asciidocify filter failing when base_dir: :docdir

[briandominick]

I started getting errors from any use of asciidocify filter in a new project.

1: from /home/username/.rbenv/versions/2.6.6/lib/ruby/gems/2.6.0/gems/asciidoctor-2.0.14/lib/asciidoctor/document.rb:392:in `initialize'
/home/username/.rbenv/versions/2.6.6/lib/ruby/gems/2.6.0/gems/asciidoctor-2.0.14/lib/asciidoctor/document.rb:392:in `expand_path': asciidoctor: FAILED: <stdin>: Failed to load AsciiDoc document - no implicit conversion of Symbol into String (TypeError)

It turns out the symbol it's referring to is the :docdir in the Liquid context, which is explicitly recommended (and very handy). I don't know how this is suddenly happening. I have not used aciidocify much in the past, but I tested this on a fresh codebase with the same results.

To reproduce, set asciidoctor:base_dir to :docdir and use asciidocify anywhere.

I'm using:

• jekyll-asciidoc 3.0.0
• asciidoctor 2.0.14
• jekyll 4.2.0
• On Fedora 33
• running Ruby 2.6.6p146

If I change docinfo to . or any explicit path, the base path and asciidocify work as expected.