Add generic searchable list to back settings and extensions (#18838)

packages/cli/src/ui/components/SettingsDialog.tsx

@@ -7,7 +7,6 @@
 import type React from 'react';
 import { useState, useEffect, useMemo, useCallback } from 'react';
 import { Text } from 'ink';
-import { AsyncFzf } from 'fzf';
 import type { Key } from '../hooks/useKeypress.js';
 import { theme } from '../semantic-colors.js';
 import type {
@@ -32,27 +31,17 @@ import {
   getEffectiveValue,
 } from '../../utils/settingsUtils.js';
 import { useVimMode } from '../contexts/VimModeContext.js';
-import { getCachedStringWidth } from '../utils/textUtils.js';
 import {
   type SettingsValue,
   TOGGLE_TYPES,
 } from '../../config/settingsSchema.js';
 import { coreEvents, debugLogger } from '@google/gemini-cli-core';
 import type { Config } from '@google/gemini-cli-core';
-import { useUIState } from '../contexts/UIStateContext.js';
-import { useTextBuffer } from './shared/text-buffer.js';
 import {
-  BaseSettingsDialog,
   type SettingsDialogItem,
+  BaseSettingsDialog,
 } from './shared/BaseSettingsDialog.js';
-
+import { useFuzzyList } from '../hooks/useFuzzyList.js';
-interface FzfResult {
-  item: string;
-  start: number;
-  end: number;
-  score: number;
-  positions?: number[];
-}
 
 interface SettingsDialogProps {
   settings: LoadedSettings;
@@ -81,60 +70,6 @@ export function SettingsDialog({
 
   const [showRestartPrompt, setShowRestartPrompt] = useState(false);
 
-  // Search state
-  const [searchQuery, setSearchQuery] = useState('');
-  const [filteredKeys, setFilteredKeys] = useState<string[]>(() =>
-    getDialogSettingKeys(),
-  );
-  const { fzfInstance, searchMap } = useMemo(() => {
-    const keys = getDialogSettingKeys();
-    const map = new Map<string, string>();
-    const searchItems: string[] = [];
-
-    keys.forEach((key) => {
-      const def = getSettingDefinition(key);
-      if (def?.label) {
-        searchItems.push(def.label);
-        map.set(def.label.toLowerCase(), key);
-      }
-    });
-
-    const fzf = new AsyncFzf(searchItems, {
-      fuzzy: 'v2',
-      casing: 'case-insensitive',
-    });
-    return { fzfInstance: fzf, searchMap: map };
-  }, []);
-
-  // Perform search
-  useEffect(() => {
-    let active = true;
-    if (!searchQuery.trim() || !fzfInstance) {
-      setFilteredKeys(getDialogSettingKeys());
-      return;
-    }
-
-    const doSearch = async () => {
-      const results = await fzfInstance.find(searchQuery);
-
-      if (!active) return;
-
-      const matchedKeys = new Set<string>();
-      results.forEach((res: FzfResult) => {
-        const key = searchMap.get(res.item.toLowerCase());
-        if (key) matchedKeys.add(key);
-      });
-      setFilteredKeys(Array.from(matchedKeys));
-    };
-
-    // eslint-disable-next-line @typescript-eslint/no-floating-promises
-    doSearch();
-
-    return () => {
-      active = false;
-    };
-  }, [searchQuery, fzfInstance, searchMap]);
-
   // Local pending settings state for the selected scope
   const [pendingSettings, setPendingSettings] = useState<Settings>(() =>
     // Deep clone to avoid mutation
@@ -182,49 +117,8 @@ export function SettingsDialog({
     setShowRestartPrompt(newRestartRequired.size > 0);
   }, [selectedScope, settings, globalPendingChanges]);
 
-  // Calculate max width for the left column (Label/Description) to keep values aligned or close
+  // Generate items for SearchableList
-  const maxLabelOrDescriptionWidth = useMemo(() => {
+  const settingKeys = useMemo(() => getDialogSettingKeys(), []);
-    const allKeys = getDialogSettingKeys();
-    let max = 0;
-    for (const key of allKeys) {
-      const def = getSettingDefinition(key);
-      if (!def) continue;
-
-      const scopeMessage = getScopeMessageForSetting(
-        key,
-        selectedScope,
-        settings,
-      );
-      const label = def.label || key;
-      const labelFull = label + (scopeMessage ? ` ${scopeMessage}` : '');
-      const lWidth = getCachedStringWidth(labelFull);
-      const dWidth = def.description
-        ? getCachedStringWidth(def.description)
-        : 0;
-
-      max = Math.max(max, lWidth, dWidth);
-    }
-    return max;
-  }, [selectedScope, settings]);
-
-  // Get mainAreaWidth for search buffer viewport
-  const { mainAreaWidth } = useUIState();
-  const viewportWidth = mainAreaWidth - 8;
-
-  // Search input buffer
-  const searchBuffer = useTextBuffer({
-    initialText: '',
-    initialCursorOffset: 0,
-    viewport: {
-      width: viewportWidth,
-      height: 1,
-    },
-    singleLine: true,
-    onChange: (text) => setSearchQuery(text),
-  });
-
-  // Generate items for BaseSettingsDialog
-  const settingKeys = searchQuery ? filteredKeys : getDialogSettingKeys();
   const items: SettingsDialogItem[] = useMemo(() => {
     const scopeSettings = settings.forScope(selectedScope).settings;
     const mergedSettings = settings.merged;
@@ -270,6 +164,10 @@ export function SettingsDialog({
     });
   }, [settingKeys, selectedScope, settings, modifiedSettings, pendingSettings]);
 
+  const { filteredItems, searchBuffer, maxLabelWidth } = useFuzzyList({
+    items,
+  });
+
   // Scope selection handler
   const handleScopeChange = useCallback((scope: LoadableSettingScope) => {
     setSelectedScope(scope);
@@ -696,12 +594,12 @@ export function SettingsDialog({
       borderColor={showRestartPrompt ? theme.status.warning : undefined}
       searchEnabled={showSearch}
       searchBuffer={searchBuffer}
-      items={items}
+      items={filteredItems}
       showScopeSelector={showScopeSelection}
       selectedScope={selectedScope}
       onScopeChange={handleScopeChange}
       maxItemsToShow={effectiveMaxItemsToShow}
-      maxLabelWidth={maxLabelOrDescriptionWidth}
+      maxLabelWidth={maxLabelWidth}
       onItemToggle={handleItemToggle}
       onEditCommit={handleEditCommit}
       onItemClear={handleItemClear}

packages/cli/src/ui/components/shared/BaseSettingsDialog.tsx

@@ -144,28 +144,30 @@ export function BaseSettingsDialog({
   useEffect(() => {
     const prevItems = prevItemsRef.current;
     if (prevItems !== items) {
-      const prevActiveItem = prevItems[activeIndex];
+      if (items.length === 0) {
-      if (prevActiveItem) {
-        const newIndex = items.findIndex((i) => i.key === prevActiveItem.key);
-        if (newIndex !== -1) {
-          // Item still exists in the filtered list, keep focus on it
-          setActiveIndex(newIndex);
-          // Adjust scroll offset to ensure the item is visible
-          let newScroll = scrollOffset;
-          if (newIndex < scrollOffset) newScroll = newIndex;
-          else if (newIndex >= scrollOffset + maxItemsToShow)
-            newScroll = newIndex - maxItemsToShow + 1;
-
-          const maxScroll = Math.max(0, items.length - maxItemsToShow);
-          setScrollOffset(Math.min(newScroll, maxScroll));
-        } else {
-          // Item was filtered out, reset to the top
-          setActiveIndex(0);
-          setScrollOffset(0);
-        }
-      } else {
         setActiveIndex(0);
         setScrollOffset(0);
+      } else {
+        const prevActiveItem = prevItems[activeIndex];
+        if (prevActiveItem) {
+          const newIndex = items.findIndex((i) => i.key === prevActiveItem.key);
+          if (newIndex !== -1) {
+            // Item still exists in the filtered list, keep focus on it
+            setActiveIndex(newIndex);
+            // Adjust scroll offset to ensure the item is visible
+            let newScroll = scrollOffset;
+            if (newIndex < scrollOffset) newScroll = newIndex;
+            else if (newIndex >= scrollOffset + maxItemsToShow)
+              newScroll = newIndex - maxItemsToShow + 1;
+
+            const maxScroll = Math.max(0, items.length - maxItemsToShow);
+            setScrollOffset(Math.min(newScroll, maxScroll));
+          } else {
+            // Item was filtered out, reset to the top
+            setActiveIndex(0);
+            setScrollOffset(0);
+          }
+        }
       }
       prevItemsRef.current = items;
     }
@@ -416,7 +418,10 @@ export function BaseSettingsDialog({
 
       return;
     },
-    { isActive: true },
+    {
+      isActive: true,
+      priority: focusSection === 'settings' && !editingKey,
+    },
   );
 
   return (

packages/cli/src/ui/components/shared/SearchableList.test.tsx

@@ -0,0 +1,156 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import React from 'react';
+import { render } from '../../../test-utils/render.js';
+import { waitFor } from '../../../test-utils/async.js';
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { SearchableList, type SearchableListProps } from './SearchableList.js';
+import { KeypressProvider } from '../../contexts/KeypressContext.js';
+import { type GenericListItem } from '../../hooks/useFuzzyList.js';
+
+// Mock UI State
+vi.mock('../../contexts/UIStateContext.js', () => ({
+  useUIState: () => ({
+    mainAreaWidth: 100,
+  }),
+}));
+
+const mockItems: GenericListItem[] = [
+  {
+    key: 'item-1',
+    label: 'Item One',
+    description: 'Description for item one',
+  },
+  {
+    key: 'item-2',
+    label: 'Item Two',
+    description: 'Description for item two',
+  },
+  {
+    key: 'item-3',
+    label: 'Item Three',
+    description: 'Description for item three',
+  },
+];
+
+describe('SearchableList', () => {
+  let mockOnSelect: ReturnType<typeof vi.fn>;
+  let mockOnClose: ReturnType<typeof vi.fn>;
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+    mockOnSelect = vi.fn();
+    mockOnClose = vi.fn();
+  });
+
+  const renderList = (
+    props: Partial<SearchableListProps<GenericListItem>> = {},
+  ) => {
+    const defaultProps: SearchableListProps<GenericListItem> = {
+      title: 'Test List',
+      items: mockItems,
+      onSelect: mockOnSelect,
+      onClose: mockOnClose,
+      ...props,
+    };
+
+    return render(
+      <KeypressProvider>
+        <SearchableList {...defaultProps} />
+      </KeypressProvider>,
+    );
+  };
+
+  it('should render all items initially', () => {
+    const { lastFrame } = renderList();
+    const frame = lastFrame();
+
+    // Check for title
+    expect(frame).toContain('Test List');
+
+    // Check for items
+    expect(frame).toContain('Item One');
+    expect(frame).toContain('Item Two');
+    expect(frame).toContain('Item Three');
+
+    // Check for descriptions
+    expect(frame).toContain('Description for item one');
+  });
+
+  it('should filter items based on search query', async () => {
+    const { lastFrame, stdin } = renderList();
+
+    // Type "Two" into search
+    await React.act(async () => {
+      stdin.write('Two');
+    });
+
+    await waitFor(() => {
+      const frame = lastFrame();
+      expect(frame).toContain('Item Two');
+      expect(frame).not.toContain('Item One');
+      expect(frame).not.toContain('Item Three');
+    });
+  });
+
+  it('should show "No items found." when no items match', async () => {
+    const { lastFrame, stdin } = renderList();
+
+    // Type something that won't match
+    await React.act(async () => {
+      stdin.write('xyz123');
+    });
+
+    await waitFor(() => {
+      const frame = lastFrame();
+      expect(frame).toContain('No items found.');
+    });
+  });
+
+  it('should handle selection with Enter', async () => {
+    const { stdin } = renderList();
+
+    // Select first item (default active)
+    await React.act(async () => {
+      stdin.write('\r'); // Enter
+    });
+
+    await waitFor(() => {
+      expect(mockOnSelect).toHaveBeenCalledWith(mockItems[0]);
+    });
+  });
+
+  it('should handle navigation and selection', async () => {
+    const { stdin } = renderList();
+
+    // Navigate down to second item
+    await React.act(async () => {
+      stdin.write('\u001B[B'); // Down Arrow
+    });
+
+    // Select second item
+    await React.act(async () => {
+      stdin.write('\r'); // Enter
+    });
+
+    await waitFor(() => {
+      expect(mockOnSelect).toHaveBeenCalledWith(mockItems[1]);
+    });
+  });
+
+  it('should handle close with Esc', async () => {
+    const { stdin } = renderList();
+
+    await React.act(async () => {
+      stdin.write('\u001B'); // Esc
+    });
+
+    await waitFor(() => {
+      expect(mockOnClose).toHaveBeenCalled();
+    });
+  });
+});

packages/cli/src/ui/components/shared/SearchableList.tsx

@@ -0,0 +1,189 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import type React from 'react';
+import { useState, useEffect } from 'react';
+import { Box, Text } from 'ink';
+import { theme } from '../../semantic-colors.js';
+import { TextInput } from './TextInput.js';
+import { useKeypress, type Key } from '../../hooks/useKeypress.js';
+import { keyMatchers, Command } from '../../keyMatchers.js';
+import {
+  useFuzzyList,
+  type GenericListItem,
+} from '../../hooks/useFuzzyList.js';
+
+export interface SearchableListProps<T extends GenericListItem> {
+  /** List title */
+  title?: string;
+  /** Available items */
+  items: T[];
+  /** Callback when an item is selected */
+  onSelect: (item: T) => void;
+  /** Callback when the list is closed (e.g. via Esc) */
+  onClose?: () => void;
+  /** Initial search query */
+  initialSearchQuery?: string;
+  /** Placeholder for search input */
+  searchPlaceholder?: string;
+  /** Max items to show at once */
+  maxItemsToShow?: number;
+}
+
+/**
+ * A generic searchable list component.
+ */
+export function SearchableList<T extends GenericListItem>({
+  title,
+  items,
+  onSelect,
+  onClose,
+  initialSearchQuery = '',
+  searchPlaceholder = 'Search...',
+  maxItemsToShow = 10,
+}: SearchableListProps<T>): React.JSX.Element {
+  const { filteredItems, searchBuffer, maxLabelWidth } = useFuzzyList({
+    items,
+    initialQuery: initialSearchQuery,
+  });
+
+  const [activeIndex, setActiveIndex] = useState(0);
+  const [scrollOffset, setScrollOffset] = useState(0);
+
+  // Reset selection when filtered items change
+  useEffect(() => {
+    setActiveIndex(0);
+    setScrollOffset(0);
+  }, [filteredItems]);
+
+  // Calculate visible items
+  const visibleItems = filteredItems.slice(
+    scrollOffset,
+    scrollOffset + maxItemsToShow,
+  );
+  const showScrollUp = scrollOffset > 0;
+  const showScrollDown = scrollOffset + maxItemsToShow < filteredItems.length;
+
+  useKeypress(
+    (key: Key) => {
+      // Navigation
+      if (keyMatchers[Command.DIALOG_NAVIGATION_UP](key)) {
+        const newIndex =
+          activeIndex > 0 ? activeIndex - 1 : filteredItems.length - 1;
+        setActiveIndex(newIndex);
+        if (newIndex === filteredItems.length - 1) {
+          setScrollOffset(Math.max(0, filteredItems.length - maxItemsToShow));
+        } else if (newIndex < scrollOffset) {
+          setScrollOffset(newIndex);
+        }
+        return;
+      }
+      if (keyMatchers[Command.DIALOG_NAVIGATION_DOWN](key)) {
+        const newIndex =
+          activeIndex < filteredItems.length - 1 ? activeIndex + 1 : 0;
+        setActiveIndex(newIndex);
+        if (newIndex === 0) {
+          setScrollOffset(0);
+        } else if (newIndex >= scrollOffset + maxItemsToShow) {
+          setScrollOffset(newIndex - maxItemsToShow + 1);
+        }
+        return;
+      }
+
+      // Selection
+      if (keyMatchers[Command.RETURN](key)) {
+        const item = filteredItems[activeIndex];
+        if (item) {
+          onSelect(item);
+        }
+        return;
+      }
+
+      // Close
+      if (keyMatchers[Command.ESCAPE](key)) {
+        onClose?.();
+        return;
+      }
+    },
+    { isActive: true },
+  );
+
+  return (
+    <Box
+      borderStyle="round"
+      borderColor={theme.border.default}
+      flexDirection="column"
+      padding={1}
+      width="100%"
+    >
+      {/* Header */}
+      {title && (
+        <Box marginBottom={1}>
+          <Text bold>{title}</Text>
+        </Box>
+      )}
+
+      {/* Search Input */}
+      {searchBuffer && (
+        <Box
+          borderStyle="round"
+          borderColor={theme.border.focused}
+          paddingX={1}
+          marginBottom={1}
+        >
+          <TextInput
+            buffer={searchBuffer}
+            placeholder={searchPlaceholder}
+            focus={true}
+          />
+        </Box>
+      )}
+
+      {/* List */}
+      <Box flexDirection="column">
+        {visibleItems.length === 0 ? (
+          <Text color={theme.text.secondary}>No items found.</Text>
+        ) : (
+          visibleItems.map((item, idx) => {
+            const index = scrollOffset + idx;
+            const isActive = index === activeIndex;
+
+            return (
+              <Box key={item.key} flexDirection="row">
+                <Text
+                  color={isActive ? theme.status.success : theme.text.secondary}
+                >
+                  {isActive ? '> ' : '  '}
+                </Text>
+                <Box width={maxLabelWidth + 2}>
+                  <Text
+                    color={isActive ? theme.status.success : theme.text.primary}
+                  >
+                    {item.label}
+                  </Text>
+                </Box>
+                {item.description && (
+                  <Text color={theme.text.secondary}>{item.description}</Text>
+                )}
+              </Box>
+            );
+          })
+        )}
+      </Box>
+
+      {/* Footer/Scroll Indicators */}
+      {(showScrollUp || showScrollDown) && (
+        <Box marginTop={1} justifyContent="center">
+          <Text color={theme.text.secondary}>
+            {showScrollUp ? '▲ ' : '  '}
+            {filteredItems.length} items
+            {showScrollDown ? ' ▼' : '  '}
+          </Text>
+        </Box>
+      )}
+    </Box>
+  );
+}

packages/cli/src/ui/hooks/useFuzzyList.ts

@@ -0,0 +1,151 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { useState, useMemo, useEffect } from 'react';
+import { AsyncFzf } from 'fzf';
+import { useUIState } from '../contexts/UIStateContext.js';
+import {
+  useTextBuffer,
+  type TextBuffer,
+} from '../components/shared/text-buffer.js';
+import { getCachedStringWidth } from '../utils/textUtils.js';
+
+interface FzfResult {
+  item: string;
+  start: number;
+  end: number;
+  score: number;
+  positions?: number[];
+}
+
+export interface GenericListItem {
+  key: string;
+  label: string;
+  description?: string;
+  scopeMessage?: string;
+}
+
+export interface UseFuzzyListProps<T extends GenericListItem> {
+  items: T[];
+  initialQuery?: string;
+  onSearch?: (query: string) => void;
+}
+
+export interface UseFuzzyListResult<T extends GenericListItem> {
+  filteredItems: T[];
+  searchBuffer: TextBuffer | undefined;
+  searchQuery: string;
+  setSearchQuery: (query: string) => void;
+  maxLabelWidth: number;
+}
+
+export function useFuzzyList<T extends GenericListItem>({
+  items,
+  initialQuery = '',
+  onSearch,
+}: UseFuzzyListProps<T>): UseFuzzyListResult<T> {
+  // Search state
+  const [searchQuery, setSearchQuery] = useState(initialQuery);
+  const [filteredKeys, setFilteredKeys] = useState<string[]>(() =>
+    items.map((i) => i.key),
+  );
+
+  // FZF instance for fuzzy searching
+  const { fzfInstance, searchMap } = useMemo(() => {
+    const map = new Map<string, string>();
+    const searchItems: string[] = [];
+
+    items.forEach((item) => {
+      searchItems.push(item.label);
+      map.set(item.label.toLowerCase(), item.key);
+    });
+
+    const fzf = new AsyncFzf(searchItems, {
+      fuzzy: 'v2',
+      casing: 'case-insensitive',
+    });
+    return { fzfInstance: fzf, searchMap: map };
+  }, [items]);
+
+  // Perform search
+  useEffect(() => {
+    let active = true;
+    if (!searchQuery.trim() || !fzfInstance) {
+      setFilteredKeys(items.map((i) => i.key));
+      return;
+    }
+
+    const doSearch = async () => {
+      const results = await fzfInstance.find(searchQuery);
+
+      if (!active) return;
+
+      const matchedKeys = new Set<string>();
+      results.forEach((res: FzfResult) => {
+        const key = searchMap.get(res.item.toLowerCase());
+        if (key) matchedKeys.add(key);
+      });
+      setFilteredKeys(Array.from(matchedKeys));
+      onSearch?.(searchQuery);
+    };
+
+    void doSearch().catch((error) => {
+      // eslint-disable-next-line no-console
+      console.error('Search failed:', error);
+      setFilteredKeys(items.map((i) => i.key)); // Reset to all items on error
+    });
+
+    return () => {
+      active = false;
+    };
+  }, [searchQuery, fzfInstance, searchMap, items, onSearch]);
+
+  // Get mainAreaWidth for search buffer viewport from UIState
+  const { mainAreaWidth } = useUIState();
+  const viewportWidth = Math.max(20, mainAreaWidth - 8);
+
+  // Search input buffer
+  const searchBuffer = useTextBuffer({
+    initialText: searchQuery,
+    initialCursorOffset: searchQuery.length,
+    viewport: {
+      width: viewportWidth,
+      height: 1,
+    },
+    singleLine: true,
+    onChange: (text) => setSearchQuery(text),
+  });
+
+  // Filtered items to display
+  const filteredItems = useMemo(() => {
+    if (!searchQuery) return items;
+    return items.filter((item) => filteredKeys.includes(item.key));
+  }, [items, filteredKeys, searchQuery]);
+
+  // Calculate max label width for alignment
+  const maxLabelWidth = useMemo(() => {
+    let max = 0;
+    // We use all items for consistent alignment even when filtered
+    items.forEach((item) => {
+      const labelFull =
+        item.label + (item.scopeMessage ? ` ${item.scopeMessage}` : '');
+      const lWidth = getCachedStringWidth(labelFull);
+      const dWidth = item.description
+        ? getCachedStringWidth(item.description)
+        : 0;
+      max = Math.max(max, lWidth, dWidth);
+    });
+    return max;
+  }, [items]);
+
+  return {
+    filteredItems,
+    searchBuffer,
+    searchQuery,
+    setSearchQuery,
+    maxLabelWidth,
+  };
+}