class Typst::Png

def initialize(input, root: ".", font_paths: [], sys_inputs: {})
  super(input, root: root, font_paths: font_paths, sys_inputs: sys_inputs)
  @pages = Typst::_to_png(self.input, self.root, self.font_paths, File.dirname(__FILE__), false, sys_inputs).collect{ |page| page.pack("C*").to_s }
end

def write(output)
  if pages.size > 1
    pages.each_with_index do |page, i|
      if output.include?("{{n}}")
        file_name = output.gsub("{{n}}", (i+1).to_s)
      else
        file_name = File.basename(output, File.extname(output)) + "_" + i.to_s
        file_name = file_name + File.extname(output)
      end
      File.open(file_name, "w"){ |f| f.write(page) }
    end
  elsif pages.size == 1
    File.open(output, "w"){ |f| f.write(pages[0]) }
  else
  end
end