From 0cbdf465e49e4bc6a4625d0610fa73f9b469a39d Mon Sep 17 00:00:00 2001
From: euxane <euxane.trangirard@euxane.eu>
Date: Mon, 19 May 2025 16:36:50 +0200
Subject: [PATCH] dovecot/fts: warn on stopwords filter with multiple languages

---
 mail-server/dovecot.nix | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/mail-server/dovecot.nix b/mail-server/dovecot.nix
index ee8db25..56cebf2 100644
--- a/mail-server/dovecot.nix
+++ b/mail-server/dovecot.nix
@@ -153,6 +153,20 @@ in
       }
     ];
 
+    warnings =
+      (lib.optional (
+        (builtins.length cfg.fullTextSearch.languages > 1) &&
+        (builtins.elem "stopwords" cfg.fullTextSearch.filters)
+      ) ''
+        Using stopwords in `mailserver.fullTextSearch.filters` with multiple
+        languages in `mailserver.fullTextSearch.languages` configured WILL
+        cause some searches to fail.
+
+        The recommended solution is to NOT use the stopword filter when
+        multiple languages are present in the configuration.
+      '')
+    ;
+
     # for sieve-test. Shelling it in on demand usually doesnt' work, as it reads
     # the global config and tries to open shared libraries configured in there,
     # which are usually not compatible.