Why does my header code no longer work in Typst 0.13?

Questions
,
1

The following code is used to indicate the title of the chapter at the top of a presentation.
This no longer works in 0.13.
Can anyone solve this function?
Thank you for your reply.

#let current-chapter-title() = locate(loc => {
  let headings = query(selector(heading.where(level:1)).before(loc))
  if headings != () {
    headings.last().body
  } else {
    "Aucun titre trouvé"
  }
})

Example 1

In this chapter (#current-chapter-title())...

Example 2

#set page(columns: 1,height: 1080pt, width: 1920pt, margin: (top: 55mm, right: 30mm, bottom: 30mm, left: 35mm), 
background: [#image("2.jpg", width: 101%)], 
header: [#place(dx: 1mm, dy: 9mm, left, text([#context counter(heading).display() - #current-chapter-title() | page #context counter(page).display()]
,stroke: 0pt, size: 40pt, font: "DejaVu Serif"))]
)

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2

Hey. This is a breaking change. You should look at any breaking changes in the new version before switching to it.

#let current-chapter-title() = context {
  let headings = query(heading.where(level: 1).before(here()))
  if headings == () { panic("Aucun titre trouvé") }
  headings.last().body
}

= Heading

#current-chapter-title()
1 Like
3

Hey @Suizii, welcome to the forum! I’ve changed your question post’s title to better fit our guidelines: How to post in the Questions category

Make sure your title is a question you’d ask to a friend about Typst. :wink:

4

To further clarify Andrew’s answer: the original functionality of the locate function was removed in Typst 0.13 (after being deprecated since Typst 0.11), and should be replaced with context { ... }. To get loc again, you can use let loc = here(), but that’s usually no longer necessary, as most operations which previously required a loc no longer do. Some examples:

// Before Typst 0.11:
#locate(loc => {
  let header-numbers = counter(heading).at(loc)
  let all-headings = query(heading, loc)
  let last-value-of-my-state = state("key", 3).final(loc)
  let headings-before-here = query(selector(heading).before(loc))
  let current-page = loc.page()

  // ...
})

// After Typst 0.11:
#context {
  let header-numbers = counter(heading).get()
  let all-headings = query(heading)
  let last-value-of-my-state = state("key", 3).final()

  // These still need the current location
  // It can be retrieved with `here()`
  let headings-before-here = query(selector(heading).before(here()))
  let current-page = here().page()

  // ...
})

Note that the function named locate now has a new purpose: locate(<abc>) in a context will now return the location object of something with that label.

2 Likes
5

thank you for taking the time to explain this to me