Notifications on event update

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/mobilizon_web/email/email.ex

@@ -11,7 +11,8 @@ defmodule MobilizonWeb.Email do
   def base_email(args) do
     instance = Config.instance_config()
 
-    new_email(args)
+    args
+    |> new_email()
     |> from(Config.instance_email_from())
     |> put_header("Reply-To", Config.instance_email_reply_to())
     |> assign(:instance, instance)

lib/mobilizon_web/email/event.ex

@@ -0,0 +1,43 @@
+defmodule MobilizonWeb.Email.Event do
+  @moduledoc """
+  Handles emails sent about events.
+  """
+
+  use Bamboo.Phoenix, view: MobilizonWeb.EmailView
+
+  import Bamboo.Phoenix
+
+  import MobilizonWeb.Gettext
+
+  alias Mobilizon.Events.Event
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Users.User
+  alias MobilizonWeb.Email
+
+  @spec event_updated(User.t(), Actor.t(), Event.t(), Event.t(), list(), String.t()) ::
+          Bamboo.Email.t()
+  def event_updated(
+        %User{} = user,
+        %Actor{} = actor,
+        %Event{} = old_event,
+        %Event{} = event,
+        changes,
+        locale \\ "en"
+      ) do
+    Gettext.put_locale(locale)
+
+    subject =
+      gettext(
+        "Event %{title} has been updated",
+        title: old_event.title
+      )
+
+    Email.base_email(to: {Actor.display_name(actor), user.email}, subject: subject)
+    |> assign(:locale, locale)
+    |> assign(:event, event)
+    |> assign(:old_event, old_event)
+    |> assign(:changes, changes)
+    |> assign(:subject, subject)
+    |> render(:event_updated)
+  end
+end