%%
%% The LaTeX Companion, 3ed
%%
%% Example 5-3-4 on page I-394 in "\LaTeX {}'s new mark mechanism".
%%
%% 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.
%%
\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{95.40097pt}
\setlength\textheight{8\baselineskip}
% for the book examples we shorten the vertical spaces
\addtolength\headsep{-12pt} % shortened for the book
\addtolength\footskip{-12pt} % shortened for the book
\raggedright % as these examples are so small
%StartShownPreambleCommands
\NewMarkClass{idxmark}
\usepackage{fancyhdr}
\pagestyle{fancy} \fancyhf{}
\newcommand\combinemarks{%
\IfMarksEqualTF{idxmark}{first}{last}
{\FirstMark{idxmark}}% equal values
{\FirstMark{idxmark}---%
\LastMark{idxmark}}}
\chead{\combinemarks} \cfoot{\thepage}
\newcommand\idxitem[1]{\par\vspace{8pt}%
\textbf{#1}\InsertMark{idxmark}{#1}%
\quad\ignorespaces}
%StopShownPreambleCommands
\begin{document}
\idxitem{galley} Text formatted but not
cut into pages.
\idxitem{OR} Output routine.
\idxitem{mark} An object in the galley
used to communicate with the OR.
\idxitem{running header} page title
changing with page contents.
\end{document}
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