node to page: Export GetPage to the templates

Updates #2297

hugolib/site.go

@@ -1653,6 +1653,19 @@ func (s *Site) Stats() {
 
 }
 
+// GetPage looks up a index page of a given type in the path given.
+// This method may support regular pages in the future, but currently it is a
+// convenient way of getting the home page or
+// a section from a template:
+//    {{ with .Site.GetPage "section" "blog" }}{{ .Title }}{{ end }}
+//
+// This will return nil when no page could be found.
+//
+// The valid page types are: home, section, taxonomy and taxonomyTerm
+func (s *SiteInfo) GetPage(typ PageType, path ...string) *Page {
+	return s.getPage(typ, path...)
+}
+
 func (s *SiteInfo) permalink(plink string) string {
 	return s.permalinkStr(plink)
 }