communicate format output to all engines

[cscheid]

Via Max Kuhn:

Does quarto have built-in environmental variables (or similar) during qmd compilation that reflects the output type? Similar to knitr::is_html_output() but cross-language and more specific about the output type?
I’m trying to write single qmd files for books that get compiled in different formats. Any tools (e.g. chunk options etc) that make that easier would be fantastic.

[dragonstyle]

You can use conditional content at the markdown level: https://quarto.org/docs/authoring/conditional.html

The knitr functions like is_html_output should also still work.

[cscheid]

Right, but I still think we should have something that signals uniformly to Jupyter and knitr and future extensions; I think the question was posed in the context of running Python code.

[cscheid]

Reference: notebook.py:88 is the place to do this in Jupyter, execute.R:221 in R