Add page.Store

Fixes #9546

resources/page/page.go

@@ -261,7 +261,15 @@ type PageWithoutContent interface {
 	// Helper methods
 	ShortcodeInfoProvider
 	compare.Eqer
+
+	// Scratch returns a Scratch that can be used to store temporary state.
+	// Note that this Scratch gets reset on server rebuilds. See Store() for a variant that survives.
 	maps.Scratcher
+
+	// Store returns a Scratch that can be used to store temporary state.
+	// In contrast to Scratch(), this Scratch is not reset on server rebuilds.
+	Store() *maps.Scratch
+
 	RelatedKeywordsProvider
 
 	// GetTerms gets the terms of a given taxonomy,

resources/page/page_nop.go

@@ -418,6 +418,10 @@ func (p *nopPage) Scratch() *maps.Scratch {
 	return nil
 }
 
+func (p *nopPage) Store() *maps.Scratch {
+	return nil
+}
+
 func (p *nopPage) RelatedKeywords(cfg related.IndexConfig) ([]related.Keyword, error) {
 	return nil, nil
 }

resources/page/testhelpers_test.go

@@ -498,6 +498,10 @@ func (p *testPage) Scratch() *maps.Scratch {
 	panic("not implemented")
 }
 
+func (p *testPage) Store() *maps.Scratch {
+	panic("not implemented")
+}
+
 func (p *testPage) RelatedKeywords(cfg related.IndexConfig) ([]related.Keyword, error) {
 	v, err := p.Param(cfg.Name)
 	if err != nil {