# How to treat lists like regular text (regarding vertical spacing)?

Context: I want to treat lists (itemize, enumerate, and description) just like regular text for what regards vertical spacing. Namely:

1. If the list starts a paragraph, insert a vertical \parskip beforehand — no vertical spacing otherwise;
2. No vertical spacing between items of the list;
3. If the list ends a paragraph, insert a vertical \parskip afterwards — no vertical spacing otherwise.

I have notably used information found in \topsep, \itemsep, \partopsep and \parsep - what does each of them mean.

Requirement #1 is solved with \setlist{topsep=-\parskip,partopsep=\parskip}.

Requirement #2 is solved with \setlist{noitemsep}.

Problem: There remain two issues with Requirement #3:

• A vertical space is added after the list if the latter starts a paragraph, even if this list is immediately followed by text. (I.e. there is no such thing as an idependent parbottomsep length).
• If a new paragraph starts after the list, this paragraph is not preceded with a \parskip.

Question: How to comply with Requirement #3?
(I currently use manual patches — see MWE below — but it is of course not satisfactory.)

MWE

\documentclass[parskip=half]{scrartcl}
\usepackage{enumitem}
\setlist{%
topsep=-\parskip,
partopsep=\parskip,
noitemsep,
}
\begin{document}
This sentence is a paragraph on its own; there is thus a vertical parskip prior next paragraph.

Following list is \emph{within} a paragraph, with preceding and appended text.
\begin{itemize}
\item One,
\item Two,
\begin{itemize}
\item Two and a half;
\item Almost three.
\end{itemize}
\item Three.
\end{itemize}
This text is appended to the previous list.
However, following list starts a new paragraph on its own.

\begin{enumerate}
\item Did you notice the vertical spacing preceding this list?
\item Two,
\begin{enumerate}
\item Two and a half;
\item Almost three.
\end{enumerate}
\item Three.
\end{enumerate}
%   \vspace{-\parskip}                                  %quick and dirty solution
\textbf{There shouldn't be a vertical spacing here.}
This text is appended to the previous list too.

And finally, a list with preceding text only.
\begin{itemize}
\item One,
\item Two,
\begin{itemize}
\item Two and a half;
\item Almost three.
\end{itemize}
\item Three.
\end{itemize}

%   \null\par                                            %quick and dirty solution
\textbf{There should be a vertical spacing here.}
This is a new paragraph.
It should thus be preceded with parskip.
\end{document}


This is hardly less dirty, but it uses the tools provided by enumitem, playing with the after key:

\documentclass[parskip=half]{scrartcl}
\usepackage{enumitem}
\setlist{%
topsep=-\parskip,
partopsep=\parskip,
noitemsep,
}

\begin{document}

This sentence is a paragraph on its own; there is thus a vertical parskip prior next paragraph.

Following list is \emph{within} a paragraph, with preceding and appended text.
\begin{itemize}
\item One,
\item Two,
\begin{itemize}
\item Two and a half;
\item Almost three.
\end{itemize}
\item Three.
\end{itemize}
This text is appended to the previous list.
However, following list starts a new paragraph on its own.

\begin{enumerate}[after =\vspace*{-\partopsep}]
\item Did you notice the vertical spacing preceding this list?
\item Two,
\begin{enumerate}
\item Two and a half;
\item Almost three.
\end{enumerate}
\item Three.
\end{enumerate}
\textbf{There shouldn't be a vertical spacing here.}
This text is appended to the previous list too.

And finally, a list with preceding text only.
\begin{itemize}[after = \vspace*{\partopsep}]
\item One,
\item Two,
\begin{itemize}
\item Two and a half;
\item Almost three.
\end{itemize}
\item Three.
\end{itemize}

\textbf{There should be a vertical spacing here.}
This is a new paragraph.
It should thus be preceded with parskip.

\end{document}


• That's indeed more semantically correct! – ebosi Feb 10 '18 at 1:01