Provide latex_extension option when compling PDF

[hongyuanjia]

In bookdown, basically, I want to preserve Chinese quotation marks in the PDF output. This is related to https://stackoverflow.com/questions/52052231/how-to-write-chinese-quotes-in-bookdown

The reason why adding md_extensions: -smart did not work is that in pandoc, smart extension is enabled for latex by default, no matter latex is the input or output.

pandoc --version
# pandoc 2.6
# Compiled with pandoc-types 1.17.5.4, texmath 0.11.2, skylighting 0.7.6
# Default user data directory: /home/hongyuanjia/.pandoc
# Copyright (C) 2006-2019 John MacFarlane
# Web:  http://pandoc.org
# This is free software; see the source for copying conditions.
# There is no warranty, not even for merchantability or fitness
# for a particular purpose.

pandoc --list-extensions=latex | grep "smart"
# +smart

So the only way to achieve this is to disable the smart extension both for markdown and latex.

echo "“”" | pandoc -f markdown-smart -t latex
# ``''

echo "“”" | pandoc -f markdown-smart -t latex-smart
# “”

However, in bookdown, the PDF is compiled using pandoc with only "-t latex", and there is no such latex_extension option to modify latex extension in pandoc.

[yihui]

Please try the dev version of rmarkdown (remotes::install_github('rstudio/rmarkdown')), in which I have added an argument output_extensions. Example usage:

output:
  bookdown::pdf_book:
    md_extensions: -smart
    output_extensions: -smart

[hongyuanjia]

Thanks, @yihui. I can confirm that this has been fixed using the development version of rmarkdown.

[yihui]

Perfect. Thanks for letting me know!

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