%  Define section numbers with dots
%
% Author: Robin Fairbairns 
%         first version, June 2000
%
%         version 1.0, July 2000, with a contribution from
%         Steve Grathwohl of Duke University
%
%         Version 1.1 May 2026 some support for section templates
%         LaTeX Team.
%         Version 1.2 May 2026 Correct malformed date.
%         LaTeX Team.
%
% This program may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.1
% of this license or (at your option) any later version.
% The latest version of this license is in
%   http://www.latex-project.org/lppl.txt
% and version 1.1 or later is part of all distributions of LaTeX 
% version 1999/06/01 or later.
%
% This program consists of the file secdot.sty
% documentation (such as it is) may be found after \endinput herein

\NeedsTeXFormat{LaTeX2e}%
\ProvidesPackage{secdot}[2026-05-16 v1.2 section numbers with dots]

% command to declare a particular section level to have a dot after
% its number
\newcommand\sectiondot[1]{%
  \expandafter\def\csname @seccntfmt@#1\endcsname##1{%
    \csname the##1\endcsname.\quad
  }
}

% do this by default for \section numbering
\sectiondot{section}

% generalised version: define that #2 comes after section level #1
\newcommand\sectionpunct[2]{%
  \expandafter\def\csname @seccntfmt@#1\endcsname##1{%
    \csname the##1\endcsname#2%
  }%
}

% the guts of the package: insert the dots where needed ... 
\renewcommand\@seccntformat[1]{\@ifundefined{@seccntfmt@#1}%
  {\csname the#1\endcsname\quad}% original default style
  {\csname @seccntfmt@#1\endcsname{#1}}%
}

% Minimal support for section heading instances if \DocumentMetadat
% is used
\ifdefined\IfInstanceExistsT
\IfInstanceExistsT{headformat}{section}{%
\EditInstance{heading}{section}{number-format=\@seccntformat{section}}
\EditInstance{heading}{subsection}{number-format=\@seccntformat{subsection}}
\EditInstance{heading}{subsubsection}{number-format=\@seccntformat{subsubsection}}
\EditInstance{heading}{paragraph}{number-format=\@seccntformat{paragraph}}
\EditInstance{heading}{subparagraph}{number-format=\@seccntformat{subparagraph}}
\EditInstance{headformat}{paragraph}{number-title-sep=0pt}
\EditInstance{headformat}{subparagraph}{number-title-sep=0pt}
\EditInstance{headformat}{section}{number-title-sep=0pt}
\EditInstance{headformat}{subsection}{number-title-sep=0pt}
\EditInstance{headformat}{subsubsection}{number-title-sep=0pt}
}
\fi
\endinput

secdot.sty: section numbers with dots
=====================================

The package as loaded causes section numbers to be output with a dot
after them.

The command \sectiondot{<level>} will make `level' sections also be
output with a dot after them -- an example of use would be:
   \sectiondot{subsection}

The command \sectionpunct{<level>}{<punctuation>} gives finer
control.  examples of use would be
   \sectionpunct{section}{. } % \sectiondot places a \quad after the
                              % dot, which may look excessive
   \sectionpunct{section}{\quad} % restores default latex behaviour

Other eccentricities of numbering could be coded by those with
stronger stomachs, by defining the appropriate

   \csname @seccntfmt@<level>\endcsname

which macro will take one argument, when invoked: the `level' name

If \DocumentDocumentMetadata is used, section headings are
implemented via LaTeX templates which offer much more flexible
customisation, and this package is not recommended for new documents.
However, a basic set of \EditInstance declarations are included
in this package so that the basic functionality still works in
combination with \DocumentDocumentMetadata.