Rmarkdown无法识别Pandoc过滤器

Question

I would like to call a pandoc filter ( this one ) from rmarkdown/RStudio. However, pandoc seems not to recognize the filter. I've handed over the filter in the YAML header. Consider this rmd file:

---
title: "test"
output: pdf_document
header-includes:
    - \usepackage{xspace}
pandoc_args:
    - --filter
    - pandoc-filter/typography.py
---

test  
s.S. 

The knitting output shows no sign that the filter was handed over to pandoc:

/usr/local/bin/pandoc +RTS -K512m -RTS test_typography-py.utf8.md --to latex --from markdown+autolink_bare_uris+ascii_identifiers+tex_math_single_backslash --output test_typography-py.pdf --template /Library/Frameworks/R.framework/Versions/3.4/Resources/library/rmarkdown/rmd/latex/default-1.17.0.2.tex --highlight-style tango --pdf-engine pdflatex --variable graphics=yes --variable 'geometry:margin=1in'

The rendered pdf file does not show the effects of the filter, see image

(The effect of the filter is to render a thin space between phrases such as "zB" or "eg".)

What can I do to get this filter run by pandoc via rmarkdown (preferably using the YAML header)?

Answer 1

I just realized (thanks to @NMarkgraf) that I had an intendation error. The correct intendation in YAML is this:

---
title: "test"
header-includes:
  - \usepackage{xspace}
output: 
  pdf_document:
    pandoc_args:
      - --filter
      - typography.py
---

Then it works - the filter is recognized.