modules/lsp/server: rename config -> settings

`config` is a loaded term within modules and options.

`settings` is the name usually used for freeform config in nixvim and
most other module configurations.

modules/lsp/default.nix

@@ -93,7 +93,7 @@ in
       '';
       default = { };
       example = {
-        "*".config = {
+        "*".settings = {
           root_markers = [ ".git" ];
           capabilities.textDocument.semanticTokens = {
             multilineTokenSupport = true;
@@ -102,7 +102,7 @@ in
         luals.enable = true;
         clangd = {
           enable = true;
-          config = {
+          settings = {
             cmd = [
               "clangd"
               "--background-index"
@@ -127,6 +127,13 @@ in
         builtins.attrValues
         (builtins.filter (server: server.enable))
       ];
+
+      # Collect per-server warnings
+      serverWarnings = lib.pipe cfg.servers [
+        builtins.attrValues
+        (builtins.catAttrs "warnings")
+        builtins.concatLists
+      ];
     in
     {
       extraPackages = builtins.catAttrs "package" enabledServers;
@@ -137,10 +144,10 @@ in
             server:
             let
               luaName = toLuaObject server.name;
-              luaCfg = toLuaObject server.config;
+              luaSettings = toLuaObject server.settings;
             in
             ''
-              vim.lsp.config(${luaName}, ${luaCfg})
+              vim.lsp.config(${luaName}, ${luaSettings})
             ''
             + lib.optionalString server.activate ''
               vim.lsp.enable(${luaName})
@@ -158,5 +165,8 @@ in
         end
         -- }}}
       '';
+
+      # Propagate per-server warnings
+      warnings = lib.mkIf (serverWarnings != [ ]) serverWarnings;
     };
 }

modules/lsp/server.nix

@@ -2,9 +2,7 @@
 {
   name ? null,
   package ? null,
-  # Avoid naming conflict with the `config` module arg
-  # TODO: consider renaming the `config` option to something like `settings`?
-  configOption ? null,
+  settings ? null,
   pkgs ? { },
 }@args:
 { lib, name, ... }:
@@ -48,14 +46,14 @@ in
       '';
     };
 
-    config = lib.mkOption {
+    settings = lib.mkOption {
       type = with types; attrsOf anything;
       description = ''
-        Configurations for ${displayName}. ${configOption.extraDescription or ""}
+        Configurations for ${displayName}. ${settings.extraDescription or ""}
       '';
       default = { };
       example =
-        configOption.example or {
+        settings.example or {
           cmd = [
             "clangd"
             "--background-index"
@@ -70,5 +68,23 @@ in
           ];
         };
     };
+
+    # NOTE: we need a warnings option for `mkRenamedOptionModule` to warn about unexpected definitions
+    # This can be removed when all rename aliases are gone
+    warnings = lib.mkOption {
+      type = with types; listOf str;
+      description = "Warnings to propagate to nixvim's `warnings` option.";
+      default = [ ];
+      internal = true;
+      visible = false;
+    };
   };
+
+  imports = [
+    # TODO: rename added 2025-04-30 (during the 25.05 cycle)
+    # The previous name `config` was introduced 2025-04-28 (during the 25.05 cycle)
+    # Because the previous name `config` never made it into a stable release,
+    # we could consider dropping this alias sooner than normal.
+    (lib.mkRenamedOptionModule [ "config" ] [ "settings" ])
+  ];
 }