45 lines
1.5 KiB
TypeScript
45 lines
1.5 KiB
TypeScript
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/** Truncate the first user message into a chat title. */
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export function deriveTitle(preview: string | undefined, fallback: string): string {
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if (!preview) return fallback;
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const oneLine = preview.replace(/\s+/g, " ").trim();
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if (!oneLine) return fallback;
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return oneLine.length > 60 ? `${oneLine.slice(0, 57)}…` : oneLine;
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}
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/** Loose ISO-or-epoch parser; returns ``null`` for missing/invalid input. */
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function parseDate(value: string | number | null | undefined): Date | null {
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if (value === null || value === undefined || value === "") return null;
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const d = new Date(value);
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return Number.isNaN(d.getTime()) ? null : d;
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}
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const RELATIVE_THRESHOLDS: [number, Intl.RelativeTimeFormatUnit][] = [
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[60, "second"],
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[60, "minute"],
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[24, "hour"],
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[7, "day"],
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[4.345, "week"],
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[12, "month"],
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[Number.POSITIVE_INFINITY, "year"],
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];
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const RTF = new Intl.RelativeTimeFormat(undefined, { numeric: "auto" });
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export function relativeTime(value: string | number | null | undefined): string {
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const date = parseDate(value);
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if (!date) return "";
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let delta = (date.getTime() - Date.now()) / 1000;
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for (const [step, unit] of RELATIVE_THRESHOLDS) {
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if (Math.abs(delta) < step) {
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return RTF.format(Math.round(delta), unit);
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}
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delta /= step;
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}
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return RTF.format(Math.round(delta), "year");
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}
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export function fmtDateTime(value: string | number | null | undefined): string {
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const date = parseDate(value);
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return date ? date.toLocaleString() : "";
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}
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