amosblomqvist
8a6eab0b6a
Owner round (2026-10-06, release polish #3): first messages are always long, and the auto-title's hard 72-char cut landed mid-word. The cut now snaps to the last word boundary at or under TITLE_MAX_CHARS (72, exported and tunable); whitespace collapses first so boundaries are single-space. The one special case (owner-specified): a single word longer than the cap — rare but real: identifiers, URLs — splits at the cap. A boundary landing exactly at the cap is a clean cut. Seam unchanged: titleFromPrompt (core/contracts/graph.ts), applied once server-side at chat creation. Pinned in tests/title-from-prompt.test.ts (6).
57 lines
2.5 KiB
TypeScript
57 lines
2.5 KiB
TypeScript
/**
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* The auto-title's smart truncation (owner, 2026-10-06): the cut snaps to
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* a word boundary at or under TITLE_MAX_CHARS (72); a single word longer
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* than the cap splits at the cap. Pure seam: titleFromPrompt in
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* core/contracts/graph.ts, applied server-side at chat creation (the one
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* seam — home and both drafts post raw text; the route derives).
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*/
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import assert from "node:assert/strict";
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import { describe, it } from "node:test";
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import { TITLE_MAX_CHARS, titleFromPrompt } from "../src/core/contracts/graph.ts";
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describe("titleFromPrompt (smart truncation)", () => {
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it("short prompts pass through untouched — no ellipsis, whitespace collapsed", () => {
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assert.equal(titleFromPrompt("Relational databases"), "Relational databases");
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assert.equal(titleFromPrompt("line one\nline two\ttabbed"), "line one line two tabbed");
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});
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it("exactly at the cap: unchanged, no ellipsis", () => {
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const exact = "a".repeat(TITLE_MAX_CHARS);
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assert.equal(titleFromPrompt(exact), exact);
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});
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it("over the cap: the cut snaps to the last word boundary under it", () => {
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// > 72 chars total so truncation actually fires.
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const words = ["teach", "me", "the", "relational", "model", "and", "its", "information", "principle", "underlying", "everything", "please"];
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const joined = words.join(" "); // 10 words, > 72 chars
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const out = titleFromPrompt(joined);
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assert.ok(out.endsWith("…"), "marks the truncation");
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assert.ok(!out.slice(0, -1).endsWith(" "), "… attaches directly to the kept word");
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// The kept prefix is a prefix of the original at a word boundary:
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const kept = out.slice(0, -1);
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assert.ok(joined.startsWith(kept));
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assert.ok(kept.length <= TITLE_MAX_CHARS);
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assert.equal(joined[kept.length], " ", "the cut dropped a whole word, never half of one");
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});
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it("boundary landing exactly at the cap is a clean cut (no mid-word split)", () => {
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const first = "b".repeat(TITLE_MAX_CHARS); // fills the cap exactly
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const prompt = `${first} then more words after it`;
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const out = titleFromPrompt(prompt);
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assert.equal(out, `${first}…`);
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});
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it("a single word longer than the cap splits at the cap", () => {
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const giant = "x".repeat(TITLE_MAX_CHARS + 30);
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assert.equal(titleFromPrompt(giant), `${"x".repeat(TITLE_MAX_CHARS)}…`);
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});
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it("the kept title never carries a trailing space", () => {
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const prompt = `${"c".repeat(60)} ${"d".repeat(60)}`; // collapses to one space
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const out = titleFromPrompt(prompt);
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assert.ok(!out.slice(0, -1).endsWith(" "));
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assert.ok(out.endsWith("…"));
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});
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});
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