From 345bec8a05c6643bd73618654e09bf048887dcd7 Mon Sep 17 00:00:00 2001
From: mARTin-B78 <mail@martin-bierschenk.de>
Date: Wed, 10 Jun 2026 03:41:31 +0200
Subject: [PATCH] Fix chunked TTS failing on newline-delimited text (e.g.
 German bullet lists)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

splitTextIntoChunks only split on sentence terminators (.!?), so structured
text separated by newlines was never chunked — the full page went as one
request, causing a TCP timeout that the browser reported as "Failed to fetch".

Fix: process each line individually before applying the sentence regex so
newline-separated segments become their own split points. Also move
generation.js from deferred batch E into the main feature batch C so
generateChunkedTts is always defined before the user can click Generate.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 static/app.js           | 23 ++++++++++++++++-------
 static/js/generation.js | 23 ++++++++++++++++-------
 static/loader.js        |  5 ++---
 3 files changed, 34 insertions(+), 17 deletions(-)

diff --git a/static/app.js b/static/app.js
index b9bc01e..158b760 100644
--- a/static/app.js
+++ b/static/app.js
@@ -8027,16 +8027,25 @@ async function mergeWavBlobs(blobs) {
 function splitTextIntoChunks(text, maxLen = 800) {
   const abbrev = /\b(Mr|Mrs|Ms|Dr|Prof|Sr|Jr|vs|etc|e\.g|i\.e)\.\s/g;
   const safe = text.replace(abbrev, m => m.replace('.', '\x00'));
-  const parts = safe.match(/[^.!?]+[.!?]+\s*/g) || [];
-  const last = safe.replace(/[^.!?]+[.!?]+\s*/g, '').trim();
-  if (last) parts.push(last);
   const restore = s => s.replace(/\x00/g, '.');
-  if (!parts.length) return [text];
+
+  // Gather segments from each line: sentences first, then any remaining line text.
+  // This ensures newline-delimited text (e.g. German bullet lists) gets split too.
+  const segments = [];
+  for (const line of safe.split('\n')) {
+    const sentences = line.match(/[^.!?]+[.!?]+\s*/g) || [];
+    const rest = line.replace(/[^.!?]+[.!?]+\s*/g, '').trim();
+    segments.push(...sentences);
+    if (rest) segments.push(rest);
+  }
+  if (!segments.length) return [text];
+
   const chunks = [];
   let cur = '';
-  for (const p of parts) {
-    if ((cur + p).length > maxLen && cur) { chunks.push(restore(cur.trim())); cur = p; }
-    else cur += p;
+  for (const seg of segments) {
+    const joined = cur ? cur + ' ' + seg.trim() : seg.trim();
+    if (joined.length > maxLen && cur) { chunks.push(restore(cur.trim())); cur = seg.trim(); }
+    else cur = joined;
   }
   if (cur.trim()) chunks.push(restore(cur.trim()));
   return chunks.length ? chunks : [text];
diff --git a/static/js/generation.js b/static/js/generation.js
index fb5ba7b..2430af7 100644
--- a/static/js/generation.js
+++ b/static/js/generation.js
@@ -57,16 +57,25 @@ async function mergeWavBlobs(blobs) {
 function splitTextIntoChunks(text, maxLen = 800) {
   const abbrev = /\b(Mr|Mrs|Ms|Dr|Prof|Sr|Jr|vs|etc|e\.g|i\.e)\.\s/g;
   const safe = text.replace(abbrev, m => m.replace('.', '\x00'));
-  const parts = safe.match(/[^.!?]+[.!?]+\s*/g) || [];
-  const last = safe.replace(/[^.!?]+[.!?]+\s*/g, '').trim();
-  if (last) parts.push(last);
   const restore = s => s.replace(/\x00/g, '.');
-  if (!parts.length) return [text];
+
+  // Gather segments from each line: sentences first, then any remaining line text.
+  // This ensures newline-delimited text (e.g. German bullet lists) gets split too.
+  const segments = [];
+  for (const line of safe.split('\n')) {
+    const sentences = line.match(/[^.!?]+[.!?]+\s*/g) || [];
+    const rest = line.replace(/[^.!?]+[.!?]+\s*/g, '').trim();
+    segments.push(...sentences);
+    if (rest) segments.push(rest);
+  }
+  if (!segments.length) return [text];
+
   const chunks = [];
   let cur = '';
-  for (const p of parts) {
-    if ((cur + p).length > maxLen && cur) { chunks.push(restore(cur.trim())); cur = p; }
-    else cur += p;
+  for (const seg of segments) {
+    const joined = cur ? cur + ' ' + seg.trim() : seg.trim();
+    if (joined.length > maxLen && cur) { chunks.push(restore(cur.trim())); cur = seg.trim(); }
+    else cur = joined;
   }
   if (cur.trim()) chunks.push(restore(cur.trim()));
   return chunks.length ? chunks : [text];
diff --git a/static/loader.js b/static/loader.js
index af80c29..1120e22 100644
--- a/static/loader.js
+++ b/static/loader.js
@@ -117,6 +117,7 @@
     '/static/js/voice-clone.js',
     '/static/js/voice-library.js',
     '/static/js/tts-preview.js',
+    '/static/js/generation.js',
     '/static/js/benchmark.js',
     '/static/js/stt.js',
     '/static/js/rehearser-parse.js',
@@ -152,12 +153,10 @@
   if (window.initAccessibilityEnhancements) window.initAccessibilityEnhancements();
 
   // E — post-init modules load in background AFTER the UI is already visible.
-  // Engines, AI backends, generation, and conversation sections load while
-  // the user browses Voices / Clone / Design, not before.
+  // Engines, AI backends, and conversation load while the user browses other tabs.
   _loadBatch([
     '/static/js/engines.js',
     '/static/js/ai-backends.js',
-    '/static/js/generation.js',
     '/static/js/conversation.js',
   ]);
 })();