tpl: Update Twitter card to also consider images in .Resources

The new lookup order:

1) Page.Params.images if set
2) Image resources: images with name "feature" (priority), "cover", "thumbnail"
3) Site.Params.images if set

Fixes #4349

diff --git a/tpl/tplimpl/template_embedded.go b/tpl/tplimpl/template_embedded.go
index 0b42da7c393f9106a99af6d2b48d1b3605443876..b54a4bbecf92a33d07aa640dbf5c69a49b12e638 100644 (file)
--- a/tpl/tplimpl/template_embedded.go
+++ b/tpl/tplimpl/template_embedded.go
@@ -231,12 +231,25 @@ func (t *templateHandler) embedTemplates() {
 <!-- Facebook Page Admin ID for Domain Insights -->
 {{ with .Site.Social.facebook_admin }}<meta property="fb:admins" content="{{ . }}" />{{ end }}`)
 
-       t.addInternalTemplate("", "twitter_cards.html", `{{- with $.Param "images" -}}
+       t.addInternalTemplate("", "twitter_cards.html", `{{- with $.Params.images -}}
+<meta name="twitter:card" content="summary_large_image"/>
+<meta name="twitter:image:src" content="{{ index . 0 | absURL }}"/>
+{{ else -}}
+{{- $images := $.Resources.ByType "image" -}}
+{{- $featured := $images.GetMatch "*feature*" -}}
+{{- $featured := cond (ne $featured nil) $featured ($images.GetMatch "{*cover*,*thumbnail*}") -}}
+{{- with $featured -}}
+<meta name="twitter:card" content="summary_large_image"/>
+<meta name="twitter:image:src" content="{{ $featured.Permalink }}"/>
+{{- else -}}
+{{- with $.Site.Params.images -}}
 <meta name="twitter:card" content="summary_large_image"/>
 <meta name="twitter:image:src" content="{{ index . 0 | absURL }}"/>
 {{ else -}}
 <meta name="twitter:card" content="summary"/>
 {{- end -}}
+{{- end -}}
+{{- end }}
 <meta name="twitter:title" content="{{ .Title }}"/>
 <meta name="twitter:description" content="{{ with .Description }}{{ . }}{{ else }}{{if .IsPage}}{{ .Summary }}{{ else }}{{ with .Site.Params.description }}{{ . }}{{ end }}{{ end }}{{ end -}}"/>
 {{ with .Site.Social.twitter -}}