Adds to_event support for arbitrary structs

Signed-off-by: João Ferreira <[email protected]>

Author: jmnsf

lib/timber/eventable.ex

@@ -49,6 +49,8 @@ defimpl Timber.Eventable, for: Map do
 end
 
 defimpl Timber.Eventable, for: Any do
+  @upper_word_regex ~r/(^[A-Z]+$)|[A-Z][a-z0-9]*/
+
   def to_event(%{__exception__: true} = error) do
     message = Exception.message(error)
     module_name = Timber.Utils.Module.name(error.__struct__)
@@ -60,4 +62,19 @@ defimpl Timber.Eventable, for: Any do
       }
     }
   end
+
+  def to_event(%{__struct__: module} = struct) do
+    event_data = struct |> Map.from_struct()
+
+    event_namespace =
+      module
+      |> Module.split()
+      |> List.last()
+      |> String.split(@upper_word_regex, trim: true, include_captures: true)
+      |> Stream.map(&String.downcase/1)
+      |> Enum.join("_")
+      |> String.to_atom()
+
+    Map.new([{event_namespace, event_data}])
+  end
 end

test/lib/timber/eventable_test.exs

@@ -1,7 +1,7 @@
 defmodule Timber.EventableTest do
   use Timber.TestCase
 
-  alias Timber.Eventable
+  alias Timber.{Eventable, TestStruct}
 
   describe "Timber.Eventable.to_event/1" do
     test "map with a single root key" do
@@ -31,5 +31,14 @@ defmodule Timber.EventableTest do
                }
              }
     end
+
+    test "struct" do
+      struct = %TestStruct{}
+      event = Eventable.to_event(struct)
+
+      assert event == %{
+        test_struct: %{life: 42}
+      }
+    end
   end
 end

test/support/test_struct.ex

@@ -0,0 +1,4 @@
+defmodule Timber.TestStruct do
+  @moduledoc false
+  defstruct [life: 42]
+end