HOWTO: The text can be found per-chapter in `./pages/{chapter}.adoc` but each chapter includes code snippets found in a respective `./chapters-data/code/{chapter}/` subdirectory. So, perhaps a hacky way to do it but quite lazy to fully figure asciidoctor flags, created using a script a combined book.adoc that includes all others with `include::{chapter}.adoc` directives, then run `asciidoctor-pdf -a sourcedir=../chapters-data/code -r asciidoctor-diagram -o book.pdf ./pages/book.adoc`.