Add copy button for dotted config properties

Author: michalvavrik

_config.yml

@@ -100,6 +100,7 @@ asciidoctor:
     icons: font
     outfilesuffix: ''
     add-copy-button-to-env-var: true
+    add-config-property-copy-button: true
 
 # Pages permalink
 defaults:

_plugins/asciidoctor-extension.rb

@@ -52,6 +52,18 @@
   end
 end
 
+config_property_id=0
+Extensions.register do
+  inline_macro do
+    named :config_property_copy_button
+    resolve_attributes false
+    process do |parent, target, attrs|
+      copy_btn = %(<button class="btn-copy fa fa-clipboard inline-btn-copy" data-clipboard-action="copy" data-clipboard-target="#config-property-#{config_property_id}" title="Copy to clipboard" do-not-collapse="true"></button>)
+      config_property_id += 1
+      create_inline_pass parent, %(#{copy_btn})
+    end
+  end
+end
 
 ### ALL CONFIG page processors