如果没有图，删除单词章节

Question

如果没有图形，并且每个章节都有颜色，我想从 LOF 中删除单词章节，表格也一样。

    \documentclass{memoir}

\usepackage{lipsum}
\usepackage{etoolbox}

\renewcommand*{\insertchapterspace}{%
  \addtocontents{lof}{\protect\addvspace{10pt}}%
  \addtocontents{lot}{\protect\addvspace{10pt}}
  \addtocontents{lof}{\protect\lofchapter{\thechapter}}%
  \addtocontents{lot}{\protect\lofchapter{\thechapter}}%
}

\newcommand{\lofchapter}[1]{%
  \noindent
  \rule[.5ex]{.4\linewidth}{.2ex}\hfill
  \textsc{Chapter #1}\hfill
  \rule[.5ex]{.4\linewidth}{.2ex}\par
  \nobreak
}

\newcommand{\lotchapter}[1]{%
  \noindent
  \rule[.5ex]{.4\linewidth}{.2ex}\hfill
  \textsc{Chapter #1}\hfill
  \rule[.5ex]{.4\linewidth}{.2ex}\par
  \nobreak
}


\renewcommand*{\cftfigurename}{Figure\space} %<<<<<<<<<<<<<<<<<<<<

\renewcommand*{\cfttablename}{Table\space} %<<<<<<<<<<<<<<<<<<<<


\begin{document}

\sloppy% Just for this example

\listoffigures
\listoftables
\chapter{First chapter}
\lipsum[1-10]\begin{figure}\caption{First figure}\end{figure}
\begin{table}\caption{First figure}\end{table}
\lipsum[11-20]\begin{figure}\caption{Second figure}\end{figure}
\lipsum[21-30]\begin{figure}\caption{Third figure}\end{figure}
\lipsum[31-40]\begin{figure}\caption{Last figure}\end{figure}
\lipsum[41-50]

\chapter{Second chapter}
\lipsum[1-10]\begin{figure}\caption{First figure}\end{figure}
\lipsum[11-20]\begin{figure}\caption{Second figure}\end{figure}
\lipsum[21-30]\begin{figure}\caption{Third figure}\end{figure}
\lipsum[31-40]\begin{figure}\caption{Last figure}\end{figure}
\lipsum[41-50]

\chapter{Third chapter}


\chapter{Last chapter}
\lipsum[1-10]\begin{figure}\caption{First figure}\end{figure}
\lipsum[11-20]\begin{figure}\caption{Second figure}\end{figure}
\lipsum[21-30]\begin{figure}\caption{Third figure}\end{figure}
\lipsum[31-40]\begin{figure}\caption{Last figure}\end{figure}
\lipsum[41-50]

\end{document}

Answer 1

这会将每章的图表总数存储在辅助文件中，但需要\savetotal在每章结束时运行。您可以修改\chapter并使用\AtEndDocument，但那将是“懒人的负担”。

首先你需要构造一个颜色列表。最简单的方法是使用\ifcase（参见 Knuth电子书第210页）。

\documentclass{memoir}
\usepackage{xcolor}
\usepackage{lipsum}
\usepackage{etoolbox}

\newcommand{\colorlist}[1]% list index 0,1,...
  {\ifcase#1\relax black\or blue\or red\or green\or yellow\or orange\or purple\else black\fi}% no space after color
  
\newcommand{\chaptercolor}{black}% reserve global name

\makeatletter
\newcommand{\savetotal}{\protected@write {\@auxout}{}{\string\xdef\string\totalfigures\roman{chapter}{\arabic{figure}}}%
  \protected@write {\@auxout}{}{\string\xdef\string\totaltables\roman{chapter}{\arabic{table}}}}
  
\renewcommand*{\insertchapterspace}{\bgroup
  \@ifundefined{totalfigures\roman{chapter}}{%
    \addtocontents{lof}{\protect\addvspace{10pt}}%
    \addtocontents{lof}{\protect\lofchapter{\thechapter}}%
  }{\count1=\csname totalfigures\roman{chapter}\endcsname\relax
  \the\count1
    \ifnum\count1>0
      \addtocontents{lof}{\protect\addvspace{10pt}}%
      \addtocontents{lof}{\protect\lofchapter{\thechapter}}%
    \fi}
  \@ifundefined{totaltables\roman{chapter}}{%
    \addtocontents{lot}{\protect\addvspace{10pt}}
    \addtocontents{lot}{\protect\lotchapter{\thechapter}}%
  }{\count1=\csname totaltables\roman{chapter}\endcsname\relax
    \ifnum\count1>0
      \addtocontents{lot}{\protect\addvspace{10pt}}
      \addtocontents{lot}{\protect\lotchapter{\thechapter}}%
  }%
\egroup}
\makeatother

\newcommand{\lofchapter}[1]{%
  \xdef\chaptercolor{\colorlist#1}% see \cftfigurename
  \noindent\textcolor{\chaptercolor}{%
  \rule[.5ex]{.4\linewidth}{.2ex}\hfill
  \textsc{Chapter #1}\hfill
  \rule[.5ex]{.4\linewidth}{.2ex}}%
}

\newcommand{\lotchapter}[1]{%
\xdef\chaptercolor{\colorlist#1}% see \cfttablename
  \noindent\textcolor{\chaptercolor}{%
  \rule[.5ex]{.4\linewidth}{.2ex}\hfill
  \textsc{Chapter #1}\hfill
  \rule[.5ex]{.4\linewidth}{.2ex}}
}


\renewcommand*{\cftfigurename}{\textcolor{\chaptercolor}{Figure\space}}%<<<<<<<<<<<<<<<<<<<<

\renewcommand*{\cfttablename}{\textcolor{\chaptercolor}{Table\space}} %<<<<<<<<<<<<<<<<<<<<

\begin{document}

\sloppy% Just for this example

\listoffigures
\listoftables
\chapter{First chapter}
\lipsum[1-10]\begin{figure}\caption{First figure}\end{figure}
\begin{table}\caption{First table}\end{table}
\lipsum[11-20]\begin{figure}\caption{Second figure}\end{figure}
\lipsum[21-30]\begin{figure}\caption{Third figure}\end{figure}
\lipsum[31-40]\begin{figure}\caption{Last figure}\end{figure}
\lipsum[41-50]
\savetotal

\chapter{Second chapter}
\lipsum[1-10]\begin{figure}\caption{First figure}\end{figure}
\lipsum[11-20]\begin{figure}\caption{Second figure}\end{figure}
\lipsum[21-30]\begin{figure}\caption{Third figure}\end{figure}
\lipsum[31-40]\begin{figure}\caption{Last figure}\end{figure}
\lipsum[41-50]
\savetotal

\chapter{Third chapter}

\savetotal
\chapter{Last chapter}
\lipsum[1-10]\begin{figure}\caption{First figure}\end{figure}
\lipsum[11-20]\begin{figure}\caption{Second figure}\end{figure}
\lipsum[21-30]\begin{figure}\caption{Third figure}\end{figure}
\lipsum[31-40]\begin{figure}\caption{Last figure}\end{figure}
\lipsum[41-50]
\savetotal
\end{document}