modules/lsp: declare a stripped down servers."*" option

`"*"` is effectively a meta server, where shared config/defaults can be
set.

It shouldn't have options like `activate` or `package` which relate to
"real" servers. Therefore, we'll use `server-base.nix` directly, instead
of the full `server.nix` module.

modules/lsp/default.nix

@@ -75,10 +75,40 @@ in
     };
 
     servers = lib.mkOption {
-      type = types.submodule {
-        freeformType = types.attrsOf (mkServerType { });
-        options = builtins.mapAttrs mkServerOption serverPackages;
-      };
+      type = types.submodule [
+        {
+          freeformType = types.attrsOf (mkServerType { });
+        }
+        {
+          options = builtins.mapAttrs mkServerOption serverPackages;
+        }
+        {
+          # `*` is effectively a meta server, where shared config & defaults can be set.
+          # It shouldn't have options like `activate` or `package` which relate to "real" servers.
+          # Therefore, we'll use `server-base.nix` directly, instead of the full `server.nix` module.
+          options."*" = lib.mkOption {
+            description = ''
+              Global configuration applied to all language servers.
+            '';
+            type = types.submodule (
+              lib.modules.importApply ./server-base.nix {
+                displayName = "all servers";
+                settings.extraDescription = ''
+                  Will be merged by neovim using the behaviour of [`vim.tbl_deep_extend()`](https://neovim.io/doc/user/lua.html#vim.tbl_deep_extend()).
+                '';
+                settings.example = {
+                  root_markers = [ ".git" ];
+                  capabilities.textDocument.semanticTokens = {
+                    multilineTokenSupport = true;
+                  };
+                };
+              }
+            );
+            apply = value: value // { name = "*"; };
+            default = { };
+          };
+        }
+      ];
 
       description = ''
         LSP servers to enable and/or configure.
@@ -152,7 +182,7 @@ in
             ''
               vim.lsp.config(${luaName}, ${luaSettings})
             ''
-            + lib.optionalString server.activate ''
+            + lib.optionalString (server.activate or false) ''
               vim.lsp.enable(${luaName})
             '';
         in

modules/lsp/server-base.nix

@@ -0,0 +1,55 @@
+# Usage: lib.importApply ./server-base.nix { /*args*/ }
+{
+  displayName ? "the language server",
+  settings ? null,
+}:
+{ lib, ... }:
+let
+  inherit (lib) types;
+in
+{
+  options = {
+    enable = lib.mkEnableOption displayName;
+
+    settings = lib.mkOption {
+      type = with types; attrsOf anything;
+      description = ''
+        Configurations for ${displayName}. ${settings.extraDescription or ""}
+      '';
+      default = { };
+      example =
+        settings.example or {
+          cmd = [
+            "clangd"
+            "--background-index"
+          ];
+          root_markers = [
+            "compile_commands.json"
+            "compile_flags.txt"
+          ];
+          filetypes = [
+            "c"
+            "cpp"
+          ];
+        };
+    };
+
+    # 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" ])
+  ];
+}

modules/lsp/server.nix

@@ -1,6 +1,6 @@
 # Usage: lib.importApply ./server.nix { /*args*/ }
 {
-  name ? null,
+  name ? "the language server",
   package ? null,
   settings ? null,
   pkgs ? { },
@@ -18,8 +18,6 @@ let
 in
 {
   options = {
-    enable = lib.mkEnableOption displayName;
-
     name = lib.mkOption {
       type = types.maybeRaw types.str;
       description = ''
@@ -53,46 +51,11 @@ in
         Alternatively, ${displayName} should be installed on your `$PATH`.
       '';
     };
-
-    settings = lib.mkOption {
-      type = with types; attrsOf anything;
-      description = ''
-        Configurations for ${displayName}. ${settings.extraDescription or ""}
-      '';
-      default = { };
-      example =
-        settings.example or {
-          cmd = [
-            "clangd"
-            "--background-index"
-          ];
-          root_markers = [
-            "compile_commands.json"
-            "compile_flags.txt"
-          ];
-          filetypes = [
-            "c"
-            "cpp"
-          ];
-        };
-    };
-
-    # 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" ])
+    (lib.modules.importApply ./server-base.nix {
+      inherit displayName settings;
+    })
   ];
 }