Torna carregamento de imagens "lazy" com extensão do asciidoctor (extensão asciidoctor)

build.sh

@@ -1,4 +1,4 @@
 #!/bin/bash
 set -e  # exit when any command fails
-asciidoctor livro.adoc -o index.html
+asciidoctor -r ./ferramentas/addLazyLoadingImages.rb livro.adoc -o index.html
 open index.html

ferramentas/addLazyLoadingImages.rb

@@ -0,0 +1,19 @@
+include Asciidoctor
+
+class AddLazyLoadingImages < Asciidoctor::Extensions::Postprocessor
+  def process document, output
+    if document.basebackend? 'html'
+      replacement = %(<img loading="lazy" \\1>)
+      output = output.gsub(/<img(.*?)>/m, replacement)
+    end
+    output
+  end
+end
+
+Asciidoctor::Extensions.register do
+  postprocessor AddLazyLoadingImages
+end
+
+Asciidoctor.convert_file 'livro.adoc', safe: :safe
+
+

livro.adoc

@@ -7,7 +7,6 @@ include::atributos-pt_BR.adoc[]
 :xrefstyle: short
 :sectnums:
 :sectlinks:
-:data-uri:
 :toc:
 :toclevels: 2
 :!chapter-signifier:
@@ -159,4 +158,4 @@ include::capitulos/cap21.adoc[]
 
 == 🚧 Descritores de atributos
 
-== 🚧 Metaprogramação com classes
+== 🚧 Metaprogramação com classes