% -----------------------------*- LaTeX -*------------------------------
%
%   handout.sty -- definitions for notes, class handouts, homeworks,
%   		   exams, and so forth.
%
% ----------------------------------------------------------------------

% set one-inch margins all around, NOT counting the headers and footers

\RequirePackage[margin=1in]{geometry}

%
%  \headers{left}{middle}{right} -- set up boldface underlined headers
%	left	-- left header item
%	middle	-- middle header item
%	right	-- right header item
%  
%  \headers{CS 170}{Final Exam}{Fall 1992}
%  \headers{CS 277}{Homework 1 (9/15/92)}{Jeff Erickson}
%
\newcommand{\headers}[3]{
   \newpage\setcounter{page}{1}
   \def\@oddhead{$\underline{\hbox to\textwidth{%
	\textbf{\rlap{#1}\phantom{hj}\hfill #2 \hfill \llap{#3}}}}$}
   \def\@oddfoot{\hfill\thepage\hfill}
}

%
%  ``Problems'' environment.
%  Just like ``enumerate'', except (try to) indent second and
%  succeeding paragraphs in each item, and (try to) separate items by
%  as much space as possible.  Doesn't work very well.
%
\newlength\tmplen
\newcounter{probnum}[section]
\newenvironment{problems}
{\tmplen=\parindent\begin{enumerate}\parindent=\tmplen\itemsep=3ex plus 0.1fil}
{\setcounter{probnum}{\theenumi}\end{enumerate}}

%
%  Official solution environment.
%
\newsavebox{\solnbox}
\newlength{\solnwidth}
\newenvironment{soln}%
{\setlength{\solnwidth}{\linewidth}
\addtolength{\solnwidth}{-2\fboxsep}\addtolength{\solnwidth}{-2\fboxrule}
\par\nobreak\begin{lrbox}{\solnbox}\begin{minipage}[t]{\solnwidth}
\small\parindent=1pc\noindent\ignorespaces}
{\end{minipage}\end{lrbox}\medskip\noindent\fbox{\usebox{\solnbox}}\bigbreak}

%
%  This is much better!
%
\newproof{solution}{Solution}(\normalsize\rm\parindent1.5em)[\markatright{$\blacksquare$}]
\newenvironment{Solution}{\normalsize\rm\begin{solution}\parindent1em}
{\end{solution}}

%
%  \hidesolutions does just what it sounds like.
%
\RequirePackage{verbatim}
\def\hidesolutions{\let\soln\comment\let\endsoln\endcomment
\let\solution\comment\let\endsolution\endcomment} 

%
%  Add stars and other marks in front of enumerated items.
%
\def\itemstars{}
\def\itemding{}
\def\resetmarks{\xdef\itemding{}\xdef\itemstars{}}
\def\Hard{\def\itemstars{$^\star$}}
\def\ReallyHard{\def\itemstars{$^\bigstar$}}
\def\ReallyReallyHard{\def\itemstars{{\Large$\bigstar$}}}
\def\ugradmark{{\large $\blacktriangleright$}}
\def\gradmark{{\large $\rhd$}}
\def\Ugrad{\def\itemding{\ugradmark}}
\def\Grad{\def\itemding{\gradmark}}

\def\Hint#1{\textsl{[Hint: #1]}}
\def\labelenumi{\llap{\itemding\itemstars}\theenumi.\resetmarks}
\def\labelenumii{\llap{\itemding\itemstars}(\theenumii)\resetmarks}

%
%  ``Exercise'' environment (for course notes)
%
\newproof{exercise}{Exercise}

%
%  Inline figure environment
%
\newenvironment{inline}{\begin{center}\footnotesize\sf}{\end{center}}