A preprocessor bring cms to mdbook.
cargo install mdbook-cms
#cat /path/to/your/mdbook/book.toml
[book]
authors = []
language = "en"
multilingual = false
src = "src"
[build]
create-missing = false
#use cms preprocessor
[preprocessor.cms]
# meta/first-line/filename
title = "meta"
[output.html.fold]
enable = true
level = 0
When you run
mdbook serve
Or
mdbook build
this will also walk your mdbook src dir and generate the book summary in /path/to/your/mdbook/src/SUMMARY.md