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

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>
+  );
+}