Headsepline next to chapter and section title instead of below

Question

In this thesis - made with the memoir class - the author uses headseplines next to the header content instead of below:

Is it possible to achieve the same with KOMAscript and scrlayer-scrpage, for both the even pages with the chapter title and the odd pages with the section title?

Unlike the linked example I'd like to get:

even page:

chapter title _________________________________________________

odd page:

__________________________________ section number section title

Page numbers are not relevant, as they are in the footer.

---

Here a MWE to play with:

\documentclass{scrbook}

\RequirePackage[headsepline,automark]{scrlayer-scrpage}

\renewcommand*{\chaptermarkformat}{\scshape}
\KOMAoption{headsepline}{0.1pt}
\pagestyle{scrheadings}

\usepackage{blindtext}

\begin{document}

\chapter{Hello World!}
\section{Section One}
\blindmathpaper
\blindmathpaper
\blindmathpaper

\end{document} 

---

I tried to abolish the headsepline and modify the \chaptermarkformat and \sectionmarkformat using hrulefill, which seems to be a good way. But I can't get it right.

\documentclass{scrbook}

\RequirePackage[automark]{scrlayer-scrpage}

\renewcommand*{\chaptermarkformat}[1]{\scshape \hspace{2ex} \hrulefill}

(chapter name should be on left side, spacing wrong)

---

With

\renewcommand*{\sectionmarkformat}[1]{\hrulefill \hspace{2ex} \thesection \hspace{1ex} \rightmark }

the odd page looks all right, but it seems to me that it should be done a little different. E.g. why do I need set the spacing manually here: \thesection \hspace{1ex} \rightmark

Answer 1

Here is a suggestion using \hrulefill

\documentclass{scrbook}
\usepackage[automark]{scrlayer-scrpage}

\lehead{\headmark{} \hrulefill}
\rohead{\hrulefill{} \headmark}

\renewcommand*{\chaptermarkformat}{}
\addtokomafont{pagehead}{\scshape}

\usepackage{blindtext}

\begin{document}
\Blinddocument
\end{document}

---

Or if you want to use the headmarks=.1pt option:

\documentclass{scrbook}
\usepackage{xcolor}
\usepackage[automark,headsepline=.1pt]{scrlayer-scrpage}

\RemoveLayersFromPageStyle{scrheadings}{scrheadings.head.below.line}
\DeclareNewLayer[
  clone=scrheadings.head.odd,
  contents={\GetLayerContents{scrheadings.head.below.line}}
]{scrheadings.head.odd.line}
\DeclareNewLayer[
  clone=scrheadings.head.odd.line,
  evenpage
]{scrheadings.head.even.line}
\AddLayersToPageStyleBeforeLayer{scrheadings}%
  {scrheadings.head.odd.line}{scrheadings.head.odd}
\AddLayersToPageStyleBeforeLayer{scrheadings}%
  {scrheadings.head.even.line}{scrheadings.head.even}

\lehead{\setlength\fboxsep{0pt}\colorbox{white}{\headmark\strut\enskip}}
\rohead{\setlength\fboxsep{0pt}\colorbox{white}{\enskip\headmark\strut}}

\renewcommand*{\chaptermarkformat}{}
\addtokomafont{pagehead}{\scshape}

\usepackage{blindtext}

\begin{document}
\Blinddocument
\end{document}