plugins/cmp-tabnine: move to by-name

tests/test-sources/plugins/by-name/cmp-tabnine/default.nix

@@ -0,0 +1,49 @@
+{ lib, pkgs, ... }:
+let
+  platform = pkgs.stdenv.hostPlatform;
+
+  # tabnine is not available on aarch64-linux.
+  doRun = !(platform.isLinux && platform.isAarch64);
+in
+lib.optionalAttrs doRun {
+  empty = {
+    plugins = {
+      cmp.enable = true;
+      cmp-tabnine.enable = true;
+    };
+  };
+
+  defaults = {
+    plugins = {
+      cmp.enable = true;
+      cmp-tabnine = {
+        enable = true;
+
+        settings = {
+          max_lines = 1000;
+          max_num_results = 20;
+          sort = true;
+          run_on_every_keystroke = true;
+          snippet_placeholder = "..";
+          ignored_file_types = { };
+          min_percent = 0;
+        };
+      };
+    };
+  };
+
+  example = {
+    plugins = {
+      cmp.enable = true;
+      cmp-tabnine = {
+        enable = true;
+
+        settings = {
+          max_lines = 600;
+          max_num_results = 10;
+          sort = false;
+        };
+      };
+    };
+  };
+}