Having the arsclassica titles shape using classicthesis

Question

I am using classicthesis and I would like to customize the shape of the titles in the way arsclassica does. How can I do it ? This is a view of what I am searching for :

This is my preamble :

 `% book example for classicthesis.sty
\documentclass[11pt,a4paper,footinclude=true,headinclude=true]{scrbook} % KOMA-Script book
\usepackage[T1]{fontenc}

\usepackage[applemac]{inputenc}

\usepackage[frenchb]{babel}
\usepackage{setspace} 
\usepackage{hyperref} 
\usepackage{epigraph} 
\usepackage[tight,french]{minitoc}
\usepackage{apacite}
\usepackage{lipsum}
\usepackage[parts,pdfspacing,dottedtoc,eulerchapternumbers]{../classicthesis} %,manychapters
%\usepackage[osf]{libertine}
\usepackage{epigraph}
\renewcommand\textflush{flushright}


\usepackage{etoolbox}
\makeatletter
\newlength\epitextskip
\pretocmd{\@epitext}{\em}{}{}
\apptocmd{\@epitext}{\em}{}{}
\patchcmd{\epigraph}{\@epitext{#1}\}{\@epitext{#1}\[\epitextskip]}{}{}
\makeatother

\setlength\epigraphrule{0pt}
\setlength\epitextskip{2ex}
\setlength\epigraphwidth{.8\textwidth}

\FrenchFootnotes
\usepackage{amsthm}
\usepackage{lineno}
\setcounter{tocdepth}{3}
\setcounter{secnumdepth}{3}
\AtBeginDocument{\renewcommand{\thepart}{\Roman{part}}}
\frontmatter

%%%%%%%%%%%%%%%%%%%%%%%modifie la taille des numéros de     chapitres%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ifthenelse{\boolean{@eulerchapternumbers}}% font for the chapter numbers
{\newcommand\mychapterNumber{\fontencoding{U}\fontfamily{eur}\fontseries{b}\fontsize{28}  {29}\selectfont}}%
{\newcommand\mychapterNumber{\fontencoding{T1}\fontfamily{pplj}\fontsize{25}{26}\selectfont}}

\ifthenelse{\boolean{@linedheaders}}%
{%
\titleformat{\chapter}[block]%
    {\relax}{\titlerule\vspace*{.9\baselineskip}\\raggedleft{\color{halfgray}\mychapterNumber\thechapter}}{1.2em}%
    {\raggedright\spacedallcaps}[\normalsize\vspace*{.8\baselineskip}\titlerule]%
}{%
\titleformat{\chapter}[block]%
    {\relax}{{\color{halfgray}\mychapterNumber\thechapter}}{1.2em}%
    {\raggedright\spacedallcaps}[\normalsize\vspace*{.8\baselineskip}\titlerule]%
    }
    \begin{document}
%   \pagestyle{scrheadings}
%   \manualmark
%   \markboth{\spacedlowsmallcaps{\contentsname}}{\spacedlowsmallcaps{\contentsname}}

\pagestyle{scrheadings}`<code>

Answer 1

Copy the code from line 81 to 146 inclusive of arsclassica.sty and paste it into your preamble, removing all \sffamily commands.

Remove the setting to \descriptionlabel, which is in that part of the code, but really doesn't belong there, and redefine \chapterNumber.

\documentclass[11pt,a4paper,footinclude=true,headinclude=true]{scrbook} % KOMA-Script book
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[frenchb]{babel}

\usepackage[parts,pdfspacing,dottedtoc,eulerchapternumbers]{classicthesis} %,manychapters

\usepackage{lipsum}
\usepackage{hyperref} 

\makeatletter % <---- important
%%% from arsclassica.sty
% parts
    \ifthenelse{\boolean{@parts}}%
        {%
    \titleformat{\part}[display]
        {\normalfont\centering\large}%
        {\thispagestyle{empty}\partname~\MakeTextUppercase{\thepart}}{1em}%
        {\color{Maroon}\spacedallcaps}
    }{\relax}
    % chapters
    \ifthenelse{\boolean{@linedheaders}}%
    {%
    \titleformat{\chapter}[display]%             
        {\relax}{\raggedleft{\color{halfgray}%
        \chapterNumber\thechapter} \\ }{0pt}%
        {\titlerule\vspace*{.9\baselineskip}\raggedright%
        \spacedallcaps}%
        [\normalsize\vspace*{.8\baselineskip}\titlerule]%
    }{%  
    \titleformat{\chapter}[block]%
        {\normalfont\Large}%
        {{\color{halfgray}\chapterNumber\thechapter%
        \hspace{10pt}\vline}  }{10pt}%
        {\spacedallcaps}}
    % sections
    \titleformat{\section} 
          {\normalfont\Large}{\textsc%
          {\MakeTextLowercase{\thesection}}}%
         {1em}{\spacedlowsmallcaps}
    % subsections
    \titleformat{\subsection}
        {\normalfont}{\textsc{\MakeTextLowercase%
        {\thesubsection}}}{1em}{\normalsize}
    % subsubsections
    \titleformat{\subsubsection}
        {\normalfont\itshape}{\textsc%
        {\MakeTextLowercase{\thesubsubsection}}}%
        {1em}{\normalsize\itshape}        
    % paragraphs
    \titleformat{\paragraph}[runin]
        {\normalfont\normalsize}{\textsc%
        {\MakeTextLowercase{\theparagraph}}}%
        {0pt}{\spacedlowsmallcaps}
    % descriptionlabels
    \renewcommand{\descriptionlabel}[1]{\hspace*{\labelsep}%
    \bfseries\spacedlowsmallcaps{#1}}
    \titlespacing*{\chapter}{0pt}{1\baselineskip}%
    {2\baselineskip}
    \titlespacing*{\section}{0pt}{2\baselineskip}%
    {.8\baselineskip}[\marginparsep]
    \titlespacing*{\subsection}{0pt}{1.5\baselineskip}%
    {.8\baselineskip}[\marginparsep]
    \titlespacing*{\paragraph}{0pt}{1\baselineskip}%
    {1\baselineskip}
    %
    \newcommand\formatchapter[1]{% 
    \vbox to \ht\strutbox{ 
    \setbox0=\hbox{\chapterNumber\thechapter\hspace{10pt}\vline\ } 
    \advance\hsize-\wd0 \advance\hsize-10pt\raggedright 
    \spacedallcaps{#1}\vss}} 
    \titleformat{\chapter}[block] 
       {\normalfont\Large} 
       {\textcolor{halfgray}{\chapterNumber\thechapter} 
       \hspace{10pt}\vline\ }{10pt} 
    {\formatchapter}    
        %
        \if@twoside\rofoot[\mbox{\makebox[0pt][l]{\kern1em\thepage}}]{}\fi
\makeatother % <----- important

\renewcommand\chapterNumber{\fontsize{50}{0}\usefont{U}{eur}{b}{n}}

\pagestyle{scrheadings}

\begin{document}
\mainmatter

\chapter{Ouverture}

\lipsum

\end{document}

If all you want is changing the chapter headings, remove all that doesn't refer to chapters.

Here's the reduced version:

\documentclass[11pt,a4paper,footinclude=true,headinclude=true]{scrbook} % KOMA-Script book
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[frenchb]{babel}

\usepackage[parts,pdfspacing,dottedtoc,eulerchapternumbers]{classicthesis} %,manychapters

\usepackage{lipsum}
\usepackage{hyperref} 

\makeatletter
%%% from arsclassica.sty
\titlespacing*{\chapter}
  {0pt}
  {1\baselineskip}
  {2\baselineskip}

\newcommand\formatchapter[1]{% 
  \vbox to \ht\strutbox{ 
    \setbox0=\hbox{\chapterNumber\thechapter\hspace{10pt}\vline\ } 
    \advance\hsize-\wd0 \advance\hsize-10pt\raggedright 
    \spacedallcaps{#1}\vss}}

\titleformat{\chapter}[block]
  {\normalfont\Large}
  {\textcolor{halfgray}{\chapterNumber\thechapter} \hspace{10pt}\vline\ }
  {10pt}
  {\formatchapter}    

\if@twoside\rofoot[\mbox{\makebox[0pt][l]{\kern1em\thepage}}]{}\fi
\makeatother

\renewcommand\chapterNumber{\fontsize{50}{0}\usefont{U}{eur}{b}{n}}

\pagestyle{scrheadings}

\begin{document}
\mainmatter

\chapter{Ouverture}

\lipsum

\end{document}