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\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{uassign}[2015/09/04 University assignments package]

% Author: 	Nathan Esau
% Date:		September 6, 2015
% Version: 	1.0

\RequirePackage{ifthen}

\makeatletter

% Counters
\newcounter{questioncounter}
\newcounter{solutioncounter}

% For printing "# " OR "Solution: " for answers
\newboolean{questionsandanswers}  

% For hiding question environment
\newboolean{showquestions}
\setboolean{showquestions}{true}

% For hiding solution environment
\newboolean{showanswers}
\setboolean{showanswers}{true}

\DeclareOption{hideanswers}{\setboolean{showanswers}{false}}
\DeclareOption{hidequestions}{\setboolean{showquestions}{false}}

\DeclareOption*{\PackageWarning{assn}{Unknown ‘\CurrentOption’}}
\ProcessOptions\relax

% For hiding
\newsavebox{\trashcan}

% Question environment
\ifthenelse{\boolean{showquestions}}{%
	% show the questions
	\newenvironment{question}{%
	% 
	\medskip
	\refstepcounter{questioncounter}
	\vspace{-5mm}
	\list{\thequestioncounter .}{%
    	\settowidth{\leftmargin}{10. \hskip\labelsep}%
   	 	\labelwidth\leftmargin\advance\labelwidth-\labelsep
   	 	\partopsep=0pt\bigskip
  	    \item
	}}{\endlist}}%
{%
	% don't show the questions
	\newenvironment{question}{%
	\begin{lrbox}{\trashcan}}%
	{\end{lrbox}}%
\question Hello
\endgroup
}
 
% Solution environment
\ifthenelse{\boolean{showanswers}}{%
	% show the answers 
	\newenvironment{solution}[1][1.5em]{%
	%
	\medskip
	\refstepcounter{solutioncounter}
	\vspace{-5mm}
	\list{\ifthenelse{\boolean{showquestions}}{}{\thesolutioncounter .}}{%
    \settowidth{\leftmargin}{10. \hskip\labelsep}%
    \labelwidth\leftmargin\advance\labelwidth-\labelsep
    \partopsep=0pt\bigskip
    \ifthenelse{\boolean{showquestions}}{%
    	\medskip \item[] \qquad \ \textbf{Solution: } \vspace{-3mm} \item[]}
    	{\item}%
	}}{\endlist}}%
{%
	% don't show the answers
	\newenvironment{solution}{%
	\begin{lrbox}{\trashcan}}%
	{\end{lrbox}}%
}
  
\makeatother