hugolib: Add .Site.Sites

Fixes #5504

hugolib/hugo_sites.go

@@ -55,6 +55,14 @@ type HugoSites struct {
 	gitInfo *gitInfo
 }
 
+func (h *HugoSites) siteInfos() SiteInfos {
+	infos := make(SiteInfos, len(h.Sites))
+	for i, site := range h.Sites {
+		infos[i] = &site.Info
+	}
+	return infos
+}
+
 func (h *HugoSites) pickOneAndLogTheRest(errors []error) error {
 	if len(errors) == 0 {
 		return nil

hugolib/page.go

@@ -369,12 +369,7 @@ func (p *Page) Summary() template.HTML {
 
 // Sites is a convenience method to get all the Hugo sites/languages configured.
 func (p *Page) Sites() SiteInfos {
-	infos := make(SiteInfos, len(p.s.owner.Sites))
-	for i, site := range p.s.owner.Sites {
-		infos[i] = &site.Info
-	}
-
-	return infos
+	return p.s.owner.siteInfos()
 }
 
 // SearchKeywords implements the related.Document interface needed for fast page searches.

hugolib/site.go

@@ -424,6 +424,10 @@ func (s *SiteInfo) Hugo() hugo.Info {
 	return s.hugoInfo
 }
 
+// Sites is a convenience method to get all the Hugo sites/languages configured.
+func (s *SiteInfo) Sites() SiteInfos {
+	return s.s.owner.siteInfos()
+}
 func (s *SiteInfo) String() string {
 	return fmt.Sprintf("Site(%q)", s.Title)
 }

hugolib/template_test.go

@@ -242,6 +242,7 @@ func TestTemplateFuncs(t *testing.T) {
 	b := newTestSitesBuilder(t).WithDefaultMultiSiteConfig()
 
 	homeTpl := `Site: {{ site.Language.Lang }} / {{ .Site.Language.Lang }} / {{ site.BaseURL }}
+Sites: {{ site.Sites.First.Home.Language.Lang }}
 Hugo: {{ hugo.Generator }}
 `
 
@@ -252,8 +253,14 @@ Hugo: {{ hugo.Generator }}
 
 	b.CreateSites().Build(BuildCfg{})
 
-	b.AssertFileContent("public/en/index.html", "Site: en / en / http://example.com/blog",
+	b.AssertFileContent("public/en/index.html",
+		"Site: en / en / http://example.com/blog",
+		"Sites: en",
 		"Hugo: <meta name=\"generator\" content=\"Hugo")
-	b.AssertFileContent("public/fr/index.html", "Site: fr / fr / http://example.com/blog")
+	b.AssertFileContent("public/fr/index.html",
+		"Site: fr / fr / http://example.com/blog",
+		"Sites: en",
+		"Hugo: <meta name=\"generator\" content=\"Hugo",
+	)
 
 }