Invalid resolution of files in block macro for non-antora setup

[zeldigas]

Setup

.
└── sample
    ├── _assets
    │   └── test.puml
    └── test.adoc

With the following content in test.adoc:

= Test document

Take a look at plantuml feature:

plantuml::_assets/test.puml[]

Problem

I'm converting file with the following command: asciidoctor -r asciidoctor-kroki -D out sample/test.adoc

Expected behavior: _assets/test.puml file is propertly resolved relative to test.adoc, whenever I'm located in parent dir or in sample

Actual behavior: I got error:

sciidoctor: ERROR: test.adoc: line 5: Failed to read plantuml file: _assets/test.puml. No such file or directory @ rb_sysopen - _assets/test.puml.

File is only converted correctly when I place _assets dir, relative to location of workdir where I execute command.

Comparision with asciidoctor-diagram

asciidoctor-diagram module properly resolve file, I dont' get error with the following command: asciidoctor -r asciidoctor-diagram -D out sample/test.adoc

Possible issue

kroki extension uses raw target without resolution:

• https://github.com/asciidoctor/asciidoctor-kroki/blob/master/ruby/lib/asciidoctor/extensions/asciidoctor_kroki/extension.rb#L83
• https://github.com/asciidoctor/asciidoctor-kroki/blob/master/ruby/lib/asciidoctor/extensions/asciidoctor_kroki/extension.rb#L65
• https://github.com/asciidoctor/asciidoctor-kroki/blob/master/ruby/lib/asciidoctor/extensions/asciidoctor_kroki/extension.rb#L96

To compare, asciidoctor-diagram resolves target with normalize_system_path method: https://github.com/asciidoctor/asciidoctor-diagram/blob/9f1f9352bff950df0eae7790a85b5cd85c99c2f0/lib/asciidoctor-diagram/diagram_processor.rb#L396