Make Page an interface

The main motivation of this commit is to add a `page.Page` interface to replace the very file-oriented `hugolib.Page` struct.
This is all a preparation step for issue  #5074, "pages from other data sources".

But this also fixes a set of annoying limitations, especially related to custom output formats, and shortcodes.

Most notable changes:

* The inner content of shortcodes using the `{{%` as the outer-most delimiter will now be sent to the content renderer, e.g. Blackfriday.
  This means that any markdown will partake in the global ToC and footnote context etc.
* The Custom Output formats are now "fully virtualized". This removes many of the current limitations.
* The taxonomy list type now has a reference to the `Page` object.
  This improves the taxonomy template `.Title` situation and make common template constructs much simpler.

See #5074
Fixes #5763
Fixes #5758
Fixes #5090
Fixes #5204
Fixes #4695
Fixes #5607
Fixes #5707
Fixes #5719
Fixes #3113
Fixes #5706
Fixes #5767
Fixes #5723
Fixes #5769
Fixes #5770
Fixes #5771
Fixes #5759
Fixes #5776
Fixes #5777
Fixes #5778

1 files changed, 23 insertions, 2 deletions

diff --git a/hugolib/rss_test.go b/hugolib/rss_test.go
index db26c7d2d..683a737c5 100644
--- a/hugolib/rss_test.go
+++ b/hugolib/rss_test.go
@@ -1,4 +1,4 @@
-// Copyright 2016 The Hugo Authors. All rights reserved.
+// Copyright 2019 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -47,7 +47,7 @@ func TestRSSOutput(t *testing.T) {
 	// Section RSS
 	th.assertFileContent(filepath.Join("public", "sect", rssURI), "<?xml", "rss version", "Sects on RSSTest")
 	// Taxonomy RSS
-	th.assertFileContent(filepath.Join("public", "categories", "hugo", rssURI), "<?xml", "rss version", "Hugo on RSSTest")
+	th.assertFileContent(filepath.Join("public", "categories", "hugo", rssURI), "<?xml", "rss version", "hugo on RSSTest")
 
 	// RSS Item Limit
 	content := readDestination(t, fs, filepath.Join("public", rssURI))
@@ -74,3 +74,24 @@ func TestRSSKind(t *testing.T) {
 
 	b.AssertFileContent("public/index.xml", "RSS Kind: home")
 }
+
+func TestRSSCanonifyURLs(t *testing.T) {
+	t.Parallel()
+
+	b := newTestSitesBuilder(t)
+	b.WithSimpleConfigFile().WithTemplatesAdded("index.rss.xml", `<rss>{{ range .Pages }}<item>{{ .Content | html }}</item>{{ end }}</rss>`)
+	b.WithContent("page.md", `---
+Title: My Page
+---
+
+Figure:
+
+{{< figure src="/images/sunset.jpg" title="Sunset" >}}
+
+
+
+`)
+	b.Build(BuildCfg{})
+
+	b.AssertFileContent("public/index.xml", "img src=&#34;http://example.com/images/sunset.jpg")
+}