#428

frontend/src/lib/help.ts

@@ -13,12 +13,14 @@ export type HelpEditionText = {
 
 export type HelpSearchEntry = HelpEditionText & {
     identifier: string
+    language?:  string
     edition:    string }
 
 export type HelpEditionContent = HelpEditionText & { content: ComponentType }
 
 export type HelpEditionSource = HelpEditionText & { source: string }
 export type HelpChange = Pick<HelpSearchEntry, 'identifier' | 'edition' | 'title'> & {
+    language?: string
     pred: string | null
     change: 'new' | 'update'
     date: string }
@@ -82,6 +84,15 @@ export const getHelpArticle = async (identifier: string): Promise<ArticleMeta |
 }
 
 
+export const resolveHelpLanguage = (
+    article: ArticleMeta | null | undefined,
+    requestedLanguage: string,
+): string =>
+    article?.languages[requestedLanguage] != null
+    ? requestedLanguage
+    : article?.canonicalLanguage ?? 'ja'
+
+
 export const getHelpEditions = async (
     identifier: string,
     language: string,
@@ -144,7 +155,8 @@ export const getHelpSearchEntries = async (
     language: string,
 ): Promise<HelpSearchEntry[]> => {
   const { default: search } = await import ('virtual:help/search')
-  return search[language] ?? []
+  const contentLanguage = search[language] != null ? language : 'ja'
+  return (search[contentLanguage] ?? []).map (entry => ({ ...entry, language: contentLanguage }))
 }
 
 
@@ -163,13 +175,14 @@ export const getHelpEditionContent = async (
 
 export const getHelpChanges = async (language: string): Promise<HelpChange[]> => {
   const { default: changes } = await import ('virtual:help/changes')
-  return changes[language] ?? []
+  const contentLanguage = changes[language] != null ? language : 'ja'
+  return (changes[contentLanguage] ?? []).map (entry => ({ ...entry, language: contentLanguage }))
 }
 
 
 export const getHelpTitleIndex = async (language: string): Promise<HelpTitleIndex> => {
   const { default: titles } = await import ('virtual:help/titles')
-  return titles[language] ?? { }
+  return titles[language] ?? titles.ja ?? { }
 }