How can I show the heading number after the heading itself?

Questions
1

I want to make it so

= Section
== Subsection

shows as
1 Section
Subsection 1.1

I tried doing that using

#show heading.where(level: 2): it => box(strong(it.body + " "))

but that just shows the heading format string

2

You can get the heading number from the built-in counter. The counter requires context to evaluate/display, and the block is used to get the default behavior of a heading.

#set heading(numbering: "1.1")
#show heading.where(level: 2): it => context block(
  it.body + [ ] + counter(heading).display()
)

= A Section
== A Subsection
== Another Subsection
3

Hello. For this, you would have to recreate the default heading show rule from scratch and change its behavior:

#import "@preview/text-dirr:1.0.0": text-dir

#set heading(numbering: "1.")

#show heading.where(level: 2): it => {
  let body = [#it.body #counter(heading).display(it.numbering)]
  let indent = if it.hanging-indent == auto { 0pt } else { it.hanging-indent }
  if indent != 0pt { body = h(-indent) + body }
  let side = if text-dir() == ltr { "left" } else { "right" }
  block(sticky: true, inset: ((side): indent), body)
}

= Section
== Subsection
#heading(depth: 2, hanging-indent: 5em, numbering: "I.")[#lorem(15)]

image

Now that the text-dirr package is out, so you can fully copy the default behavior that uses “start” alignment or side, which depends on text.dir.