Set cascade target to the content matrix if not set in the cascade itself

Fixes #14310

Co-authored-by: Joe Mooring <joe.mooring@veriphor.com>

Author: bep

hugolib/cascade_test.go

@@ -365,3 +365,48 @@ Resource: {{ .Name }}|p1: {{ .Params.p1 }}|
 
 	b.AssertFileContent("public/b1/index.html", "Title: b1|p1: v1|", "Resource: p2.md|p1: v1|")
 }
+
+// Issue 14310
+func TestCascadeIssue14310(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- hugo.toml --
+disableKinds = ['home','rss','sitemap','taxonomy','term']
+defaultContentLanguage = 'en'
+defaultContentLanguageInSubdir = true
+[languages.en]
+weight = 1
+[languages.de]
+weight = 2
+-- layouts/all.html --
+{{ .Params.color }}
+-- content/s1/_index.de.md --
+---
+title: s1 (de)
+cascade:
+  params:
+    color: red (de)
+---
+-- content/s1/_index.en.md --
+---
+title: s1 (en)
+cascade:
+  params:
+    color: red (en)
+---
+-- content/s1/p1.de.md --
+---
+title: p1 (de)
+---
+-- content/s1/p1.en.md --
+---
+title: p1 (en)
+---
+`
+
+	b := Test(t, files)
+
+	b.AssertFileContent("public/en/s1/p1/index.html", "red (en)")
+	b.AssertFileContent("public/de/s1/p1/index.html", "red (de)") // fails: file contains "red (en)"
+}

hugolib/hugo_smoke_test.go

@@ -544,7 +544,7 @@ Content Tag 1.
 
 	b.AssertFileContent("public/en/posts/p1/index.html",
 		"Single: en|page|/en/posts/p1/|Post 1|<p>Content 1.</p>\n|Len Resources: 2|",
-		"Resources: text|/en/posts/p1/f1.txt|text/plain|map[icon:enicon] - page||application/octet-stream|map[background:post.jpg draft:false iscjklanguage:false title:Post Sub 1] -",
+		"Resources: text|/en/posts/p1/f1.txt|text/plain|map[icon:enicon] - page||application/octet-stream|map[draft:false iscjklanguage:false title:Post Sub 1] -",
 		"Icon: enicon",
 		"Icon fingerprinted: enicon|/en/posts/p1/f1.e5746577af5cbfc4f34c558051b7955a9a5a795a84f1c6ab0609cb3473a924cb.txt|",
 		"NextInSection: |\nPrevInSection: /en/posts/p2/|Post 2|",

resources/page/page_matcher.go

@@ -246,17 +246,21 @@ func (d cascadeConfigDecoder) decodePageMatcher(m any, v *PageMatcher) error {
 }
 
 // DecodeCascadeConfigOptions
-func (v *PageMatcher) compileSitesMatrix(configuredDimensions *sitesmatrix.ConfiguredDimensions) error {
-	if v.Sites.Matrix.IsZero() {
+func (v *PageMatcher) compileSitesMatrix(defaults sitesmatrix.VectorStore, configuredDimensions *sitesmatrix.ConfiguredDimensions) error {
+	if v.Sites.Matrix.IsZero() && defaults == nil {
 		// Nothing to do.
 		v.SitesMatrixCompiled = nil
 		return nil
 	}
 	intSetsCfg := sitesmatrix.IntSetsConfig{
 		Globs: v.Sites.Matrix,
 	}
-	b := sitesmatrix.NewIntSetsBuilder(configuredDimensions).WithConfig(intSetsCfg).WithAllIfNotSet()
 
+	b := sitesmatrix.NewIntSetsBuilder(configuredDimensions).WithConfig(intSetsCfg)
+	if defaults != nil && v.Sites.Matrix.IsZero() {
+		b = b.WithDimensionsFromOtherIfNotSet(defaults)
+	}
+	b = b.WithAllIfNotSet()
 	v.SitesMatrixCompiled = b.Build()
 	return nil
 }
@@ -281,6 +285,17 @@ func (p *PageMatcherParamsConfig) init() error {
 	return nil
 }
 
+func (p *PageMatcherParamsConfig) hasSitesMatrix() bool {
+	if m, ok := p.Fields["sites"]; ok {
+		mm := maps.ToStringMap(m)
+		if sm, found := mm["matrix"]; found {
+			mmm := maps.ToStringMap(sm)
+			return len(mmm) > 0
+		}
+	}
+	return false
+}
+
 type PageMatcherParamsConfigs struct {
 	c []*config.ConfigNamespace[[]PageMatcherParamsConfig, CascadeConfig]
 }
@@ -347,16 +362,23 @@ func (c *PageMatcherParamsConfigs) SourceHash() uint64 {
 	return h.Sum64()
 }
 
-func (c *PageMatcherParamsConfigs) InitConfig(logger loggers.Logger, _ sitesmatrix.VectorStore, configuredDimensions *sitesmatrix.ConfiguredDimensions) error {
+func (c *PageMatcherParamsConfigs) InitConfig(logger loggers.Logger, defaultsIn sitesmatrix.VectorStore, configuredDimensions *sitesmatrix.ConfiguredDimensions) error {
 	if c == nil {
 		return nil
 	}
 	for _, cc := range c.c {
 		for i := range cc.Config.Cascades {
-			checkCascadePattern(logger, cc.Config.Cascades[i].Target)
-			if err := cc.Config.Cascades[i].Target.compileSitesMatrix(configuredDimensions); err != nil {
+			ccc := cc.Config.Cascades[i]
+			checkCascadePattern(logger, ccc.Target)
+			defaults := defaultsIn
+			hasSitesMatrix := ccc.hasSitesMatrix()
+			if hasSitesMatrix {
+				defaults = nil
+			}
+			if err := ccc.Target.compileSitesMatrix(defaults, configuredDimensions); err != nil {
 				return fmt.Errorf("failed to compile cascade target %d: %w", i, err)
 			}
+			cc.Config.Cascades[i] = ccc
 		}
 	}
 	return nil