resources/page: Allow section and taxonomy pages to have a permalink configuration

Allows using permalink configuration for sections (branch bundles) and
also for taxonomy pages. Extends the current permalink configuration to
be able to specified per page kind while also staying backward compatible:
all permalink patterns not dedicated to a certain kind, get automatically
added for both normal pages and term pages.

Fixes #8523

resources/page/permalinks.go

@@ -26,6 +26,7 @@ import (
 	"errors"
 
 	"github.com/gohugoio/hugo/helpers"
+
 )
 
 // PermalinkExpander holds permalin mappings per section.
@@ -35,7 +36,7 @@ type PermalinkExpander struct {
 	// to be used to replace that tag.
 	knownPermalinkAttributes map[string]pageToPermaAttribute
 
-	expanders map[string]func(Page) (string, error)
+	expanders map[string]map[string]func(Page) (string, error)
 
 	urlize func(uri string) string
 }
@@ -68,7 +69,7 @@ func (p PermalinkExpander) callback(attr string) (pageToPermaAttribute, bool) {
 
 // NewPermalinkExpander creates a new PermalinkExpander configured by the given
 // urlize func.
-func NewPermalinkExpander(urlize func(uri string) string, patterns map[string]string) (PermalinkExpander, error) {
+func NewPermalinkExpander(urlize func(uri string) string, patterns map[string]map[string]string) (PermalinkExpander, error) {
 	p := PermalinkExpander{urlize: urlize}
 
 	p.knownPermalinkAttributes = map[string]pageToPermaAttribute{
@@ -87,12 +88,15 @@ func NewPermalinkExpander(urlize func(uri string) string, patterns map[string]st
 		"filename":       p.pageToPermalinkFilename,
 	}
 
-	e, err := p.parse(patterns)
-	if err != nil {
-		return p, err
-	}
+	p.expanders = make(map[string]map[string]func(Page) (string, error))
 
-	p.expanders = e
+	for kind, patterns := range patterns {
+		e, err := p.parse(patterns)
+		if err != nil {
+			return p, err
+		}
+		p.expanders[kind] = e
+	}
 
 	return p, nil
 }
@@ -100,7 +104,13 @@ func NewPermalinkExpander(urlize func(uri string) string, patterns map[string]st
 // Expand expands the path in p according to the rules defined for the given key.
 // If no rules are found for the given key, an empty string is returned.
 func (l PermalinkExpander) Expand(key string, p Page) (string, error) {
-	expand, found := l.expanders[key]
+	expanders, found := l.expanders[p.Kind()]
+
+	if !found {
+		return "", nil
+	}
+
+	expand, found := expanders[key]
 
 	if !found {
 		return "", nil
@@ -242,6 +252,10 @@ func (l PermalinkExpander) pageToPermalinkDate(p Page, dateField string) (string
 
 // pageToPermalinkTitle returns the URL-safe form of the title
 func (l PermalinkExpander) pageToPermalinkTitle(p Page, _ string) (string, error) {
+	if p.File().TranslationBaseName() == "_index" {
+		return "", nil
+	}
+
 	return l.urlize(p.Title()), nil
 }
 
@@ -252,6 +266,8 @@ func (l PermalinkExpander) pageToPermalinkFilename(p Page, _ string) (string, er
 		// Page bundles; the directory name will hopefully have a better name.
 		dir := strings.TrimSuffix(p.File().Dir(), helpers.FilePathSeparator)
 		_, name = filepath.Split(dir)
+	} else if name == "_index" {
+		return "", nil
 	}
 
 	return l.urlize(name), nil