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+%% 
+%%  Ein Beispiel der DANTE-Edition
+%%  
+%%  1. Auflage
+%% 
+%%  Beispiel 04-01-3 auf Seite 72.
+%% 
+%%  Copyright (C) 2013 Herbert Voss
+%% 
+%%  It may be distributed and/or modified under the conditions
+%%  of the LaTeX Project Public License, either version 1.3
+%%  of this license or (at your option) any later version.
+%% 
+%%  See http://www.latex-project.org/lppl.txt for details.
+%% 
+%% 
+%% ==== 
+% Show page(s) 1
+%% 
+%% 
+\documentclass[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{352.81416pt}
+\setlength\parindent{0pt}
+%StartShownPreambleCommands
+\usepackage{luacode,fontspec}
+\begin{luacode}
+  function listCallbacks()
+    local n=4  -- Spaltenzahl der Tabelle
+    tex.print("\\footnotesize\\begin{tabular}{@{} *" .. n .. "l @{}}")
+    local i=0
+    info=callback.list()
+    for k in pairs(info) do
+      if info[k] then
+        tex.sprint("\\verb|" .. k .. "|")
+        i=i+1
+        if i==n then tex.print("\\\\") i=0 else tex.print(" & ") end
+      end
+    end
+    tex.print("\\end{tabular}")
+  end
+\end{luacode}
+%StopShownPreambleCommands
+\begin{document}
+\directlua{listCallbacks()}
+\end{document}