booktemplate/booktemplate.sty

\NeedsTeXFormat{LaTeX2e}[1999/12/01]
\ProvidesPackage{booktemplate}
\RequirePackage[explicit]{titlesec}
\RequirePackage{ebgaramond}
\RequirePackage[utf8]{inputenc}
\RequirePackage[english]{babel}
\RequirePackage[T1]{fontenc}
\RequirePackage{etoolbox}
\RequirePackage{graphicx}
\RequirePackage{adjustbox}

%%%%%%% Page size and general typesetting %%%%%%%
\setstocksize{216.41mm}{154.43mm}
\settrimmedsize{210mm}{148mm}{*}
%% 3.2 mm (top), 6.43 (left or right), 3.21 mm (bottom)
\settrims{3.2mm}{6.43mm}

%% To check what this looks like sans trims:
% \setstocksize{210mm}{148mm}
% \settrimmedsize{210mm}{148mm}{*}
% \settrims{0mm}{0mm}

% To see the outlines of the trims, use the memoir class's
% `showtrims' option in your main tex file:
% \documentclass[11pt,showtrims]{memoir}

\setlrmarginsandblock{22mm}{22mm}{*}
\setulmarginsandblock{20mm}{20mm}{*}
\checkandfixthelayout

% Typesetting details from
% http://www.khirevich.com/latex/microtype/
\usepackage[activate={true,nocompatibility},final,tracking=true,kerning=true,spacing=true,factor=1100,stretch=10,shrink=10]{microtype}
\frenchspacing

% Prefer increasing the inter-word spacing over creating overlong lines
\setlength{\emergencystretch}{.5em}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%% Custom design elements %%%%%%%
\newcommand{\chapterstart}[1]{%
    \noindent\textsc{#1}%
}

\newcommand{\sectionrule}{%
\begin{center}
    $\infty$
\end{center}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%% Chapter/section titles %%%%%%%
% Chapter titles:
% Horizontal rule, chapter title in italics, horizontal rule
% Based on the style 'daleif3' in http://tug.ctan.org/info/MemoirChapStyles/MemoirChapStyles.pdf
\makeatletter
\makechapterstyle{customchapter}{
    % don't print "Chapter ..."
    \renewcommand\chapternamenum{}\renewcommand\printchaptername{}
    % don't print the chapter number
    \renewcommand\printchapternum{}
    \setlength\midchapskip{7pt}
    \renewcommand\chaptitlefont{\huge\itshape\centering}
    \renewcommand\afterchapternum{%
        \hrule\vskip\midchapskip%
    }
    \renewcommand\afterchaptertitle{%
        \par\vskip-2\midchapskip%
        \rule\textwidth\normalrulethickness
        \nobreak\vskip\afterchapskip%
    }
}
\makeatother
\chapterstyle{customchapter}

% Mid-height horizontal rules
% Based on https://tex.stackexchange.com/a/451330 (CC BY-SA 4.0)
\makeatletter
\def\myrulefill#1#2{\leavevmode\leaders\hrule\@height#1\@depth#2\hfill \kern\z@}
\makeatother
\newcommand*\crulefilllower[1][0.4pt]{\myrulefill{\dimexpr(1ex+#1)/2}{\dimexpr(-1ex+#1)/2}}
\newcommand*\crulefillupper[1][0.9pt]{\myrulefill
    {\dimexpr(\fontcharht\font`X+#1)/2}{\dimexpr(-\fontcharht\font`X+#1)/2}}

% Section titles:
% Title in italics, between horizontal rules
\titleformat{\section}{}{}{0pt}{\itshape\crulefilllower~#1~\crulefilllower}

% Subsection titles:
% Title in boldface
\titleformat{\subsection}{}{}{0pt}{\bfseries#1}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%% Headers/footers %%%%%%%
% Even pages: book title in small caps
% Odd pages: chapter title in italics
% Based on https://tex.stackexchange.com/a/38449 (CC BY-SA 3.0)
\nouppercaseheads
\makepagestyle{mystyle} 
\setlength{\headwidth}{\textwidth}
\makerunningwidth{mystyle}{\headwidth}
\makeevenhead{mystyle}{\thepage}{\textsc\booktitle}{} 
\makeoddhead{mystyle}{}{\itshape\leftmark}{\thepage} 
\makeatletter
\makepsmarks{mystyle}{%
  \createmark{chapter}{left}{nonumber}{}{}
}
\makeatother
\pagestyle{mystyle}

% No page numbers on chapter opening pages
\makeoddfoot{plain}{}{}{}
\chapterstyle{plain}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%% Front matter pages %%%%%%%
% Half-title (page that contains just the title)
\newcommand{\halftitlepage}[1][\booktitle]{
    \vspace*{\fill}
    \begin{center}
    \Huge{#1}
    \end{center}
    \vspace{0.6\textheight}
    \newpage
    % Also add empty page
    \null
    \newpage
}

% Title page (styled like the cover)
% - extra large font sizes
\newcommand{\extrahuge}[1]{%
    \fontsize{50}{60}\selectfont#1%
}
\newcommand{\veryhuge}[1]{%
    \fontsize{35}{42}\selectfont#1%
}
% - the actual title page
\newcommand{\titlepage}[5]{
\begin{center}
    {\Large #1}\\ % Designer
    \vspace{2em}
    {\huge #2}\\ % Author
    \vspace{\fill}
    #3\\ % Book title
    \vspace{\fill}
    {\LARGE\bfseries\scshape #4}\\ % Series title
    \vspace{0.5em}
    {\LARGE\bfseries\scshape\crulefilllower~#5~\crulefilllower} % Number in series
\end{center}
\newpage
}

% Colophon page
\newcommand{\colophonpage}[3]{
\vspace*{\fill}
\begin{center}
\begin{minipage}{0.7\textwidth}
    {\centering
        {\large\textit{\booktitle}}\\
        #1\\% "designed by..."
    }
    \sectionrule
    #2  % main part
    \sectionrule
    {\centering
    This is the \_\_\_ copy of this edition.\\
    }
\end{minipage}
\end{center}
\newpage
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%% Front matter style %%%%%%%
% No page numbers in the front matter
% https://tex.stackexchange.com/a/53491 (CC BY-SA 3.0)
\makeatletter
\aliaspagestyle{title}{empty}
\let\origps@chapter\ps@chapter
\preto\frontmatter{\let\ps@chapter\ps@empty\pagestyle{empty}}
\preto\mainmatter{%
  \cleardoublepage
  \let\ps@chapter\origps@chapter\pagestyle{headings}}
\makeatother

% Table of contents:
% - no chapter/section numbers
\renewcommand{\chapternumberline}[1]{}
\renewcommand{\thesection}{}
% - dots for chapters
\renewcommand{\cftchapterdotsep}{\cftdotsep}
% - include subsections
\setcounter{tocdepth}{2}
% - indent subsections further
\makeatletter
\renewcommand*\l@subsection{\@dottedtocline{1}{6em}{0em}}
\makeatother
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%% Main matter %%%%%%%
\newcommand{\startmainmatter}[1][7]{
\mainmatter
\pagestyle{mystyle}
\setcounter{page}{#1}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%% Appendix %%%%%%%
\newcommand{\startappendix}{
\cleardoublepage
\chapter{Appendix}
\setcounter{page}{1}
\pagenumbering{roman}
}
%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%% Hyphenation %%%%%%%
% Minimum extra line length before the compiler starts complaining
\hfuzz=2.2pt
% Ways to fix line breaks:
% - \\
% - \allowbreak{}
% - \- (inserts hyphen if LaTeX breaks the line)
% - \mbox{ ... } (no break!)
% - ~ (non-breaking space)

% Use these when custom hyphenation doesn't do the trick.
% They stretch the whitespace in otherwise too short lines
% (include up to the word before the one that's overlong).
\newcommand{\spreadlinepar}[1]{%
\makebox[\dimexpr\linewidth-\parindent][s]{#1}\\%
}
\newcommand{\spreadlinemid}[1]{%
\makebox[\dimexpr\linewidth][s]{#1}\\%
}

\hyphenation{ex-am-ple}
%%%%%%%%%%%%%%%%%%%%%%%%%%%

\endinput