% !TEX TS-program = LuaLaTeX
% From mitthesis package
% Documentation: https://ctan.org/pkg/mitthesis

\ProvidesFile{mydesign_libertinus_headings.tex}[2026/01/27 v1.01]

% ==> you can change this however you want. The content below is just for illustration. <==

% This illustration assumes that the fontset=libertinus is selected under >> lualatex <<.
%	 Chapter and section headings are use additional font features (historical ligatures and stylistic alternates)
%	 Caption labels are set in a boldface font.
%
%	 To avoid distracting typographic design, you may want to limit the additional font features to the chapter headings only.
%
% See: https://github.com/alerque/libertinus/blob/a6487570b8fdcfa69557744f5e5c5d044de0a9db/documentation/Opentype-Features.pdf


%%%%%%%%%  Issue error if running pdftex %%%%%%%%%%%%%%%%%%%
 
% Expl Syntax are already on at this point in mitthesis.cls 
\sys_if_engine_pdftex:T  
	{ 
	   	  \msg_new:nnn  { \ClassName } { wrong_engine } { Run~lualatex,~not~pdftex,\iow_newline: with~mydesign_libertinus_headings!}
		  \msg_error:nn { \ClassName } { wrong_engine }
	}
% Note: when expl syntax are in effect, spaces are ignored (if you need text use ~ separator as above.)


%%%%%%%%%%  Color support  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%% Color package: xcolor. 
%% Change this if you prefer something else

\usepackage[dvipsnames,svgnames,x11names]{xcolor}

%% can add option [table] to xcolor to use color in tables (see xcolor documentation)


%%%%%%%%%%  Hyperlink and line number colors  %%%%%%%%%%%%%%

\AtBeginDocument{
    % Using color names from xcolor package
    \hypersetup{
    	linkcolor=Blue3,
    	citecolor=Blue3,
    	urlcolor=violet,
    	filecolor=red, 
%    	anchorcolor=yellow,%  not all pdf viewers recognize this field (although Firefox does): hyperref issues a warning, which can be ignored
    	}
    %
    \ifmit@lineno
	    \renewcommand{\linenumberfont}{\sffamily\mdseries\tiny\color{violet}}% line numbers will be sans-serif, medium weight, tiny, and violet
	\fi
}

%%%%%%%%%  Caption support  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 
\IfFormatAtLeastTF{2025/11/01}
{
    %% If your latex format is at least 2025/11/01, you should use this approach:
    \NewSocketPlug{caption/label}{plug-A}{{\textbf{ #1}\quad}} % This strictly addresses the caption label, not caption text.
    \AssignSocketPlug{caption/label}{plug-A}
    %
    % \AddToHook{cmd/@makecaption/before}{\relax} % Contents of second argument would style the entire caption, but label socket above can override it in the label.
    %
    % These commands make caption label bold, with a space of one quad separating label from text; the hook command is empty.
}{
    %% For older formats, use the following. See documentation of caption package for details.
    \RequirePackage{caption}
    %% This sets caption labels in bold face type. 
    	\DeclareCaptionLabelFormat{boldlabel}{\textbf{{#1\ #2}}}
    	\captionsetup[figure]{labelformat=boldlabel,labelsep=quad}% change to boldface label with separation of one \quad
    	\captionsetup[table]{labelformat=boldlabel,labelsep=quad} % change to boldface label with separation of one \quad
}

%%%%%%%%%  Customize titles and section headings  %%%%%%%%%%

\ifpdftex\providecommand*{\addfontfeatures}[1]{\relax}\fi

%% This forces the fontset to libertinus.
% Expl Syntax are already on at this point in mitthesis.cls 
\str_if_eq:VnF \mit@fontset {libertinus}
	{ 
		\str_gset:Nn \mit@fontset {libertinus}
	}
% Expl Syntax are on at this point in mitthesis.cls. Don't turn them off!! 

%%  See: https://github.com/alerque/libertinus/blob/a6487570b8fdcfa69557744f5e5c5d044de0a9db/documentation/Opentype-Features.pdf

%% Adds some font features to numbered chapter heading: special versions of J, K, R (ss02); two "historical" ligatures (hlig); stylistic alternate characters (salt).
\patchcmd{\@makechapterhead}{\Huge}{\addfontfeatures{RawFeature={+hlig,+ss02,+salt}}\Huge}{}{}
\patchcmd{\@makechapterhead}{\huge}{\addfontfeatures{RawFeature={+hlig,+ss02,+salt}}\huge}{}{}

%% Adds some font features to UNnumbered chapter names: special versions of J, K, R (ss02); two "historical" ligatures (hlig); stylistic alternate characters (salt).
\patchcmd{\@makeschapterhead}{\Huge}{\addfontfeatures{RawFeature={+hlig,+ss02,+salt}}\Huge}{}{}


% To directly modify section headings as follows, see https://latexref.xyz/dev/latex2e.html#g_t_005c_0040startsection
% This adds the same fontfeatures section, subsection, and subsubsection headings (compare to report.cls)
% Note - libertinus-math has bold characters, but not a boldface math font (so don't use \mathversion{bold})
\renewcommand\section{\@startsection {section}{1}{\z@}%
                                   {-3.5ex \@plus -1ex \@minus -.2ex}%
                                   {2.3ex \@plus.2ex}%
                                   {\addfontfeatures{RawFeature={+hlig,+ss02,+salt}}\Large\bfseries\raggedright}}
\renewcommand\subsection{\@startsection{subsection}{2}{\z@}%
                                     {-3.25ex\@plus -1ex \@minus -.2ex}%
                                     {1.5ex \@plus .2ex}%
                                     {\addfontfeatures{RawFeature={+hlig,+ss02,+salt}}\large\bfseries\raggedright}}
\renewcommand\subsubsection{\@startsection{subsubsection}{3}{\z@}%
                                     {-3.25ex\@plus -1ex \@minus -.2ex}%
                                     {1.5ex \@plus .2ex}%
                                     {\addfontfeatures{RawFeature={+hlig,+ss02,+salt}}\normalsize\bfseries}}


%%%%%%%%%  Change page margins  %%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 
% The default thesis margin is 1 inch all around. You may want different margins (e.g., to add a gutter for binding),
% in which case you can use the \newgeometry command from the geometry package.  Refer to the package documentation
% for details.
%
% mitthesis defaults: [top=1in,bottom=1in,left=1in,right=1in,marginparwidth=50pt,headsep=12pt,footskip=0.5in]
%
% The following tells the geometry package to use a two-sided layout with a 1 cm binding offset on the inside 
% 	and 1 inch margins all around, reducing textwidth slightly (by 0.7 cm). See geometry documentation, Section 8.2.
%
%\newgeometry{twoside, bindingoffset=1cm,margin=1in,marginparwidth=50pt,headsep=12pt,footskip=0.5in}