From 81ae5e6b5e198d8faf90d539c35b9fc872be7062 Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Tue, 28 Jul 2026 23:45:37 +0000
Subject: [PATCH] =?UTF-8?q?=E2=9A=A1=20Optimize=20string=20splitting=20for?=
 =?UTF-8?q?=20title=20extraction?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Replaced `.split("\n")` with an iterative `indexOf("\n")` approach in `titleFromContent`. This avoids scanning the entire string and allocating a large array of strings when extracting the title, which is especially impactful for large documents.

Co-authored-by: Horizontal42 <75383519+Horizontal42@users.noreply.github.com>
---
 package-lock.json | 4 ++--
 src/main.ts       | 8 ++++++--
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 438d3d1..08a992f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "summarum",
-  "version": "1.2.1",
+  "version": "1.2.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "summarum",
-      "version": "1.2.1",
+      "version": "1.2.2",
       "dependencies": {
         "@codemirror/autocomplete": "^6.18.0",
         "@codemirror/commands": "^6.8.0",
diff --git a/src/main.ts b/src/main.ts
index d0bedf1..499cc49 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -50,9 +50,13 @@ function activeDoc(): DocMeta {
 }
 
 function titleFromContent(text: string): string {
-  for (const line of text.split("\n")) {
-    const s = line.trim();
+  let start = 0;
+  while (start < text.length) {
+    let end = text.indexOf("\n", start);
+    if (end === -1) end = text.length;
+    const s = text.slice(start, end).trim();
     if (s.length > 0) return s.replace(/^#\s*/, "").slice(0, 30);
+    start = end + 1;
   }
   return t("untitled");
 }