir','-pmap_printer_func/3-fun-0-',3,
      [{file,"lib/puzzled_pint_script_elixir.ex"},{line,20}]}]}
** (EXIT from #PID<0.213.0>) an exception was raised:
    ** (HTTPotion.HTTPError) req_timedout
        (httpotion) lib/httpotion.ex:209: HTTPotion.handle_response/1
        (puzzled_pint_script_elixir) lib/puzzled_pint_script_elixir.ex:20: anonymous fn/3 in PuzzledPintScriptElixir.pmap_printer_func/3