Why there are still blanks when I use numbering.trim

Questions
,
1

This is my minimal reproduction

#show heading.where(level: 1):set heading(numbering: "A")

#let get-current-chapter-num() = context [
  #let heading-counter = counter(heading).get()
  #let chapter = if heading-counter.len() > 0 {
    let current-heading = query(selector(heading.where(level: 1)).before(here())).last()
    numbering(current-heading.numbering, heading-counter.at(0)).trim() // at here
  } else { "0" }
  #chapter
]

= Test
Here is in chapter-#get-current-chapter-num()\.

Although I have trimed the numbering output, but it still puts whitespace around the numbering.

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image755×259 20.7 KB

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image779×286 21.2 KB

And how do I remove these whitespaces around?
Thank you.

2

Ok…it seems to be the prank of content type.
I finally resolved it by returing string directly.

#let get-current-chapter-num() = context {
  let heading-counter = counter(heading).get()
  let chapter = if heading-counter.len() > 0 {
    let current-heading = query(selector(heading.where(level: 1)).before(here())).last()
    return numbering(current-heading.numbering, heading-counter.at(0)).trim()
  } else { "0" }
  return chapter.trim()
}
3

The issue is that you are using non-inline markup mode in the context block instead of code.

I don’t know why you need just a chapter number, but here is an easy solution:

#show heading.where(level: 1): set heading(numbering: "A")

#let get-current-chapter-num() = context {
  let selector = heading.where(level: 1).before(here())
  let previous-headings = query(selector)
  if previous-headings.len() == 0 { return 0 }
  counter(selector).display(previous-headings.last().numbering)
}

But it looks like a @heading without the label. So something like this can be used:

#show heading.where(level: 1): set heading(
  numbering: "A",
  supplement: "Chapter",
)

#let heading-reference(element) = {
  let nums = counter(heading).at(element.location())
  let numering = numbering(element.numbering, ..nums)
  link(element.location(), [#element.supplement~#numering])
}

#let get-current-chapter() = context {
  let last-headings = query(selector(heading.where(level: 1)).before(here()))
  if last-headings.len() == 0 [Chapter 0] else {
    heading-reference(last-headings.last())
  }
}

We can’t fetch heading.where(level: 1).supplement yet (Resolve the nested element styles within a `context` · Issue #5574 · typst/typst · GitHub), so the default value must be hard-coded, if it will be used at all.

Here is in #get-current-chapter().

= Test
== Test
Here is in #get-current-chapter().

= Test
== Test
Here is in #get-current-chapter().

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