\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{classwork}[2018/11/28 Kogasa's Classwork Class]

\LoadClass{article}

%Margins
%\usepackage[margin=1in]{geometry}
\usepackage[DIV=10,BCOR=2mm,headinclude=true,footinclude=false]{typearea}

%Typical packages
\usepackage{amsmath,amsthm,amssymb,amsfonts,multicol,afterpage,fancyhdr,environ,enumerate,turnstile,titling,xparse}

%FONTS
%-------------------------
%https://tex.stackexchange.com/questions/82001/microtype-settings-for-dummies
%http://www.khirevich.com/latex/microtype/
\usepackage[activate={true,nocompatibility},final,tracking=true,kerning=true,spacing=true, factor=1100,stretch=10,shrink=10]{microtype}
\usepackage[T1]{fontenc}

%Prevents odd spacing message
\microtypecontext{spacing=nonfrench}

\SetProtrusion{encoding={*},family={*}, series={*},size={6,7}}
              {1={ ,750},2={ ,500},3={ ,500},4={ ,500},5={ ,500},
               6={ ,500},7={ ,600},8={ ,500},9={ ,500},0={ ,500}}

\SetExtraKerning[unit=space]
    {encoding={*}, family={*}, series={*}, size={footnotesize,small,normalsize}}
    {\textendash={400,400}, % en-dash, add more space around it
     "28={ ,150}, % left bracket, add space from right
     "29={150, }, % right bracket, add space from left
     \textquotedblleft={ ,150}, % left quotation mark, space from right
     \textquotedblright={150, }} % right quotation mark, space from left

\SetExtraKerning[unit=space]
   {encoding={*}, family={*}, series={b}, size={large,Large}}
   {1={-200,-200},
    \textendash={400,400}}
\SetTracking{encoding={*}, shape=sc}{40}

\makeatletter
\def\@maketitle{%
  \newpage
  \null
  \vskip 2em%
  \begin{center}%
  \let \footnote \thanks
    {\LARGE \bfseries \fontfamily{qhv}\selectfont \@title \par}%
    \vskip 1.5em%
    {\large
      \lineskip .5em%
      \begin{tabular}[t]{c}%
        \fontfamily{qhv}\selectfont \@author
      \end{tabular}\par}%
    \vskip 1em%
    {\large \fontfamily{qhv}\selectfont \@date}
  \end{center}%
  \par
  \vskip 1.5em}
\makeatother

\usepackage{titlesec,tocloft}

\titleformat{\section}[hang]{
    \usefont{T1}{qhv}{b}{n}\selectfont} % "qhv" - TeX Gyre Heros, "b" - bold
    {}
    {0em}
    {\hspace{-0.4pt}\Large \thesection\hspace{0.6em}}

\titleformat{\subsection}{
    \usefont{T1}{qhv}{b}{n}\selectfont} % "qhv" - TeX Gyre Heros, "b" - bold
    {}
    {0em}
    {\hspace{-0.4pt}\large \thesubsection\hspace{0.6em}}

\titleformat{\subsubsection}{
    \usefont{T1}{qhv}{b}{n}\selectfont} % "qhv" - TeX Gyre Heros, "b" - bold
    {}
    {0em}
    {\thesubsubsection\hspace{0.6em}}

\renewcommand{\cfttoctitlefont} % ToC title
             {\usefont{T1}{qhv}{b}{n}\selectfont\huge}
\renewcommand{\cftsecfont} % section titles
             {\usefont{T1}{bch}{b}{n}\selectfont}
\renewcommand{\cftsubsecfont} % subsection titles
             {\usefont{T1}{bch}{m}{n}\selectfont}
\renewcommand{\cftsecpagefont} % section page numbers
             {\cftsecfont}
\renewcommand{\cftsubsecpagefont} % subsection page numbers
             {\cftsubsecfont}
\setcounter{tocdepth}{2}

%Font Families -- https://math.ucsd.edu/~msharpe/RcntFnts.pdf
\usepackage{textcomp}
\usepackage{charter}
%\usepackage[sb]{libertine}
\usepackage[varqu,varl]{zi4}% inconsolata
\usepackage[charter,vvarbb,scaled=1.05]{newtxmath} % bb from STIX
%\usepackage[cal=boondoxo]{mathalfa} % mathcal
%\useosf % osf for text, not math
%\usepackage[supstfm=libertinesups,%
%supscaled=1.2,%
%raised=-.13em]{superiors}

% Allows fonts to be rescaled arbitrarily without error messages
\usepackage{type1ec}

\renewcommand\epsilon{\varepsilon}
%-----------------------


% Useful math shorthand
\newcommand{\N}{\mathbb{N}}
\newcommand{\Z}{\mathbb{Z}}
\newcommand{\R}{\mathbb{R}}
\newcommand{\Q}{\mathbb{Q}}
\newcommand{\C}{\mathbb{C}}
\newcommand{\e}{\mathrm{e}}
\newcommand{\T}{\mathcal{T}}
\newcommand{\B}{\mathcal{B}}
\newcommand{\normal}{\trianglelefteq}

\DeclareMathOperator{\aut}{Aut}
\DeclareMathOperator{\im}{im}
\let\ker\relax
\DeclareMathOperator{\ker}{ker}
\DeclareMathOperator{\lcm}{lcm}


\newcommand\blankpage{%
	\null
	\thispagestyle{empty}%
	\addtocounter{page}{-1}%
	\newpage}

%CODE WILL NOT EXECUTE - OLD ENVIRONMENTS
\iffalse
\ExplSyntaxOn
    \NewDocumentEnvironment{definition} { o }
     { \begin{trivlist}
      \item \IfNoValueTF{#1} {{\fontfamily{qhv}\selectfont\textbf{\small Definition.}}\hskip
      \labelsep}{{\fontfamily{qhv}\selectfont\textbf{\small Definition~(#1).}}\hskip
      \labelsep}
       \ignorespaces
     }
     {\end{trivlist}}
\ExplSyntaxOff

\newenvironment{definition}[2][Definition]{\begin{trivlist}
   		\item[\hskip \labelsep {\bfseries #1}\hskip \labelsep {\bfseries (#2).}]}{\end{trivlist}}
\newenvironment{theorem}[2][Theorem]{\begin{trivlist}
		\item[\hskip \labelsep {{\fontfamily{qhv}\selectfont \small \bfseries #1}}\hskip \labelsep
    {{\fontfamily{qhv}\selectfont \small \bfseries #2.}}]\itshape}{\end{trivlist}}
\newenvironment{corollary}[2][Corollary]{\begin{trivlist}
		\item[\hskip \labelsep {{\fontfamily{qhv}\selectfont \small \bfseries #1}}\hskip \labelsep
    {{\fontfamily{qhv}\selectfont \small \bfseries #2.}}]\itshape}{\end{trivlist}}
\newenvironment{lemma}[2][Lemma]{\begin{trivlist}
		\item[\hskip \labelsep {{\fontfamily{qhv}\selectfont \small \bfseries #1}}\hskip \labelsep
    {{\fontfamily{qhv}\selectfont \small \bfseries #2.}}] \itshape}{\end{trivlist}}
\newenvironment{remark}[1][Remark]{\begin{trivlist}
		\item[\hskip \labelsep {{\fontfamily{qhv}\selectfont \small \itshape #1.}}]}{\end{trivlist}}
\newenvironment{prop}[2][Proposition]{\begin{trivlist}
		\item[\hskip \labelsep {\bfseries #1}\hskip \labelsep {\bfseries #2.}]}{\end{trivlist}}
\newenvironment{exercise}[2][Exercise]{\begin{trivlist}
		\item[\hskip \labelsep {\bfseries #1}\hskip \labelsep {\bfseries #2.}]}{\end{trivlist}}
\newenvironment{problem}[2][Problem]{\begin{trivlist}
		\item[\hskip \labelsep {{\fontfamily{qhv}\selectfont\small\bfseries #1}}\hskip \labelsep
    {{\fontfamily{qhv}\selectfont\small\bfseries #2.}}]}{\medskip \end{trivlist}}
\newenvironment{question}[2][Question]{\begin{trivlist}
		\item[\hskip \labelsep {\bfseries #1}\hskip \labelsep {\bfseries #2.}]}{\end{trivlist}}
\newenvironment{solution}[1][Solution.]{\begin{trivlist}
        \item[\hskip \labelsep {\fontfamily{qhv}\selectfont \small {\bfseries #1}}]}{\qed \end{trivlist}}
\fi
%%

\newtheoremstyle{plainqhv}%
  {}% space above
  {}% space below
  {\itshape}% body font
  {}% indent amount
  {\fontfamily{qhv}\bfseries\small}% theorem head font
  {.}% punctuation after theorem head
  {.5em}% space after theorem head
  {\thmname{#1}\thmnumber{ #2}\thmnote{\normalfont\normalsize\ (#3)}}% theorem head spec (can be left empty, meaning 'normal')

\newtheoremstyle{definitionqhv}%
  {}% space above
  {}% space below
  {}% body font
  {}% indent amount
  {\fontfamily{qhv}\bfseries\small}% theorem head font
  {.}% punctuation after theorem head
  {.5em}% space after theorem head
  {\thmname{#1}\thmnumber{ #2}\thmnote{\normalfont\normalsize\ (#3)}}% theorem head spec (can be left empty, meaning 'normal')

\newtheoremstyle{remarkqhv}%
  {}% space above
  {}% space below
  {}% body font
  {}% indent amount
  {\itshape}% theorem head font
  {.}% punctuation after theorem head
  {.5em}% space after theorem head
  {\thmname{#1}\thmnumber{ #2}\thmnote{ #3}}% theorem head spec (can be left empty, meaning 'normal')

\theoremstyle{plainqhv}
\newtheorem{theorem}{Theorem}[section]
\newtheorem{lemma}[theorem]{Lemma}
\newtheorem{corollary}[theorem]{Corollary}
\newtheorem{proposition}[theorem]{Proposition}

\theoremstyle{definitionqhv}
\newtheorem{definition}[theorem]{Definition}
\newtheorem{problem}{Problem}
\newtheorem{example}[theorem]{Example}
\newtheorem*{observation}{Observation}

\theoremstyle{remarkqhv}
\newtheorem*{remark}{Remark}
\newtheorem*{note}{Note}
\newtheorem*{case}{Case}
\newtheorem{Claim}{Claim}[problem]
\newtheorem{ClaimI}{Claim}[Claim]
\newtheorem{ClaimII}{Claim}[ClaimI]
\newtheorem{ClaimIII}{Claim}[ClaimII]
\newcounter{claimlevel}[theorem]

% nested claims --
% https://tex.stackexchange.com/questions/306016/theorem-and-subtheorem-hierarchical-numbering
\ExplSyntaxOn
\NewDocumentEnvironment{claim}{O{=}}
 {
  \str_case:nn { #1 }
   {
    {=}  { }
    {+}  { \stepcounter{claimlevel} }
    {-}  { \addtocounter{claimlevel}{-1} }
    {--} { \addtocounter{claimlevel}{-2} }
    {---}{ \addtocounter{claimlevel}{-3} }
   }
  \begin{ Claim \int_to_Roman:n { \value{claimlevel} } }
 }
 {
  \end{ Claim \int_to_Roman:n { \value{claimlevel} } }
 }
\ExplSyntaxOff

% Sensible theorem numbering according to chapter/section/subsection.
\renewcommand{\thetheorem}{%
  \ifnum\value{section}=0
    \thechapter% "no section"
  \else
    \ifnum\value{subsection}=0
      \thesection{.}% "no subsection"
    \else
      \thesubsection{.}% "within a subsection"
    \fi
  \fi%
  \arabic{theorem}}

%Define solution and proof environments.
\makeatletter
\newenvironment{solution}{\par
  \pushQED{\qed}%
  \normalfont \topsep6\p@\@plus6\p@\relax
  \trivlist
  \item\relax
      {\fontfamily{qhv}\small\textbf
    {Solution}\@addpunct{.}}\hspace\labelsep\ignorespaces
}{%
  \popQED\endtrivlist\@endpefalse
}
\renewenvironment{proof}[1][\proofname]{\par
  \renewcommand\qedsymbol{$\blacksquare$}
  \pushQED{\qed}%
  \normalfont \topsep6\p@\@plus6\p@\relax
  \trivlist
  \item\relax
      {\itshape
    #1\@addpunct{.}}\hspace\labelsep\ignorespaces
}{%
  \popQED\endtrivlist\@endpefalse
}
\makeatother

% Giles Castel Inkscape Figure Manager
% https://castel.dev/post/lecture-notes-2/
\usepackage{import}
\usepackage{pdfpages}
\usepackage{transparent}
\usepackage{xcolor}
\usepackage{xifthen}

\newcommand{\incfig}[1]{%
    \def\svgwidth{\columnwidth}
    \import{./figures/}{#1.pdf_tex}
}
\pdfsuppresswarningpagegroup=1

\newcommand{\homework}[3]{%
    \author{Kogasa}
    \date{#2}
    \title{\vspace{-3em}#3\\Homework #1}
    \lhead{#3}
    \chead{Homework #1}
    \rhead{\theauthor}
    \pagestyle{fancy}
}

\usepackage{xifthen}
\def\testdateparts#1{\dateparts#1\relax}
\def\dateparts#1 #2 #3 #4 #5\relax{
    \marginpar{\small\textsf{\mbox{#1 #2 #3 #5}}}
}

\def\@lecture{}%
\newcommand{\lecture}[3]{
    \ifthenelse{\isempty{#3}}{%
        \def\@lecture{Lecture #1}%
    }{%
        \def\@lecture{Lecture #1: #3}%
    }%
    \subsection*{\@lecture}
    \marginpar{\small\textsf{\mbox{#2}}}
}