% Turabian Formatting for LaTeX
%
% Based on Kate L. Turabian's "A Manual for Writers of Research Papers, Theses, 
% and Dissertations," 9th edition.
%
% ==============================
% Copyright 2013-2021 Omar Abdool
%
% This work may be distributed and/or modified under the conditions of the LaTeX
% Project Public License (LPPL), either version 1.3 of this license or (at your
% option) any later version.
%
% The latest version of this license is in:
%	http://www.latex-project.org/lppl.txt
% and version 1.3 or later is part of all distributions of LaTeX version
% 2005/12/01 or later.
%
% LPPL Maintenance Status: maintained (by Omar Abdool)
%
% This work consists of the files: turabian-formatting.sty,
% turabian-researchpaper.cls, turabian-thesis.cls, turabian-formatting-doc.tex,
% and turabian-formatting-doc.pdf (in addition to the README file).
%
% ==============================
%
%


\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{turabian-formatting}[2021/03/20 Turabian Formatting]


% Package options: flags and variables

\newif\if@optraggedright\@optraggedrighttrue

\newif\if@authordateformat\@authordateformatfalse

\newif\if@appendbibformat\@appendbibformattrue

\newif\if@endnotesformat\@endnotesformatfalse


% Package options: handling

\DeclareOption{noraggedright}{\@optraggedrightfalse}

\DeclareOption{authordate}{\@authordateformattrue}

\DeclareOption{noadjustbib}{\@appendbibformatfalse}

\DeclareOption{endnotes}{\@endnotesformattrue}

\ProcessOptions\relax


\RequirePackage{etoolbox}


% Margin size: 1 inch on all sides
\setlength\textwidth{\dimexpr \paperwidth -2in \relax}
\setlength\hoffset{\z@}

\setlength\textheight{\dimexpr \paperheight -2in \relax}
\setlength\voffset{\z@}

\setlength\oddsidemargin{\z@}
\setlength\evensidemargin{\z@}

% Header top and footer baseline: set to 0.5in from page edges
\setlength\topmargin{-0.5in}
\setlength\headheight{\dimexpr \f@size pt \relax}
\setlength\headsep{\dimexpr 0.5in -\headheight \relax}

\setlength\footskip{0.5in}

% Text spacing is double-spaced
\RequirePackage{setspace}
\setstretch{2}


% Preserve normalsize and footnotesize single-spacing baselineskip values
\newlength\tf@singlelineskip
\newlength\tf@fnsinglelineskip

\ifcase \@ptsize
	\setlength\tf@singlelineskip{12pt}
	\setlength\tf@fnsinglelineskip{9.5pt}
\or
	\setlength\tf@singlelineskip{13.6pt}
	\setlength\tf@fnsinglelineskip{11pt}
\or
	\setlength\tf@singlelineskip{14.5pt}
	\setlength\tf@fnsinglelineskip{12pt}
\fi


% Paragraph indent
\setlength\parindent{0.5in}

% Renew \raggedright to preserve paragraph indent
\def\raggedright{%
	\let\\\@centercr\@rightskip\@flushglue \rightskip\@rightskip
	\leftskip\z@skip}

% Use \raggedright if raggedright option true
\if@optraggedright \raggedright \fi

% Prevent widowed text with 2 line default
\PassOptionsToPackage{defaultlines=2, all}{nowidow}
\AtEndPreamble{%
	\@ifpackageloaded{nowidow}%
		{}%
		{\RequirePackage{nowidow}}}


% Footnotes: layout and formatting

\PassOptionsToPackage{bottom, marginal}{footmisc}
\if@endnotesformat
	\PassOptionsToPackage{perpage}{footmisc}
\fi

\RequirePackage{footmisc}

\setlength\footnotemargin{\parindent}

% Footnotes: Chicago symbols used when needed
\setfnsymbol{chicago}

% Footnotes: separation between footnotes based on text size
\ifcase \@ptsize
	\setlength\footnotesep{16.65pt}
\or
	\setlength\footnotesep{18.7pt}
\or
	\setlength\footnotesep{20.4pt}
\fi

\setlength{\skip\footins}{\footnotesep}

% Footnotes: readjust footnote rule size and placement
\renewcommand{\footnoterule}{%
	\kern-3\p@
	\hrule \@width 2in height 0.4\p@
	\kern-4\p@}

% Footnotes: set default footnote punctuation
\def\tf@thefnpunct{.\,\,}

% Footnotes: renew command for typesetting footnotes
\renewcommand{\@makefntext}[1]{%
	\if@optraggedright \raggedright \fi
	\setlength\parindent{\footnotemargin}%
	\setlength\tf@singlelineskip{\tf@fnsinglelineskip}%
	\@thefnmark\tf@thefnpunct#1}


% Page style (headings): place page number in header, top right
\def\ps@headings{%
	\let\@oddfoot\@empty
	\let\@evenfoot\@empty
	\def\@evenhead{\thepage}
	\def\@oddhead{\hfil\thepage}
	\let\@mkboth\@gobbletwo
	\let\markboth\@mkboth
	\let\chaptermark\@gobble
	\let\sectionmark\@gobble}

% Page style (myheadings): make same as headings page style 
\let\ps@myheadings\ps@headings

% Page style (headings): set default page style and page numbering
\pagestyle{headings}
\pagenumbering{arabic}

% Page style (empty): adjust if twoside option used
\if@twoside
	\def\cleardoublepage{%
		\clearpage
		\ifodd \c@page \else
			\hbox{}
			\thispagestyle{empty}
			\newpage
		\fi}
\fi


% Set top section command name to "section" (default)
\def\tf@topsecname{section}

% Redefine \@afterheading to adjust for baselineskip after headings
\def\tf@adjaftersec{\dimexpr \baselineskip -\tf@singlelineskip \relax}
\let\tf@tempafterheading\@afterheading
\def\@afterheading{\vskip -\tf@adjaftersec\relax \tf@tempafterheading}

% Headings formatting: \section, \subsection, and \subsubsection
\setcounter{secnumdepth}{0}

\renewcommand{\section}{%
	\@startsection{section}{1}%
		{\z@}%
		{2\tf@singlelineskip}%
		{\tf@singlelineskip}%
		{\normalfont\bfseries\normalsize\centering}}

\renewcommand{\subsection}{%
	\@startsection{subsection}{2}%
		{\z@}%
		{2\tf@singlelineskip}%
		{\tf@singlelineskip}%
		{\normalfont\mdseries\normalsize\centering}}

\renewcommand{\subsubsection}{%
	\@startsection{subsubsection}{3}%
		{\z@}%
		{2\tf@singlelineskip}%
		{\tf@singlelineskip}%
		{\normalfont\bfseries\normalsize\raggedright}}

% Sections: section heading formatting
\def\tf@makesectionhead#1#2#3#4#5{%
	\vskip -\tf@singlelineskip\relax
	\begingroup
		\singlespacing
		#4{%
			\@hangfrom{\hskip #3\relax\@svsec}%
			\interlinepenalty \@M #5\@@par}%
	\endgroup}

% Sections: formatting of TOC \addcontentsline
\def\tf@tocline#1#2{\protect{\csname the#1\endcsname\quad}}

% Sections: redefine \@sect to use \tf@makesectionhead and \tf@tocline
\def\@sect#1#2#3#4#5#6[#7]#8{%
	\ifnum #2>\c@secnumdepth
		\let\@svsec\@empty
	\else
		\refstepcounter{#1}%
		\protected@edef\@svsec{\@seccntformat{#1}\relax}%
	\fi
	\@tempskipa #5\relax
	\ifdim \@tempskipa>\z@
		\tf@makesectionhead{#1}{#2}{#3}{#6}{#8}
		\csname #1mark\endcsname{#7}%
		\addcontentsline{toc}{#1}{%
			\ifnum #2>\c@secnumdepth \else \tf@tocline{#1}{#2} \fi #7}%
	\else
		\def\@svsechd{%
			#6{\hskip #3\relax \@svsec #8}%
			\csname #1mark\endcsname{#7}%
			\addcontentsline{toc}{#1}{%
				\ifnum #2>\c@secnumdepth \else \tf@tocline{#1}{#2} \fi #7}}%
	\fi
	\@xsect{#5}}

% Sections: redefine \@ssect
\def\@ssect#1#2#3#4#5{%
	\@tempskipa #3\relax
	\ifdim \@tempskipa>\z@
		\vskip -\tf@singlelineskip\relax
		\begingroup
			\singlespacing
			#4{%
				\@hangfrom{\hskip #1}%
				\interlinepenalty \@M #5\@@par}%
		\endgroup
	\else
		\def\@svsechd{#4{\hskip #1\relax #5}}%
	\fi
	\@xsect{#3}}


% Table of Contents: set adjustment for baselineskip after toc heading
\def\tf@adjaftersectoc{%
	\vspace{\dimexpr \baselineskip -3\tf@singlelineskip \relax}}

% Table of Contents: \@starttoc formatting hook
\def\tf@starttocformat{\singlespacing}

\renewcommand{\tableofcontents}{%
	\expandafter\csname \tf@topsecname\endcsname*{\contentsname}%
	\@mkboth{}{}%
	\if@optraggedright
		\let\tf@tocrmarg\@tocrmarg
		\def\@tocrmarg{\tf@tocrmarg plus1fil}
	\fi
	\tf@adjaftersectoc
	{\tf@starttocformat\@starttoc{toc}}}%


% List of Figures and List of Tables: adjust titles
\renewcommand{\listfigurename}{Figures}
\renewcommand{\listtablename}{Tables}

\AtEndPreamble{
	\@ifpackageloaded{polyglosia}%
		{%
			\addto\captionsenglish{%
				\renewcommand{\listfigurename}{Figures}
				\renewcommand{\listtablename}{Tables}}%
		}{}
	\@ifpackageloaded{babel}%
		{%
			\addto\captionsenglish{%
				\renewcommand{\listfigurename}{Figures}
				\renewcommand{\listtablename}{Tables}}%
		}{}}

% List of Figures
\renewcommand{\listoffigures}{%
	\expandafter\csname \tf@topsecname\endcsname*{\listfigurename}%
	\@mkboth{}{}%
	\addcontentsline{toc}{\tf@topsecname}{\listfigurename}%
	\tf@adjaftersectoc
	{\tf@starttocformat\@starttoc{lof}}}

% List of Tables
\renewcommand{\listoftables}{%
	\expandafter\csname \tf@topsecname\endcsname*{\listtablename}%
	\@mkboth{}{}%
	\addcontentsline{toc}{\tf@topsecname}{\listtablename}%
	\tf@adjaftersectoc
	{\tf@starttocformat\@starttoc{lot}}}

% List of Illustrations
\newcommand{\listillustrationname}{Illustrations}
\def\tf@illustrsection{\normalfont\bfseries\normalsize\singlespacing\noindent}

\newcommand{\listofillustrations}{%
	\expandafter\csname \tf@topsecname\endcsname*{\listillustrationname}%
	\@mkboth{}{}%
	\addcontentsline{toc}{\tf@topsecname}{\listillustrationname}%
	\tf@adjaftersectoc
	{	\tf@starttocformat
		{\tf@illustrsection Figures}\par\nopagebreak
		\@starttoc{lof}
		\vspace{\tf@singlelineskip}
		{\tf@illustrsection Tables}\par\nopagebreak
		\@starttoc{lot}}}


% Figures and Tables: float positioning
\setlength\textfloatsep{%
	\dimexpr 2\tf@singlelineskip +\p@ \relax minus 1\tf@singlelineskip}
\setlength\floatsep{%
	\dimexpr 1\tf@singlelineskip +\p@ \relax plus 1\tf@singlelineskip}
\setlength\intextsep{%
	\dimexpr 1\tf@singlelineskip +\p@ \relax plus 1\tf@singlelineskip}

\def\fps@table{!htb}
\def\fps@figure{!htb}

% Figures and Tables: caption formatting
\setlength\abovecaptionskip{\z@}
\setlength\belowcaptionskip{\z@}

\long\def\@makecaption#1#2{%
	\vskip\abovecaptionskip
	\if@optraggedright \raggedright \fi
	\small#1. #2\par
	\vskip\belowcaptionskip}

% Lists: enumerate and itemize formatting
\setlength\leftmargini{1.5\parindent}
\setlength\leftmargin{\leftmargini}
\setlength\leftmarginii{\parindent}
\setlength\leftmarginiii{\parindent}
\setlength\leftmarginiv{\parindent}
\setlength\labelsep{.65em}
\setlength\labelwidth{\dimexpr \parindent -\labelsep \relax}

% Lists: formatting command for both enumerate and itemize
\def\tf@listformat{%
	\setlength\topsep{\z@}
	\setlength\itemsep{\z@}
	\setlength\parsep{\z@}
	\setlength\listparindent{\parindent}}

% Lists (enumerate): format of enumerate list labels
\renewcommand{\labelenumi}{\arabic{enumi}.}
\renewcommand{\labelenumii}{\alph{enumii})}
\renewcommand{\labelenumiii}{(\arabic{enumiii})}
\renewcommand{\labelenumiv}{(\alph{enumiv})}

% Lists (enumerate): redefine enumerate to include formatting command hook
\def\tf@enumerateformat{\tf@listformat}
\def\enumerate{%
	\ifnum \@enumdepth >\thr@@\@toodeep \else
		\advance\@enumdepth\@ne
		\edef\@enumctr{enum\romannumeral\the\@enumdepth}%
		\expandafter
		\list
			\csname label\@enumctr\endcsname
			{\usecounter\@enumctr%
			\def\makelabel##1{\hss\llap{##1}}%
			\tf@enumerateformat}%
	\fi}

% Lists (itemize): redefine itemize to include formatting command hook
\def\tf@itemizeformat{\tf@listformat}
\def\itemize{%
	\ifnum \@itemdepth >\thr@@\@toodeep \else
		\advance\@itemdepth\@ne
		\edef\@itemitem{labelitem\romannumeral\the\@itemdepth}%
		\expandafter
		\list
			\csname\@itemitem\endcsname
			{\def\makelabel##1{\hss\llap{##1}}%
			\tf@itemizeformat}%
	\fi}


% Block quotation: formatting
\renewenvironment{quotation}
	{%
		\list{}{%
			\setlength\listparindent{\parindent}
			\setlength\itemindent{\listparindent}
			\setlength\leftmargin{\parindent}
			% Adjust right margin based on raggedright option
			\if@optraggedright
				\setlength\rightmargin{\z@}
			\else
				\setlength\rightmargin{\leftmargin}
			\fi
			\setlength\parsep{\z@}
			\setlength\topsep{\dimexpr 2\tf@singlelineskip -\baselineskip \relax}}%
		\singlespacing%
		\item\relax\noindent\ignorespaces%
	}
	{\endlist}
\def\quote{\quotation}


% thebibliography environment: formatting (adjust \@openbib@code hook default)
\setlength\bibindent{\parindent}

\renewcommand\@openbib@code{%
	\singlespacing
	\setlength\leftmargin{\bibindent}
	\setlength\itemindent{\dimexpr -\bibindent +\labelsep +\labelwidth \relax}
	\setlength\itemsep{\tf@singlelineskip}
	\setlength\parsep{\z@}}


% biblatex-chicago: set formatting defaults and pass options
\PassOptionsToPackage%
	{isbn=false, autolang=other, footmarkoff, backend=biber}%
	{biblatex-chicago}
\if@authordateformat
	\PassOptionsToPackage{authordate}{biblatex-chicago}
\fi

% biblatex-chicago: adjustments to \printbibliography formatting
\if@appendbibformat
	\AtEndPreamble{%
		\@ifpackageloaded{biblatex}%
			{%
				\if@authordateformat
					\DefineBibliographyStrings{english}{%
						bibliography = {References}}
				\else
					\DefineBibliographyStrings{english}{%
						references = {Bibliography}}
				\fi
				\renewcommand{\bibitemsep}{\tf@singlelineskip}
				\renewcommand{\bibhang}{0.5in}
				\renewcommand{\bibsetup}{%
					\vskip \tf@adjaftersec\relax
					\vskip -\tf@singlelineskip\relax
					\singlespacing}%
			}{}}
\fi


% Endnotes: support and formatting
\if@endnotesformat

	\RequirePackage{endnotes}

	% Changes footnote marker type and formatting
	\def\tf@thefnpunct{\,\,}
	\renewcommand*{\thefootnote}{\fnsymbol{footnote}}

	\PassOptionsToPackage{notetype=endonly}{biblatex-chicago}
	
	% Create \jobname.ent to avoid missing file error
	\@openenotes

	% Set default endnotes formatting
	\renewcommand{\enotesize}{\normalsize}
	\renewcommand{\enoteformat}{%
		\singlespacing
		\if@optraggedright \raggedright \fi
		\setlength\parindent{\footnotemargin}
		\theenmark.\,\,}

\else

	% Define \theendnotes if endnotes package not loaded
	\@ifpackageloaded{endnotes}%
		{}%
		{\def\theendnotes{\@empty}}

\fi