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

2 files changed, 47 insertions, 19 deletions

diff --git a/hugolib/site_sections.go b/hugolib/site_sections.go
index 151baac84..891980be2 100644
--- a/hugolib/site_sections.go
+++ b/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 {
-			// We don't know what to do with this section yet.
-			undecided = append(undecided, p)
+			found = true
 		}
 
-		pagePath := path.Join(sectionKey, sectPageKey, strconv.Itoa(i))
-		inPages.Insert([]byte(pagePath), 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)
 
diff --git a/hugolib/site_sections_test.go b/hugolib/site_sections_test.go
index 78cf7eca4..4617c8fb3 100644
--- a/hugolib/site_sections_test.go
+++ b/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)