Detect now invalid path patterns in cascade

Closes #11977

hugolib/cascade_test.go

@@ -671,3 +671,32 @@ S1|p1:|p2:p2|
 		`)
 	})
 }
+
+// Issue 11977.
+func TestCascadeExtensionInPath(t *testing.T) {
+	files := `
+-- hugo.toml --
+baseURL = "https://example.org"
+[languages]
+[languages.en]
+weight = 1
+[languages.de]
+-- content/_index.de.md --
++++
+[[cascade]]
+[cascade.params]
+foo = 'bar'
+[cascade._target]
+path = '/posts/post-1.de.md'
++++
+-- content/posts/post-1.de.md --
+---
+title: "Post 1"
+---
+-- layouts/_default/single.html --
+{{ .Title }}|{{ .Params.foo }}$
+`
+	b, err := TestE(t, files)
+	b.Assert(err, qt.IsNotNil)
+	b.AssertLogContains(`cascade target path "/posts/post-1.de.md" looks like a path with an extension; since Hugo v0.123.0 this will not match anything, see  https://gohugo.io/methods/page/path/`)
+}

hugolib/page__meta.go

@@ -33,6 +33,7 @@ import (
 
 	"github.com/gohugoio/hugo/common/constants"
 	"github.com/gohugoio/hugo/common/hugo"
+	"github.com/gohugoio/hugo/common/loggers"
 	"github.com/gohugoio/hugo/common/maps"
 	"github.com/gohugoio/hugo/common/paths"
 	"github.com/gohugoio/hugo/config"
@@ -272,7 +273,7 @@ func (p *pageMeta) Weight() int {
 	return p.pageConfig.Weight
 }
 
-func (p *pageMeta) setMetaPre(pi *contentParseInfo, conf config.AllProvider) error {
+func (p *pageMeta) setMetaPre(pi *contentParseInfo, logger loggers.Logger, conf config.AllProvider) error {
 	frontmatter := pi.frontMatter
 	if frontmatter != nil {
 		pcfg := p.pageConfig
@@ -285,7 +286,7 @@ func (p *pageMeta) setMetaPre(pi *contentParseInfo, conf config.AllProvider) err
 		// Check for any cascade define on itself.
 		if cv, found := frontmatter["cascade"]; found {
 			var err error
-			cascade, err := page.DecodeCascade(cv)
+			cascade, err := page.DecodeCascade(logger, cv)
 			if err != nil {
 				return err
 			}
@@ -437,7 +438,6 @@ func (p *pageState) setMetaPostParams() error {
 	}
 	pm.pageConfig.Build, err = pagemeta.DecodeBuildConfig(buildConfig)
 	if err != nil {
-		//lint:ignore ST1005 end user message.
 		var msgDetail string
 		if isNewBuildKeyword {
 			msgDetail = `. We renamed the _build keyword to build in Hugo 0.123.0. We recommend putting user defined params in the params section, e.g.:

hugolib/page__new.go

@@ -56,7 +56,7 @@ func (h *HugoSites) newPage(m *pageMeta) (*pageState, *paths.Path, error) {
 		return nil, nil, err
 	}
 
-	if err := m.setMetaPre(pi, h.Conf); err != nil {
+	if err := m.setMetaPre(pi, h.Log, h.Conf); err != nil {
 		return nil, nil, m.wrapError(err, h.BaseFs.SourceFs)
 	}
 	pcfg := m.pageConfig