[luatex] LuaLaTeX example: show hyphenation points

[Patrick Gundlach]

Hi,

inspired by Paul Isambert's very nice article in the last MAPS(1) and also in tugboat 31:3 (2) I'd like to post a LaTeX/LuaTeX example. It shows all the hyphenation points of a text. It's also wikified at http://wiki.luatex.org/index.php/Show_the_hyphenation_points

Please correct any errors at the wiki page, thanks!

Patrick

1: http://ntg.nl/english.html
2: http://tug.org/TUGboat/Contents/contents31-3.html

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\documentclass[12pt,a4paper]{scrartcl}
\usepackage[english]{babel}
\usepackage{blindtext}
\usepackage{fontspec}
\directlua{
show_hyph = function(head)
  while head do
    if head.id == 0 or head.id == 1 then % hlist, vlist
      show_hyph(head.list) % should be head.head in a newer luatex than 0.64
    elseif head.id == 7 then             % disc
      local n = node.new("whatsit","pdf_literal")
      n.mode = 0
      n.data = "q 0.3 w 0 2 m 0 7 l S Q"
      n.next = head.next
      n.prev = head
      head.next = n
      head = n
    end
  head = head.next
  end
  return true
end
luatexbase.add_to_callback("post_linebreak_filter",show_hyph,"show_hyph")

}

\begin{document}
\begin{minipage}{5cm}
\blindtext
\end{minipage}
\end{document}
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