fix(deps): replace flexsearch-ts with orama

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

frontend/src/hooks/common/use-cheatsheet-search.ts

@@ -0,0 +1,80 @@
+/*
+ * SPDX-FileCopyrightText: 2024 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { useEffect, useState } from 'react'
+import { create, insert, search } from '@orama/orama'
+import { useAsync } from 'react-use'
+import { Logger } from '../../utils/logger'
+
+export interface CheatsheetSearchIndexEntry {
+  readonly id: string
+  readonly title: string
+  readonly description: string
+  readonly example: string
+  readonly extensionId: string
+}
+
+const logger = new Logger('Cheatsheet Search')
+
+/**
+ * Generate document search index and provide functions to search.
+ *
+ * @param entries The list of entries to build the search index from
+ * @param searchTerm What to search for
+ * @return An array of the search results
+ */
+export const useCheatsheetSearch = (
+  entries: CheatsheetSearchIndexEntry[],
+  searchTerm: string
+): CheatsheetSearchIndexEntry[] => {
+  const [results, setResults] = useState<CheatsheetSearchIndexEntry[]>([])
+
+  const {
+    value: searchIndex,
+    loading: searchIndexLoading,
+    error: searchIndexError
+  } = useAsync(async () => {
+    const db = await create({
+      schema: {
+        id: 'string',
+        title: 'string',
+        description: 'string',
+        example: 'string',
+        extensionId: 'string'
+      } as const
+    })
+    const adds = entries.map((entry) => {
+      logger.debug('Add to search entry:', entry)
+      return insert(db, entry)
+    })
+    await Promise.all(adds)
+    return db
+  }, [entries])
+
+  useEffect(() => {
+    if (searchIndexLoading || searchIndexError !== undefined || searchIndex === undefined || searchTerm === '') {
+      return setResults(entries)
+    }
+    search(searchIndex, {
+      term: searchTerm,
+      tolerance: 1,
+      properties: ['title', 'description', 'example'],
+      boost: {
+        title: 3,
+        description: 2,
+        example: 1
+      }
+    })
+      .then((results) => {
+        setResults(results.hits.map((entry) => entry.document))
+      })
+      .catch((error) => {
+        logger.error(error)
+      })
+  }, [entries, searchIndexError, searchIndexLoading, searchIndex, searchTerm])
+
+  return results
+}