Quarto: Running different R code in dependency of the output format

October 8, 2022

I have a qmd Quarto file with different output formats, html and pdf.

My goal is, to generate graphics in dependence of the output format.

How can I detect in an R cell, if the processing output format is html or pdf?
A simple if statement would be sufficient.

---
title: My title 

format:
  html:
    toc: true
    toc-depth: 3
    html-math-method: katex
  pdf:
    keep-tex: true
    toc: true
    number-sections: true
    colorlinks: true
---

´´´

>Solution :

Using knitr::is_html_output you could do:

---
title: My title 
format:
   html:
    toc: true
    toc-depth: 3
    html-math-method: katex
  pdf:
    keep-tex: true
    toc: true
    number-sections: true
    colorlinks: true
---

```{r}
if (knitr::is_html_output()) {
  print("HTML")
} else {
  print("pdf")
}
```

Which in case of html will give: