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opencode/packages/console/app/src/lib/language.ts

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+export const LOCALES = [
+  "en",
+  "zh",
+  "zht",
+  "ko",
+  "de",
+  "es",
+  "fr",
+  "it",
+  "da",
+  "ja",
+  "pl",
+  "ru",
+  "ar",
+  "no",
+  "br",
+  "th",
+  "tr",
+] as const
+
+export type Locale = (typeof LOCALES)[number]
+
+export const LOCALE_COOKIE = "oc_locale" as const
+export const LOCALE_HEADER = "x-opencode-locale" as const
+
+function fix(pathname: string) {
+  if (pathname.startsWith("/")) return pathname
+  return `/${pathname}`
+}
+
+const LABEL = {
+  en: "English",
+  zh: "简体中文",
+  zht: "繁體中文",
+  ko: "한국어",
+  de: "Deutsch",
+  es: "Español",
+  fr: "Français",
+  it: "Italiano",
+  da: "Dansk",
+  ja: "日本語",
+  pl: "Polski",
+  ru: "Русский",
+  ar: "العربية",
+  no: "Norsk",
+  br: "Português (Brasil)",
+  th: "ไทย",
+  tr: "Türkçe",
+} satisfies Record<Locale, string>
+
+const TAG = {
+  en: "en",
+  zh: "zh-Hans",
+  zht: "zh-Hant",
+  ko: "ko",
+  de: "de",
+  es: "es",
+  fr: "fr",
+  it: "it",
+  da: "da",
+  ja: "ja",
+  pl: "pl",
+  ru: "ru",
+  ar: "ar",
+  no: "no",
+  br: "pt-BR",
+  th: "th",
+  tr: "tr",
+} satisfies Record<Locale, string>
+
+export function parseLocale(value: unknown): Locale | null {
+  if (typeof value !== "string") return null
+  if ((LOCALES as readonly string[]).includes(value)) return value as Locale
+  return null
+}
+
+export function fromPathname(pathname: string) {
+  return parseLocale(fix(pathname).split("/")[1])
+}
+
+export function strip(pathname: string) {
+  const locale = fromPathname(pathname)
+  if (!locale) return fix(pathname)
+
+  const next = fix(pathname).slice(locale.length + 1)
+  if (!next) return "/"
+  if (next.startsWith("/")) return next
+  return `/${next}`
+}
+
+export function route(locale: Locale, pathname: string) {
+  const next = strip(pathname)
+  if (next.startsWith("/docs")) return next
+  if (next.startsWith("/auth")) return next
+  if (next.startsWith("/workspace")) return next
+  if (locale === "en") return next
+  if (next === "/") return `/${locale}`
+  return `/${locale}${next}`
+}
+
+export function label(locale: Locale) {
+  return LABEL[locale]
+}
+
+export function tag(locale: Locale) {
+  return TAG[locale]
+}
+
+export function dir(locale: Locale) {
+  if (locale === "ar") return "rtl"
+  return "ltr"
+}
+
+function match(input: string): Locale | null {
+  const value = input.trim().toLowerCase()
+  if (!value) return null
+
+  if (value.startsWith("zh")) {
+    if (value.includes("hant") || value.includes("-tw") || value.includes("-hk") || value.includes("-mo")) return "zht"
+    return "zh"
+  }
+
+  if (value.startsWith("ko")) return "ko"
+  if (value.startsWith("de")) return "de"
+  if (value.startsWith("es")) return "es"
+  if (value.startsWith("fr")) return "fr"
+  if (value.startsWith("it")) return "it"
+  if (value.startsWith("da")) return "da"
+  if (value.startsWith("ja")) return "ja"
+  if (value.startsWith("pl")) return "pl"
+  if (value.startsWith("ru")) return "ru"
+  if (value.startsWith("ar")) return "ar"
+  if (value.startsWith("tr")) return "tr"
+  if (value.startsWith("th")) return "th"
+  if (value.startsWith("pt")) return "br"
+  if (value.startsWith("no") || value.startsWith("nb") || value.startsWith("nn")) return "no"
+  if (value.startsWith("en")) return "en"
+  return null
+}
+
+export function detectFromLanguages(languages: readonly string[]) {
+  for (const language of languages) {
+    const locale = match(language)
+    if (locale) return locale
+  }
+  return "en" satisfies Locale
+}
+
+export function detectFromAcceptLanguage(header: string | null) {
+  if (!header) return "en" satisfies Locale
+
+  const items = header
+    .split(",")
+    .map((raw) => raw.trim())
+    .filter(Boolean)
+    .map((raw) => {
+      const parts = raw.split(";").map((x) => x.trim())
+      const lang = parts[0] ?? ""
+      const q = parts
+        .slice(1)
+        .find((x) => x.startsWith("q="))
+        ?.slice(2)
+      return {
+        lang,
+        q: q ? Number.parseFloat(q) : 1,
+      }
+    })
+    .sort((a, b) => b.q - a.q)
+
+  for (const item of items) {
+    if (!item.lang || item.lang === "*") continue
+    const locale = match(item.lang)
+    if (locale) return locale
+  }
+
+  return "en" satisfies Locale
+}
+
+export function localeFromCookieHeader(header: string | null) {
+  if (!header) return null
+
+  const raw = header
+    .split(";")
+    .map((x) => x.trim())
+    .find((x) => x.startsWith(`${LOCALE_COOKIE}=`))
+    ?.slice(`${LOCALE_COOKIE}=`.length)
+
+  if (!raw) return null
+  return parseLocale(decodeURIComponent(raw))
+}
+
+export function localeFromRequest(request: Request) {
+  const fromHeader = parseLocale(request.headers.get(LOCALE_HEADER))
+  if (fromHeader) return fromHeader
+
+  const fromPath = fromPathname(new URL(request.url).pathname)
+  if (fromPath) return fromPath
+
+  return (
+    localeFromCookieHeader(request.headers.get("cookie")) ??
+    detectFromAcceptLanguage(request.headers.get("accept-language"))
+  )
+}
+
+export function cookie(locale: Locale) {
+  return `${LOCALE_COOKIE}=${encodeURIComponent(locale)}; Path=/; Max-Age=31536000; SameSite=Lax`
+}
+
+export function clearCookie() {
+  return `${LOCALE_COOKIE}=; Path=/; Max-Age=0; SameSite=Lax`
+}