Format all numbers with comma thousands separator

[maia-sh]

Description

I would like to to format all numbers in my Quarto document using a comma thousands separator. For example, inline code that evaluates to 1500 should print as 1,500.

Currently, I need to wrap each number in a function to apply the formatting, e.g. r scales::comma(1500).

Ideally, I would like a document-level YAML option such as number-format to set all numbers.
I found the similar option for dates: date-format (see https://quarto.org/docs/reference/dates.html) (CORRECTION: This specifies the format of the date YAML field and NOT date throughout the document.)

Is there such an option that I'm not finding in the documentation?
Otherwise, happy to hear others' workarounds!

[rgaiacs]

Dear @maia-sh,

Because you are using knitr, you can use

knit_hooks$set(inline = function(x) {
  prettyNum(x, big.mark=" ")
})

at the begin of your documents as mentioned at https://stackoverflow.com/a/18967590/1802726.

[maia-sh]

Many thanks, @rgaiacs! I wasn't familiar with knitr hooks. This solution works, however, sweeps up non-numeric variables, i.e, dates.

Based on your suggestion as well as a stackoverflow discussion on formatting all dates, I added to the top of my Quarto document:

# Format integers
knit_print.integer = function(x, ...) {
  prettyNum(x, big.mark=",")
}

registerS3method(
  "knit_print", "integer", knit_print.integer,
  envir = asNamespace("knitr")
)

# Format dates
knit_print.Date = function(x, ...) {
  format(x, "%d %B %Y")
}

registerS3method(
  "knit_print", "Date", knit_print.Date,
  envir = asNamespace("knitr")
)

This prints 1,500 and 16 August 2023.

[mcanouil]

Indeed, this is something do be done within the language you are using or write a Lua filter that parses strings to detect number and rewrite/format them.