func reverseAppsArticle(a *app.App, art interface{}, checked map[*app.App]bool) (string, error) {
checked[a] = true
var articles []*article.Article
aa, _ := reusableapp.AppData(a).(*appData)
if aa != nil {
articles = aa.Articles
}
switch x := art.(type) {
case string:
for _, v := range articles {
if articleId(v) == x {
return a.Reverse(ArticleHandlerName, v.Slug())
}
}
case *article.Article:
return a.Reverse(ArticleHandlerName, x.Slug())
case article.Article:
return a.Reverse(ArticleHandlerName, x.Slug())
}
if p := a.Parent(); p != nil && !checked[p] {
return reverseAppsArticle(p, art, checked)
}
for _, v := range a.Included() {
if checked[v] {
continue
}
if url, err := reverseAppsArticle(v, art, checked); err == nil {
return url, nil
}
}
if id, ok := art.(string); ok {
return "", fmt.Errorf("no article with id %q found", id)
}
return "", fmt.Errorf("can't reverse Article from %T, must be *Article or string (article id)", art)
}
// AppDataWithKey works similarly to AppData, but uses the provided key instead.
// Also, if the data is not found in the *app.App passed in as the first argument,
// its children apps are also searched. This allows reusable apps to retrieve their
// additional data in contexts where the reusable app pointer is not available.
// (e.g. in template plugins which are called from the parent app). See gnd.la/apps/users
// for an example of this usage.
func AppDataWithKey(a *app.App, key interface{}) interface{} {
ra, _ := a.Get(key).(*App)
if ra != nil {
return ra.Data()
}
if key != reusableAppKey {
for _, ia := range a.Included() {
if data := AppDataWithKey(ia, key); data != nil {
return data
}
}
}
return nil
}