hugolib: Add hugo.Sites and .Site.IsDefault(), modify .Site.Sites

Changes:

- Add hugo.Sites to return all sites for all dimensions
- Modify .Site.Sites to return all sites for all dimensions
- Deprecate .Site.Sites in favor of hugo.Sites
- Add .Site.IsDefault() to report whether the current site is the
  default site across all dimensions
- Consolidate tests

Closes #14479
Closes #14481

Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

resources/page/page_matcher_test.go

@@ -27,8 +27,16 @@ import (
 
 func TestPageMatcher(t *testing.T) {
 	c := qt.New(t)
-	developmentTestSite := testSite{h: hugo.NewInfo(testConfig{environment: "development"}, nil)}
-	productionTestSite := testSite{h: hugo.NewInfo(testConfig{environment: "production"}, nil)}
+
+	opts := hugo.HugoInfoOptions{
+		Conf: testConfig{environment: "development"},
+	}
+	developmentTestSite := testSite{h: hugo.NewInfo(opts, nil)}
+
+	opts = hugo.HugoInfoOptions{
+		Conf: testConfig{environment: "production"},
+	}
+	productionTestSite := testSite{h: hugo.NewInfo(opts, nil)}
 
 	dec := cascadeConfigDecoder{}
 

resources/page/site.go

@@ -77,12 +77,15 @@ type Site interface {
 	// Returns the configured copyright information for this Site.
 	Copyright() string
 
-	// Returns all Sites for all languages.
+	// Returns all sites for all dimensions.
 	Sites() Sites
 
 	// Returns Site currently rendering.
 	Current() Site
 
+	// Reports whether this site is the default across all dimensions.
+	IsDefault() bool
+
 	// Returns a struct with some information about the build.
 	Hugo() hugo.HugoInfo
 
@@ -120,8 +123,9 @@ type Site interface {
 	LanguagePrefix() string
 
 	hstore.StoreProvider
+
 	// String returns a string representation of the site.
-	// Note that this represenetation may change in the future.
+	// Note that this representation may change in the future.
 	String() string
 
 	// For internal use only.
@@ -239,6 +243,10 @@ func (s *siteWrapper) Current() Site {
 	return s.s.Current()
 }
 
+func (s *siteWrapper) IsDefault() bool {
+	return s.s.IsDefault()
+}
+
 func (s *siteWrapper) Config() SiteConfig {
 	return s.s.Config()
 }
@@ -350,6 +358,10 @@ func (t testSite) Current() Site {
 	return t
 }
 
+func (t testSite) IsDefault() bool {
+	return true
+}
+
 func (s testSite) LanguagePrefix() string {
 	return ""
 }
@@ -439,8 +451,11 @@ func (s testSite) CheckReady() {
 
 // NewDummyHugoSite creates a new minimal test site.
 func NewDummyHugoSite(conf config.AllProvider) Site {
+	opts := hugo.HugoInfoOptions{
+		Conf: conf,
+	}
 	return testSite{
-		h: hugo.NewInfo(conf, nil),
+		h: hugo.NewInfo(opts, nil),
 		l: &langs.Language{
 			Lang: "en",
 		},