// The template every file under content/ applies.
//
// Its only job is to emit the `<site-meta>` record the build script reads and
// then get out of the way. There is deliberately no styling here: the HTML
// target emits semantic markup and style/main.scss dresses it, so a show rule
// that set fonts or margins would be describing a page that is never rendered.
#let post(
  title: none,
  date: none,
  tags: (),
  summary: "",
  draft: false,
  body,
) = {
  assert(title != none, message: "a post needs a title")

  // Formatted here rather than passed as a `datetime`: Typst values reach Rust
  // through serde_json, and a datetime has no stable representation there.
  let stamp = if date == none { "" } else {
    date.display("[year]-[month]-[day]")
  }

  [#metadata((
    title: title,
    date: stamp,
    tags: tags,
    summary: summary,
    draft: draft,
  ))<site-meta>]

  body
}