%% LaTeX2e file `etocsnippet-21-A.tex'
%% generated by the `filecontentshere' environment
%% from source `etoc' on 2020/05/15.
%%
% it will be easy to globally shift the TOC horizontally if needed
\def\TOCleftmargin     {0pt}
\def\TOCrightmargin    {2.55em}% like LaTeX's \@tocrmarg

% this is for dotted leaders
\newbox\TOCleaderbox
\def\TOCleaderboxwidth {0.7777em}% about like what standard classes do

% vertical spacing
\def\TOCverysmallvskip {0pt plus .2pt}
\def\TOCmedvskip       {1em plus 1pt}
\def\TOCbigvskip       {2.25em plus 1pt}

% the ``numwidths'' for typesetting the numbering of division units.
% I don't recall exactly how (and for which fonts) these figures were chosen.
% They quickly prove too small if using Roman numerals (as do too the book
% class defaults even though they are a bit larger).
\def\TOCnumwidthB {1.5em} % chapter
\def\TOCnumwidthC {2.278em}% section, I think default is 2.3em
\def\TOCnumwidthD {3.056em}% analog in standard class is 3.2em
\def\TOCnumwidthE {3.833em}% analog in standard class is 4.1em
\def\TOCnumwidthF {4.611em}% analog in standard class is 5em
\def\TOCnumwidthG {5.389em}% analog in standard class is 6em

% The code for the ``global toc style''.

\newcommand*\TOCglobalstyle {%
\etocsettocstyle
   {\if@twocolumn \@restonecoltrue \onecolumn \else \@restonecolfalse \fi
    \parindent\z@ \leftskip\z@skip \rightskip \z@skip
    \setbox\TOCleaderbox\hbox to \TOCleaderboxwidth{\hss.\hss}%
    \chapter *{\noindent\kern\TOCleftmargin\relax % uses "pt"...
        \contentsname
        \@mkboth {\MakeUppercase \contentsname}{\MakeUppercase \contentsname}}%
    \rightskip    \TOCrightmargin\relax
    \parfillskip -\rightskip % or a smaller value if desired
    \leftskip     \TOCleftmargin \relax }
   {\if@restonecol \twocolumn \fi\cleardoublepage}%
%
\etocsetstyle{part}
 {}
 {\addpenalty {-\@highpenalty}%
  \addvspace \TOCbigvskip
  \leavevmode
   {\large \bfseries % use a group to limit font change
      \interlinepenalty\@M
      \etocifnumbered{\etocnumber\hspace{1em}}{}%
      \etocname
      \nobreak\hfil\makebox[-\parfillskip][r]{\etocpage}}\par
  \nobreak
  }
 {}
 {}%
%
\etocsetstyle{chapter}
 {\advance\leftskip\TOCnumwidthB\relax}
 {\addpenalty {-\@highpenalty }%
  \vskip \TOCmedvskip\relax
  \leavevmode
  {\interlinepenalty\@M
   \etocifnumbered
      {\llap{\makebox[\TOCnumwidthB][l]{\bfseries\etocnumber}}}
      {\advance\leftskip-\TOCnumwidthB\relax}%
   \bfseries\etocname
      \nobreak\hfil\makebox[-\parfillskip][r]{\etocpage}\par }%
  \penalty \@highpenalty
  }
 {}
 {\advance\leftskip-\TOCnumwidthB\relax}%
%
 \TOCsetlinestyle {section}      {\TOCnumwidthC}%
 \TOCsetlinestyle {subsection}   {\TOCnumwidthD}%
 \TOCsetlinestyle {subsubsection}{\TOCnumwidthE}%
 \TOCsetlinestyle {paragraph}    {\TOCnumwidthF}%
 \TOCsetlinestyle {subparagraph} {\TOCnumwidthG}%
}% end of \TOCglobalstyle

%The common code for line styles is abstracted into a macro:

\newcommand\TOCsetlinestyle [2]{% #1= unit, #2= numwidth as macro
\etocsetstyle{#1}
 {\advance\leftskip#2\relax}
 {\vskip \TOCverysmallvskip\relax
  \leavevmode
  {\interlinepenalty\@M
   \etocifnumbered
     {\llap{\makebox[#2][l]{\etocnumber}}}{\advance\leftskip-#2\relax}%
   \etocname
   \nobreak\leaders \copy\TOCleaderbox
   \hfil\makebox[-\parfillskip][r]{\etocpage}%
   \par }%
 }
 {}
 {\advance\leftskip-#2\relax}%
}
\makeatother
