-- pagebreak.lua
-- Converts explicit page break markers into format-specific page breaks.

local DOCX_PAGEBREAK = [[
<w:p>
  <w:r>
    <w:br w:type="page"/>
  </w:r>
</w:p>
]]

local HTML_PAGEBREAK = '<div style="page-break-before: always;"></div>'

local function is_pagebreak(el)
  return (
    (el.t == "RawBlock" and el.format == "tex" and (el.text == "\\newpage" or el.text == "\\pagebreak")) or
    (el.t == "Para" and #el.content == 1 and el.content[1].t == "Str" and el.content[1].text == "\f")
  )
end

function RawBlock(el)
  if el.format == "tex" and (el.text == "\\newpage" or el.text == "\\pagebreak") then
    if FORMAT == "docx" or FORMAT == "openxml" then
      return pandoc.RawBlock("openxml", DOCX_PAGEBREAK)
    elseif FORMAT == "epub" or FORMAT == "epub3" or FORMAT == "html" or FORMAT == "html5" then
      return pandoc.RawBlock("html", HTML_PAGEBREAK)
    end
  end
end

function Para(el)
  if is_pagebreak(el) then
    if FORMAT == "docx" or FORMAT == "openxml" then
      return pandoc.RawBlock("openxml", DOCX_PAGEBREAK)
    elseif FORMAT == "epub" or FORMAT == "epub3" or FORMAT == "html" or FORMAT == "html5" then
      return pandoc.RawBlock("html", HTML_PAGEBREAK)
    end
  end
end