plugins/neotest: move to by-name

plugins/by-name/neotest/adapters.nix

@@ -0,0 +1,62 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}:
+with lib;
+let
+  inherit (lib.nixvim) mkSettingsOption toLuaObject;
+  supportedAdapters = import ./adapters-list.nix;
+
+  mkAdapter =
+    name:
+    {
+      treesitter-parser,
+      packageName ? "neotest-${name}",
+      settingsSuffix ? settingsLua: "(${settingsLua})",
+    }:
+    {
+      options.plugins.neotest.adapters.${name} = {
+        enable = mkEnableOption name;
+
+        package = lib.mkPackageOption pkgs name {
+          default = [
+            "vimPlugins"
+            packageName
+          ];
+        };
+
+        settings = mkSettingsOption { description = "settings for the `${name}` adapter."; };
+      };
+
+      config =
+        let
+          cfg = config.plugins.neotest.adapters.${name};
+        in
+        mkIf cfg.enable {
+          extraPlugins = [ cfg.package ];
+
+          assertions = [
+            {
+              assertion = config.plugins.neotest.enable;
+              message = "Nixvim: you have enabled `plugins.neotest.adapters.${name}` but `plugins.neotest.enable` is `false`.";
+            }
+          ];
+
+          warnings = optional (!config.plugins.treesitter.enable) ''
+            Nixvim (plugins.neotest.adapters.${name}): This adapter requires `treesitter` to be enabled.
+            You might want to set `plugins.treesitter.enable = true` and ensure that the `${props.treesitter-parser}` parser is enabled.
+          '';
+
+          plugins.neotest.settings.adapters =
+            let
+              settingsString = optionalString (cfg.settings != { }) (settingsSuffix (toLuaObject cfg.settings));
+            in
+            [ "require('neotest-${name}')${settingsString}" ];
+        };
+    };
+in
+{
+  imports = mapAttrsToList mkAdapter supportedAdapters;
+}