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%% The package is licenced under Creative Commons Attribution-ShareAlike
%% 4.0 International (CC BY-SA 4.0)
\ProvidesPackage{eqexpl}[2019/05/15 v. 1.1]
\RequirePackage{etoolbox}
\RequirePackage{xparse}
\RequirePackage{calc}
%% Spaces between elements
\newlength{\eqexplSpaceWidth}
\newcommand{\eqexplSetSpace}[1]{%
\setlength{\eqexplSpaceWidth}{\ifstrempty{#1}{2mm}{#1}}%
}
\eqexplSetSpace{}
%% Width of 'intro' (typ. 'where')
\newcommand{\eqexplSetIntro}[1]{%
\def\eqexplIntro{#1}%
}
\eqexplSetIntro{}
%% Width of delimiter
\newcommand{\eqexplSetDelim}[1]{%
\def\eqexplDelim{#1}%
}
\eqexplSetDelim{---}
%% Width of item
\newcommand{\eqexplSetItemWidth}[1]{%
\def\eqexplItemWidth{#1}%
}
\eqexplSetItemWidth{5mm}
%% Align of item
\newcommand{\eqexplSetItemAlign}[1]{%
\def\eqexplItemAlign{#1}%
}
\eqexplSetItemAlign{r}
\newlength{\itemWidth}
\newlength{\leftSideWidth}
\newenvironment{eqexpl}[1][\eqexplItemWidth]{%
\let\olditem\item%
\setlength{\itemWidth}{#1}%
\setlength{\leftSideWidth}{\ifdefempty{\eqexplIntro}{}{\widthof{\eqexplIntro}+%
\eqexplSpaceWidth+}%
\itemWidth+%
\eqexplSpaceWidth+%
\widthof{\eqexplDelim}+%
\eqexplSpaceWidth}%
\newtoggle{eqexplFirstItem}%
\toggletrue{eqexplFirstItem}%
\RenewDocumentCommand{\item}{ m O{\eqexplDelim}}{%
\olditem \makebox[\leftSideWidth]{%
\ifdefempty{\eqexplIntro}{}{
\makebox[\widthof{\eqexplIntro}][l]{\iftoggle{eqexplFirstItem}{\eqexplIntro}{}}%
\hspace{\eqexplSpaceWidth}%
}
\makebox[\itemWidth][\eqexplItemAlign]{##1}%
\hspace{\eqexplSpaceWidth}%
\makebox[\widthof{##2}][c]{##2}%
\hspace{\eqexplSpaceWidth}%
}%
\togglefalse{eqexplFirstItem}%
\ignorespaces% https://tex.stackexchange.com/a/44062
}%
\begin{list}{}{\setlength{\parsep}{0pt}%
\setlength{\topsep}{0pt}%
\setlength{\itemsep}{0pt}%
\setlength{\labelsep}{0pt}%
\setlength{\leftmargin}{\leftSideWidth}%
\setlength{\itemindent}{-\leftSideWidth}}}{%
\end{list}
}
\endinput
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