%%
%% problemset package:
%%   macros for problem sets
%%

%% TeX format
\NeedsTeXFormat{LaTeX2e}[1995/12/01]

%% package name
\ProvidesPackage{problemset}[2022/01/25]

\newif\ifproblemineq
\newif\ifquestionineq

\DeclareOption{problem_in_eq}{\problemineqtrue}
\DeclareOption{no_problem_in_eq}{\problemineqfalse}
\DeclareOption{question_in_eq}{\questionineqtrue}
\DeclareOption{no_question_in_eq}{\questionineqfalse}

\def\problemset@defaultoptions{
  \ExecuteOptions{problem_in_eq, no_question_in_eq}
  \ProcessOptions
}

%% the problem command handles automatic problem numbering, as well as per-problem equation numbering

% problem counter
\newcounter{problemcount}

% problem@temp is set to true when there is an optional argument
\newif\ifproblem@temp
\def\problem{%
  % check whether there is an optional argument (if there is none, add on empty '[]')
  \@ifnextchar [{\problem@temptrue\@problemx}{\problem@tempfalse\@problemx[]}%
}
% command with optional argument
\def\@problemx[#1]{%
  % reset question counter
  \setcounter{questioncount}{0}
  % if optional argument, set problem num to argument
  \ifproblem@temp%
    \edef\problemnum{#1}%
  % otherwise, count
  \else%
    \stepcounter{problemcount}%
    \edef\problemnum{\theproblemcount}%
  \fi%
  % if ian class
  \ifianclass%
    % define tag for label
    \hrefanchor%
    \xdef\tag{E\problemnum}%
    %
    % add header to equation numbers (for ian class)
    \ifproblemineq%
    \def\eqprefix{E\problemnum.}%
    % reset equation number
    \setcounter{seqcount}{0}%
    \fi%
  \fi%
  % header
  \problemformat{E\problemnum}%
}

% problem formatting (override to customize)
\def\problemformat#1{{\bf #1}. }


%% question is to problem as subsection is to section

% question counter
\newcounter{questioncount}

% question@temp is set to true when there is an optional argument
\newif\ifquestion@temp
\def\question{%
  % check whether there is an optional argument (if there is none, add on empty '[]')
  \@ifnextchar [{\question@temptrue\@questionx}{\question@tempfalse\@questionx[]}%
}
% command with optional argument
\def\@questionx[#1]{%
  % if optional argument, set problem num to argument
  \ifquestion@temp%
    \edef\questionnum{#1}%
  % otherwise, count
  \else%
    \stepcounter{questioncount}%
    \edef\questionnum{\alph{questioncount}}%
  \fi%
  % header
  \questionformat{\questionnum}%
  % if ian class
  \ifianclass%
    % define tag for label
    \hrefanchor%
    \xdef\tag{\questionnum}%
    %
    % add header to equation numbers (for ian class)
    \ifquestionineq%
    \def\eqprefix{\questionnum.}%
    % reset equation number
    \setcounter{seqcount}{0}%
    \fi%
  \fi%
}

% question formatting (override to customize)
\def\questionformat#1{{\bf(#1)} }

\def\solution#1{
  \makelink{sol:#1}{\thepage}
  {\bf Solution\-~\ref{ex:#1}}\par\penalty10000\smallskip\penalty10000
  \def\eqprefix{S\textref{ex:#1}.}
  \resetpointcounter
  \setcounter{seqcount}{0}
}

%\newif\ifsolution
%% display solutions
%\long\def\solution#1{
%  \ifsolution
%    \bigskip
%    \leftskip20pt
%    \rightskip20pt
%    {\bf Solution}: #1
%    \par
%    \leftskip0pt
%    \rightskip0pt
%    \bigskip
%  \fi
%}


% rubric
\newif\ifrubric
\long\def\rubric#1{
  \ifrubric
    ({\it #1})
  \fi
}

%% end
\problemset@defaultoptions
\endinput