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Fix newline chunking: split on blank lines even under limit

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This commit is contained in:
Tyler Yust
2026-01-24 23:30:14 -08:00
committed by Peter Steinberger
parent 46fa1c1301
commit 0975aa4a7c
1 changed files with 15 additions and 45 deletions
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60
src/auto-reply/chunk.ts
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@@ -177,69 +177,39 @@ export function chunkByNewline(
export function chunkByParagraph(text: string, limit: number): string[] {
if (!text) return [];
if (limit <= 0) return [text];
if (text.length <= limit) return [text];
// Normalize to \n so blank line detection is consistent.
const normalized = text.replace(/\r\n?/g, "\n");
const parts: string[] = [];
const seps: string[] = [];
// Fast-path: if there are no blank-line paragraph separators, do not split.
// (We *do not* early-return based on `limit` — newline mode is about paragraph
// boundaries, not only exceeding a length limit.)
const paragraphRe = /\n[\t ]*\n+/;
if (!paragraphRe.test(normalized)) {
return normalized.length <= limit ? [normalized] : chunkText(normalized, limit);
}
const parts: string[] = [];
const re = /\n[\t ]*\n+/g; // paragraph break: blank line(s), allowing whitespace
let lastIndex = 0;
for (const match of normalized.matchAll(re)) {
const idx = match.index ?? 0;
parts.push(normalized.slice(lastIndex, idx));
seps.push(match[0]);
lastIndex = idx + match[0].length;
}
parts.push(normalized.slice(lastIndex));
const chunks: string[] = [];
let current = "";
let pendingSep = "";
const flush = () => {
const out = current.trimEnd();
if (out) chunks.push(out);
current = "";
};
for (let i = 0; i < parts.length; i++) {
const paragraph = parts[i] ?? "";
if (!paragraph.trim() && i === parts.length - 1) break;
const prefix = pendingSep;
pendingSep = seps[i] ?? "";
const candidate = current
? `${current}${prefix}${paragraph}`
: // Cap leading blank lines so we never exceed `limit` with just prefixes.
`${prefix.slice(0, Math.max(0, limit - 1))}${paragraph}`;
if (candidate.length <= limit) {
current = candidate;
continue;
for (const part of parts) {
const paragraph = part.replace(/\s+$/g, "");
if (!paragraph.trim()) continue;
if (paragraph.length <= limit) {
chunks.push(paragraph);
} else {
chunks.push(...chunkText(paragraph, limit));
}
// Can't fit this paragraph into the current chunk.
if (current) flush();
const paragraphWithPrefix = `${prefix}${paragraph}`;
if (paragraphWithPrefix.length <= limit) {
current = paragraphWithPrefix;
continue;
}
// Paragraph itself is too long; split it by length (preferring newlines/whitespace).
const prefixCap = prefix.slice(0, Math.max(0, limit - 1));
const remainingLimit = Math.max(1, limit - prefixCap.length);
const [first, ...rest] = chunkText(paragraph, remainingLimit);
if (first) chunks.push(prefixCap + first);
chunks.push(...rest);
}
if (current.trim()) flush();
return chunks;
}