From 296dd1595915610fc7439fd95a66ed3ad2bc9703 Mon Sep 17 00:00:00 2001
From: Tomek Gryszkiewicz <grych@tg.pl>
Date: Fri, 22 Jun 2018 19:52:57 +0200
Subject: [PATCH] v0.8.3

---
 CHANGELOG.md       | 58 +++++++++++++++++++++++++++++++++++++++++++---
 lib/drab/config.ex |  2 ++
 2 files changed, 57 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d686d5..8b7fb60 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,9 +1,61 @@
 # CHANGELOG
 
 ## v0.8.3
-Subscribe and unsubscribe from external topics in a runtime.
-Presence.
-Updated behaviour of enable disable.
+
+This version brings two useful features: presence and ability to subscribe to topics in the runtime.
+
+### Upgrading from =< 0.8.2
+
+Please ensure you have set `:main_phoenix_app` in your `config.exs`. The way how Drab is searching
+for the Phoenix app it is working on, has been changed.
+
+### Subscribe and unsubscribe from external topics in a runtime
+
+Finally, you are not limited to the compile-time topic you’ve set with `broadcasting/1` macro in the
+commander. Now you can `subscribe/2` to the external topic, receiving broadcasts sent to it.
+
+```elixir
+subscribe(socket, same_action(MyApp.MyController, :index))
+subscribe(socket, same_topic("user_#{user_id}"))
+```
+
+### Presence
+
+Conveniences for Phoenix.Presence
+If configured (it is disabled by default), tracks the user presence on the topic. The following
+example shows the number of connected users, live:
+
+```elixir
+defmodule MyAppWeb.MyCommander
+  use Drab.Commander
+
+  broadcasting "global"
+  onconnect :connected
+  ondisconnect :disconnected
+
+  def connected(socket) do
+    broadcast_html socket, "#number_of_users", Drab.Presence.count_users(socket)
+  end
+
+  def disconnected(_store, _session) do
+    topic = same_topic("global")
+    broadcast_html topic, "#number_of_users", Drab.Presence.count_users(topic)
+  end
+end
+```
+
+By default, presence map key is set as a browser UUID (which is shamelessly stored in the local
+store in the browser), but it may be also any session value. This may be useful, if you have the
+`user_id` already in the session, just configure it:
+
+```elixir
+config :drab, :presence, id: :user_id
+```
+
+### Updated enable/disable when processing behaviour
+
+After launching an event from the page, the control (button) is disable until processing stops.
+Now it is even better, as it recognizes previously disabled controls (#146).
 
 ## v0.8.2
 
diff --git a/lib/drab/config.ex b/lib/drab/config.ex
index 3074677..4132e8c 100644
--- a/lib/drab/config.ex
+++ b/lib/drab/config.ex
@@ -87,6 +87,7 @@ defmodule Drab.Config do
     get(:main_phoenix_app) || find_app_in_mix_exs()
   end
 
+  @spec find_app_in_mix_exs :: atom | no_return
   defp find_app_in_mix_exs() do
     # try to find out the app name in config.exs, in compile time only
     with {:ok, pwd} <- Map.fetch(System.get_env(), "PWD"),
@@ -126,6 +127,7 @@ defmodule Drab.Config do
     get(:endpoint) || find_endpoint_in_app_env() || find_endpoint_in_config_exs()
   end
 
+  @spec endpoint :: atom
   defp find_endpoint_in_app_env() do
     case app_env() do
       [{ep, _}] -> ep