Add Sections to Site interface

See https://github.com/gohugoio/hugo/issues/10947#issuecomment-1550012671

Updates #10947

hugolib/config_test.go

@@ -741,3 +741,30 @@ themeconfigdirparam: {{ site.Params.themeconfigdirparam }}
 	}
 
 }
+
+// TODO(beo) find a better place for this.
+func TestReproCommentsIn10947(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- hugo.toml --
+baseURL = "https://example.com"
+-- content/mysection/_index.md --
+---
+title: "My Section"
+---
+-- layouts/index.html --
+Sections: {{ if site.Sections }}true{{ end }}|
+
+
+`
+	b := NewIntegrationTestBuilder(
+		IntegrationTestConfig{
+			T:           t,
+			TxtarString: files,
+		},
+	).Build()
+
+	b.AssertFileContent("public/index.html", "Sections: true|")
+
+}

resources/page/site.go

@@ -43,6 +43,9 @@ type Site interface {
 	// Returns all Pages in this Site.
 	Pages() Pages
 
+	// Returns all the top level sections.
+	Sections() Pages
+
 	// A shortcut to the home
 	Home() Page
 
@@ -164,6 +167,10 @@ func (s *siteWrapper) Pages() Pages {
 	return s.s.Pages()
 }
 
+func (s *siteWrapper) Sections() Pages {
+	return s.s.Sections()
+}
+
 func (s *siteWrapper) Home() Page {
 	return s.s.Home()
 }
@@ -285,6 +292,10 @@ func (t testSite) Sites() Sites {
 	return nil
 }
 
+func (t testSite) Sections() Pages {
+	return nil
+}
+
 func (t testSite) GetPage(ref ...string) (Page, error) {
 	return nil, nil
 }