From 81564b5e46429f49f38c9daf723818bb84dd0fa8 Mon Sep 17 00:00:00 2001
From: siggsy <siggsy@placz.net>
Date: Sun, 19 Oct 2025 18:28:00 +0200
Subject: [PATCH] languages/haskell: add warnings about DAP

DAP is currently configured with haskell-tools, which
causes haskell-tools languages server to also be enabled.
Show a warning to inform the user.
---
 modules/plugins/languages/haskell.nix | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/modules/plugins/languages/haskell.nix b/modules/plugins/languages/haskell.nix
index 0f6b26c3..ec2fe86a 100644
--- a/modules/plugins/languages/haskell.nix
+++ b/modules/plugins/languages/haskell.nix
@@ -44,6 +44,7 @@
     haskell-tools =
       serverCommon
       // {
+        # haskell-tools is already started by haskell-tools.nvim via ftplugin
         enable = false;
         on_attach =
           mkLuaInline
@@ -111,6 +112,16 @@ in {
         cfg.lsp.servers;
     })
 
+    (mkIf (cfg.dap.enable && cfg.lsp.enable && !elem "haskell-tools" cfg.lsp.servers) {
+      warnings = [
+        (
+          "You appear to have enabled vim.languages.haskell.dap, which implicitly "
+          + "causes haskell-tools-nvim plugin to be added. Make sure you also add "
+          + "'haskell-tools' server to vim.languages.haskell.lsp.servers"
+        )
+      ];
+    })
+
     (mkIf (cfg.dap.enable || (cfg.lsp.enable && elem "haskell-tools" cfg.lsp.servers)) {
       vim = {
         startPlugins = ["haskell-tools-nvim"];