%%
%% The LaTeX Companion, 3ed
%%
%% Example B-4-2 on page II-775 in "showhyphenation, lua-check-hyphen --- Display hyphenation points with \hologoRobust {LuaTeX}".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

%Next line to access new features, see Chapter 2:
\DocumentMetadata {uncompress}

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{189.0pt}

  % use lualatex for processing

  % Special processing for the book (which uses spotcolor)
  % it requires an adjusted .lua file and should be removed
  % for normal processing!

  \ExplSyntaxOn
    \color_model_new:nnn { ink-pantone } { Separation }
      {
        name = PANTONE~3005~U , %ink
        alternative-model = cmyk ,
        alternative-values = {1, 0.56, 0, 0} %fallback
      }
    \color_set:nnn{spot}{ink-pantone}{1}
  \ExplSyntaxOff


%StartShownPreambleCommands
\usepackage{showhyphenation}
\usepackage{lua-check-hyphen}
%StopShownPreambleCommands

\begin{document}
This short paragraph demonstrates the usefulness
of the  packages \textsf{showhyphenation} and
\textsf{check-lua-hyphens}. The first
automatically marks all hyphenation points found
by the engine with a small triangular mark. The
second package writes out all hyphenations that
happened in the document into a file with the
extension \texttt{.uhy}. You can then examine
that file to find any issues with the
hyphenation and correct them as necessary.
\end{document}