Add site.Store and hugo.Store and Shortcode.Store

Closes #13021

hugolib/page_test.go

@@ -1893,3 +1893,52 @@ func TestRenderWithoutArgument(t *testing.T) {
 
 	b.Assert(err, qt.IsNotNil)
 }
+
+// Issue #13021
+func TestAllStores(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- hugo.toml --
+disableKinds = ["taxonomy", "term", "page", "section"]
+disableLiveReload = true
+-- content/_index.md --
+---
+title: "Home"
+---
+{{< s >}}
+-- layouts/shortcodes/s.html --
+{{ if not (.Store.Get "Shortcode") }}{{ .Store.Set "Shortcode" (printf "sh-%s" $.Page.Title) }}{{ end }}
+Shortcode: {{ .Store.Get "Shortcode" }}|
+-- layouts/index.html --
+{{ .Content }}
+{{ if not (.Store.Get "Page") }}{{ .Store.Set "Page" (printf "p-%s" $.Title) }}{{ end }}
+{{ if not (hugo.Store.Get "Hugo") }}{{ hugo.Store.Set "Hugo" (printf "h-%s" $.Title) }}{{ end }}
+{{ if not (site.Store.Get "Site") }}{{ site.Store.Set "Site" (printf "s-%s" $.Title) }}{{ end }}
+Page: {{ .Store.Get "Page" }}|
+Hugo: {{ hugo.Store.Get "Hugo" }}|
+Site: {{ site.Store.Get "Site" }}|
+`
+
+	b := TestRunning(t, files)
+
+	b.AssertFileContent("public/index.html",
+		`
+Shortcode: sh-Home|
+Page: p-Home|
+Site: s-Home|
+Hugo: h-Home|
+`,
+	)
+
+	b.EditFileReplaceAll("content/_index.md", "Home", "Homer").Build()
+
+	b.AssertFileContent("public/index.html",
+		`
+Shortcode: sh-Homer|
+Page: p-Homer|
+Site: s-Home|
+Hugo: h-Home|
+`,
+	)
+}