Attempting to recreate the 'TOC as a TikZ mind map'

Question

I'm attempting to recreate the 'TOC as a TikZ mind map' as featured on p.47 of Jean-Francois Burnol's "The etoc package" but I cannot resolve the error that occurs on line 115:

(\centeredline{\resizebox{.85\paperwidth}{!}%)

of the following MWE:

\documentclass[12pt,oneside, tikz, ignorerest=false]{standalone}
\usepackage{tikz}
\usetikzlibrary{mindmap}
\pagestyle{empty}
\usepackage{etoc}
\def\input@path{{/usr/local/texlive/2022/texmf-dist/tex/latex/centeredline/}}
\usepackage{centeredline}
\newcounter{visibletoc}
\renewcommand{\etocaftertitlehook}
   {\stepcounter{visibletoc}\etoctoccontentsline{visibletoc}{\thevisibletoc}}
\etocsetlevel{visibletoc}{6}
\begin{document}
\subsection{Surprising uses of etoc}
\begingroup
% \newtoks\treetok % done in preamble
% \newtoks\parttok
\newcommand\partnode {}  % just to check we don’t overwrite something
\newcommand\childnode {}
\newcommand\tmprotate {} % just to check we don’t overwrite something
\newcommand\tmpoption {} % just to check we don’t overwrite something
\newcommand*\tmpstuff  {} % just to check we don’t overwrite something
\newcommand*\appendtotok[2]{% #1=toks variable, #2=macro, expands once #2
#1\expandafter\expandafter\expandafter{\expandafter\the\expandafter #1#2}}
\newcommand*{\appendchildtree}[3]{%
% this is to construct "t1 child [#3]{t2}" from #1=t1 and #2=t2
% t1 and t2 are two toks variable (not macros)
% #3 = for example teal!60
\edef\tmpstuff {\the#1 child [#3]{\the#2}}%
#1\expandafter {\tmpstuff }%
}
\newcounter{partco}
% 1,2,3,4,5,... -> 1,2,3,1,2,3,1,2,3
\def\pseudomodthree #1{\numexpr #1 + 3 - 3*((#1+1)/3)\relax}
\etocsetstyle{part}
{\etocskipfirstprefix}
% This updates the global tree with the data  from the previous
%  part and all its children sections. Moved here because for some parts the
%  sections are not displayed due to depth tags.
{\ifnum\value{partco}=3
\appendchildtree\treetok\parttok {branch color= green!50,level distance=10cm}%
\else
\ifcase\pseudomodthree{\value{partco}}%
\or \appendchildtree\treetok\parttok {branch color= teal!60}% first
\or \appendchildtree\treetok\parttok {branch color= yellow!80}% second
\else\appendchildtree\treetok\parttok {branch color= green!50}% third and next ...
\fi\fi
}
{\stepcounter{partco}%
% customize manually some TikZ set-up (should be done inside the TikZ thing I guess)
\def\tmpoption {}%
\def\tmprotate {}% first
%\ifnum\value{partco}=5 \def\tmprotate {[counterclockwise from =-40]}\fi
%\ifnum\value{partco}=8 \def\tmprotate {[counterclockwise from =-50]}\fi
% define the part node
 \edef\partnode{node \tmpoption
{\unexpanded\expandafter{\etocthelinkednumber}.
 \unexpanded\expandafter{\etocthelinkedname}}\tmprotate }%
% this is a starting point which will be filled it by the section children
 \parttok\expandafter{\partnode}}
{\ifcase\pseudomodthree{\value{partco}}%
\or \appendchildtree\treetok\parttok {branch color= teal!60}% first
\or \appendchildtree\treetok\parttok {branch color= yellow!80}% second 
\else\appendchildtree\treetok\parttok {branch color= green!50}% third and next ...
\fi
}
\etocsetstyle{section}
{}
{}
{% define the section node
 \edef\childnode{child {node {\unexpanded\expandafter{\etocthelinkednumber}
\unexpanded\expandafter{\etocthelinkedname}}}}%
 % append it to the current \parttok
 \appendtotok\parttok\childnode
}
{}
\etocsettocstyle
{\setcounter{partco}{0}%
 \treetok{\node [root concept]{\textbf{The \etoc documentation}}}}
{\global\appendtotok\treetok{ ;}}
% The \global above is mandatory because etoc always typesets TOC inside a group
\etocsetnexttocdepth{section}
% use of depth tags to cut out some sections.
\etocsettagdepth {preamble}   {none}
\etocsettagdepth {overview}   {part}
\etocsettagdepth {arbitrarily} {part}
\etocsettagdepth {examples}   {section}
\etocsettagdepth {surprising}  {part}
\etocsettagdepth {linestyles}  {part}
\etocsettagdepth {globalcmds}  {part}
\etocsettagdepth {custom}     {section}
\etocsettagdepth {tips}       {part}
\etocsettagdepth {etocandworld}{part}
\etocsettagdepth {code}       {section}
\tikzset{
branch color/.style={
concept color=#1!white,
every child/.append style={concept color=#1!white!30!white, font=\normalsize},
}
}%
\begin{figure}[thp!]
\tableofcontents\label{toc:mindmap}%
\centeredline{\resizebox{.85\paperwidth}{!}%
{\begin{tikzpicture}[mindmap,
grow cyclic,
text width=2cm,
align=flush center,
nodes={concept},
concept color=orange!60,
root concept/.append style={text width=4cm, font=\Large},
level 1/.append style={level distance=5cm,sibling angle=40, text width=3cm},
level 2/.append style={level distance=7cm,sibling angle=30, text width=3cm},
level 1 concept/.append style={font=\normalsize},
]
\the\treetok
\end{tikzpicture}}}
\end{figure}
\endgroup

The MWE is a combination of code taken from pgs. 46-49 of "The etoc package", along with setup code for the Preamble from user4686's 2015 answer to an issue in the SE post Visual table of contents (tikz mindmap) - Problem in output.

I also added the following code in an attempt to deal with an issue that occurrs when loading the 'centeredline' package, e.g. '\usepackage{centeredline}':

\def\input@path{{/usr/local/texlive/2022/texmf-dist/tex/latex/centeredline/}}

to eliminate a warning that occurred when compiled.

Any thoughts on what I am missing would be greatly appreciated.

Answer 1

Don't use the standalone class if you want contents and such. You don't need to define \input@path and I'm not sure what doing so is meant to do.

The code you're using assumes the use of \part, so you need to use parts to get sections etc. to show up. That is, the section code is appended to the part code for the tree. If there is no part node, the section nodes are never used. I've also added some subsections, just to show they are ignored as specified, and deleted some lines which aren't needed for your example.

\documentclass[12pt,oneside, tikz, ignorerest=false]{article}
\usepackage{tikz}
\usetikzlibrary{mindmap}
\pagestyle{empty}
\usepackage{etoc}
\usepackage{centeredline}
\begin{document}
\part{Part Level}
If we're appending to \verb|\parttok| we need a part to avoid losing it.
\section{Section level}
\subsection{Surprising uses of etoc}
\begingroup
  \newtoks\treetok % done in preamble
  \newtoks\parttok
  \newcommand*\partnode {}  % just to check we don’t overwrite something
  \newcommand*\childnode {}
\newcommand\tmprotate {} % just to check we don’t overwrite something
  \newcommand\tmpoption {} % just to check we don’t overwrite something
  \newcommand*\tmpstuff  {} % just to check we don’t overwrite something
\newcommand*\appendtotok[2]{% #1=toks variable, #2=macro, expands once #2
    #1\expandafter\expandafter\expandafter{\expandafter\the\expandafter #1#2}}
\newcommand*{\appendchildtree}[3]{%
    % this is to construct "t1 child [#3]{t2}" from #1=t1 and #2=t2
    % t1 and t2 are two toks variable (not macros)
    % #3 = for example teal!60
    \edef\tmpstuff {\the#1 child [#3]{\the#2}}%
    #1\expandafter {\tmpstuff }%
  }
\newcounter{partco}
% 1,2,3,4,5,... -> 1,2,3,1,2,3,1,2,3
  \def\pseudomodthree #1{\numexpr #1 + 3 - 3*((#1+1)/3)\relax}
\etocsetstyle{part}
  {\etocskipfirstprefix}
  % This updates the global tree with the data  from the previous
  %  part and all its children sections. Moved here because for some parts the
  %  sections are not displayed due to depth tags.
  {\ifnum\value{partco}=3
    \appendchildtree\treetok\parttok {branch color= green!50,level distance=10cm}%
    \else
    \ifcase\pseudomodthree{\value{partco}}%
    \or \appendchildtree\treetok\parttok {branch color= teal!60}% first
    \or \appendchildtree\treetok\parttok {branch color= yellow!80}% second
    \else\appendchildtree\treetok\parttok {branch color= green!50}% third and next ...
    \fi\fi
  }
  {\stepcounter{partco}%
% customize manually some TikZ set-up (should be done inside the TikZ thing I guess)
\def\tmpoption {}%
\def\tmprotate {}% first
%\ifnum\value{partco}=5 \def\tmprotate {[counterclockwise from =-40]}\fi
%\ifnum\value{partco}=8 \def\tmprotate {[counterclockwise from =-50]}\fi
% define the part node
\edef\partnode{node \tmpoption
  {\unexpanded\expandafter{\etocthelinkednumber}.
    \unexpanded\expandafter{\etocthelinkedname}}\tmprotate }%
% this is a starting point which will be filled it by the section children
\parttok\expandafter{\partnode}}

{\ifcase\pseudomodthree{\value{partco}}%
    \or \appendchildtree\treetok\parttok {branch color= teal!60}% first
    \or \appendchildtree\treetok\parttok {branch color= yellow!80}% second 
    \else\appendchildtree\treetok\parttok {branch color= green!50}% third and next ...
    \fi
  }
\etocsetstyle{section}
  {}
  {}
  {% define the section node
    \edef\childnode{child {node {\unexpanded\expandafter{\etocthelinkednumber}
          \unexpanded\expandafter{\etocthelinkedname}}}}%
    % append it to the current \parttok
    \appendtotok\parttok\childnode
  }
  {}
\etocsettocstyle
  {\setcounter{partco}{0}%
    \treetok{\node [root concept]{\textbf{The etoc documentation}}}}
  {\global\appendtotok\treetok{ ;}}
  % The \global above is mandatory because etoc always typesets TOC inside a group
\etocsetnexttocdepth{section}
  \tikzset{
    branch color/.style={
      concept color=#1!white,
      every child/.append style={concept color=#1!white!30!white, font=\normalsize},
    }
  }%
\begin{figure}[thp!]
    \tableofcontents\label{toc:mindmap}%
    \centeredline{\resizebox{.85\paperwidth}{!}%
      {\begin{tikzpicture}[mindmap,
          grow cyclic,
          text width=2cm,
          align=flush center,
          nodes={concept},
          concept color=orange!60,
          root concept/.append style={text width=4cm, font=\Large},
          level 1/.append style={level distance=5cm,sibling angle=40, text width=3cm},
          level 2/.append style={level distance=7cm,sibling angle=30, text width=3cm},
          level 1 concept/.append style={font=\normalsize},
          ]
          \the\treetok
        \end{tikzpicture}}}
  \end{figure}
\endgroup
\subsubsection{Lower by Two}
\subsubsection{Another Lower by Two}
\subsection{A Lower Level}
\section{Another Top Level}
\end{document}