Move to exclusion list for config.

Take reviews into accounts

README.md

@@ -66,9 +66,9 @@ from the Language Server (in notebook).
 If the kernel is too slow to respond promptly only the Language Server suggestions will be shown (default threshold: 0.6s).
 You can configure the completer to not attempt to fetch the kernel completions if the kernel is busy (skipping the 0.6s timeout).
 
-You can deactivate the kernel suggestions by setting the `useKernelCompletions` to `false` in the `completion` section
-of advanced settings. Alternatively if you _only_ want kernel completions you can set `useLspCompletions` to `false`.
-Or both if you like to code in hardcore mode and get no completions.
+You can deactivate the kernel suggestions by adding `"kenel"` to the `disableCompletionsFrom` in the `completion` section
+of _Advanced Settings_. Alternatively if you _only_ want kernel completions you can add `"languageServer"` to the same
+setting; Or add both if you like to code in hardcore mode and get no completions, or if another provider has been added.
 
 ### Rename
 

packages/jupyterlab-lsp/schema/completion.json

@@ -41,17 +41,11 @@
       "type": "number",
       "description": "The time to wait for the kernel completions suggestions in milliseconds. Set to 0 to disable kernel completions, or to -1 to wait indefinitely (not recommended)."
     },
-    "useKernelCompletions": {
-      "title": "Request Kernel Completion",
-      "type": "boolean",
-      "default": true,
-      "description": "Whether to send completions request to the kernel."
-    },
-    "useLspCompletions": {
-      "title": "Request LSP Completion",
-      "type": "boolean",
-      "default": true,
-      "description": "Whether to send completions request to the lsp server."
+    "disableCompletionsFrom": {
+      "description": "The sources from which to exclude completion from. Possible values include 'kernel', 'languageServer'.",
+      "type": "array",
+      "default": [],
+      "uniqueItems": true
     },
     "waitForBusyKernel": {
       "title": "Wait for kernel if busy",

packages/jupyterlab-lsp/src/features/completion/completion_handler.ts

@@ -79,11 +79,19 @@ export class LSPConnector
   }
 
   protected get use_lsp_completions(): boolean {
-    return this.options.settings.composite.useLspCompletions;
+    return (
+      this.options.settings.composite.disableCompletionsFrom.indexOf(
+        'languageServer'
+      ) == -1
+    );
   }
 
   protected get use_kernel_completions(): boolean {
-    return this.options.settings.composite.useKernelCompletions;
+    return (
+      this.options.settings.composite.disableCompletionsFrom.indexOf(
+        'kernel'
+      ) == -1
+    );
   }
 
   protected get suppress_continuous_hinting_in(): string[] {
@@ -220,7 +228,6 @@ export class LSPConnector
     let virtual_cursor = virtual_editor.root_position_to_virtual_position(
       cursor_in_root
     );
-
     const lsp_promise: Promise<CompletionHandler.ICompletionItemsReply> = this
       .use_lsp_completions
       ? this.fetch_lsp(
@@ -240,6 +247,7 @@ export class LSPConnector
       const kernelTimeout = this._kernel_timeout;
 
       if (
+        this.use_kernel_completions &&
         this._kernel_connector &&
         this._has_kernel &&
         (this._is_kernel_idle || this._should_wait_for_busy_kernel) &&
@@ -285,10 +293,10 @@ export class LSPConnector
             lsp_promise.catch(p => p)
           ]).then(([kernel, lsp]) => {
             let replies = [];
-            if (this.use_kernel_completions) {
+            if (kernel != null) {
               replies.push(this.transform_reply(kernel));
             }
-            if (this.use_lsp_completions) {
+            if (lsp != null) {
               replies.push(lsp);
             }
             return this.merge_replies(replies, this._editor);