From f231313b709cef32611927cabd8cadb5b0787dc5 Mon Sep 17 00:00:00 2001
From: lain <lain@soykaf.club>
Date: Mon, 28 Jan 2019 12:09:41 +0100
Subject: [PATCH] Add deprecation warning mechanism.

---
 lib/pleroma/application.ex          |  2 ++
 lib/pleroma/deprecation_warnings.ex | 20 ++++++++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100644 lib/pleroma/deprecation_warnings.ex

diff --git a/lib/pleroma/application.ex b/lib/pleroma/application.ex
index ad2797209..f63477934 100644
--- a/lib/pleroma/application.ex
+++ b/lib/pleroma/application.ex
@@ -22,6 +22,8 @@ def user_agent() do
   def start(_type, _args) do
     import Cachex.Spec
 
+    Task.start(&Pleroma.DeprecationWarnings.warn/0)
+
     # Define workers and child supervisors to be supervised
     children =
       [
diff --git a/lib/pleroma/deprecation_warnings.ex b/lib/pleroma/deprecation_warnings.ex
new file mode 100644
index 000000000..abb649919
--- /dev/null
+++ b/lib/pleroma/deprecation_warnings.ex
@@ -0,0 +1,20 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.DeprecationWarnings do
+  require Logger
+
+  def check_frontend_config_mechanism() do
+    if Pleroma.Config.get(:fe) do
+      Logger.warn("""
+      !!!DEPRECATION WARNING!!!
+      You are using the old configuration mechanism for the frontend. Please check config.md.
+      """)
+    end
+  end
+
+  def warn do
+    check_frontend_config_mechanism()
+  end
+end