Control font size code output

[JackCaster]

Description

Is it possible to change the font size of the output for a code block? By default, it is too large. My workaround is, for a PDF/Latex output, is to redefine the Highlight Verbatim environment (as found in the generated latex file) with

format:
  pdf:
    documentclass: article
    papersize: a4
    include-in-header:
      text: |
          \DefineVerbatimEnvironment{Highlighting}{Verbatim}{commandchars=\\\{\}, fontsize=\small}

but I find this solution a bit clunky. It would be nice to be able to redefine the font size with a YAML option, for example.

[cderv]

You could leverage the monofont options

---
title: Monospace font size
format: pdf
monofont: 'Latin Modern Mono'
monofontoptions: 'Scale=0.2'
keep-tex: true
---

```r
1 + 1
```

This works because the template is using \setmonofont from fontspec which can take option. Default engine for Quarto being xelatex, fontspec is used by default.

If you want more targeted, your solution seems ok to me.

FWIW This is Pandoc behavior here: jgm/pandoc#5491
Quarto does not have any specific option for code font size in LaTeX.

The pandoc issue refers to a Lua filter : https://github.com/chdemko/pandoc-latex-fontsize. It is a JSON filter, and could work with Quarto, though maybe a Lua filter port exists.

Anyhow, hope this helps understand.

[JackCaster]

Thanks, good to know. But I have many code-related words in the manuscript as well, and I guess that setting would affect also the in-text monofont (i.e., not only the monofont in the code block)?

[mcanouil]

The pandoc issue refers to a Lua filter : https://github.com/chdemko/pandoc-latex-fontsize. It is a JSON filter, and could work with Quarto, though maybe a Lua filter port exists.

For json filter, I believe 1.6 is required.