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node to page: Export GetPage to the templates

Updates #2297

--- a/hugolib/node_as_page_test.go

+++ b/hugolib/node_as_page_test.go

@@ -70,6 +70,7 @@

 		"# Pages: 9",

 		"Date: 2009-01-02",

 		"Lastmod: 2009-01-03",

+		"GetPage: Section1 ",

 	)

 	assertFileContent(t, filepath.Join("public", "sect1", "regular1", "index.html"), false, "Single Title: Page 01", "Content Page 01")

@@ -543,6 +544,7 @@

 {{ end }}

 Date: {{ .Date.Format "2006-01-02" }}

 Lastmod: {{ .Lastmod.Format "2006-01-02" }}

+GetPage: {{ with .Site.GetPage "section" "sect1" }}{{ .Title }}{{ end }} 

 `)

 	writeSource(t, filepath.Join("layouts", "_default", "single.html"), `

--- a/hugolib/page_collections.go

+++ b/hugolib/page_collections.go

@@ -65,8 +65,8 @@

 	return c.findPagesByNodeTypeIn(n, c.Pages)

 }

-func (c *PageCollections) getPage(n PageType, path ...string) *Page {

-	pages := c.findPagesByNodeTypeIn(n, c.Pages)

+func (c *PageCollections) getPage(typ PageType, path ...string) *Page {

+	pages := c.findPagesByNodeTypeIn(typ, c.Pages)

 	if len(pages) == 0 {

 		return nil

--- a/hugolib/site.go

+++ b/hugolib/site.go

@@ -1653,6 +1653,19 @@

 }

+// 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)

 }