Files
nanobot/webui/src/lib/format.ts
T

78 lines
2.5 KiB
TypeScript

import i18n, { currentLocale } from "@/i18n";
/** Truncate the first user message into a chat title. */
export function deriveTitle(preview: string | undefined, fallback: string): string {
if (!preview) return fallback;
const oneLine = preview.replace(/\s+/g, " ").trim();
if (!oneLine) return fallback;
return oneLine.length > 60 ? `${oneLine.slice(0, 57)}…` : oneLine;
}
/** Loose ISO-or-epoch parser; returns ``null`` for missing/invalid input. */
function parseDate(value: string | number | null | undefined): Date | null {
if (value === null || value === undefined || value === "") return null;
const d = new Date(value);
return Number.isNaN(d.getTime()) ? null : d;
}
const RELATIVE_THRESHOLDS: [number, Intl.RelativeTimeFormatUnit][] = [
[60, "second"],
[60, "minute"],
[24, "hour"],
[7, "day"],
[4.345, "week"],
[12, "month"],
[Number.POSITIVE_INFINITY, "year"],
];
const relativeTimeFormatters = new Map<string, Intl.RelativeTimeFormat>();
const dateTimeFormatters = new Map<string, Intl.DateTimeFormat>();
function activeLocale(locale?: string): string {
return locale || i18n.resolvedLanguage || i18n.language || currentLocale();
}
function relativeTimeFormatter(locale: string): Intl.RelativeTimeFormat {
const existing = relativeTimeFormatters.get(locale);
if (existing) return existing;
const formatter = new Intl.RelativeTimeFormat(locale, { numeric: "auto" });
relativeTimeFormatters.set(locale, formatter);
return formatter;
}
function dateTimeFormatter(locale: string): Intl.DateTimeFormat {
const existing = dateTimeFormatters.get(locale);
if (existing) return existing;
const formatter = new Intl.DateTimeFormat(locale, {
dateStyle: "medium",
timeStyle: "short",
});
dateTimeFormatters.set(locale, formatter);
return formatter;
}
export function relativeTime(
value: string | number | null | undefined,
locale?: string,
): string {
const date = parseDate(value);
if (!date) return "";
let delta = (date.getTime() - Date.now()) / 1000;
const formatter = relativeTimeFormatter(activeLocale(locale));
for (const [step, unit] of RELATIVE_THRESHOLDS) {
if (Math.abs(delta) < step) {
return formatter.format(Math.round(delta), unit);
}
delta /= step;
}
return formatter.format(Math.round(delta), "year");
}
export function fmtDateTime(
value: string | number | null | undefined,
locale?: string,
): string {
const date = parseDate(value);
return date ? dateTimeFormatter(activeLocale(locale)).format(date) : "";
}