Horizontal line between text blocks that's omitted at pagebreak

Question

I'm trying to define a command that adds a horizontal line after text blocks, but I'm struggling to find a way to omit the line at pagebreak – the text blocks should be separated by either the horizontal line or a page break, never both.

Here's a MWE showing my approach:

\documentclass[paper=a5]{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage{blindtext}

\newcommand{\mycommand}[1]{%
  #1%
  \vspace{.1ex}\begin{center}\rule{.25\textwidth}{0.4pt}\end{center}\vspace{.1ex}%
}

\begin{document}

\mycommand{\blindtext[2]}
\mycommand{some text some text some text some text some text some text some text}

\end{document}

Output

There's a horizontal line at the top of the second page that I want to be omitted. How can I do that?

I read Reacting to a page break in LaTeX but I didn't find a way to adapt its solution to my problem.

Answer 1

The old trick of leaders should do.

\documentclass[paper=a5]{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage{blindtext}

\newcommand{\mybreak}{%
  \par
  \nointerlineskip
  \cleaders\vbox to 5ex{%
    \vss
    \hbox to \textwidth{\hss\vrule width 0.25\textwidth height 0.2pt depth 0.2pt\hss}
    \vss
  }\vskip5ex
}

\begin{document}

\blindtext[2]

\mybreak

some text some text some text some text some text some text some text

\mybreak

some text some text some text some text some text some text some text

\end{document}

Answer 2

From an old solution of mine that can be used here too (https://tex.stackexchange.com/a/396216/120578) (I used your command combined with mine):

\documentclass[paper=a5]{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage{blindtext}

\newsavebox{\mybottombox} % Box to save the text of the command 
\newlength{\mybottomlength} % The length of our text inside the command
\newlength{\availafter} % The available length left on the page after placing our text

% Optional argument is the minimum length after the nobottom text for not pagebreak. Change it to your needs
\newcommand{\nobottom}[2][40pt]{\savebox{\mybottombox}{\vbox{#2}}\setlength{\mybottomlength}{\ht\mybottombox}%
\setlength{\availafter}{\dimexpr\textheight-\mybottomlength-\pagetotal\relax}\ifdim\availafter<#1%
\pagebreak%\noindent\usebox{\mybottombox}%
\else%
\noindent\usebox{\mybottombox}%
\fi%
}%

\newcommand{\mycommand}[1]{%
  #1\vspace{.1ex}\par%
  \nobottom{\noindent\begin{center}\rule{.25\textwidth}{0.4pt}\end{center}\vspace{.1ex}}%
}

\begin{document}

\mycommand{\blindtext[2]}
\mycommand{some text some text some text some text some text some text some text}
\mycommand{some text some text some text some text some text some text some text}
\end{document}

Output:

I just not adding the line if it is at the bottom of the page. The bottom, is defined in the optional argument of my command \nobottom and for the example I used 40pt.

We can also give my optional argument as optional to your command too if needed for specific paragraphs.