Add path, kind and lang to content front matter

Note that none of these can be set via cascade (you will get an error)

Fixes #11544

22 files changed, 707 insertions, 429 deletions

diff --git a/go.mod b/go.mod
index e8beedbfb..c74972d0b 100644
--- a/go.mod
+++ b/go.mod
@@ -48,7 +48,7 @@ require (
 	github.com/marekm4/color-extractor v1.2.1
 	github.com/mattn/go-isatty v0.0.20
 	github.com/mitchellh/hashstructure v1.1.0
-	github.com/mitchellh/mapstructure v1.5.0
+	github.com/mitchellh/mapstructure v1.5.1-0.20231216201459-8508981c8b6c
 	github.com/muesli/smartcrop v0.3.0
 	github.com/niklasfasching/go-org v1.7.0
 	github.com/olekukonko/tablewriter v0.0.5
diff --git a/go.sum b/go.sum
index 3c1cfe7ff..4795d0d68 100644
--- a/go.sum
+++ b/go.sum
@@ -359,6 +359,8 @@ github.com/mitchellh/hashstructure v1.1.0 h1:P6P1hdjqAAknpY/M1CGipelZgp+4y9ja9km
 github.com/mitchellh/hashstructure v1.1.0/go.mod h1:xUDAozZz0Wmdiufv0uyhnHkUTN6/6d8ulp4AwfLKrmA=
 github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
 github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
+github.com/mitchellh/mapstructure v1.5.1-0.20231216201459-8508981c8b6c h1:cqn374mizHuIWj+OSJCajGr/phAmuMug9qIX3l9CflE=
+github.com/mitchellh/mapstructure v1.5.1-0.20231216201459-8508981c8b6c/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
 github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826 h1:RWengNIwukTxcDr9M+97sNutRR1RKhG96O6jWumTTnw=
 github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826/go.mod h1:TaXosZuwdSHYgviHp1DAtfrULt5eUgsSMsZf+YrPgl8=
 github.com/montanaflynn/stats v0.6.3/go.mod h1:wL8QJuTMNUDYhXwkmfOly8iTdp5TEcJFWZD2D7SIkUc=
diff --git a/hugolib/content_map.go b/hugolib/content_map.go
index fefa90bf1..96013c4ed 100644
--- a/hugolib/content_map.go
+++ b/hugolib/content_map.go
@@ -187,7 +187,7 @@ func (m *pageMap) AddFi(fi hugofs.FileMetaInfo) error {
 		if pi.IsContent() {
 			// Create the page now as we need it at assemembly time.
 			// The other resources are created if needed.
-			pageResource, err := m.s.h.newPage(
+			pageResource, pi, err := m.s.h.newPage(
 				&pageMeta{
 					f:        source.NewFileInfo(fim),
 					pathInfo: pi,
@@ -197,6 +197,8 @@ func (m *pageMap) AddFi(fi hugofs.FileMetaInfo) error {
 			if err != nil {
 				return err
 			}
+			key = pi.Base()
+
 			rs = &resourceSource{r: pageResource}
 		} else {
 			rs = &resourceSource{path: pi, opener: r, fi: fim}
@@ -226,7 +228,7 @@ func (m *pageMap) AddFi(fi hugofs.FileMetaInfo) error {
 			},
 		))
 		// A content file.
-		p, err := m.s.h.newPage(
+		p, pi, err := m.s.h.newPage(
 			&pageMeta{
 				f:        source.NewFileInfo(fi),
 				pathInfo: pi,
diff --git a/hugolib/content_map_page.go b/hugolib/content_map_page.go
index 536f23ccd..9fee74003 100644
--- a/hugolib/content_map_page.go
+++ b/hugolib/content_map_page.go
@@ -43,6 +43,7 @@ import (
 
 	"github.com/gohugoio/hugo/resources/kinds"
 	"github.com/gohugoio/hugo/resources/page"
+	"github.com/gohugoio/hugo/resources/page/pagemeta"
 	"github.com/gohugoio/hugo/resources/resource"
 )
 
@@ -97,7 +98,6 @@ type pageMap struct {
 	cacheContentRendered   *dynacache.Partition[string, *resources.StaleValue[contentSummary]]
 	cacheContentPlain      *dynacache.Partition[string, *resources.StaleValue[contentPlainPlainWords]]
 	contentTableOfContents *dynacache.Partition[string, *resources.StaleValue[contentTableOfContents]]
-	cacheContentSource     *dynacache.Partition[string, *resources.StaleValue[[]byte]]
 
 	cfg contentMapConfig
 }
@@ -147,7 +147,6 @@ func (t *pageTrees) collectIdentities(key string) []identity.Identity {
 
 // collectIdentitiesSurrounding collects all identities surrounding the given key.
 func (t *pageTrees) collectIdentitiesSurrounding(key string, maxSamplesPerTree int) []identity.Identity {
-	// TODO1 test language coverage from this.
 	ids := t.collectIdentitiesSurroundingIn(key, maxSamplesPerTree, t.treePages)
 	ids = append(ids, t.collectIdentitiesSurroundingIn(key, maxSamplesPerTree, t.treeResources)...)
 	return ids
@@ -483,7 +482,7 @@ func (m *pageMap) getOrCreateResourcesForPage(ps *pageState) resource.Resources
 			return nil, err
 		}
 
-		if translationKey := ps.m.translationKey; translationKey != "" {
+		if translationKey := ps.m.pageConfig.TranslationKey; translationKey != "" {
 			// This this should not be a very common case.
 			// Merge in resources from the other languages.
 			translatedPages, _ := m.s.h.translationKeyPages.Get(translationKey)
@@ -539,9 +538,9 @@ func (m *pageMap) getOrCreateResourcesForPage(ps *pageState) resource.Resources
 
 		sort.SliceStable(res, lessFunc)
 
-		if len(ps.m.resourcesMetadata) > 0 {
+		if len(ps.m.pageConfig.Resources) > 0 {
 			for i, r := range res {
-				res[i] = resources.CloneWithMetadataIfNeeded(ps.m.resourcesMetadata, r)
+				res[i] = resources.CloneWithMetadataIfNeeded(ps.m.pageConfig.Resources, r)
 			}
 			sort.SliceStable(res, lessFunc)
 		}
@@ -819,7 +818,6 @@ func newPageMap(i int, s *Site, mcache *dynacache.Cache, pageTrees *pageTrees) *
 		cacheContentRendered:   dynacache.GetOrCreatePartition[string, *resources.StaleValue[contentSummary]](mcache, fmt.Sprintf("/cont/ren/%d", i), dynacache.OptionsPartition{Weight: 70, ClearWhen: dynacache.ClearOnChange}),
 		cacheContentPlain:      dynacache.GetOrCreatePartition[string, *resources.StaleValue[contentPlainPlainWords]](mcache, fmt.Sprintf("/cont/pla/%d", i), dynacache.OptionsPartition{Weight: 70, ClearWhen: dynacache.ClearOnChange}),
 		contentTableOfContents: dynacache.GetOrCreatePartition[string, *resources.StaleValue[contentTableOfContents]](mcache, fmt.Sprintf("/cont/toc/%d", i), dynacache.OptionsPartition{Weight: 70, ClearWhen: dynacache.ClearOnChange}),
-		cacheContentSource:     dynacache.GetOrCreatePartition[string, *resources.StaleValue[[]byte]](mcache, fmt.Sprintf("/cont/src/%d", i), dynacache.OptionsPartition{Weight: 70, ClearWhen: dynacache.ClearOnChange}),
 
 		cfg: contentMapConfig{
 			lang:                 s.Lang(),
@@ -1215,7 +1213,7 @@ func (sa *sitePagesAssembler) applyAggregates() error {
 			// Home page gets it's cascade from the site config.
 			cascade = sa.conf.Cascade.Config
 
-			if pageBundle.m.cascade == nil {
+			if pageBundle.m.pageConfig.Cascade == nil {
 				// Pass the site cascade downwards.
 				pw.WalkContext.Data().Insert(keyPage, cascade)
 			}
@@ -1227,12 +1225,12 @@ func (sa *sitePagesAssembler) applyAggregates() error {
 		}
 
 		if (pageBundle.IsHome() || pageBundle.IsSection()) && pageBundle.m.setMetaPostCount > 0 {
-			oldDates := pageBundle.m.dates
+			oldDates := pageBundle.m.pageConfig.Dates
 
 			// We need to wait until after the walk to determine if any of the dates have changed.
 			pw.WalkContext.AddPostHook(
 				func() error {
-					if oldDates != pageBundle.m.dates {
+					if oldDates != pageBundle.m.pageConfig.Dates {
 						sa.assembleChanges.Add(pageBundle)
 					}
 					return nil
@@ -1251,11 +1249,12 @@ func (sa *sitePagesAssembler) applyAggregates() error {
 
 		const eventName = "dates"
 		if n.isContentNodeBranch() {
-			if pageBundle.m.cascade != nil {
+			if pageBundle.m.pageConfig.Cascade != nil {
 				// Pass it down.
-				pw.WalkContext.Data().Insert(keyPage, pageBundle.m.cascade)
+				pw.WalkContext.Data().Insert(keyPage, pageBundle.m.pageConfig.Cascade)
 			}
-			wasZeroDates := resource.IsZeroDates(pageBundle.m.dates)
+
+			wasZeroDates := pageBundle.m.pageConfig.Dates.IsAllDatesZero()
 			if wasZeroDates || pageBundle.IsHome() {
 				pw.WalkContext.AddEventListener(eventName, keyPage, func(e *doctree.Event[contentNodeI]) {
 					sp, ok := e.Source.(*pageState)
@@ -1264,15 +1263,15 @@ func (sa *sitePagesAssembler) applyAggregates() error {
 					}
 
 					if wasZeroDates {
-						pageBundle.m.dates.UpdateDateAndLastmodIfAfter(sp.m.dates)
+						pageBundle.m.pageConfig.Dates.UpdateDateAndLastmodIfAfter(sp.m.pageConfig.Dates)
 					}
 
 					if pageBundle.IsHome() {
-						if pageBundle.m.dates.Lastmod().After(pageBundle.s.lastmod) {
-							pageBundle.s.lastmod = pageBundle.m.dates.Lastmod()
+						if pageBundle.m.pageConfig.Dates.Lastmod.After(pageBundle.s.lastmod) {
+							pageBundle.s.lastmod = pageBundle.m.pageConfig.Dates.Lastmod
 						}
-						if sp.m.dates.Lastmod().After(pageBundle.s.lastmod) {
-							pageBundle.s.lastmod = sp.m.dates.Lastmod()
+						if sp.m.pageConfig.Dates.Lastmod.After(pageBundle.s.lastmod) {
+							pageBundle.s.lastmod = sp.m.pageConfig.Dates.Lastmod
 						}
 					}
 				})
@@ -1351,9 +1350,9 @@ func (sa *sitePagesAssembler) applyAggregatesToTaxonomiesAndTerms() error {
 				p := n.(*pageState)
 				if p.Kind() != kinds.KindTerm {
 					// The other kinds were handled in applyAggregates.
-					if p.m.cascade != nil {
+					if p.m.pageConfig.Cascade != nil {
 						// Pass it down.
-						pw.WalkContext.Data().Insert(s, p.m.cascade)
+						pw.WalkContext.Data().Insert(s, p.m.pageConfig.Cascade)
 					}
 				}
 
@@ -1388,14 +1387,14 @@ func (sa *sitePagesAssembler) applyAggregatesToTaxonomiesAndTerms() error {
 				// Send the date info up the tree.
 				pw.WalkContext.SendEvent(&doctree.Event[contentNodeI]{Source: n, Path: s, Name: eventName})
 
-				if resource.IsZeroDates(p.m.dates) {
+				if p.m.pageConfig.Dates.IsAllDatesZero() {
 					pw.WalkContext.AddEventListener(eventName, s, func(e *doctree.Event[contentNodeI]) {
 						sp, ok := e.Source.(*pageState)
 						if !ok {
 							return
 						}
 
-						p.m.dates.UpdateDateAndLastmodIfAfter(sp.m.dates)
+						p.m.pageConfig.Dates.UpdateDateAndLastmodIfAfter(sp.m.pageConfig.Dates)
 					})
 				}
 
@@ -1443,8 +1442,8 @@ func (sa *sitePagesAssembler) assembleTermsAndTranslations() error {
 			// This is a little out of place, but is conveniently put here.
 			// Check if translationKey is set by user.
 			// This is to support the manual way of setting the translationKey in front matter.
-			if ps.m.translationKey != "" {
-				sa.s.h.translationKeyPages.Append(ps.m.translationKey, ps)
+			if ps.m.pageConfig.TranslationKey != "" {
+				sa.s.h.translationKeyPages.Append(ps.m.pageConfig.TranslationKey, ps)
 			}
 
 			if sa.pageMap.cfg.taxonomyTermDisabled {
@@ -1477,9 +1476,13 @@ func (sa *sitePagesAssembler) assembleTermsAndTranslations() error {
 							singular: viewName.singular,
 							s:        sa.Site,
 							pathInfo: pi,
-							kind:     kinds.KindTerm,
+							pageMetaParams: pageMetaParams{
+								pageConfig: &pagemeta.PageConfig{
+									Kind: kinds.KindTerm,
+								},
+							},
 						}
-						n, err := sa.h.newPage(m)
+						n, pi, err := sa.h.newPage(m)
 						if err != nil {
 							return false, err
 						}
@@ -1524,7 +1527,7 @@ func (sa *sitePagesAssembler) assembleResources() error {
 			targetPaths := ps.targetPaths()
 			baseTarget := targetPaths.SubResourceBaseTarget
 			duplicateResourceFiles := true
-			if ps.s.ContentSpec.Converters.IsGoldmark(ps.m.markup) {
+			if ps.s.ContentSpec.Converters.IsGoldmark(ps.m.pageConfig.Markup) {
 				duplicateResourceFiles = ps.s.ContentSpec.Converters.GetMarkupConfig().Goldmark.DuplicateResourceFiles
 			}
 
@@ -1566,7 +1569,7 @@ func (sa *sitePagesAssembler) assembleResources() error {
 						BasePathTargetPath:   baseTarget,
 						Name:                 relPath,
 						NameOriginal:         relPathOriginal,
-						LazyPublish:          !ps.m.buildConfig.PublishResources,
+						LazyPublish:          !ps.m.pageConfig.Build.PublishResources,
 					}
 					r, err := ps.m.s.ResourceSpec.NewResource(rd)
 					if err != nil {
@@ -1631,7 +1634,7 @@ func (sa *sitePagesAssembler) removeShouldNotBuild() error {
 				case kinds.KindHome, kinds.KindSection, kinds.KindTaxonomy:
 					// We need to keep these for the structure, but disable
 					// them so they don't get listed/rendered.
-					(&p.m.buildConfig).Disable()
+					(&p.m.pageConfig.Build).Disable()
 				default:
 					keys = append(keys, key)
 				}
@@ -1673,13 +1676,17 @@ func (sa *sitePagesAssembler) addStandalonePages() error {
 		}
 
 		m := &pageMeta{
-			s:                      s,
-			pathInfo:               s.Conf.PathParser().Parse(files.ComponentFolderContent, key+f.MediaType.FirstSuffix.FullSuffix),
-			kind:                   kind,
+			s:        s,
+			pathInfo: s.Conf.PathParser().Parse(files.ComponentFolderContent, key+f.MediaType.FirstSuffix.FullSuffix),
+			pageMetaParams: pageMetaParams{
+				pageConfig: &pagemeta.PageConfig{
+					Kind: kind,
+				},
+			},
 			standaloneOutputFormat: f,
 		}
 
-		p, _ := s.h.newPage(m)
+		p, _, _ := s.h.newPage(m)
 
 		tree.InsertIntoValuesDimension(key, p)
 	}
@@ -1756,7 +1763,7 @@ func (sa *sitePagesAssembler) addMissingRootSections() error {
 					pathInfo: pth,
 				}
 
-				ps, err := sa.h.newPage(m)
+				ps, pth, err := sa.h.newPage(m)
 				if err != nil {
 					return false, err
 				}
@@ -1781,9 +1788,13 @@ func (sa *sitePagesAssembler) addMissingRootSections() error {
 		m := &pageMeta{
 			s:        sa.Site,
 			pathInfo: p,
-			kind:     kinds.KindHome,
+			pageMetaParams: pageMetaParams{
+				pageConfig: &pagemeta.PageConfig{
+					Kind: kinds.KindHome,
+				},
+			},
 		}
-		n, err := sa.h.newPage(m)
+		n, p, err := sa.h.newPage(m)
 		if err != nil {
 			return err
 		}
@@ -1810,10 +1821,14 @@ func (sa *sitePagesAssembler) addMissingTaxonomies() error {
 			m := &pageMeta{
 				s:        sa.Site,
 				pathInfo: sa.Conf.PathParser().Parse(files.ComponentFolderContent, key+"/_index.md"),
-				kind:     kinds.KindTaxonomy,
+				pageMetaParams: pageMetaParams{
+					pageConfig: &pagemeta.PageConfig{
+						Kind: kinds.KindTaxonomy,
+					},
+				},
 				singular: viewName.singular,
 			}
-			p, _ := sa.h.newPage(m)
+			p, _, _ := sa.h.newPage(m)
 			tree.InsertIntoValuesDimension(key, p)
 		}
 	}
diff --git a/hugolib/hugo_sites.go b/hugolib/hugo_sites.go
index 80e754453..1b2840617 100644
--- a/hugolib/hugo_sites.go
+++ b/hugolib/hugo_sites.go
@@ -26,6 +26,7 @@ import (
 	"github.com/gohugoio/hugo/config/allconfig"
 	"github.com/gohugoio/hugo/hugofs/glob"
 	"github.com/gohugoio/hugo/hugolib/doctree"
+	"github.com/gohugoio/hugo/resources"
 
 	"github.com/fsnotify/fsnotify"
 
@@ -72,6 +73,8 @@ type HugoSites struct {
 
 	// Cache for page listings.
 	cachePages *dynacache.Partition[string, page.Pages]
+	// Cache for content sources.
+	cacheContentSource *dynacache.Partition[string, *resources.StaleValue[[]byte]]
 
 	// Before Hugo 0.122.0 we managed all translations in a map using a translationKey
 	// that could be overridden in front matter.
diff --git a/hugolib/integrationtest_builder.go b/hugolib/integrationtest_builder.go
index 3fec04df0..a46ae7275 100644
--- a/hugolib/integrationtest_builder.go
+++ b/hugolib/integrationtest_builder.go
@@ -80,6 +80,15 @@ func Test(t testing.TB, files string, opts ...TestOpt) *IntegrationTestBuilder {
 	return NewIntegrationTestBuilder(cfg).Build()
 }
 
+// TestE is the same as Test, but returns an error instead of failing the test.
+func TestE(t testing.TB, files string, opts ...TestOpt) (*IntegrationTestBuilder, error) {
+	cfg := IntegrationTestConfig{T: t, TxtarString: files}
+	for _, o := range opts {
+		o(&cfg)
+	}
+	return NewIntegrationTestBuilder(cfg).BuildE()
+}
+
 // TestRunning is a convenience method to create a new IntegrationTestBuilder from some files with Running set to true and run a build.
 // Deprecated: Use Test with TestOptRunning instead.
 func TestRunning(t testing.TB, files string, opts ...TestOpt) *IntegrationTestBuilder {
diff --git a/hugolib/page.go b/hugolib/page.go
index f8ec5e225..822b7c021 100644
--- a/hugolib/page.go
+++ b/hugolib/page.go
@@ -1,4 +1,4 @@
-// Copyright 2019 The Hugo Authors. All rights reserved.
+// Copyright 2024 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -27,6 +27,7 @@ import (
 	"github.com/gohugoio/hugo/output"
 	"github.com/gohugoio/hugo/output/layouts"
 	"github.com/gohugoio/hugo/related"
+	"github.com/spf13/afero"
 
 	"github.com/gohugoio/hugo/markup/converter"
 	"github.com/gohugoio/hugo/markup/tableofcontents"
@@ -197,7 +198,7 @@ func (p *pageHeadingsFiltered) page() page.Page {
 
 // For internal use by the related content feature.
 func (p *pageState) ApplyFilterToHeadings(ctx context.Context, fn func(*tableofcontents.Heading) bool) related.Document {
-	r, err := p.content.contentToC(ctx, p.pageOutput.pco)
+	r, err := p.m.content.contentToC(ctx, p.pageOutput.pco)
 	if err != nil {
 		panic(err)
 	}
@@ -313,14 +314,14 @@ func (p *pageState) Pages() page.Pages {
 // RawContent returns the un-rendered source content without
 // any leading front matter.
 func (p *pageState) RawContent() string {
-	if p.content.parseInfo.itemsStep2 == nil {
+	if p.m.content.pi.itemsStep2 == nil {
 		return ""
 	}
-	start := p.content.parseInfo.posMainContent
+	start := p.m.content.pi.posMainContent
 	if start == -1 {
 		start = 0
 	}
-	source, err := p.content.contentSource()
+	source, err := p.m.content.pi.contentSource(p.m.content)
 	if err != nil {
 		panic(err)
 	}
@@ -332,11 +333,11 @@ func (p *pageState) Resources() resource.Resources {
 }
 
 func (p *pageState) HasShortcode(name string) bool {
-	if p.content.shortcodeState == nil {
+	if p.m.content.shortcodeState == nil {
 		return false
 	}
 
-	return p.content.shortcodeState.hasName(name)
+	return p.m.content.shortcodeState.hasName(name)
 }
 
 func (p *pageState) Site() page.Site {
@@ -355,8 +356,8 @@ func (p *pageState) IsTranslated() bool {
 
 // TranslationKey returns the key used to identify a translation of this content.
 func (p *pageState) TranslationKey() string {
-	if p.m.translationKey != "" {
-		return p.m.translationKey
+	if p.m.pageConfig.TranslationKey != "" {
+		return p.m.pageConfig.TranslationKey
 	}
 	return p.Path()
 }
@@ -365,9 +366,9 @@ func (p *pageState) TranslationKey() string {
 func (p *pageState) AllTranslations() page.Pages {
 	key := p.Path() + "/" + "translations-all"
 	pages, err := p.s.pageMap.getOrCreatePagesFromCache(key, func(string) (page.Pages, error) {
-		if p.m.translationKey != "" {
+		if p.m.pageConfig.TranslationKey != "" {
 			// translationKey set by user.
-			pas, _ := p.s.h.translationKeyPages.Get(p.m.translationKey)
+			pas, _ := p.s.h.translationKeyPages.Get(p.m.pageConfig.TranslationKey)
 			pasc := make(page.Pages, len(pas))
 			copy(pasc, pas)
 			page.SortByLanguage(pasc)
@@ -534,7 +535,7 @@ var defaultRenderStringOpts = renderStringOpts{
 	Markup:  "", // Will inherit the page's value when not set.
 }
 
-func (p *pageMeta) wrapError(err error) error {
+func (p *pageMeta) wrapError(err error, sourceFs afero.Fs) error {
 	if err == nil {
 		panic("wrapError with nil")
 	}
@@ -544,18 +545,18 @@ func (p *pageMeta) wrapError(err error) error {
 		return fmt.Errorf("%q: %w", p.Path(), err)
 	}
 
-	return hugofs.AddFileInfoToError(err, p.File().FileInfo(), p.s.SourceSpec.Fs.Source)
+	return hugofs.AddFileInfoToError(err, p.File().FileInfo(), sourceFs)
 }
 
 // wrapError adds some more context to the given error if possible/needed
 func (p *pageState) wrapError(err error) error {
-	return p.m.wrapError(err)
+	return p.m.wrapError(err, p.s.h.SourceFs)
 }
 
 func (p *pageState) getContentConverter() converter.Converter {
 	var err error
 	p.contentConverterInit.Do(func() {
-		markup := p.m.markup
+		markup := p.m.pageConfig.Markup
 		if markup == "html" {
 			// Only used for shortcode inner content.
 			markup = "markdown"
@@ -612,7 +613,7 @@ func (p *pageState) posFromInput(input []byte, offset int) text.Position {
 }
 
 func (p *pageState) posOffset(offset int) text.Position {
-	return p.posFromInput(p.content.mustSource(), offset)
+	return p.posFromInput(p.m.content.mustSource(), offset)
 }
 
 // shiftToOutputFormat is serialized. The output format idx refers to the
diff --git a/hugolib/page__common.go b/hugolib/page__common.go
index 0881affe7..164776842 100644
--- a/hugolib/page__common.go
+++ b/hugolib/page__common.go
@@ -91,9 +91,6 @@ type pageCommon struct {
 	layoutDescriptor     layouts.LayoutDescriptor
 	layoutDescriptorInit sync.Once
 
-	// The source and the parsed page content.
-	content *cachedContent
-
 	// Set if feature enabled and this is in a Git repo.
 	gitInfo    source.GitInfo
 	codeowners []string
diff --git a/hugolib/page__content.go b/hugolib/page__content.go
index 64ce83f0e..62e78c612 100644
--- a/hugolib/page__content.go
+++ b/hugolib/page__content.go
@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"html/template"
 	"io"
+	"strconv"
 	"strings"
 	"unicode/utf8"
 
@@ -53,9 +54,8 @@ type pageContentReplacement struct {
 	source pageparser.Item
 }
 
-func newCachedContent(m *pageMeta, pid uint64) (*cachedContent, error) {
+func (m *pageMeta) parseFrontMatter(h *HugoSites, pid uint64, sourceKey string) (*contentParseInfo, error) {
 	var openSource hugio.OpenReadSeekCloser
-	var filename string
 	if m.f != nil {
 		meta := m.f.FileInfo().Meta()
 		openSource = func() (hugio.ReadSeekCloser, error) {
@@ -65,6 +65,44 @@ func newCachedContent(m *pageMeta, pid uint64) (*cachedContent, error) {
 			}
 			return r, nil
 		}
+	}
+
+	if sourceKey == "" {
+		sourceKey = strconv.Itoa(int(pid))
+	}
+
+	pi := &contentParseInfo{
+		h:          h,
+		pid:        pid,
+		sourceKey:  sourceKey,
+		openSource: openSource,
+	}
+
+	source, err := pi.contentSource(m)
+	if err != nil {
+		return nil, err
+	}
+
+	items, err := pageparser.ParseBytes(
+		source,
+		pageparser.Config{},
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	pi.itemsStep1 = items
+
+	if err := pi.mapFrontMatter(source); err != nil {
+		return nil, err
+	}
+
+	return pi, nil
+}
+
+func (m *pageMeta) newCachedContent(h *HugoSites, pi *contentParseInfo) (*cachedContent, error) {
+	var filename string
+	if m.f != nil {
 		filename = m.f.Filename()
 	}
 
@@ -72,15 +110,11 @@ func newCachedContent(m *pageMeta, pid uint64) (*cachedContent, error) {
 		pm:             m.s.pageMap,
 		StaleInfo:      m,
 		shortcodeState: newShortcodeHandler(filename, m.s),
-		parseInfo: &contentParseInfo{
-			pid: pid,
-		},
-		cacheBaseKey: m.pathInfo.PathNoLang(),
-		openSource:   openSource,
-		enableEmoji:  m.s.conf.EnableEmoji,
+		pi:             pi,
+		enableEmoji:    m.s.conf.EnableEmoji,
 	}
 
-	source, err := c.contentSource()
+	source, err := c.pi.contentSource(m)
 	if err != nil {
 		return nil, err
 	}
@@ -95,23 +129,25 @@ func newCachedContent(m *pageMeta, pid uint64) (*cachedContent, error) {
 type cachedContent struct {
 	pm *pageMap
 
-	cacheBaseKey string
-
-	// The source bytes.
-	openSource hugio.OpenReadSeekCloser
-
 	resource.StaleInfo
 
 	shortcodeState *shortcodeHandler
 
 	// Parsed content.
-	parseInfo *contentParseInfo
+	pi *contentParseInfo
 
 	enableEmoji bool
 }
 
 type contentParseInfo struct {
-	pid         uint64
+	h *HugoSites
+
+	pid       uint64
+	sourceKey string
+
+	// The source bytes.
+	openSource hugio.OpenReadSeekCloser
+
 	frontMatter map[string]any
 
 	// Whether the parsed content contains a summary separator.
@@ -190,25 +226,15 @@ func (pi *contentParseInfo) contentToRender(ctx context.Context, source []byte,
 }
 
 func (c *cachedContent) IsZero() bool {
-	return len(c.parseInfo.itemsStep2) == 0
+	return len(c.pi.itemsStep2) == 0
 }
 
 func (c *cachedContent) parseContentFile(source []byte) error {
-	if source == nil || c.openSource == nil {
+	if source == nil || c.pi.openSource == nil {
 		return nil
 	}
 
-	items, err := pageparser.ParseBytes(
-		source,
-		pageparser.Config{},
-	)
-	if err != nil {
-		return err
-	}
-
-	c.parseInfo.itemsStep1 = items
-
-	return c.parseInfo.mapItems(source, c.shortcodeState)
+	return c.pi.mapItemsAfterFrontMatter(source, c.shortcodeState)
 }
 
 func (c *contentParseInfo) parseFrontMatter(it pageparser.Item, iter *pageparser.Iterator, source []byte) error {
@@ -242,7 +268,49 @@ func (c *contentParseInfo) parseFrontMatter(it pageparser.Item, iter *pageparser
 	return nil
 }
 
-func (rn *contentParseInfo) mapItems(
+func (rn *contentParseInfo) failMap(source []byte, err error, i pageparser.Item) error {
+	if fe, ok := err.(herrors.FileError); ok {
+		return fe
+	}
+
+	pos := posFromInput("", source, i.Pos())
+
+	return herrors.NewFileErrorFromPos(err, pos)
+}
+
+func (rn *contentParseInfo) mapFrontMatter(source []byte) error {
+	if len(rn.itemsStep1) == 0 {
+		return nil
+	}
+	iter := pageparser.NewIterator(rn.itemsStep1)
+
+Loop:
+	for {
+		it := iter.Next()
+		switch {
+		case it.IsFrontMatter():
+			if err := rn.parseFrontMatter(it, iter, source); err != nil {
+				return err
+			}
+			next := iter.Peek()
+			if !next.IsDone() {
+				rn.posMainContent = next.Pos()
+			}