bookdown::gitbook:
  config:
    toc:
      before: |
        <li><a href="./">R语言数据分析组队学习</a></li>
    download: null
    sharing:
      facebook: no
      github: yes
      twitter: no
      linkedin: yes
      weibo: yes
      instapaper: no
      vk: no
      whatsapp: no
      all: ['facebook', 'twitter', 'linkedin', 'weibo', 'instapaper', 'whatsapp']
  
bookdown::pdf_book:
  pandoc_args: --listings
  latex_engine: xelatex
  keep_tex: yes
  toc_unnumbered: no
  template: template.tex  
  includes:
    in_header: preamble.tex