% chet.sty (version 2.3a)
% Copyright 2026 Andreas Stergiou
%
% This package is supposed to streamline latex typesetting and give the
% look and feel of harvmac to a paper, with the use of LaTex2e.
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3
% 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 1.3 or later is part of all distributions of LaTeX
% version 2005/12/01 or later.

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{chet}[2026/04/26 v2.3a chet style]

\RequirePackage{kvoptions}
\RequirePackage{xparse}
\RequirePackage{xspace}

\SetupKeyvalOptions{%
  family=Chet,
  prefix=Chet@}

\DeclareBoolOption{macrosonly}
\DeclareBoolOption{british}
\DeclareBoolOption{mcite}

\ProcessKeyvalOptions*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\RequirePackage{amsmath}

\ifChet@macrosonly

\newcommand{\rcite}{\cite}
\newcommand{\draftmode}{\RequirePackage[notref,notcite]{showkeys}}
\providecommand*\showkeyslabelformat[1]{\normalfont\sffamily\footnotesize#1}
\newcommand{\foot}{\footnote}

\else

\RequirePackage{datetime}
\RequirePackage[labelsep=colon,labelfont=bf]{caption}
\RequirePackage{tocloft}
\RequirePackage{cite}
\ifChet@mcite
  \RequirePackage{mciteplus} 
\fi
\RequirePackage{color}
\RequirePackage[nopatch=footnote]{microtype}
\RequirePackage[para]{manyfoot}
\RequirePackage[bottom]{footmisc}
\RequirePackage[left=2.5cm,right=2.5cm,top=2.5cm,bottom=3cm]{geometry}
\RequirePackage[linktocpage]{hyperref}

\numberwithin{equation}{section}

\newcommand{\rcite}{\cite}
\newcommand{\rcitedraft}[1]{\cite{#1}\textsuperscript{\textsf{#1}}}
\newcommand{\draftmode}{%
  \RequirePackage[notref,notcite]{showkeys}%
  \renewcommand{\rcite}{\rcitedraft}%
  \overfullrule=8pt%
}
\providecommand*\showkeyslabelformat[1]{\normalfont\sffamily\footnotesize#1}

% Table of contents formatting
\setcounter{tocdepth}{3}
\renewcommand{\cfttoctitlefont}{\bfseries}
\renewcommand{\cftsecaftersnum}{.}
\renewcommand{\cftsubsecaftersnum}{.}
\renewcommand{\cftsubsubsecaftersnum}{.}
\renewcommand{\cftdotsep}{8}
\newcommand{\toc}{\tableofcontents}
\renewcommand\contentsname{\centerline{Contents}}

% Acknowledgments
\ifChet@british
  \newenvironment{acknowledgments}{\par\vspace{12pt}{\centering\textbf{Acknowledgements}\par}\nobreak\vspace{0pt}}{}
\else
  \newenvironment{acknowledgments}{\par\vspace{12pt}{\centering\textbf{Acknowledgments}\par}\nobreak\vspace{0pt}}{}
\fi
\newcommand{\ack}[1]{\begin{acknowledgments}{\noindent #1}\end{acknowledgments}}

% References
\renewcommand\refname{\bfseries\normalsize\centering References\\ \vspace{-0.4cm}%
\addcontentsline{toc}{section}{References}}
\bibliographystyle{chetref}

% Footnotes
\newcommand{\foot}{\footnote}
\setlength{\skip\footins}{0.5cm}
\setlength{\footnotesep}{0.4cm}

% Horizontal spacing between words
\fontdimen2\font=1.2\fontdimen2\font

% Vertical spacing between lines
\linespread{1.25}

% Vertical spacing in multiline equations (align, gather, ...)
\setlength{\jot}{5pt}

% Figure name
\renewcommand{\figurename}{Fig.}

% Format of date in bottom left of title page
\newdateformat{mydate}{\monthname[\THEMONTH] \THEYEAR}
\mydate{}

% Appendices
\newcommand\appendix@section{\@ifstar\appendix@section@star\appendix@section@nostar}
\newcommand\appendix@section@nostar[1]{%
  \refstepcounter{section}%
  \orig@section*{Appendix~\@Alph\c@section.~#1}%
  \addcontentsline{toc}{section}{Appendix~\@Alph\c@section.~#1}}
\newcommand\appendix@section@star[1]{%
  \orig@section*{#1}}
\renewcommand{\appendix}{%
  \par
  \setcounter{section}{0}%
  \setcounter{subsection}{0}%
  \gdef\thesection{\@Alph\c@section}%
  \let\section\appendix@section}
\newcommand{\appendices}{\appendix}

% Footnotes for emails in titlepage
% Horizontal emails
\SetFootnoteHook{\noindent\hspace{-5pt}}
\DeclareNewFootnote[para]{E}[roman]
\newcommand{\email}[1]{\footnoteE{\href{mailto:#1}{\texttt{#1}}}}
% Vertical emails
\SetFootnoteHook{\noindent\hspace{-10pt}}
\DeclareNewFootnote{EE}[roman]
\newcommand{\emailV}[1]{\footnoteEE{\href{mailto:#1}{\texttt{#1}}}}
% All emails together
\SetFootnoteHook{\noindent}
\DeclareNewFootnote[para]{EEE}[roman]
\newcommand{\emails}[1]{\footnotetextEEE{\texttt{#1}}}

% Titlepage
\renewcommand{\abstract}[1]{\def\@abstract{#1}}
\newcommand{\affiliation}[1]{\def\@affiliation{#1}}
\newcommand{\preprint}[1]{\def\@preprint{#1}}
\abstract{}
\affiliation{}
\preprint{}

% Title font (scaled cmr10)
\DeclareFontShape{T1}{cmr}{x}{n}%
    {<->cmr10}{}
\newcommand{\mytitlefont}{\fontseries{x}\selectfont}
% Command for use with math in title $\titlemath{...}$
\DeclareMathAlphabet{\titlemath}{T1}{cmr}{x}{n}

\def\maketitle{%
  \begin{titlepage}
    \begin{flushright}
      \@preprint
    \end{flushright}
    \vspace{2cm}
    \begin{center}
      {\huge\mytitlefont\@title}

      \bigskip\bigskip\bigskip

      \@author

      \bigskip

      {\emph\@affiliation}
    \end{center}
    \bigskip\bigskip
    \noindent\@abstract
    \vfill
    \noindent\@date
  \end{titlepage}
}

\renewcommand\section{\@startsection{section}{1}{\z@}%
  {-6ex \@plus -1ex \@minus -.2ex}%
  {2.3ex \@plus.2ex}%
  {\bfseries}}
\let\orig@section\section
\renewcommand\subsection{\@startsection{subsection}{2}{\z@}%
  {-3.25ex\@plus -1ex \@minus -.2ex}%
  {1.5ex \@plus .2ex}%
  {\itshape}}
\renewcommand\subsubsection{\@startsection{subsubsection}{3}{\z@}%
  {-3.25ex\@plus -1ex \@minus -.2ex}%
  {1.5ex \@plus .2ex}%
  {\itshape}}

% Dot after section number
\def\@seccntformat#1{\csname the#1\endcsname.\hspace{4.6pt}}

\fi

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% Numbered equation with optional label
\NewDocumentCommand\eqn{mo}{%
  \IfNoValueTF{#2}
    {\[ #1 \]}
    {\begin{equation}\label{#2} #1 \end{equation}%
     \expandafter\def\csname #2\endcsname{\eqref{#2}\xspace}\ignorespaces}
}

% Numbered aligned equation with optional label in the vertical middle
\NewDocumentCommand\eqna{mo}{%
  \IfNoValueTF{#2}
    {\begin{align*} #1 \end{align*}}
    {\begin{equation}\label{#2}\begin{split} #1 \end{split}\end{equation}%
     \expandafter\def\csname #2\endcsname{\eqref{#2}\xspace}\ignorespaces}
}

% Numbered subequations
% Two subequations
\NewDocumentCommand\twoseqn{momoo}{%
  \IfNoValueTF{#5}
    {\begin{subequations}%
       \begin{align} #1\label{#2} \\ #3\label{#4} \end{align}%
     \end{subequations}%
     \expandafter\def\csname #2\endcsname{\eqref{#2}\xspace}\ignorespaces
     \expandafter\def\csname #4\endcsname{\eqref{#4}\xspace}\ignorespaces}
    {\begin{subequations}\label{#5}%
       \begin{align} #1\label{#2} \\ #3\label{#4} \end{align}%
     \end{subequations}%
     \expandafter\def\csname #5\endcsname{\eqref{#5}\xspace}\ignorespaces
     \expandafter\def\csname #2\endcsname{\eqref{#2}\xspace}\ignorespaces
     \expandafter\def\csname #4\endcsname{\eqref{#4}\xspace}\ignorespaces}
}

% Three subequations
\NewDocumentCommand\threeseqn{momomoo}{%
  \IfNoValueTF{#7}
    {\begin{subequations}%
       \begin{align} #1\label{#2} \\ #3\label{#4} \\ #5\label{#6} \end{align}%
     \end{subequations}%
     \expandafter\def\csname #2\endcsname{\eqref{#2}\xspace}\ignorespaces
     \expandafter\def\csname #4\endcsname{\eqref{#4}\xspace}\ignorespaces
     \expandafter\def\csname #6\endcsname{\eqref{#6}\xspace}\ignorespaces}
    {\begin{subequations}\label{#7}%
       \begin{align} #1\label{#2} \\ #3\label{#4} \\ #5\label{#6} \end{align}%
     \end{subequations}%
     \expandafter\def\csname #7\endcsname{\eqref{#7}\xspace}\ignorespaces
     \expandafter\def\csname #2\endcsname{\eqref{#2}\xspace}\ignorespaces
     \expandafter\def\csname #4\endcsname{\eqref{#4}\xspace}\ignorespaces
     \expandafter\def\csname #6\endcsname{\eqref{#6}\xspace}\ignorespaces}
}

% Four subequations
\NewDocumentCommand\fourseqn{momomomoo}{%
  \IfNoValueTF{#9}
    {\begin{subequations}%
       \begin{align} #1\label{#2} \\ #3\label{#4} \\ #5\label{#6} \\ #7\label{#8} \end{align}%
     \end{subequations}%
     \expandafter\def\csname #2\endcsname{\eqref{#2}\xspace}\ignorespaces
     \expandafter\def\csname #4\endcsname{\eqref{#4}\xspace}\ignorespaces
     \expandafter\def\csname #6\endcsname{\eqref{#6}\xspace}\ignorespaces
     \expandafter\def\csname #8\endcsname{\eqref{#8}\xspace}\ignorespaces}
    {\begin{subequations}\label{#9}%
       \begin{align} #1\label{#2} \\ #3\label{#4} \\ #5\label{#6} \\ #7\label{#8} \end{align}%
     \end{subequations}%
     \expandafter\def\csname #9\endcsname{\eqref{#9}\xspace}\ignorespaces
     \expandafter\def\csname #2\endcsname{\eqref{#2}\xspace}\ignorespaces
     \expandafter\def\csname #4\endcsname{\eqref{#4}\xspace}\ignorespaces
     \expandafter\def\csname #6\endcsname{\eqref{#6}\xspace}\ignorespaces
     \expandafter\def\csname #8\endcsname{\eqref{#8}\xspace}\ignorespaces}
}

% Sections and subsections
\NewDocumentCommand\newsec{mo}{%
  \IfNoValueTF{#2}
    {\section{#1}}
    {\section{#1}\label{#2}%
     \expandafter\gdef\csname #2\endcsname{\ref{#2}\xspace}\ignorespaces}
}
\NewDocumentCommand\subsec{mo}{%
  \IfNoValueTF{#2}
    {\subsection{#1}}
    {\subsection{#1}\label{#2}%
     \expandafter\gdef\csname #2\endcsname{\ref{#2}\xspace}\ignorespaces}
}
\NewDocumentCommand\subsubsec{mo}{%
  \IfNoValueTF{#2}
    {\subsubsection{#1}}
    {\subsubsection{#1}\label{#2}%
     \expandafter\gdef\csname #2\endcsname{\ref{#2}\xspace}\ignorespaces}
}

\endinput
%