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, 24 insertions, 20 deletions

diff --git a/hugolib/page_permalink_test.go b/hugolib/page_permalink_test.go
index 76b0b8635..ed6eb11e3 100644
--- a/hugolib/page_permalink_test.go
+++ b/hugolib/page_permalink_test.go
@@ -1,4 +1,4 @@
-// Copyright 2015 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.
@@ -63,40 +63,44 @@ func TestPermalink(t *testing.T) {
 	}
 
 	for i, test := range tests {
+		t.Run(fmt.Sprintf("%s-%d", test.file, i), func(t *testing.T) {
 
-		cfg, fs := newTestCfg()
+			cfg, fs := newTestCfg()
 
-		cfg.Set("uglyURLs", test.uglyURLs)
-		cfg.Set("canonifyURLs", test.canonifyURLs)
-		cfg.Set("baseURL", test.base)
+			cfg.Set("uglyURLs", test.uglyURLs)
+			cfg.Set("canonifyURLs", test.canonifyURLs)
+			cfg.Set("baseURL", test.base)
 
-		pageContent := fmt.Sprintf(`---
+			pageContent := fmt.Sprintf(`---
 title: Page
 slug: %q
 url: %q
+output: ["HTML"]
 ---
 Content
 `, test.slug, test.url)
 
-		writeSource(t, fs, filepath.Join("content", filepath.FromSlash(test.file)), pageContent)
+			writeSource(t, fs, filepath.Join("content", filepath.FromSlash(test.file)), pageContent)
 
-		s := buildSingleSite(t, deps.DepsCfg{Fs: fs, Cfg: cfg}, BuildCfg{SkipRender: true})
-		require.Len(t, s.RegularPages, 1)
+			s := buildSingleSite(t, deps.DepsCfg{Fs: fs, Cfg: cfg}, BuildCfg{SkipRender: true})
+			require.Len(t, s.RegularPages(), 1)
 
-		p := s.RegularPages[0]
+			p := s.RegularPages()[0]
 
-		u := p.Permalink()
+			u := p.Permalink()
 
-		expected := test.expectedAbs
-		if u != expected {
-			t.Fatalf("[%d] Expected abs url: %s, got: %s", i, expected, u)
-		}
+			expected := test.expectedAbs
+			if u != expected {
+				t.Fatalf("[%d] Expected abs url: %s, got: %s", i, expected, u)
+			}
 
-		u = p.RelPermalink()
+			u = p.RelPermalink()
 
-		expected = test.expectedRel
-		if u != expected {
-			t.Errorf("[%d] Expected rel url: %s, got: %s", i, expected, u)
-		}
+			expected = test.expectedRel
+			if u != expected {
+				t.Errorf("[%d] Expected rel url: %s, got: %s", i, expected, u)
+			}
+		})
 	}
+
 }