Add highlighting to items in suggest box

This adds highlighting of the currently typed text into the shown items
of the suggest box.

extensions/ql-vscode/src/view/common/SuggestBox/HighlightedText.tsx

@@ -0,0 +1,26 @@
+import { styled } from "styled-components";
+import type { Snippet } from "./highlight";
+
+const Normal = styled.span``;
+const Highlighted = styled.span`
+  font-weight: 700;
+  color: var(--vscode-editorSuggestWidget-focusHighlightForeground);
+`;
+
+type Props = {
+  snippets: Snippet[];
+};
+
+export const HighlightedText = ({ snippets }: Props) => {
+  return (
+    <>
+      {snippets.map((snippet, index) =>
+        snippet.highlight ? (
+          <Highlighted key={index}>{snippet.text}</Highlighted>
+        ) : (
+          <Normal key={index}>{snippet.text}</Normal>
+        ),
+      )}
+    </>
+  );
+};

extensions/ql-vscode/src/view/common/SuggestBox/LabelText.tsx

@@ -0,0 +1,20 @@
+import { useMemo } from "react";
+import { createHighlights } from "./highlight";
+import { HighlightedText } from "./HighlightedText";
+import type { Option } from "./options";
+
+type Props<T extends Option<T>> = {
+  item: T;
+
+  tokens: string[];
+};
+
+export const LabelText = <T extends Option<T>>({ item, tokens }: Props<T>) => {
+  const highlights = useMemo(() => {
+    const highlightedToken = tokens[tokens.length - 1] ?? "";
+
+    return createHighlights(item.label, highlightedToken);
+  }, [item, tokens]);
+
+  return <HighlightedText snippets={highlights} />;
+};

extensions/ql-vscode/src/view/common/SuggestBox/SuggestBox.tsx

@@ -18,6 +18,7 @@ import { VSCodeTextField } from "@vscode/webview-ui-toolkit/react";
 import type { Option } from "./options";
 import { findMatchingOptions } from "./options";
 import { SuggestBoxItem } from "./SuggestBoxItem";
+import { LabelText } from "./LabelText";
 
 const Input = styled(VSCodeTextField)`
   width: 430px;
@@ -147,9 +148,13 @@ export const SuggestBox = <T extends Option<T>>({
     [onChange],
   );
 
+  const tokens = useMemo(() => {
+    return parseValueToTokens(value);
+  }, [value, parseValueToTokens]);
+
   const suggestionItems = useMemo(() => {
-    return findMatchingOptions(options, parseValueToTokens(value));
-  }, [options, value, parseValueToTokens]);
+    return findMatchingOptions(options, tokens);
+  }, [options, tokens]);
 
   useEffect(() => {
     if (disabled) {
@@ -222,7 +227,7 @@ export const SuggestBox = <T extends Option<T>>({
                     })}
                     active={activeIndex === index}
                     icon={getIcon?.(item)}
-                    labelText={item.label}
+                    labelText={<LabelText tokens={tokens} item={item} />}
                     details={getDetails?.(item)}
                   />
                 ))}

extensions/ql-vscode/src/view/common/SuggestBox/highlight.ts

@@ -1,4 +1,4 @@
-type Snippet = {
+export type Snippet = {
   text: string;
   highlight: boolean;
 };