resources/page: Add :contentbasename and :contentbasenameorslug permalink tokens

See #11722

Author: hacdias

docs/content/en/content-management/urls.md

@@ -317,6 +317,14 @@ Use these tokens when defining the URL pattern. You can also use these tokens wh
 `:slugorfilename`
 : The slug as defined in front matter, else the content's file name without extension, applicable to the `page` page kind.
 
+`:contentbasename`
+: The content base name, as defined in [`File.ContentBaseName`], applicable to pages backed by a file.
+
+`:contentbasenameorslug`
+: The content base name, else the slug as defined above.
+
+[`File.ContentBaseName`]: /methods/page/file/#contentbasename
+
 For time-related values, you can also use the layout string components defined in Go's [time package]. For example:
 
 [time package]: https://pkg.go.dev/time#pkg-constants

resources/page/permalinks.go

@@ -79,19 +79,21 @@ func NewPermalinkExpander(urlize func(uri string) string, patterns map[string]ma
 	}
 
 	p.knownPermalinkAttributes = map[string]pageToPermaAttribute{
-		"year":           p.pageToPermalinkDate,
-		"month":          p.pageToPermalinkDate,
-		"monthname":      p.pageToPermalinkDate,
-		"day":            p.pageToPermalinkDate,
-		"weekday":        p.pageToPermalinkDate,
-		"weekdayname":    p.pageToPermalinkDate,
-		"yearday":        p.pageToPermalinkDate,
-		"section":        p.pageToPermalinkSection,
-		"sections":       p.pageToPermalinkSections,
-		"title":          p.pageToPermalinkTitle,
-		"slug":           p.pageToPermalinkSlugElseTitle,
-		"slugorfilename": p.pageToPermalinkSlugElseFilename,
-		"filename":       p.pageToPermalinkFilename,
+		"year":                  p.pageToPermalinkDate,
+		"month":                 p.pageToPermalinkDate,
+		"monthname":             p.pageToPermalinkDate,
+		"day":                   p.pageToPermalinkDate,
+		"weekday":               p.pageToPermalinkDate,
+		"weekdayname":           p.pageToPermalinkDate,
+		"yearday":               p.pageToPermalinkDate,
+		"section":               p.pageToPermalinkSection,
+		"sections":              p.pageToPermalinkSections,
+		"title":                 p.pageToPermalinkTitle,
+		"slug":                  p.pageToPermalinkSlugElseTitle,
+		"slugorfilename":        p.pageToPermalinkSlugElseFilename,
+		"filename":              p.pageToPermalinkFilename,
+		"contentbasename":       p.pageToPermalinkContentBaseName,
+		"contentbasenameorslug": p.pageToPermalinkContentBaseNameOrSlug,
 	}
 
 	p.expanders = make(map[string]map[string]func(Page) (string, error))
@@ -307,6 +309,26 @@ func (l PermalinkExpander) pageToPermalinkSections(p Page, _ string) (string, er
 	return p.CurrentSection().SectionsPath(), nil
 }
 
+// pageToPermalinkContentBaseName returns the URL-safe form of the content base name.
+func (l PermalinkExpander) pageToPermalinkContentBaseName(p Page, _ string) (string, error) {
+	if p.File() == nil {
+		return "", nil
+	}
+	return l.urlize(p.File().ContentBaseName()), nil
+}
+
+// pageToPermalinkContentBaseNameOrSlug returns the URL-safe form of the content base name, or the slug.
+func (l PermalinkExpander) pageToPermalinkContentBaseNameOrSlug(p Page, a string) (string, error) {
+	name, err := l.pageToPermalinkContentBaseName(p, a)
+	if err != nil {
+		return "", nil
+	}
+	if name != "" {
+		return name, nil
+	}
+	return l.pageToPermalinkSlugElseTitle(p, a)
+}
+
 func (l PermalinkExpander) translationBaseName(p Page) string {
 	if p.File() == nil {
 		return ""

resources/page/permalinks_test.go

@@ -46,6 +46,8 @@ var testdataPermalinks = []struct {
 	{"/:sections[0]/:sections[last]/", true, "/a/c/"},               // Sections
 	{"/\\:filename", true, "/:filename"},                            // Escape sequence
 	{"/special\\::slug/", true, "/special:the-slug/"},               // Escape sequence
+	{"/:contentbasename/", true, "/index/"},                         // Content base name
+	{"/:contentbasenameorslug/", true, "/index/"},                   // Content base name or slug
 
 	// Failures
 	{"/blog/:fred", false, ""},