Add Page.RenderShortcodes

A layouts/shortcodes/include.html shortcode may look like this:

```html
{{ $p := site.GetPage (.Get 0) }}
{{ $p.RenderShortcodes }}
```

Fixes #7297

3 files changed, 80 insertions, 66 deletions

diff --git a/resources/page/page.go b/resources/page/page.go
index b1c867195..54fc71f33 100644
--- a/resources/page/page.go
+++ b/resources/page/page.go
@@ -277,6 +277,7 @@ type PageRenderProvider interface {
 // PageWithoutContent is the Page without any of the content methods.
 type PageWithoutContent interface {
 	RawContentProvider
+	RenderShortcodesProvider
 	resource.Resource
 	PageMetaProvider
 	resource.LanguageProvider
@@ -362,6 +363,11 @@ type RawContentProvider interface {
 	RawContent() string
 }
 
+type RenderShortcodesProvider interface {
+	// RenderShortcodes returns RawContent with any shortcodes rendered.
+	RenderShortcodes(context.Context) (template.HTML, error)
+}
+
 // RefProvider provides the methods needed to create reflinks to pages.
 type RefProvider interface {
 	// Ref returns an absolute URl to a page.
diff --git a/resources/page/page_nop.go b/resources/page/page_nop.go
index 59765ebf2..735d6eea8 100644
--- a/resources/page/page_nop.go
+++ b/resources/page/page_nop.go
@@ -401,6 +401,10 @@ func (p *nopPage) RawContent() string {
 	return ""
 }
 
+func (p *nopPage) RenderShortcodes(ctx context.Context) (template.HTML, error) {
+	return "", nil
+}
+
 func (p *nopPage) ReadingTime(context.Context) int {
 	return 0
 }
diff --git a/resources/page/testhelpers_test.go b/resources/page/testhelpers_test.go
index 50f297cab..ca2c4ff53 100644
--- a/resources/page/testhelpers_test.go
+++ b/resources/page/testhelpers_test.go
@@ -118,15 +118,15 @@ func (p *testPage) Err() resource.ResourceError {
 }
 
 func (p *testPage) Aliases() []string {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) AllTranslations() Pages {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) AlternativeOutputFormats() OutputFormats {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Author() Author {
@@ -138,19 +138,19 @@ func (p *testPage) Authors() AuthorList {
 }
 
 func (p *testPage) BaseFileName() string {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) BundleType() files.ContentClass {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Content(context.Context) (any, error) {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) ContentBaseName() string {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) CurrentSection() Page {
@@ -178,11 +178,11 @@ func (p *testPage) Description() string {
 }
 
 func (p *testPage) Dir() string {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Draft() bool {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Eq(other any) bool {
@@ -194,11 +194,11 @@ func (p *testPage) ExpiryDate() time.Time {
 }
 
 func (p *testPage) Ext() string {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Extension() string {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) File() source.File {
@@ -206,15 +206,15 @@ func (p *testPage) File() source.File {
 }
 
 func (p *testPage) FileInfo() hugofs.FileMetaInfo {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Filename() string {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) FirstSection() Page {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) FuzzyWordCount(context.Context) int {
@@ -222,19 +222,19 @@ func (p *testPage) FuzzyWordCount(context.Context) int {
 }
 
 func (p *testPage) GetPage(ref string) (Page, error) {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) GetPageWithTemplateInfo(info tpl.Info, ref string) (Page, error) {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) GetParam(key string) any {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) GetTerms(taxonomy string) Pages {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) GetRelatedDocsHandler() *RelatedDocsHandler {
@@ -250,27 +250,27 @@ func (p *testPage) CodeOwners() []string {
 }
 
 func (p *testPage) HasMenuCurrent(menuID string, me *navigation.MenuEntry) bool {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) HasShortcode(name string) bool {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Hugo() hugo.HugoInfo {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) InSection(other any) (bool, error) {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) IsAncestor(other any) (bool, error) {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) IsDescendant(other any) (bool, error) {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) IsDraft() bool {
@@ -278,27 +278,27 @@ func (p *testPage) IsDraft() bool {
 }
 
 func (p *testPage) IsHome() bool {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) IsMenuCurrent(menuID string, inme *navigation.MenuEntry) bool {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) IsNode() bool {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) IsPage() bool {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) IsSection() bool {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) IsTranslated() bool {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Keywords() []string {
@@ -314,7 +314,7 @@ func (p *testPage) Lang() string {
 }
 
 func (p *testPage) Language() *langs.Language {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) LanguagePrefix() string {
@@ -348,11 +348,11 @@ func (p *testPage) LinkTitle() string {
 }
 
 func (p *testPage) LogicalName() string {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) MediaType() media.Type {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Menus() navigation.PageMenus {
@@ -360,11 +360,11 @@ func (p *testPage) Menus() navigation.PageMenus {
 }
 
 func (p *testPage) Name() string {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Next() Page {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) NextInSection() Page {
@@ -376,19 +376,19 @@ func (p *testPage) NextPage() Page {
 }
 
 func (p *testPage) OutputFormats() OutputFormats {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Pages() Pages {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) RegularPages() Pages {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) RegularPagesRecursive() Pages {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Paginate(seq any, options ...any) (*Pager, error) {
@@ -412,11 +412,11 @@ func (p *testPage) Page() Page {
 }
 
 func (p *testPage) Parent() Page {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Ancestors() Pages {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Path() string {
@@ -428,19 +428,19 @@ func (p *testPage) Pathc() string {
 }
 
 func (p *testPage) Permalink() string {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Plain(context.Context) string {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) PlainWords(context.Context) []string {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Prev() Page {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) PrevInSection() Page {
@@ -460,15 +460,19 @@ func (p *testPage) RSSLink() template.URL {
 }
 
 func (p *testPage) RawContent() string {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
+}
+
+func (p *testPage) RenderShortcodes(context.Context) (template.HTML, error) {
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) ReadingTime(context.Context) int {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Ref(argsm map[string]any) (string, error) {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) RefFrom(argsm map[string]any, source any) (string, error) {
@@ -476,11 +480,11 @@ func (p *testPage) RefFrom(argsm map[string]any, source any) (string, error) {
 }
 
 func (p *testPage) RelPermalink() string {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) RelRef(argsm map[string]any) (string, error) {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) RelRefFrom(argsm map[string]any, source any) (string, error) {
@@ -488,27 +492,27 @@ func (p *testPage) RelRefFrom(argsm map[string]any, source any) (string, error)
 }
 
 func (p *testPage) Render(ctx context.Context, layout ...string) (template.HTML, error) {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) RenderString(ctx context.Context, args ...any) (template.HTML, error) {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) ResourceType() string {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Resources() resource.Resources {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Scratch() *maps.Scratch {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Store() *maps.Scratch {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) RelatedKeywords(cfg related.IndexConfig) ([]related.Keyword, error) {
@@ -525,7 +529,7 @@ func (p *testPage) Section() string {
 }
 
 func (p *testPage) Sections() Pages {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) SectionsEntries() []string {
@@ -541,7 +545,7 @@ func (p *testPage) Site() Site {
 }
 
 func (p *testPage) Sites() Sites {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Slug() string {
@@ -553,11 +557,11 @@ func (p *testPage) String() string {
 }
 
 func (p *testPage) Summary(context.Context) template.HTML {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) TableOfContents(context.Context) template.HTML {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Title() string {
@@ -565,7 +569,7 @@ func (p *testPage) Title() string {
 }
 
 func (p *testPage) TranslationBaseName() string {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) TranslationKey() string {
@@ -573,11 +577,11 @@ func (p *testPage) TranslationKey() string {
 }
 
 func (p *testPage) Translations() Pages {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Truncated(context.Context) bool {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Type() string {
@@ -589,7 +593,7 @@ func (p *testPage) URL() string {
 }
 
 func (p *testPage) UniqueID() string {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) Weight() int {
@@ -597,11 +601,11 @@ func (p *testPage) Weight() int {
 }
 
 func (p *testPage) WordCount(context.Context) int {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func (p *testPage) GetIdentity() identity.Identity {
-	panic("tespage: not implemented")
+	panic("testpage: not implemented")
 }
 
 func createTestPages(num int) Pages {