lib.typ

#let zine(
  zine_page_margin: 8pt,
  draw_border: true,
  digital: false,
  contents: ()
) = {
  if digital {
    set page(height: 4.25in, width: 2.75in, margin: zine_page_margin)
    for (i, page) in contents.enumerate() {
      if i > 0 { pagebreak() }
      page
    }
  } else {
    // set printer page size (typst's page) and a zine page size (pages in the zine)
    set page("us-letter", margin: zine_page_margin, flipped: true)
    let zine_page_height = (8.5in-zine_page_margin)/2 - zine_page_margin;
    let zine_page_width = (11in-zine_page_margin)/4 - zine_page_margin;
    
    let contents = (
      // reorder the pages so the order in the grid aligns with a zine template
      contents.slice(1,5).rev()+contents.slice(5,8)+contents.slice(0,1)
    ).map(
      // wrap the contents in blocks the size of the zine pages so that we can
      // maneuver them at will
      elem => block(
        width: zine_page_width,
        height: zine_page_height,
        spacing: 0em,
        elem
      )
    ).enumerate().map(
      // flip if on top row
      elem => {
        if elem.at(0) < 4 {
          rotate(
            180deg,
            origin: center,
            elem.at(1)
          )
        } else {
          elem.at(1)
        }
      }
    )
  
    let zine_grid = grid.with(
      columns: 4 * (zine_page_width, ),
      rows: zine_page_height,
      gutter: zine_page_margin,
    )
    if draw_border {
      zine_grid = zine_grid.with(
        stroke: luma(0)
      )
    }
    zine_grid(..contents)
  }
}