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% Benjamin McKay
% b.mckay@ucc.ie
% see epigraph-keys.pdf or epigraph-keys.tex for more information.
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{epigraph-keys}[2020/04/22 v1.0 Epigraphs using key values]
\RequirePackage{enumitem}
\RequirePackage{pgfkeys}
\RequirePackage{conditionals}
\RequirePackage{microtype}
\ProcessOptions\relax
\makeatletter
{\catcode`\!=8 % funny catcode so ! will be a delimiter
\catcode`\Q=3 % funny catcode so Q will be a delimiter
\long\gdef\given#1{88\fi\Ifbl@nk#1QQQ\empty!}
\long\gdef\blank#1{88\fi\Ifbl@nk#1QQ..!}% if null or spaces
\long\gdef\nil#1{\IfN@Ught#1* {#1}!}% if null
\long\gdef\IfN@Ught#1 #2!{\blank{#2}}
\long\gdef\Ifbl@nk#1#2Q#3!{\ifx#3}% same as above
}
\makeatother
% The expression \if\expblank{...} x \else y \if gives x when ... expands out to be blank space.
\def\expblank{\expandafter\blank\expandafter}
\def\expgiven{\expandafter\given\expandafter}
\def\expnil{\expandafter\nil\expandafter}
\def\beforeepigraphskip{0pt}
\def\afterepigraphskip{\baselineskip}
\def\epigraphtextindent{2cm}
\def\epigraphauthorsourceindent{1.5cm}
\def\epigraphtextwidth{\linewidth}
\def\epigraphstyle{\small}
\def\epigraphdash{---}
\def\epigraphquotefont{\itshape}
\def\epigraphtranslationfont{}
\pgfkeys{
/epigraph/.is family,
/epigraph,
default/.style = {
author = {},
source = {},
etc = {},
translation = {},
},
author/.store in = \epigraphauthor,
source/.store in = \epigraphsource,
etc/.store in = \epigraphetc,
translation/.store in = \epigraphtranslation,
before skip/.store in = \beforeepigraphskip,
before skip/.default = 0pt,
after skip/.store in = \afterepigraphskip,
after skip/.default = \baselineskip,
text indent/.store in = \epigraphtextindent,
text indent/.default = 2cm,
author and source indent/.store in = \epigraphauthorsourceindent,
author and source indent/.default = 1.5cm,
width/.store in = \epigraphtextwidth,
width/.default = \linewidth,
style/.store in = \epigraphstyle,
style/.default = \small,
dash/.store in = \epigraphdash,
dash/.default = ---,
quote style/.store in = \epigraphquotefont,
quote style/.default = {},
translation style/.store in = \epigraphtranslationfont,
translation style/.default = {},
}
\ifdefined\epigraph\else\xdef\epigraph{}\fi
\renewcommand{\epigraph}[2][]{
\pgfkeys{/epigraph,default,#1}
\epigraphstyle\vspace{\beforeepigraphskip}
\begin{enumerate}[leftmargin=\epigraphtextindent]
\item[]
{%%
\epigraphquotefont{}%
\begin{minipage}{\epigraphtextwidth}%
#2%
\end{minipage}%
}%%
\if\expblank{\epigraphtranslation}
\else
\item[]
{%
\epigraphtranslationfont%
{%%%%
\begin{minipage}{\epigraphtextwidth}%
\epigraphtranslation%
\end{minipage}
}%%%%
}%
\fi
\if\expblank{\epigraphauthor}
\if\expblank{\epigraphsource}
\if\expblank{\epigraphetc}
\else\epigraphetc
\fi
\else
\begin{enumerate}[leftmargin=\epigraphauthorsourceindent]%
\item[\epigraphdash]%
{%%
\smallerSmallCapsTracking{}\textsc{\epigraphsource}
}%%
\if\expblank{\epigraphetc}%
\else{}, \epigraphetc
\fi
\end{enumerate}
\fi
\else
\begin{enumerate}[leftmargin=\epigraphauthorsourceindent]%
\item[\epigraphdash] \epigraphauthor \\
\if\expblank{\epigraphsource}%
\if\expblank{\epigraphetc}%
\else\epigraphetc%
\fi%
\else%
\begingroup
\smallerSmallCapsTracking{}\textsc{\epigraphsource}%
\endgroup
\if\expblank{\epigraphetc}%
\else%
\begingroup%
, \epigraphetc
\endgroup
\fi
\fi
\end{enumerate}
\fi
\end{enumerate}
\vspace{\afterepigraphskip}
\par\noindent
}
\newcommand{\smallerSmallCapsTracking}%
{%
\SetTracking{encoding={*}, shape=sc}{20}%
}%
\ifdefined\epigraphs\else\xdef\epigraphs{}\fi
\renewenvironment{epigraphs}{\begin{enumerate}}{\end{enumerate}}
\ifdefined\qitem\else\xdef\qitem{}\fi
\renewcommand{\qitem}[2][]{\item[]\epigraph[#1]{#2}}
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