Debounce autocomplete

src-web/components/Editor/autocomplete.ts

@@ -0,0 +1,29 @@
+import { closeCompletion, startCompletion } from '@codemirror/autocomplete';
+import { EditorView } from 'codemirror';
+import { debounce } from 'lodash';
+
+/*
+ * Debounce autocomplete until user stops typing for `millis` milliseconds.
+ */
+export function debouncedAutocompletionDisplay({ millis }: { millis: number }) {
+  // TODO: Figure out how to show completion without setting context.explicit = true
+  const debouncedStartCompletion = debounce(function (view: EditorView) {
+    startCompletion(view);
+  }, millis);
+
+  return EditorView.updateListener.of(({ view, docChanged }) => {
+    // const completions = currentCompletions(view.state);
+    // const status = completionStatus(view.state);
+
+    // If the document hasn't changed, we don't need to do anything
+    if (!docChanged) return;
+
+    if (view.state.doc.length === 0) {
+      debouncedStartCompletion.cancel();
+      closeCompletion(view);
+      return;
+    }
+
+    debouncedStartCompletion(view);
+  });
+}