_output.yml

bookdown::gitbook:
  css: style.css
  split_by: chapter
  config:
    toc:
      collapse: subsection
      before: |
        <li><a href="./">The Unix Workbench</a></li>
      after: |
        <li><a href="https://github.com/rstudio/bookdown" target="blank">Published with bookdown</a></li>
  includes:
    in_header: [google_analytics.html]
bookdown::html_chapters:
  css: [style.css, toc.css]
bookdown::pdf_book:
  includes:
    in_header: preamble.tex
  latex_engine: xelatex
  citation_package: natbib
bookdown::epub_book:
  stylesheet: style.css