Search feature enhancements (#1841)

* Added infinite scrolling to search feature.

* Added code to highlight the search keyword in search description

* feat: improve description layout

* feat: improve search context finding

* fix: remove all debug bits

---------

Co-authored-by: Nathan Sarrazin <sarrazin.nathan@gmail.com>

package-lock.json

@@ -41,6 +41,7 @@
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 				"mongodb": "^5.8.0",
 				"nanoid": "^5.0.9",
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 				"parquetjs": "^0.11.2",
 				"pino": "^9.0.0",
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@@ -6292,6 +6383,12 @@
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@@ -6463,6 +6560,24 @@
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@@ -7034,6 +7149,15 @@
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@@ -7308,6 +7432,15 @@
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@@ -9008,6 +9140,15 @@
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+			"license": "MIT",
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+			"license": "MIT",
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+			"license": "MIT",
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 		"node_modules/streamx": {
 			"version": "2.20.1",
 			"resolved": "https://registry.npmjs.org/streamx/-/streamx-2.20.1.tgz",
@@ -14663,6 +15321,14 @@
 				"@types/estree": "^1.0.6"
 			}
 		},
+		"node_modules/sylvester": {
+			"version": "0.0.12",
+			"resolved": "https://registry.npmjs.org/sylvester/-/sylvester-0.0.12.tgz",
+			"integrity": "sha512-SzRP5LQ6Ts2G5NyAa/jg16s8e3R7rfdFjizy1zeoecYWw+nGL+YA1xZvW/+iJmidBGSdLkuvdwTYEyJEb+EiUw==",
+			"engines": {
+				"node": ">=0.2.6"
+			}
+		},
 		"node_modules/symbol-tree": {
 			"version": "3.2.4",
 			"resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
@@ -15270,6 +15936,17 @@
 				"tiny-inflate": "^1.0.0"
 			}
 		},
+		"node_modules/union": {
+			"version": "0.5.0",
+			"resolved": "https://registry.npmjs.org/union/-/union-0.5.0.tgz",
+			"integrity": "sha512-N6uOhuW6zO95P3Mel2I2zMsbsanvvtgn6jVqJv4vbVcz/JN0OkL9suomjQGmWtxJQXOCqUJvquc1sMeNz/IwlA==",
+			"dependencies": {
+				"qs": "^6.4.0"
+			},
+			"engines": {
+				"node": ">= 0.8.0"
+			}
+		},
 		"node_modules/universal-github-app-jwt": {
 			"version": "2.2.2",
 			"resolved": "https://registry.npmjs.org/universal-github-app-jwt/-/universal-github-app-jwt-2.2.2.tgz",
@@ -15404,8 +16081,7 @@
 		"node_modules/url-join": {
 			"version": "4.0.1",
 			"resolved": "https://registry.npmjs.org/url-join/-/url-join-4.0.1.tgz",
-			"integrity": "sha512-jk1+QP6ZJqyOiuEI9AEWQfju/nB2Pw466kbA0LEZljHwKeMgd9WrAEgEGxjPDD2+TNbbb37rTyhEfrCXfuKXnA==",
-			"devOptional": true
+			"integrity": "sha512-jk1+QP6ZJqyOiuEI9AEWQfju/nB2Pw466kbA0LEZljHwKeMgd9WrAEgEGxjPDD2+TNbbb37rTyhEfrCXfuKXnA=="
 		},
 		"node_modules/url-parse": {
 			"version": "1.5.10",
@@ -15912,6 +16588,15 @@
 				"node": ">=0.10.0"
 			}
 		},
+		"node_modules/wordnet-db": {
+			"version": "3.1.14",
+			"resolved": "https://registry.npmjs.org/wordnet-db/-/wordnet-db-3.1.14.tgz",
+			"integrity": "sha512-zVyFsvE+mq9MCmwXUWHIcpfbrHHClZWZiVOzKSxNJruIcFn2RbY55zkhiAMMxM8zCVSmtNiViq8FsAZSFpMYag==",
+			"license": "MIT",
+			"engines": {
+				"node": ">=0.6.0"
+			}
+		},
 		"node_modules/wordwrap": {
 			"version": "1.0.0",
 			"resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
@@ -16051,6 +16736,15 @@
 			"resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
 			"integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw=="
 		},
+		"node_modules/xtend": {
+			"version": "4.0.2",
+			"resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+			"integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
+			"license": "MIT",
+			"engines": {
+				"node": ">=0.4"
+			}
+		},
 		"node_modules/y18n": {
 			"version": "5.0.8",
 			"resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",

package.json

@@ -102,6 +102,7 @@
 		"marked": "^12.0.1",
 		"mongodb": "^5.8.0",
 		"nanoid": "^5.0.9",
+		"natural": "^8.1.0",
 		"openid-client": "^5.4.2",
 		"parquetjs": "^0.11.2",
 		"pino": "^9.0.0",

src/lib/components/InfiniteScroll.svelte

@@ -44,7 +44,7 @@
 </script>
 
 <div bind:this={loader} class="flex animate-pulse flex-col gap-4">
-	<div class="ml-2 h-5 w-4/5 gap-5 rounded bg-gray-200 dark:bg-gray-700"></div>
-	<div class="ml-2 h-5 w-4/5 gap-5 rounded bg-gray-200 dark:bg-gray-700"></div>
-	<div class="ml-2 h-5 w-4/5 gap-5 rounded bg-gray-200 dark:bg-gray-700"></div>
+	<div class="w-5/5 ml-2 h-5 gap-5 rounded bg-gray-300 dark:bg-gray-700"></div>
+	<div class="w-5/5 ml-2 h-5 gap-5 rounded bg-gray-300 dark:bg-gray-700"></div>
+	<div class="w-5/5 ml-2 h-5 gap-5 rounded bg-gray-300 dark:bg-gray-700"></div>
 </div>

src/lib/components/NavConversationItem.svelte

@@ -12,9 +12,12 @@
 	interface Props {
 		conv: ConvSidebar;
 		readOnly?: true;
+		showDescription?: boolean;
+		description?: string;
+		searchInput?: string;
 	}
 
-	let { conv, readOnly }: Props = $props();
+	let { conv, readOnly, showDescription, description, searchInput }: Props = $props();
 
 	let confirmDelete = $state(false);
 
@@ -30,12 +33,12 @@
 		confirmDelete = false;
 	}}
 	href="{base}/conversation/{conv.id}"
-	class="group flex h-10 flex-none items-center gap-1.5 rounded-lg pl-2.5 pr-2 text-gray-600 hover:bg-gray-100 dark:text-gray-300 dark:hover:bg-gray-700 sm:h-[2.35rem] {conv.id ===
-	page.params.id
-		? 'bg-gray-100 dark:bg-gray-700'
-		: ''}"
+	class="group flex h-10 flex-none items-center gap-1.5 rounded-lg pl-2.5 pr-2 text-gray-600 hover:bg-gray-100 dark:text-gray-300 dark:hover:bg-gray-700
+		{conv.id === page.params.id ? 'bg-gray-100 dark:bg-gray-700' : ''} 
+		{showDescription ? 'sm:h-[3.5rem]' : 'sm:h-[2.35rem]'}
+	"
 >
-	<div class="flex flex-1 items-center truncate">
+	<div class="my-2 flex flex-1 flex-col items-start truncate">
 		{#if confirmDelete}
 			<span class="mr-1 font-semibold"> Delete </span>
 		{/if}
@@ -54,6 +57,14 @@
 		{:else}
 			{conv.title}
 		{/if}
+		{#if showDescription && description && searchInput}
+			<p class="ml-7 text-sm text-gray-500">
+				{#each description.split(searchInput) as segment, i}{segment}{#if i < description.split(searchInput).length - 1}<strong
+							>{searchInput}</strong
+						>{/if}
+				{/each}
+			</p>
+		{/if}
 	</div>
 
 	{#if !readOnly}

src/lib/components/NavMenu.svelte

@@ -27,6 +27,7 @@
 	import { toggleSearch } from "./chat/Search.svelte";
 	import CarbonSearch from "~icons/carbon/search";
 	import { closeMobileNav } from "./MobileNav.svelte";
+	import { isVirtualKeyboard } from "$lib/utils/isVirtualKeyboard";
 
 	interface Props {
 		conversations: ConvSidebar[];
@@ -118,15 +119,20 @@
 	class="scrollbar-custom flex touch-pan-y flex-col gap-1 overflow-y-auto rounded-r-xl from-gray-50 px-3 pb-3 pt-2 text-[.9rem] dark:from-gray-800/30 max-sm:bg-gradient-to-t md:bg-gradient-to-l"
 >
 	<button
-		class="mx-auto flex w-full flex-row items-center justify-stretch gap-x-2 rounded-xl px-2 py-1 pl-0 align-middle text-gray-600 hover:bg-gray-500/20 dark:text-gray-400"
+		class="group mx-auto flex w-full flex-row items-center justify-stretch gap-x-2 rounded-xl px-2 py-1 align-middle text-gray-600 hover:bg-gray-500/20 dark:text-gray-400"
 		onclick={() => {
 			closeMobileNav();
 			toggleSearch();
 		}}
 	>
 		<CarbonSearch class="text-xs" />
-		<span class="block">Search chats</span></button
-	>
+		<span class="block">Search chats</span>
+		{#if !isVirtualKeyboard()}
+			<span class="invisible ml-auto text-xs text-gray-500 group-hover:visible"
+				><kbd>ctrl</kbd>+<kbd>k</kbd></span
+			>
+		{/if}
+	</button>
 	{#await groupedConversations}
 		{#if $page.data.nConversations > 0}
 			<div class="overflow-y-hidden">

src/lib/components/chat/Search.svelte

@@ -20,16 +20,20 @@
 
 	import CarbonClose from "~icons/carbon/close";
 	import { fly } from "svelte/transition";
+	import InfiniteScroll from "../InfiniteScroll.svelte";
 
 	let inputElement: HTMLInputElement | undefined = $state(undefined);
 
 	let searchInput: string = $state("");
 	let debouncedInput: string = $state("");
+	let hasMore = $state(true);
 
 	let pending: boolean = $state(false);
 
 	let conversations: GETSearchEndpointReturn = $state([]);
 
+	let page: number = $state(0);
+
 	const dateRanges = [
 		new Date().setDate(new Date().getDate() - 1),
 		new Date().setDate(new Date().getDate() - 7),
@@ -48,25 +52,42 @@
 	});
 
 	const update = debounce(async (v: string) => {
+		if (debouncedInput !== v) {
+			conversations = [];
+			page = 0;
+			hasMore = true;
+		}
 		debouncedInput = v;
 		pending = true;
-		await fetch(`${base}/api/conversations/search?q=${v}`)
+		try {
+			await handleVisible(v);
+		} finally {
+			pending = false;
+		}
+	}, 300);
+
+	async function handleVisible(v: string) {
+		const newConvs = await fetch(`${base}/api/conversations/search?q=${v}&p=${page++}`)
 			.then(async (r) => {
 				if (r.ok) {
-					conversations = await r.json().then((conversations) =>
+					return await r.json().then((conversations) =>
 						conversations.map((conv: GETSearchEndpointReturn[number]) => ({
 							...conv,
 							updatedAt: new Date(conv.updatedAt),
 						}))
 					);
 				} else {
-					conversations = [];
+					return [];
 				}
 			})
-			.finally(() => {
-				pending = false;
-			});
-	}, 300);
+			.catch(() => []);
+
+		if (newConvs.length === 0) {
+			hasMore = false;
+		}
+
+		conversations = [...conversations, ...newConvs];
+	}
 
 	$effect(() => update(searchInput));
 
@@ -102,6 +123,7 @@
 	$effect(() => {
 		if (!searchOpen) {
 			searchInput = "";
+			debouncedInput = ""; // reset debouncedInput on search bar close
 		}
 	});
 </script>
@@ -135,7 +157,7 @@
 			}}
 		/>
 
-		<div class="max-h-[50dvh] overflow-y-scroll">
+		<div class="scrollbar-custom max-h-[40dvh] overflow-y-scroll">
 			{#if debouncedInput && debouncedInput.length >= 3}
 				{#if pending}
 					{#each Array(5) as _}
@@ -150,14 +172,23 @@
 				{:else}
 					{#each Object.entries(groupedConversations) as [group, convs]}
 						{#if convs.length}
-							<h4 class="mb-1.5 mt-4 pl-1.5 text-sm text-gray-400 dark:text-gray-500">
+							<h4 class="mb-1.5 mt-4 pl-1.5 text-sm text-gray-700 dark:text-gray-300">
 								{titles[group]}
 							</h4>
 							{#each convs as conv}
-								<NavConversationItem {conv} readOnly={true} />
+								<NavConversationItem
+									{conv}
+									readOnly={true}
+									showDescription={true}
+									description={conv.content}
+									searchInput={conv.matchedText}
+								/>
 							{/each}
 						{/if}
 					{/each}
+					{#if hasMore}
+						<InfiniteScroll on:visible={() => handleVisible(searchInput)} />
+					{/if}
 				{/if}
 			{/if}
 		</div>

src/routes/api/conversations/search/+server.ts

@@ -1,12 +1,15 @@
-import { CONV_NUM_PER_PAGE } from "$lib/constants/pagination";
 import { authCondition } from "$lib/server/auth";
 import { collections } from "$lib/server/database";
 import { models } from "$lib/server/models";
 import type { RequestHandler } from "@sveltejs/kit";
+import pkg from "natural";
+const { PorterStemmer } = pkg;
 
 export type GETSearchEndpointReturn = Array<{
 	id: string;
 	title: string;
+	content: string;
+	matchedText: string;
 	updatedAt: Date;
 	model: string;
 	assistantId?: string;
@@ -28,7 +31,9 @@ export const GET: RequestHandler = async ({ locals, url }) => {
 				...authCondition(locals),
 				$text: { $search: searchQuery },
 			})
-			.sort({ score: { $meta: "textScore" } })
+			.sort({
+				updatedAt: -1, // Sort by date updated in descending order
+			})
 			.project({
 				title: 1,
 				updatedAt: 1,
@@ -37,15 +42,191 @@ export const GET: RequestHandler = async ({ locals, url }) => {
 				messages: 1,
 				userId: 1,
 			})
-			.skip(p * CONV_NUM_PER_PAGE)
-			.limit(CONV_NUM_PER_PAGE)
+			.skip(p * 5)
+			.limit(5)
 			.toArray()
 			.then((convs) =>
 				convs.map((conv) => {
+					let matchedContent = "";
+					let matchedText = "";
+
+					// Find the best match using stemming to handle MongoDB's text search behavior
+					let bestMatch = null;
+					let bestMatchLength = 0;
+
+					// Simple function to find the best match in content
+					const findBestMatch = (
+						content: string,
+						query: string
+					): { start: number; end: number; text: string } | null => {
+						const contentLower = content.toLowerCase();
+						const queryLower = query.toLowerCase();
+
+						// Try exact word boundary match first
+						const wordRegex = new RegExp(
+							`\\b${queryLower.replace(/[.*+?^${}()|[\]\\]/g, "\\$&")}\\b`,
+							"gi"
+						);
+						const wordMatch = wordRegex.exec(content);
+						if (wordMatch) {
+							return {
+								start: wordMatch.index,
+								end: wordMatch.index + wordMatch[0].length - 1,
+								text: wordMatch[0],
+							};
+						}
+
+						// Try simple substring match
+						const index = contentLower.indexOf(queryLower);
+						if (index !== -1) {
+							return {
+								start: index,
+								end: index + queryLower.length - 1,
+								text: content.substring(index, index + queryLower.length),
+							};
+						}
+
+						return null;
+					};
+
+					// Create search variations
+					const searchVariations = [searchQuery.toLowerCase()];
+
+					// Add stemmed variations
+					try {
+						const stemmed = PorterStemmer.stem(searchQuery.toLowerCase());
+						if (stemmed !== searchQuery.toLowerCase()) {
+							searchVariations.push(stemmed);
+						}
+
+						// Find actual words in conversations that stem to the same root
+						for (const message of conv.messages) {
+							if (message.content) {
+								const words = message.content.toLowerCase().match(/\b\w+\b/g) || [];
+								words.forEach((word: string) => {
+									if (PorterStemmer.stem(word) === stemmed && !searchVariations.includes(word)) {
+										searchVariations.push(word);
+									}
+								});
+							}
+						}
+					} catch (e) {
+						console.warn("Stemming failed for:", searchQuery, e);
+					}
+
+					// Add simple variations
+					const query = searchQuery.toLowerCase();
+					if (query.endsWith("s") && query.length > 3) {
+						searchVariations.push(query.slice(0, -1));
+					} else if (!query.endsWith("s")) {
+						searchVariations.push(query + "s");
+					}
+
+					// Search through all messages for the best match
+					for (const message of conv.messages) {
+						if (!message.content) continue;
+
+						// Try each variation in order of preference
+						for (const variation of searchVariations) {
+							const match = findBestMatch(message.content, variation);
+							if (match) {
+								const isExactQuery = variation === searchQuery.toLowerCase();
+								const priority = isExactQuery ? 1000 : match.text.length;
+
+								if (priority > bestMatchLength) {
+									bestMatch = {
+										content: message.content,
+										matchStart: match.start,
+										matchEnd: match.end,
+										matchedText: match.text,
+									};
+									bestMatchLength = priority;
+
+									// If we found exact query match, we're done
+									if (isExactQuery) break;
+								}
+							}
+						}
+
+						// Stop if we found an exact match
+						if (bestMatchLength >= 1000) break;
+					}
+
+					if (bestMatch) {
+						const { content, matchStart, matchEnd } = bestMatch;
+						matchedText = bestMatch.matchedText;
+
+						// Create centered context around the match
+						const maxContextLength = 160; // Maximum length of actual content (no padding)
+						const matchLength = matchEnd - matchStart + 1;
+
+						// Calculate context window - don't exceed maxContextLength even if content is longer
+						const availableForContext = Math.min(maxContextLength, content.length) - matchLength;
+						const contextPerSide = Math.floor(availableForContext / 2);
+
+						// Calculate snippet boundaries to center the match within maxContextLength
+						let snippetStart = Math.max(0, matchStart - contextPerSide);
+						let snippetEnd = Math.min(content.length, matchStart + matchLength + contextPerSide);
+
+						// Ensure we don't exceed maxContextLength
+						if (snippetEnd - snippetStart > maxContextLength) {
+							if (matchStart - contextPerSide < 0) {
+								// Match is near start, extend end but limit to maxContextLength
+								snippetEnd = Math.min(content.length, snippetStart + maxContextLength);
+							} else {
+								// Match is not near start, limit to maxContextLength from match start
+								snippetEnd = Math.min(content.length, snippetStart + maxContextLength);
+							}
+						}
+
+						// Adjust to word boundaries if possible (but don't move more than 15 chars)
+						const originalStart = snippetStart;
+						const originalEnd = snippetEnd;
+
+						while (
+							snippetStart > 0 &&
+							content[snippetStart] !== " " &&
+							content[snippetStart] !== "\n" &&
+							originalStart - snippetStart < 15
+						) {
+							snippetStart--;
+						}
+						while (
+							snippetEnd < content.length &&
+							content[snippetEnd] !== " " &&
+							content[snippetEnd] !== "\n" &&
+							snippetEnd - originalEnd < 15
+						) {
+							snippetEnd++;
+						}
+
+						// Extract the content
+						let extractedContent = content.substring(snippetStart, snippetEnd).trim();
+						// Add ellipsis indicators only
+						if (snippetStart > 0) {
+							extractedContent = "..." + extractedContent;
+						}
+						if (snippetEnd < content.length) {
+							extractedContent = extractedContent + "...";
+						}
+
+						matchedContent = extractedContent;
+					} else {
+						// Fallback: use beginning of the first message if no match found
+						const firstMessage = conv.messages[0];
+						if (firstMessage?.content) {
+							const content = firstMessage.content;
+							matchedContent = content.length > 200 ? content.substring(0, 200) + "..." : content;
+							matchedText = searchQuery; // Fallback to search query
+						}
+					}
+
 					return {
 						_id: conv._id,
-						id: conv._id, // legacy param iOS
+						id: conv._id,
 						title: conv.title,
+						content: matchedContent,
+						matchedText,
 						updatedAt: conv.updatedAt,
 						model: conv.model,
 						assistantId: conv.assistantId,
@@ -53,7 +234,6 @@ export const GET: RequestHandler = async ({ locals, url }) => {
 					};
 				})
 			);
-
 		return Response.json(convs as GETSearchEndpointReturn);
 	}
 	return Response.json([]);