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, 12 insertions, 14 deletions

diff --git a/hugolib/hugo_sites_multihost_test.go b/hugolib/hugo_sites_multihost_test.go
index 83d6bfc9e..999d94559 100644
--- a/hugolib/hugo_sites_multihost_test.go
+++ b/hugolib/hugo_sites_multihost_test.go
@@ -3,6 +3,8 @@ package hugolib
 import (
 	"testing"
 
+	"github.com/gohugoio/hugo/resources/page"
+
 	"github.com/stretchr/testify/require"
 )
 
@@ -55,7 +57,7 @@ languageName = "Nynorsk"
 
 	s1 := b.H.Sites[0]
 
-	s1h := s1.getPage(KindHome)
+	s1h := s1.getPage(page.KindHome)
 	assert.True(s1h.IsTranslated())
 	assert.Len(s1h.Translations(), 2)
 	assert.Equal("https://example.com/docs/", s1h.Permalink())
@@ -66,9 +68,8 @@ languageName = "Nynorsk"
 	// For multihost, we never want any content in the root.
 	//
 	// check url in front matter:
-	pageWithURLInFrontMatter := s1.getPage(KindPage, "sect/doc3.en.md")
+	pageWithURLInFrontMatter := s1.getPage(page.KindPage, "sect/doc3.en.md")
 	assert.NotNil(pageWithURLInFrontMatter)
-	assert.Equal("/superbob", pageWithURLInFrontMatter.URL())
 	assert.Equal("/docs/superbob/", pageWithURLInFrontMatter.RelPermalink())
 	b.AssertFileContent("public/en/superbob/index.html", "doc3|Hello|en")
 
@@ -78,7 +79,7 @@ languageName = "Nynorsk"
 
 	s2 := b.H.Sites[1]
 
-	s2h := s2.getPage(KindHome)
+	s2h := s2.getPage(page.KindHome)
 	assert.Equal("https://example.fr/", s2h.Permalink())
 
 	b.AssertFileContent("public/fr/index.html", "French Home Page", "String Resource: /docs/text/pipes.txt")
@@ -94,22 +95,19 @@ languageName = "Nynorsk"
 
 	// Check bundles
 
-	bundleEn := s1.getPage(KindPage, "bundles/b1/index.en.md")
+	bundleEn := s1.getPage(page.KindPage, "bundles/b1/index.en.md")
 	require.NotNil(t, bundleEn)
 	require.Equal(t, "/docs/bundles/b1/", bundleEn.RelPermalink())
-	require.Equal(t, 1, len(bundleEn.Resources))
-	logoEn := bundleEn.Resources.GetMatch("logo*")
-	require.NotNil(t, logoEn)
-	require.Equal(t, "/docs/bundles/b1/logo.png", logoEn.RelPermalink())
+	require.Equal(t, 1, len(bundleEn.Resources()))
+
 	b.AssertFileContent("public/en/bundles/b1/logo.png", "PNG Data")
+	b.AssertFileContent("public/en/bundles/b1/index.html", " image/png: /docs/bundles/b1/logo.png")
 
-	bundleFr := s2.getPage(KindPage, "bundles/b1/index.md")
+	bundleFr := s2.getPage(page.KindPage, "bundles/b1/index.md")
 	require.NotNil(t, bundleFr)
 	require.Equal(t, "/bundles/b1/", bundleFr.RelPermalink())
-	require.Equal(t, 1, len(bundleFr.Resources))
-	logoFr := bundleFr.Resources.GetMatch("logo*")
-	require.NotNil(t, logoFr)
-	require.Equal(t, "/bundles/b1/logo.png", logoFr.RelPermalink())
+	require.Equal(t, 1, len(bundleFr.Resources()))
 	b.AssertFileContent("public/fr/bundles/b1/logo.png", "PNG Data")
+	b.AssertFileContent("public/fr/bundles/b1/index.html", " image/png: /bundles/b1/logo.png")
 
 }