This work is based on an old (before June 2018) 1.5.6 version of

https://github.com/asciidoctor/asciidoctor-gradle-plugin

You can find remnants in the official code under org.asciidoctor.gradle.compat, when it was created with

https://github.com/ysb33r/asciidoctor-gradle-plugin/commit/1ad29b2eba915f7bce3cb004e3e9582578c8ac72

License: Apache 2.0