josevalim

%% -*- erlang-indent-level: 4 -*-
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2014. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be

josevalim

defmodule Rocket.DateTime do
  def type, do: :datetime

  # Provide our own casting rules.
  def cast(string) when is_binary(string) do
    # Try to parse different formats here
  end

  # Datetime itself should also be valid
  def cast(%Ecto.DateTime{} = datetime) do

josevalim

"foo bar baz"
|> Stream.unfold(fn
      ""  -> nil;
      acc ->
        case String.split(acc, " ", parts: 2) do
          [left, right] -> {left, right}
          [left]        -> {left, ""}
        end
   end)
|> Enum.take(2)

josevalim

defmodule Exq.RouterPlug do
  import Plug.Conn
  use Plug.Router

  plug :match
  plug :dispatch

  get "/queues" do
    IO.puts "YOLO"
    conn |> halt()

josevalim

+ EPMD
  - Distributed systems are cool
  - Distributed systems are also complex
  - First step: How to find other machines (and nodes) in the same network
    - Erlang Port Mapper Daemon

+ EPMD in C
  - Ships with Erlang
  - is a TCP server
  - usually 4369

josevalim

defmodule Parsec do
  # Handles parsec for ..., do: ...
  defmacro parsec({:for, _, args}) do
    {exprs, [[do: return]]} = Enum.split(args, -1)
    do_parsec(exprs, return)
  end

  # Handles parsec for ... do ... end
  defmacro parsec({:for, _, args}, do: return) do
    do_parsec(args, return)

josevalim

iex(2)> import Supervisor.Spec
nil
iex(3)> Supervisor.start_link([worker(Task, [fn -> Process.register(self, :hello); :timer.sleep(:infinity) end])], strategy: :one_for_one)
{:ok, #PID<0.61.0>}
iex(4)> Process.whereis(:hello)
#PID<0.62.0>
iex(5)> Process.exit(self(), :shutdown)
** (EXIT from #PID<0.57.0>) shutdown

Interactive Elixir (0.15.2-dev) - press Ctrl+C to exit (type h() ENTER for help)

josevalim

iex(1)> defmodule Foo do
...(1)> use GenEvent
...(1)> end
{:module, Foo,
 <<70, 79, 82, 49, 0, 0, 8, 144, 66, 69, 65, 77, 69, 120, 68, 99, 0, 0, 2, 7, 131, 104, 2, 100, 0, 14, 101, 108, 105, 120, 105, 114, 95, 100, 111, 99, 115, 95, 118, 49, 108, 0, 0, 0, 2, 104, 2, 100, 0, 4, ...>>,
 [true, true, true, true, true, true]}
iex(2)> {:ok, pid} = GenEvent.start_link
{:ok, #PID<0.50.0>}
iex(3)> GenEvent.add_handler(pid, Foo, [])
:ok

josevalim

@proto_version "1.0"

def process_options(opts) do
  ret = []
  if opts[:in], do: ret = ["-in"|ret]

  case opts[:err] do
    :out -> ret = ["-err", "out"|ret]
    :err -> ret = ["-err", "err"|ret]
    _ -> nil

josevalim

=ERROR REPORT==== 12-Jun-2014::15:23:03 ===
** Task <0.38.0> terminating
** Reason for termination ==
** {badarg,[{erlang,hd,[[]],[]},
            {'Elixir.Agent.Server',handle_call,3,
                                   [{file,"lib/agent/server.ex"},{line,11}]},
            {gen_server,handle_msg,5,[{file,"gen_server.erl"},{line,580}]},
            {proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,239}]}]}