Misc permalinks adjustments

* Move config loading to the page package
* Fix a lower bound panic for the `:sections` slice syntax.
* Always return the `:title`
* Add some permalinks integration tests
* Also see issues below

Fixes #9448
Fixes #11184
See #8523

hugolib/content_map.go

@@ -680,7 +680,14 @@ func (m *contentMap) splitKey(k string) []string {
 		return nil
 	}
 
-	return strings.Split(k, "/")[1:]
+	parts := strings.Split(k, "/")[1:]
+	if len(parts) == 0 {
+		return nil
+	}
+	if parts[len(parts)-1] == "" {
+		parts = parts[:len(parts)-1]
+	}
+	return parts
 }
 
 func (m *contentMap) testDump() string {

hugolib/integrationtest_builder.go

@@ -205,6 +205,10 @@ func (s *IntegrationTestBuilder) Build() *IntegrationTestBuilder {
 	return s
 }
 
+func (s *IntegrationTestBuilder) LogString() string {
+	return s.logBuff.String()
+}
+
 func (s *IntegrationTestBuilder) BuildE() (*IntegrationTestBuilder, error) {
 	s.Helper()
 	if err := s.initBuilder(); err != nil {

hugolib/page__paths.go

@@ -109,13 +109,13 @@ func createTargetPathDescriptor(s *Site, p page.Page, pm *pageMeta) (page.Target
 	)
 
 	d := s.Deps
-	classifier := files.ContentClassZero
+	var classifier files.ContentClass
 
 	if !p.File().IsZero() {
 		dir = p.File().Dir()
 		baseName = p.File().TranslationBaseName()
 		contentBaseName = p.File().ContentBaseName()
-		classifier = p.File().Classifier()
+		classifier = p.File().FileInfo().Meta().Classifier
 	}
 
 	if classifier == files.ContentClassLeaf {

hugolib/site_url_test.go

@@ -160,3 +160,25 @@ Do not go gentle into that good night.
 	th.assertFileContent(filepath.Join("public", "ss1", "index.html"), "P1|URL: /ss1/|Next: /ss1/page/2/")
 	th.assertFileContent(filepath.Join("public", "ss1", "page", "2", "index.html"), "P2|URL: /ss1/page/2/|Next: /ss1/page/3/")
 }
+
+func TestSectionsEntries(t *testing.T) {
+	files := `
+-- hugo.toml --
+-- content/withfile/_index.md --
+-- content/withoutfile/p1.md --
+-- layouts/_default/list.html --
+SectionsEntries: {{ .SectionsEntries }}
+
+
+`
+
+	b := NewIntegrationTestBuilder(
+		IntegrationTestConfig{
+			T:           t,
+			TxtarString: files,
+		},
+	).Build()
+
+	b.AssertFileContent("public/withfile/index.html", "SectionsEntries: [withfile]")
+	b.AssertFileContent("public/withoutfile/index.html", "SectionsEntries: [withoutfile]")
+}