todonotes.sty

% todonotes.sty
% ====================
% Part: Identification
% ====================
\ProvidesPackage{todonotes}[2008/05/15]


% ==============================
% Part: The package loading part
% ==============================
% Loads the packages that todonotes depends on.
\RequirePackage{ifthen}
\RequirePackage{xkeyval}
\RequirePackage{hyperref}
\RequirePackage{tikz}
\RequirePackage{calc}


% ==================
% Part: Initial code
% ==================
% Here the default values are set
\newcommand{\@backgroundcolor}{orange}
\newcommand{\@bordercolor}{black}
\newcommand{\@textwidth}{3cm}


% ================================
% Part: The declaration of options
% ================================
% In this part the various options for
% the package are defined.

% Make it possible to disable the functionality
% of the package. If this option is given, the
% commands \todo{} and \listoftodos are defined
% as commands with no effect. (But you can still
% compile you document with these commands).
\newif{\ifdisabled}
\DeclareOptionX{disable}{\disabledtrue}

% The default style behaves bad when compiled
% with latex (some text placement problems).
% The dvistyle option, changes the visual behavior
% to avoid this text placement problem.
\newif{\ifdviStyle}
\DeclareOptionX{dvistyle}{\dviStyletrue}

% Make the background color of the notes as
% an option.
\define@key{todonotes.sty}%
{color}{\renewcommand{\@backgroundcolor}{#1}}

% Make the color of the notes box color as
% an option.
\define@key{todonotes.sty}%
{bordercolor}{\renewcommand{\@bordercolor}{#1}}

% Make the text width as an option.
\define@key{todonotes.sty}%
{textwidth}{\renewcommand{\@textwidth}{#1}}

% Finally process the given options.
\ProcessOptionsX


% ========================
% Part: The main code part
% ========================
\ifdisabled
% If the option "disable" was passed to the package
% define two empty commands.
\newcommand{\listoftodos}{}
\newcommand{\todo}{}
\else
% Define the list of todos command
\newcommand{\listoftodos}
{\section*{Todo list} \@starttoc{tdo}}
\newcommand{\l@todo}
{\@dottedtocline{1}{0em}{2.3em}}

% Define styles used by the todo command
\tikzstyle{notestyle} = [
draw=\@bordercolor,
line width=0.5pt,
 fill=\@backgroundcolor,
text width = \@textwidth - 1.6 ex - 1pt,
inner sep = 0.8 ex]
\tikzstyle{notestyleleft} = [notestyle]
\tikzstyle{connectstyle} = [
draw = \@backgroundcolor,
thick]

% Define the todo command
\newcommand{\todo}[1]{%
% Add to todo list
\addcontentsline{tdo}{todo}{\protect{#1}}%
%
% Remember where we are
\begin{tikzpicture}[remember picture, baseline=-0.75ex]%
\node [coordinate] (inText) {};%
\end{tikzpicture}%
%
% Make the margin par
\marginpar {% Draw note in right margin
\ifdviStyle%
% Using dviStyle
\tikz[remember picture] \draw node[notestyle] {}; \\ %
\begin{minipage}{\@textwidth}%
#1%
\end{minipage} \\%
\tikz[remember picture] \draw node[notestyle] (inNote) {};%
\begin{tikzpicture}[remember picture, overlay]%
\draw[connectstyle]%
 ([yshift=-0.2cm] inText)%
  -| ([xshift=-0.2cm] inNote.west)%
  -| (inNote.west);%
\end{tikzpicture}%
\else%
% Using normal style (non dviStyle)
\tikz[remember picture] \draw node[notestyle] (inNote) {#1};%
\begin{tikzpicture}[remember picture, overlay]%
\draw[connectstyle]%
 ([yshift=-0.2cm] inText)%
  -| ([xshift=-0.2cm] inNote.west)%
  -| (inNote.west);%
\end{tikzpicture}%
\fi % Ending \ifdviStyle
}%
}%
\fi % Ending \ifdisabled