Merge cc08a46b66 into a3324ff65e

packages/docusaurus-types/src/i18n.d.ts

@@ -37,6 +37,21 @@ export type I18nLocaleConfig = {
    * By default, it will only be run if the `./i18n/<locale>` exists.
    */
   translate: boolean;
+
+  /**
+   * The baseUrl to use for this locale.
+   * This overrides the `siteConfig.baseUrl` attribute.
+   *
+   * Default values:
+   * - Default locale: `/${siteConfig.baseUrl}/`
+   * - Other locales: `/${siteConfig.baseUrl}/<locale>/`
+   *
+   * Exception: when using the CLI with a single `--locale` parameter, the
+   * `/<locale>/` path segment is not included. This is a better default for
+   * sites looking to deploy each locale to a different subdomain, such as
+   * `https://<locale>.docusaurus.io`
+   */
+  baseUrl: string;
 };
 
 export type I18nConfig = {

packages/docusaurus/src/server/__tests__/i18n.test.ts

@@ -19,10 +19,12 @@ const loadI18nSiteDir = path.resolve(
 
 function loadI18nTest({
   siteDir = loadI18nSiteDir,
+  baseUrl = '/',
   i18nConfig,
   currentLocale,
 }: {
   siteDir?: string;
+  baseUrl?: string;
   i18nConfig: I18nConfig;
   currentLocale: string;
 }) {
@@ -30,6 +32,7 @@ function loadI18nTest({
     siteDir,
     config: {
       i18n: i18nConfig,
+      baseUrl,
     } as DocusaurusConfig,
     currentLocale,
   });
@@ -133,6 +136,7 @@ describe('loadI18n', () => {
         en: {
           ...getDefaultLocaleConfig('en'),
           translate: false,
+          baseUrl: '/',
         },
       },
     });
@@ -158,14 +162,17 @@ describe('loadI18n', () => {
         en: {
           ...getDefaultLocaleConfig('en'),
           translate: false,
+          baseUrl: '/en/',
         },
         fr: {
           ...getDefaultLocaleConfig('fr'),
           translate: true,
+          baseUrl: '/',
         },
         de: {
           ...getDefaultLocaleConfig('de'),
           translate: true,
+          baseUrl: '/de/',
         },
       },
     });
@@ -191,14 +198,17 @@ describe('loadI18n', () => {
         en: {
           ...getDefaultLocaleConfig('en'),
           translate: false,
+          baseUrl: '/en/',
         },
         fr: {
           ...getDefaultLocaleConfig('fr'),
           translate: true,
+          baseUrl: '/',
         },
         de: {
           ...getDefaultLocaleConfig('de'),
           translate: true,
+          baseUrl: '/de/',
         },
       },
     });
@@ -213,10 +223,11 @@ describe('loadI18n', () => {
           locales: ['en', 'fr', 'de'],
           localeConfigs: {
             fr: {label: 'Français', translate: false},
-            en: {translate: true},
-            de: {translate: false},
+            en: {translate: true, baseUrl: 'en-EN/whatever/else'},
+            de: {translate: false, baseUrl: '/de-DE/'},
           },
         },
+
         currentLocale: 'de',
       }),
     ).resolves.toEqual({
@@ -232,19 +243,58 @@ describe('loadI18n', () => {
           calendar: 'gregory',
           path: 'fr',
           translate: false,
+          baseUrl: '/',
         },
         en: {
           ...getDefaultLocaleConfig('en'),
           translate: true,
+          baseUrl: '/en-EN/whatever/else/',
         },
         de: {
           ...getDefaultLocaleConfig('de'),
           translate: false,
+          baseUrl: '/de-DE/',
         },
       },
     });
   });
 
+  it('loads I18n for multi-locale config with baseUrl edge cases', async () => {
+    await expect(
+      loadI18nTest({
+        baseUrl: 'siteBaseUrl',
+        i18nConfig: {
+          path: 'i18n',
+          defaultLocale: 'fr',
+          locales: ['en', 'fr', 'de', 'pt'],
+          localeConfigs: {
+            fr: {},
+            en: {baseUrl: ''},
+            de: {baseUrl: '/de-DE/'},
+          },
+        },
+        currentLocale: 'de',
+      }),
+    ).resolves.toEqual(
+      expect.objectContaining({
+        localeConfigs: {
+          fr: expect.objectContaining({
+            baseUrl: '/siteBaseUrl/',
+          }),
+          en: expect.objectContaining({
+            baseUrl: '/',
+          }),
+          de: expect.objectContaining({
+            baseUrl: '/de-DE/',
+          }),
+          pt: expect.objectContaining({
+            baseUrl: '/siteBaseUrl/pt/',
+          }),
+        },
+      }),
+    );
+  });
+
   it('warns when trying to load undeclared locale', async () => {
     await loadI18nTest({
       i18nConfig: {

packages/docusaurus/src/server/i18n.ts

@@ -9,6 +9,7 @@ import path from 'path';
 import fs from 'fs-extra';
 import logger from '@docusaurus/logger';
 import combinePromises from 'combine-promises';
+import {normalizeUrl} from '@docusaurus/utils';
 import type {I18n, DocusaurusConfig, I18nLocaleConfig} from '@docusaurus/types';
 
 function inferLanguageDisplayName(locale: string) {
@@ -82,7 +83,7 @@ function getDefaultDirection(localeStr: string) {
 
 export function getDefaultLocaleConfig(
   locale: string,
-): Omit<I18nLocaleConfig, 'translate'> {
+): Omit<I18nLocaleConfig, 'translate' | 'baseUrl'> {
   try {
     return {
       label: getDefaultLocaleLabel(locale),
@@ -123,7 +124,7 @@ Note: Docusaurus only support running one locale at a time.`;
     locale: string,
   ): Promise<I18nLocaleConfig> {
     const localeConfigInput = i18nConfig.localeConfigs[locale] ?? {};
-    const localeConfig: Omit<I18nLocaleConfig, 'translate'> = {
+    const localeConfig: Omit<I18nLocaleConfig, 'translate' | 'baseUrl'> = {
       ...getDefaultLocaleConfig(locale),
       ...localeConfigInput,
     };
@@ -138,10 +139,31 @@ Note: Docusaurus only support running one locale at a time.`;
       return fs.pathExists(localizationDir);
     }
 
+    function getBaseUrl(): string {
+      if (typeof localeConfigInput.baseUrl !== 'undefined') {
+        return normalizeUrl(['/', localeConfigInput.baseUrl, '/']);
+      }
+
+      // TODO CLI locales.length === 1 case - retro compat
+      const hasLocaleSegment = locale !== i18nConfig.defaultLocale;
+
+      return normalizeUrl([
+        '/',
+        config.baseUrl,
+        hasLocaleSegment ? locale : '',
+        '/',
+      ]);
+    }
+
     const translate = localeConfigInput.translate ?? (await inferTranslate());
+    const baseUrl =
+      typeof localeConfigInput.baseUrl !== 'undefined'
+        ? normalizeUrl(['/', localeConfigInput.baseUrl, '/'])
+        : getBaseUrl();
     return {
       ...localeConfig,
       translate,
+      baseUrl,
     };
   }