hugolib: Fix section logic for root folders with subfolders

This commit fixes an issue introduced in the recently released Hugo 0.22.

This logic did not handle the case with root sections with non-section subfolders very well.

Fixes #3586

hugolib/site_sections.go

@@ -154,13 +154,25 @@ func (s *Site) assembleSections() Pages {
 			sect = s.newSectionPage(p.sections[0])
 			sectionPages[sectionKey] = sect
 			newPages = append(newPages, sect)
-		} else if !found {
+			found = true
-			// We don't know what to do with this section yet.
-			undecided = append(undecided, p)
 		}
 
+		if len(p.sections) > 1 {
+			// Create the root section if not found.
+			_, rootFound := sectionPages[p.sections[0]]
+			if !rootFound {
+				sect = s.newSectionPage(p.sections[0])
+				sectionPages[p.sections[0]] = sect
+				newPages = append(newPages, sect)
+			}
+		}
+
+		if found {
 			pagePath := path.Join(sectionKey, sectPageKey, strconv.Itoa(i))
 			inPages.Insert([]byte(pagePath), p)
+		} else {
+			undecided = append(undecided, p)
+		}
 	}
 
 	// Create any missing sections in the tree.
@@ -181,17 +193,6 @@ func (s *Site) assembleSections() Pages {
 		}
 	}
 
-	// Create any missing root sections.
-	for _, p := range undecided {
-		sectionKey := p.sections[0]
-		sect, found := sectionPages[sectionKey]
-		if !found {
-			sect = s.newSectionPage(sectionKey)
-			sectionPages[sectionKey] = sect
-			newPages = append(newPages, sect)
-		}
-	}
-
 	for k, sect := range sectionPages {
 		inPages.Insert([]byte(path.Join(k, sectSectKey)), sect)
 		inSections.Insert([]byte(k), sect)
@@ -200,10 +201,20 @@ func (s *Site) assembleSections() Pages {
 	var (
 		currentSection *Page
 		children       Pages
-		rootPages      = inPages.Commit().Root()
 		rootSections   = inSections.Commit().Root()
 	)
 
+	for i, p := range undecided {
+		// Now we can decide where to put this page into the tree.
+		sectionKey := path.Join(p.sections...)
+		_, v, _ := rootSections.LongestPrefix([]byte(sectionKey))
+		sect := v.(*Page)
+		pagePath := path.Join(path.Join(sect.sections...), sectSectKey, "u", strconv.Itoa(i))
+		inPages.Insert([]byte(pagePath), p)
+	}
+
+	var rootPages = inPages.Commit().Root()
+
 	rootPages.Walk(func(path []byte, v interface{}) bool {
 		p := v.(*Page)
 

hugolib/site_sections_test.go

@@ -58,6 +58,11 @@ Content
 			fmt.Sprintf(pageTemplate, 1, level1))
 	}
 
+	// Issue #3586
+	writeSource(t, fs, filepath.Join("content", "post", "0000.md"), fmt.Sprintf(pageTemplate, 1, 2))
+	writeSource(t, fs, filepath.Join("content", "post", "0000", "0001.md"), fmt.Sprintf(pageTemplate, 1, 3))
+	writeSource(t, fs, filepath.Join("content", "elsewhere", "0003.md"), fmt.Sprintf(pageTemplate, 1, 4))
+
 	// Empty nested section, i.e. no regular content pages.
 	writeSource(t, fs, filepath.Join("content", "empty1", "b", "c", "_index.md"), fmt.Sprintf(pageTemplate, 33, -1))
 	// Index content file a the end and in the middle.
@@ -109,12 +114,24 @@ PAG|{{ .Title }}|{{ $sect.InSection . }}
 	cfg.Set("paginate", 2)
 
 	s := buildSingleSite(t, deps.DepsCfg{Fs: fs, Cfg: cfg}, BuildCfg{})
-	require.Len(t, s.RegularPages, 18)
+	require.Len(t, s.RegularPages, 21)
 
 	tests := []struct {
 		sections string
 		verify   func(p *Page)
 	}{
+		{"elsewhere", func(p *Page) {
+			assert.Len(p.Pages, 1)
+			for _, p := range p.Pages {
+				assert.Equal([]string{"elsewhere"}, p.sections)
+			}
+		}},
+		{"post", func(p *Page) {
+			assert.Len(p.Pages, 2)
+			for _, p := range p.Pages {
+				assert.Equal("post", p.Section())
+			}
+		}},
 		{"empty1", func(p *Page) {
 			// > b,c
 			assert.NotNil(p.s.getPage(KindSection, "empty1", "b"))
@@ -228,7 +245,7 @@ PAG|{{ .Title }}|{{ $sect.InSection . }}
 
 	assert.NotNil(home)
 
-	assert.Len(home.Sections(), 7)
+	assert.Len(home.Sections(), 9)
 
 	rootPage := s.getPage(KindPage, "mypage.md")
 	assert.NotNil(rootPage)