This may seem trivial, but I don't see how to use
asciidoctor to create processed and plain-text formatted output.
I'm using this for now:
asciidoctor -o - INPUTFILE | html2txt -style pretty
The benefit is that the output text file has had the numbered sections and outlines rendered, along with any tables, into a prettier format. It's not too far from man format without the strictly required man page sections.
Is there a way to do this entirely with asciidoctor?