use Config in generated config when available

Mix.Config is deprecated and does not work on OTP releases. However
we can't fully switch to Config because it is not present in
Elixir < 1.9. I tried to evaluate if Config is available at runtime,
but for some weird reason OTP releases crash if I do that.

diff --git a/priv/templates/sample_config.eex b/priv/templates/sample_config.eex
index 8b45acb05b6eb7c625fb819d7d463c145be0f4c3..526593d0a87f7049ada1730966febf1a01d8b291 100644 (file)
--- a/priv/templates/sample_config.eex
+++ b/priv/templates/sample_config.eex
@@ -3,7 +3,11 @@
 # NOTE: This file should not be committed to a repo or otherwise made public
 # without removing sensitive information.
 
-use Mix.Config
+<%= if Code.ensure_loaded?(Config) do
+  "import Config"
+else
+  "use Mix.Config"
+end %>
 
 config :pleroma, Pleroma.Web.Endpoint,
    url: [host: "<%= domain %>", scheme: "https", port: <%= port %>],