Setting code chunk size on Quarto pdf output

Question

Any idea how to set a small size for code chunks on Quarto pdf output ? I don't want my code to have the same size of my text, but I can't find an argument in the settings in the begining of my document nor in the R code chunk to specify a font size.

Answer 1

You can do this locally with LaTeX font options:

---
title: "chunk-size"
format: pdf
editor: visual
---

\tiny
```{r}
summary(mtcars$mpg)
```
\normalsize

You can use Huge > huge > LARGE > Large > large > normalsize > small > footnotesize > scriptsize > tiny.

Answer 2

You can write an knitr-hooks to create a chunk option (suppose size) to control the font size of code chunk (source-code + chunk-output).

Then, we can set, for example, size: scriptsize chunk option for a code-chunk to get a smaller font size than the usual text (which has, by default, font size equals to \normalsize.

---
title: "Small Font Size for Code chunk"
format: pdf
---

## Quarto

```{r}
#| echo: false

default_chunk_hook  <- knitr::knit_hooks$get("chunk")

latex_font_size <- c("Huge", "huge", "LARGE", "Large", 
                     "large", "normalsize", "small", 
                     "footnotesize", "scriptsize", "tiny")

knitr::knit_hooks$set(chunk = function(x, options) {
  x <- default_chunk_hook(x, options)
  if(options$size %in% latex_font_size) {
    paste0("\n \\", options$size, "\n\n", 
      x, 
      "\n\n \\normalsize"
    )
  } else {
    x
  }
})

```

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```{r}
#| eval: false
#| size: scriptsize

print("This is r code")
print("This is r code")
print("This is r code")
print("And this has samller font size")
```

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smod libero facilisi

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