lix.sty

% Auth: Nicklas Vraa
% Docs: https://github.com/NicklasVraa/LiX
%
% DESC: A meta-package which bundles other LaTeX packages and commands. To use
% these bundles, simply specify them when importing the LiX package, either in
% your own document-class, or directly in your main document when using a
% predefined class. The goal of this package is to speed up writing your
% documents, but also to simplify the process of defining your own class.
% ------------------------------------------------------------------------------

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{lix}[2023/02/10 Meta-package for easy writing]

% SWITCHES: --------------------------------------------------------------------
\newcommand{\useAlgorithms}{0}
\newcommand{\useBasics}{0}
\newcommand{\useCode}{0}
\newcommand{\useCover}{0}
\newcommand{\useFigures}{0}
\newcommand{\useFormatting}{0}
\newcommand{\useHeader}{0}
\newcommand{\useHeadings}{0}
\newcommand{\useIsbn}{0}
\newcommand{\useLicense}{1}
\newcommand{\useLists}{0}
\newcommand{\useMath}{0}
\newcommand{\useMetadata}{0}
\newcommand{\usePeriodical}{0}
\newcommand{\usePublish}{0}
\newcommand{\useRefs}{0}
\newcommand{\useSign}{0}
\newcommand{\useSize}{0}
\newcommand{\useTables}{0}

\newcommand{\useStdClass}{0} % If using a class not created using LiX.

% SWITCH INTERFACE: ------------------------------------------------------------
\DeclareOption{algorithms}{\renewcommand{\useAlgorithms}{1}}
\DeclareOption{basics}{\renewcommand{\useBasics}{1}}
\DeclareOption{code}{\renewcommand{\useCode}{1}}
\DeclareOption{cover}{\renewcommand{\useCover}{1}}
\DeclareOption{figures}{\renewcommand{\useFigures}{1}}
\DeclareOption{formatting}{\renewcommand{\useFormatting}{1}}
\DeclareOption{header}{\renewcommand{\useHeader}{1}}
\DeclareOption{headings}{\renewcommand{\useHeadings}{1}}
\DeclareOption{isbn}{\renewcommand{\useIsbn}{1}}
\DeclareOption{license}{\renewcommand{\useLicense}{1}}
\DeclareOption{lists}{\renewcommand{\useLists}{1}}
\DeclareOption{margins}{\renewcommand{\useMargins}{1}}
\DeclareOption{math}{\renewcommand{\useMath}{1}}
\DeclareOption{metadata}{\renewcommand{\useMetadata}{1}}
\DeclareOption{periodical}{\renewcommand{\usePeriodical}{1}}
\DeclareOption{publish}{\renewcommand{\usePublish}{1}}
\DeclareOption{refs}{\renewcommand{\useRefs}{1}}
\DeclareOption{sign}{\renewcommand{\useSign}{1}}
\DeclareOption{size}{\renewcommand{\useSize}{1}}
\DeclareOption{tables}{\renewcommand{\useTables}{1}}

\DeclareOption{stdclass}{\renewcommand{\useStdClass}{1}}

\DeclareOption{all}{
    \renewcommand{\useAlgorithms}{1}
    \renewcommand{\useBasics}{1}
    \renewcommand{\useCode}{1}
    \renewcommand{\useCover}{1}
    \renewcommand{\useFigures}{1}
    \renewcommand{\useFormatting}{1}
    \renewcommand{\useHeader}{1}
    \renewcommand{\useHeadings}{1}
    \renewcommand{\useIsbn}{1}
    \renewcommand{\useLicense}{1}
    \renewcommand{\useLists}{1}
    \renewcommand{\useMath}{1}
    \renewcommand{\useMetadata}{1}
    \renewcommand{\usePeriodical}{1}
    \renewcommand{\usePublish}{1}
    \renewcommand{\useRefs}{1}
    \renewcommand{\useSign}{1}
    \renewcommand{\useSize}{1}
    \renewcommand{\useTables}{1}
}

\DeclareOption*{\PackageWarning{lix}{Unknown '\CurrentOption'}}
\ProcessOptions\relax

% ESSENTIAL PACKAGES: ----------------------------------------------------------
\RequirePackage[utf8]{inputenc}
\RequirePackage[T1]{fontenc}
\RequirePackage[nottoc]{tocbibind}
\RequirePackage[indent]{parskip}
\RequirePackage{hyperref, microtype, multicol, lastpage, xcolor, xparse}

% ESSENTIAL SETUP: -------------------------------------------------------------
\hypersetup{hidelinks} % Remove box around links.

% BASICS: ----------------------------------------------------------------------
\ifnum\useBasics=1

    % Add ----------------------------------------------------------------------
    \newcommand{\add}[1]{\input{#1}}

    % Use ----------------------------------------------------------------------
    \newcommand{\use}[1]{\usepackage{#1}}

    % URLs ---------------------------------------------------------------------
    \renewcommand{\url}[2]{\href{#2}{#1}}

    % Table of Contents --------------------------------------------------------
    \newcommand{\toc}{\tableofcontents}
    \@ifundefined{chapter}{}{% If class is article-like.
        \addtocontents{toc}{\protect\thispagestyle{empty}}
    }

    % Columns ------------------------------------------------------------------
    \NewDocumentCommand{\cols}{smm}{
        \IfBooleanTF{#1}{%
            \begin{multicols*}{#2}%
                #3
            \end{multicols*}
        }{
            \begin{multicols}{#2}%
                #3
            \end{multicols}
        }
    }

    % Language -----------------------------------------------------------------
    \NewDocumentCommand{\lang}{mg}{%
        \RequirePackage[#1]{babel}
        \newcommand{\theLanguage}{#1}%
        \babelhyphenation[#1]{#2}
    }

    % Abstract -----------------------------------------------------------------
    \providecommand{\abstract}{}% In case it is not defined.
    \NewCommandCopy{\oldabstract}{\abstract}%
    \RenewDocumentCommand{\abstract}{m}{%
        \newcommand{\theAbstract}{#1}%
    }
    \NewDocumentCommand{\blurb}{m}{\abstract{#1}} % Alias.

    % Author -------------------------------------------------------------------
    \newcommand{\theAuthorFont}{\normalfont}
    \NewDocumentCommand{\authorfont}{m}{
        \renewcommand{\theAuthorFont}{#1}
    }
    \NewCommandCopy{\oldauthor}{\author}%
    \RenewDocumentCommand{\author}{m}{%
        \newcommand{\theAuthor}{\theAuthorFont#1}
    }
    \NewDocumentCommand{\authors}{mggggg}{%
        \newcommand{\theAuthor}{%
            \theAuthorFont#1%
            \IfValueTF{#2}{%
                \and \theAuthorFont#2%
                \IfValueTF{#3}{%
                    \and \theAuthorFont#3%
                    \IfValueTF{#4}{%
                        \and \theAuthorFont#4%
                        \IfValueTF{#5}{%
                            \and \theAuthorFont#5%
                            \IfValueTF{#6}{%
                                \and \theAuthorFont#6%
                            }{}%
                        }{}%
                    }{}%
                }{}%
            }{}%
        }%
    }

    % Byline -------------------------------------------------------------------
    \NewDocumentCommand{\by}{mmg}{
        \IfValueTF{#3}{%
            \begin{figure}[H]
                \begin{minipage}[H]{0.2\columnwidth}
                    \includegraphics[width=\columnwidth]{#3}
                \end{minipage}%
                \quad
                \begin{minipage}[H]{0.55\columnwidth}
                    #1 \\ {\footnotesize #2}
                \end{minipage}
                \vspace*{-5mm}
            \end{figure}
        }{
            #1 \\ {\footnotesize #2}
        }
    }

    % Title --------------------------------------------------------------------
    \NewCommandCopy{\oldtitle}{\title}%
    \RenewDocumentCommand{\title}{m}{%
        \newcommand{\theTitle}{#1}%
    }
    \NewDocumentCommand{\publication}{m}{\title{#1}} % Alias.

    % Subtitle -----------------------------------------------------------------
    \NewDocumentCommand{\subtitle}{m}{%
        \newcommand{\theSubtitle}{#1}%
    }
    \NewDocumentCommand{\slogan}{m}{\subtitle{#1}} % Alias.

    % Date ---------------------------------------------------------------------
    \NewCommandCopy{\olddate}{\date}%
    \RenewDocumentCommand{\date}{m}{%
        \newcommand{\theDate}{#1}%
    }

    % Keywords -----------------------------------------------------------------
    \NewDocumentCommand{\keywords}{m}{%
        \newcommand{\theKeywords}{#1}%
    }
    \NewDocumentCommand{\subjects}{m}{\keywords{#1}} % Alias.

    % Idnum --------------------------------------------------------------------
    \NewDocumentCommand{\idnum}{m}{%
        \newcommand{\theIdnum}{#1}%
    }

    % Wrap ---------------------------------------------------------------------
    \NewDocumentCommand{\wrap}{+m+g}{%
        \AddToHook{begindocument/end}{#1}%
        \IfValueTF{#2}{%
            \AtEndDocument{#2}
        }{}
    }

    % Anchor -------------------------------------------------------------------
    \NewDocumentCommand{\anchor}{mm}{%
        \ifnum\pdfstrcmp{#1}{center}=0
            \begin{center}#2\end{center}%
        \else\ifnum\pdfstrcmp{#1}{left}=0
            \begin{flushleft}#2\end{flushleft}%
        \else\ifnum\pdfstrcmp{#1}{right}=0
            \begin{flushright}#2\end{flushright}%
        \fi\fi\fi
    }
\fi

% COVER: -----------------------------------------------------------------------
\ifnum\useCover=1
    \newcommand{\printOnCover}{1}

    \NewDocumentCommand{\cover}{smg}{% Argument 2 is optional.
        \usepackage{eso-pic}%
        \IfBooleanTF{#1}{%
            \renewcommand{\printOnCover}{0}
        }{}
        \newcommand{\theFront}{#2}%
        \IfValueT{#3}{%
            \newcommand{\theBack}{#3}%
        }
    }

    \newcommand{\addFrontCover}{
        \@ifundefined{theFront}{}{%
            \AddToShipoutPicture*{%
                \put(0,0){%
                    \parbox[b][\paperheight]{\paperwidth}{%
                        \vfill\centering%
                        \includegraphics[width=\paperwidth,height=\paperheight]{\theFront}%
                        \vfill%
                    }
                }
            }
        }
    }

    \newcommand{\addBackCover}{
        \AtEndDocument{%
            \newpage\thispagestyle{empty}%
            \@ifundefined{theBack}{}{%
                \AddToShipoutPicture*{%
                    \put(0,0){%
                        \parbox[b][\paperheight]{\paperwidth}{%
                            \vfill\centering%
                            \includegraphics[width=\paperwidth,height=\paperheight]{\theBack}%
                            \vfill%
                        }%
                    }%
                }%
            }
            \@ifundefined{theAbstract}{}{%
                \centering
                \begin{minipage}{0.8\linewidth}%
                    \centering%
                    \Large{\textbf{\theTitle}}%
                \end{minipage}%

                \par\vspace{5mm}%

                \begin{minipage}{0.9\linewidth}%
                    \Large{\theAbstract}%
                \end{minipage}%
            }
            \@ifundefined{theIsbn}{}{%
                \par\vspace*{\fill}%
                \begin{minipage}{0.9\linewidth}%
                    \hfill%
                    \colorbox{white}{%
                        \expandafter\EANBarcode\expandafter{\theIsbn}%
                    }%
                \end{minipage}%
            }
        }
    }
\fi

% FIGURES: ---------------------------------------------------------------------
\ifnum\useFigures=1
    \RequirePackage{caption, float, graphicx, svg}

    \def\maxwidth#1{\ifdim\Gin@nat@width>#1 #1\else\Gin@nat@width\fi}

    \NewDocumentCommand{\fig}{mmmg}{ % One command for vectors and images.
        \begin{figure}[H]
            \centering
            \filename@parse{#3}
            \ifnum\pdfstrcmp{\filename@ext}{svg}=0%
                \sbox0{\includesvg[width=#2\columnwidth]{#3}}%
            \else%
                \sbox0{\includegraphics[width=\maxwidth{#2\columnwidth}]{#3}}%
            \fi%
            \IfValueTF{#4}{%
                \begin{minipage}{\wd0}
                    \usebox0\caption{#4}\label{#1}
                \end{minipage}
            }{%
                \usebox0\label{#1}
            }
        \end{figure}
    }
\fi

% HEADER: ----------------------------------------------------------------------
\ifnum\useHeader=1
    \RequirePackage{fancyhdr}

    \NewDocumentCommand{\header}{mgg}{%
        \newcommand{\theLeftHeader}{#1}%
        \IfValueT{#2}{%
            \newcommand{\theCenterHeader}{#2}%
        }
        \IfValueT{#3}{%
            \newcommand{\theRightHeader}{#3}%
        }
    }
\fi

% HEADINGS: --------------------------------------------------------------------
\ifnum\useHeadings=1
    \@ifundefined{chapter}{% If class is article-like.
        \NewDocumentCommand{\h}{sm}{%
            \IfBooleanTF{#1}{%
                \section*{#2}\label{#2}%
                \addcontentsline{toc}{section}{#2}%
            }{%
                \section{#2}\label{#2}%
            }
        }
        \NewDocumentCommand{\hh}{sm}{%
            \IfBooleanTF{#1}{%
                \subsection*{#2}\label{#2}%
                \addcontentsline{toc}{subsection}{#2}%
            }{%
                \subsection{#2}\label{#2}%
            }
        }
        \NewDocumentCommand{\hhh}{sm}{%
            \IfBooleanTF{#1}{%
                \subsubsection*{#2}\label{#2}%
                \addcontentsline{toc}{subsubsection}{#2}%
            }{%
                \subsubsection{#2}\label{#2}%
            }
        }
        \NewDocumentCommand{\hhhh}{sm}{%
            \IfBooleanTF{#1}{%
                \paragraph*{#2}
            }{%
                \paragraph{#2}
            }
        }
    }{% If class is book-like.
        \NewDocumentCommand{\h}{sm}{%
            \IfBooleanTF{#1}{%
                \chapter*{#2}\label{#2}%
                \addcontentsline{toc}{chapter}{#2}%
            }{%
                \chapter{#2}\label{#2}%
            }
        }
        \NewDocumentCommand{\hh}{sm}{%
            \IfBooleanTF{#1}{%
                \section*{#2}\label{#2}%
                \addcontentsline{toc}{section}{#2}%
            }{%
                \section{#2}\label{#2}%
            }
        }
        \NewDocumentCommand{\hhh}{sm}{%
            \IfBooleanTF{#1}{%
                \subsection*{#2}\label{#2}%
                \addcontentsline{toc}{subsection}{#2}%
            }{%
                \subsection{#2}\label{#2}%
            }
        }
        \NewDocumentCommand{\hhhh}{sm}{%
            \IfBooleanTF{#1}{%
                \subsubsection*{#2}\label{#2}%
                \addcontentsline{toc}{subsubsection}{#2}%
            }{%
                \subsubsection{#2}\label{#2}%
            }
        }
    }
\fi

% ISBN: ------------------------------------------------------------------------
\ifnum\useIsbn=1
    \RequirePackage{GS1}

    \NewDocumentCommand{\isbn}{m}{%
        \GSSetup{ocrb=true,module_height=5ex}%
        \newcommand{\theIsbn}{#1}%
    }
\fi

% LISTS: -----------------------------------------------------------------------
\ifnum\useLists=1
    \RequirePackage{enumitem, xstring}

    \newlist{bullets}{itemize}{10}
    \setlist[bullets,1]{leftmargin=4mm}
    \setlist[bullets]{leftmargin=*,label=$\vcenter{\hbox{\tiny$\bullet$}}$,labelindent=1mm}

    \newlist{numbers}{enumerate}{10}
    \setlist[numbers,1]{leftmargin=6mm}
    \setlist[numbers]{leftmargin=*,label*=\arabic*.,labelindent=0mm}

    \ExplSyntaxOn
    \NewDocumentCommand{\items}{s+v}{%
        \begingroup%
            \newlinechar=\endlinechar
            \StrSubstitute{#2}{¤ }{\string\item }[\temp]%
            \IfBooleanTF{#1}{%
                \exp_args:Nx \scantokens{%
                    \string\begin{bullets}
                    \temp%
                    \string\end{bullets}%
                }
            }{%
                \exp_args:Nx \scantokens{%
                    \string\begin{numbers}
                    \temp%
                    \string\end{numbers}%
                }
            }
        \endgroup%
    }
    \ExplSyntaxOff
\fi

% MATH: ------------------------------------------------------------------------
\ifnum\useMath=1
    \RequirePackage{amsfonts, amsmath, amssymb, esint, siunitx}

    \newcommand{\mean}[1]{\overline{#1}}
    \renewcommand{\epsilon}{\varepsilon}

    \renewcommand{\Re}{\mathbb{R}} % Real set.
    \renewcommand{\Im}{\mathbb{I}} % Imaginary set.
    \newcommand{\N}{\mathbb{N}}    % Natural set.
    \newcommand{\Z}{\mathbb{Z}}    % Integer set.
    \newcommand{\Q}{\mathbb{Q}}    % Rational set.
    \newcommand{\C}{\mathbb{C}}    % Complex set.

    \newcommand{\m}[1]{$#1$} % Inline math.

    \RenewDocumentCommand{\math}{mm}{% Block of math.
        \vspace{-0.5\baselineskip}
        \begin{equation}\label{#1}
            #2
        \end{equation}
    }
\fi

% METADATA: --------------------------------------------------------------------
\ifnum\useMetadata=1
    \newcommand{\addMetadata}{%
        \hypersetup{%
            pdftitle={\@ifundefined{theTitle}{}{\theTitle}},
            pdfauthor={\@ifundefined{theAuthor}{}{\theAuthor}},
            pdfsubject={\@ifundefined{theSubtitle}{}{\theSubtitle}},
            pdfkeywords={\@ifundefined{theKeywords}{}{\theKeywords}},
            pdfcreator={LaTeX with the LiX Package}
        }
    }
\fi

% PERIODICAL: ------------------------------------------------------------------
\ifnum\usePeriodical=1
    \NewDocumentCommand{\cost}{m}{%
        \newcommand{\theCost}{#1}%
    }

    \NewDocumentCommand{\issue}{m}{%
        \newcommand{\theIssue}{#1}%
    }

    \NewDocumentCommand{\location}{m}{%
        \newcommand{\theLocation}{#1}%
    }

    \NewDocumentCommand{\volume}{m}{%
        \newcommand{\theVolume}{#1}%
    }
\fi

% PUBLISH: ---------------------------------------------------------------------
\ifnum\usePublish=1
    \NewDocumentCommand{\dedicate}{mm}{%
        \newcommand{\theDedicatee}{#1}%
        \newcommand{\theMessage}{#2}%
    }

    \NewDocumentCommand{\edition}{mm}{%
        \RequirePackage{numspell}%
        \newcommand{\theEdition}{#1}%
        \newcommand{\theYear}{#2}%
    }

    \NewDocumentCommand{\note}{m}{%
        \newcommand{\theNote}{#1}%
    }

    \NewDocumentCommand{\publisher}{m}{%
        \newcommand{\thePublisher}{#1}%
    }

    \NewDocumentCommand{\thank}{m}{%
        \newcommand{\theThankyou}{#1}%
    }

    \newcommand{\addFormalPage}{
        \thispagestyle{empty}{%
            \clearpage\raggedright\footnotesize%
            \begin{minipage}{0.6\linewidth}
                \@ifundefined{theDedicatee}{}{%
                    {\large{\textit{To \theDedicatee}}\par%
                    \vspace{3mm}%
                    \normalsize{\textit{\theMessage.}}}%
                }
            \end{minipage}

            \null\vfill%

            \begin{minipage}{0.6\linewidth}
                \@ifundefined{theNote}{}{%
                    \textbf{Author's Note}: \theNote%
                    \vspace{8mm}\par%
                }
                \@ifundefined{thePublisher}{}{%
                    \textbf{Publisher}: \thePublisher\par%
                }
                \@ifundefined{theEdition}{}{%
                    \Ordnumspell{\theEdition} edition, published in \theYear.\par%
                }
                \@ifundefined{theThankyou}{}{%
                    \theThankyou.\par%
                }
                \@ifpackageloaded{doclicense}{%
                    \vspace{8mm}%
                    \textbf{Copyright} 2022--\the\year\ \theCopyrightHolder\par%
                    %\doclicenseLongText \par%
%                    \vspace{1mm}%
%                    \doclicenseIcon%
                    \par%
                }{}
            \end{minipage}

            \@ifundefined{theIsbn}{}{%
                \vspace{8mm}%
                ISBN: \theIsbn \hspace{2mm} \par\vspace{1mm}%
                \expandafter\EANBarcode\expandafter{\theIsbn}%
            }
        }%
        \newpage%
    }
\fi

% SIGN: ------------------------------------------------------------------
\ifnum\useSign=1
    \RequirePackage{tabularray}

    \NewDocumentCommand{\sign}{mm}{%
        \noindent%
        \begin{tblr}{colspec={cc}, rowsep={0pt}, row{4}={abovesep+=4pt},vspan={minimal}}%
            \\ \\ \\
            \cline{2,4}
            & {\small #1} & & {\small Date} & \\ & {\scriptsize #2}
        \end{tblr}%
        \vspace*{0.5em}
    }
\fi

% SIZE: ------------------------------------------------------------------------
\ifnum\useSize=1
    \RequirePackage{fancyhdr, geometry}

    \NewDocumentCommand{\size}{mg}{% Argument 2 is optional.
        \IfValueTF{#2}{%
            \geometry{paper= #1paper, #2}
        }{
            \geometry{paper= #1paper}
        }
    }

    \NewDocumentCommand{\margins}{mggg}{% Arguments 2,3,4 are optional.
        \IfValueTF{#4}{% If four arguments are given.
            \geometry{top=#1, bottom=#2, left=#3, right=#4}%
        }{%
            \IfValueTF{#3}{% If three arguments are given.
                \geometry{top=#1, bottom=#1, left=#2, right=#3}%
            }{%
                \IfValueTF{#2}{% If two arguments are given.
                    \geometry{top=#1, bottom=#1, left=#2, right=#2}%
                }{% If one argument is given.
                    \geometry{top=#1, bottom=#1, left=#1, right=#1}%
                }
            }
        }
        \fancyhfoffset[O]{0pt}
    }
\fi

% REFERENCES: ------------------------------------------------------------------
\ifnum\useRefs=1
    \RequirePackage{cite}

    \renewcommand{\r}[1]{\renewcommand\lstlistingautorefname{snippet}\renewcommand\figureautorefname{figure}\renewcommand\equationautorefname{equation}\renewcommand\tableautorefname{table}\renewcommand\sectionautorefname{section}\renewcommand\subsectionautorefname{section}\renewcommand\subsubsectionautorefname{section}\renewcommand\paragraphautorefname{section}\renewcommand\subparagraphautorefname{section}\autoref{#1}}

    \newcommand{\R}[1]{\renewcommand\lstlistingautorefname{Snippet}\renewcommand\figureautorefname{Figure}\renewcommand\equationautorefname{Equation}\renewcommand\tableautorefname{Table}\renewcommand\sectionautorefname{Section}\renewcommand\subsectionautorefname{Section}\renewcommand\subsubsectionautorefname{Section}\renewcommand\paragraphautorefname{Section}\renewcommand\subparagraphautorefname{Section}\autoref{#1}}

    \newcommand{\theBibfont}{\normalfont} % Default.
    \NewDocumentCommand{\bibfont}{m}{
        \renewcommand{\theBibfont}{#1}
    }

    \NewDocumentCommand{\bib}{mg}{%
        \IfValueTF{#2}{%
            \bibliographystyle{#2}
        }{%
            \bibliographystyle{unsrt} % Sort by order of appearance.
        }
        \providecommand{\refname}{}
        \renewcommand\refname{\normalsize{References}}
        {\theBibfont\bibliography{#1}}
    }
\fi

% TABLES: ----------------------------------------------------------------------
\ifnum\useTables=1
    \RequirePackage{caption, tabularray}

    \NewDocumentCommand{\tabs}{mmmg}{
        \begin{table}[H]
            \centering
            \ifnum\pdfstrcmp{#2}{cols}=0
                \sbox0{%
                    \begin{tblr}{%
                        hline{1,2,Z} = {0.1pt,solid},
                        rowsep = {1pt}, hspan = even}%
                        #3
                    \end{tblr}%
                }
            \else\ifnum\pdfstrcmp{#2}{rows}=0
                \sbox0{%
                    \begin{tblr}{%
                        hline{1,Z} = {0.1pt,solid},
                        vline{2} = {0.1pt,solid},
                        rowsep = {1pt}, hspan = even}%
                        #3
                    \end{tblr}%
                }
            \else\ifnum\pdfstrcmp{#2}{grid}=0
                \sbox0{%
                    \begin{tblr}{%
                        hline{1,2,Z} = {0.1pt,solid},
                        vline{2} = {0.1pt,solid},
                        rowsep = {1pt}, hspan = even}%
                        #3
                    \end{tblr}%
                }
            \else
                \sbox0{%
                    \begin{tblr}{#2}%
                        #3
                    \end{tblr}%
                }
            \fi\fi\fi
            \IfValueTF{#4}{%
                \begin{minipage}{\wd0}%
                    \usebox0\caption{#4}\label{#1}%
                \end{minipage}%
            }{%
                \usebox0\label{#1}%
            }
        \end{table}
    }
\fi

% LICENSE: ---------------------------------------------------------------------
\ifnum\useLicense=1
    \NewDocumentCommand{\license}{mmmg}{%
        \usepackage[type={#1},modifier={#2},version={#3}]{doclicense}%
        \IfValueTF{#4}{% If two arguments are given.
            \newcommand{\theCopyrightHolder}{#4}
        }{
            \newcommand{\theCopyrightHolder}{The Pactus Blockchain}
        }
    }
\fi

% CODE: ------------------------------------------------------------------------
\ifnum\useCode=1
    \RequirePackage{caption, inconsolata, listings}

    \lstdefinestyle{inline}{% Inline styling.
        basicstyle=\ttfamily\small, breaklines=true%
    }

    \RenewDocumentCommand{\c}{v}{%
        \lstinline[style=inline]{#1}%
    }

    \lstdefinestyle{block}{% Block styling.
        basicstyle=\ttfamily\footnotesize,
        commentstyle=\color[rgb]{0.5,0.5,0.5},
        breaklines=true,
        numbers=left,
        gobble=4,
        numberstyle=\tiny,
        numbersep=7pt,
        aboveskip=0.5em,
        belowskip=0em,
        showstringspaces=false,
        xleftmargin=14pt,
        postbreak=\mbox{\hspace{-2.5em}\textcolor{gray}{$\hookrightarrow$}\space\space}
    }

    \ExplSyntaxOn
        \NewDocumentCommand{\code}{mm +v g}{%
            \begingroup%
                \noindent{\tiny\dotfill}%
                \newlinechar=\endlinechar
                \exp_args:Nx \scantokens{
                    \string\begin{lstlisting}[\unexpanded{language=#2,style=block}]
                    #3
                    \string\end{lstlisting}%
                }
                \noindent{\tiny\dotfill}
                \IfValueTF{#4}{%
                    \captionsetup{type=lstlisting}%
                    \caption{#4}%
                }{}
                \label{#1}%
            \endgroup%
        }
    \ExplSyntaxOff

    % Add reference category for code blocks.
    \renewcommand{\lstlistingname}{Snippet}
    \providecommand*{\lstlistingautorefname}{snippet}
\fi

% ALGORITHMS: ------------------------------------------------------------------
\ifnum\useAlgorithms=1
    \RequirePackage{caption, inconsolata, listings}

    \lstdefinelanguage{alg}{
        morekeywords={%
            assert,def,do,else,end,ensure,for,function,%
            if,in,let,require,return,stop,then,while%
        }
    }
    \lstdefinestyle{algorithm}{% Block styling.
        basicstyle=\ttfamily\footnotesize,
        commentstyle=\color[rgb]{0.5,0.5,0.5},
        mathescape=true,
        breaklines=true,
        numbers=left,
        gobble=4,
        numberstyle=\tiny,
        numbersep=7pt,
        aboveskip=0.5em,
        belowskip=0em,
        showstringspaces=false,
        xleftmargin=14pt,
        postbreak=\mbox{\hspace{-2.5em}\textcolor{gray}{$\hookrightarrow$}\space\space}
    }
    \ExplSyntaxOn
        \NewDocumentCommand{\algo}{m +v g}{%
            \begingroup%
                \noindent{\tiny\dotfill}%
                \newlinechar=\endlinechar
                \exp_args:Nx \scantokens{
                    \string\begin{lstlisting}[\unexpanded{language=alg,style=algorithm}]
                    #2
                    \string\end{lstlisting}%
                }
                \noindent{\tiny\dotfill}
                \IfValueTF{#3}{%
                    \captionsetup{type=lstlisting}%
                    \caption{#3}%
                }{}
                \label{#1}%
            \endgroup%
        }
    \ExplSyntaxOff
\fi

% FORMATTING: ------------------------------------------------------------------
\ifnum\useFormatting=1
    \RequirePackage{ulem}

    \normalem % Allow italized and underlined text.
    \renewcommand{\b}[1]{\textbf{#1}} % Bold.
    \renewcommand{\i}[1]{\textit{#1}} % Italic.
    \renewcommand{\u}[1]{\uline{#1}}  % Underline.
    \newcommand{\s}[1]{\sout{#1}}     % Strikethrough.

    \RequirePackage{lettrine}         % Large first letter (lettrine).
    \RenewDocumentCommand{\l}{mg}{
        \lettrine[nindent=2.4pt, findent=-1.5pt, loversize=0.06]{\textbf{#1}}{\IfValueTF{#2}{#2}{}}
    }
\fi


% LAYOUT -----------------------------------------------------------------------
\ifnum\useStdClass=1
    \AddToHook{begindocument/end}{%
        \@ifundefined{theTitle}{}{%

            \@ifundefined{theSubtitle}{%
                \oldtitle{\theTitle}%
            }{%
                \oldtitle{\theTitle\\[0.4ex]%
                \large\theSubtitle}%
            }
        }
        \@ifundefined{theAuthor}{%
            \oldauthor{}%
        }{%
            \oldauthor{\theAuthor}%
        }
        \@ifundefined{theDate}{%
            \olddate{}%
        }{%
            \olddate{\theDate}%
        }

        \@ifundefined{theTitle}{}{%
            \maketitle%
        }

        \@ifundefined{theAbstract}{}{%
            \oldabstract \theAbstract%
        }
        \addMetadata
    }
\fi