How can I use different page number locations on alternating pages?

Questions
,
1

How is it possible to place page numbers at the top left corners of odd pages and top right corners of even pages?

┌───────╥───────┐ ┌───────╥───────┐
│ 1     ║     2 │ │ 3     ║     4 │
│       ║       │ │       ║       │
│       ║       │ │       ║       │
│       ║       │ │       ║       │
└───────╨───────┘ └───────╨───────┘

Or maybe the other way around, which is in fact a more correct way to number pages according to book design traditions:

┌───────┐ ┌───────╥───────┐ ┌───────╥───────┐
│     1 │ │ 2     ║     3 │ │ 4     ║     5 │
│       │ │       ║       │ │       ║       │
│       │ │       ║       │ │       ║       │
│       │ │       ║       │ │       ║       │
└───────┘ └───────╨───────┘ └───────╨───────┘

( Page setup guide – Typst Documentation documentation page doesn’t seem to mention this trick. The closest thing I have found there is:

#set page(header: context {
  if counter(page).get().first() > 1 [
    ...
  ]
})

Which can probably be changed like “if page number is divisible by 2, then it is even; otherwise, it is odd”. But then, how to implement this if/else in code? )

2 
#set page(height: auto)

// Starting from left:
// #set page(header: context {
//   let page = counter(page).get().first()
//   let body = if calc.odd(page) [odd ] else [even ] + str(page)
//   let alignment = if calc.odd(page) { left } else { right }
//   align(alignment, body)
// })

// Starting from right (book style):
#set page(header: context {
  let page = counter(page).get().first()
  let body = if calc.odd(page) [odd ] else [even ] + str(page)
  let alignment = if calc.odd(page) { right } else { left }
  align(alignment, body)
})

#range(5).map(_ => pagebreak()).join()

image
image612×911 6.96 KB

This can be simplified to:

#set page(header: context {
  let page = counter(page).get().first()
  align(if calc.odd(page) { right } else { left })[#page]
})

I have a feeling that this might be achieved in some even easier way, but nothing else comes to mind.

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