130 lines
5.3 KiB
Diff
130 lines
5.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Modrinth Enhanced <patches@modrinth-enhanced.invalid>
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Date: Fri, 18 Sep 2026 10:24:21 +0200
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Subject: [PATCH] Start in the language the system is set to
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The app started in English until someone found the language setting,
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even on a desktop that is not in English. The first start now takes the
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language from the system, as long as upstream has that one translated to
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at least 70 percent - below that the app would be half English anyway,
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which reads worse than all of it being. The system is only asked once,
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and never over a language that was picked in the settings.
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---
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apps/app-frontend/src/App.vue | 17 ++++-
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.../app-frontend/src/helpers/system-locale.ts | 71 +++++++++++++++++++
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2 files changed, 85 insertions(+), 3 deletions(-)
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create mode 100644 apps/app-frontend/src/helpers/system-locale.ts
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diff --git a/apps/app-frontend/src/App.vue b/apps/app-frontend/src/App.vue
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index cb688fc..bb4aa89 100644
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--- a/apps/app-frontend/src/App.vue
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+++ b/apps/app-frontend/src/App.vue
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@@ -166,6 +166,7 @@ import {
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syncedServersQueryOptions,
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} from '@/helpers/synced-options'
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import { syncedPackQueryOptions } from '@/helpers/synced-packs'
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+import { localeFromSystem } from '@/helpers/system-locale'
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import { get_user_preferences } from '@/helpers/user-preferences.ts'
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import { parse_modrinth_user_link } from '@/helpers/users'
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import {
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@@ -952,9 +953,19 @@ async function setupApp() {
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pending_update_toast_for_version,
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} = await traceStartupStep('Read startup settings', getSettings)
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- // Initialize locale from saved settings
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- if (locale) {
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- await traceStartupStep('Apply startup locale', () => setLocale(locale))
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+ // Initialize locale from saved settings, or on the very first start from the
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+ // language the desktop is set to.
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+ const startupLocale =
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+ (await traceStartupStep('Read the system language', () => localeFromSystem(locale)).catch(
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+ () => undefined,
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+ )) ?? locale
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+ if (startupLocale) {
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+ await traceStartupStep('Apply startup locale', () => setLocale(startupLocale))
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+ }
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+ if (startupLocale !== locale) {
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+ await getSettings()
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+ .then((settings) => setSettings({ ...settings, locale: startupLocale }))
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+ .catch(handleError)
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}
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Object.assign(appSettings.featureFlags, feature_flags)
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diff --git a/apps/app-frontend/src/helpers/system-locale.ts b/apps/app-frontend/src/helpers/system-locale.ts
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new file mode 100644
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index 0000000..2e98fa7
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--- /dev/null
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+++ b/apps/app-frontend/src/helpers/system-locale.ts
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@@ -0,0 +1,71 @@
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+/**
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+ * The language the app starts in the first time it runs, taken from the one the
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+ * desktop is set to.
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+ *
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+ * Only languages upstream has translated far enough are taken. Below that the
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+ * app would be half English anyway, which reads worse than all of it being.
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+ */
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+import { LOCALES } from '@modrinth/ui'
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+import { languageCoverage } from '@modrinth/ui/src/layouts/wrapped/settings/language-settings/language-settings-coverage.generated'
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+import { locale as osLocale } from '@tauri-apps/plugin-os'
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+
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+/** How much of the app has to be in a language for it to be picked. */
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+const MIN_COVERAGE = 70
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+
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+/** Written once the system has been asked, so that only ever happens once. */
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+const ASKED_KEY = 'modrinth-enhanced:language-from-system'
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+
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+/** Windows says zh-Hans-CN; the script is what tells the two Chinese apart. */
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+const BY_SCRIPT: Record<string, string> = { hans: 'zh-CN', hant: 'zh-TW' }
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+
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+function coverage(code: string): number {
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+ return languageCoverage.app[code]?.percentage ?? 0
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+}
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+
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+/** The language the app calls a tag that is not one of its own codes. */
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+function preferred(language: string, region: string | undefined, script: string | undefined) {
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+ if (script) return BY_SCRIPT[script]
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+ // Spanish outside Spain is the Latin American one.
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+ if (language === 'es' && region && region !== 'es') return 'es-419'
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+ // Otherwise the country the language is named after: de → de-DE, fr → fr-FR.
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+ return `${language}-${language.toUpperCase()}`
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+}
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+
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+/** The best translated language the app has for `tag`, if it has one at all. */
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+function bestMatch(tag: string): string | undefined {
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+ // de_DE.UTF-8 is a language, a country and how it is encoded.
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+ const wanted = tag
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+ .replace(/[.@].*$/, '')
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+ .replaceAll('_', '-')
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+ .toLowerCase()
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+ const parts = wanted.split('-')
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+ const [language, region] = [parts[0], parts.at(-1)]
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+ const second = preferred(
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+ language,
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+ region,
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+ parts.find((part) => part in BY_SCRIPT),
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+ )
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+
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+ const rank = (code: string) => (code.toLowerCase() === wanted ? 2 : code === second ? 1 : 0)
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+
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+ return LOCALES.map((locale) => locale.code)
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+ .filter((code) => code.split('-')[0] === language)
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+ .sort((a, b) => rank(b) - rank(a) || coverage(b) - coverage(a))
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+ .find((code) => coverage(code) >= MIN_COVERAGE)
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+}
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+
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+/**
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+ * The language to start in, or nothing to stay with `current`.
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+ *
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+ * The system is only asked once, and never over a language that was picked in
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+ * the settings.
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+ */
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+export async function localeFromSystem(current: string): Promise<string | undefined> {
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+ if (localStorage.getItem(ASKED_KEY) || (current && current !== 'en-US')) return undefined
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+
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+ const system = await osLocale().catch(() => null)
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+ localStorage.setItem(ASKED_KEY, new Date().toISOString())
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+
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+ const match = bestMatch(system ?? navigator.language ?? '')
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+ return match && match !== current ? match : undefined
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+}
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