% \iffalse meta-comment
%
% Copyright (C) 2014-2020 by Fabian Lipp <fabian.lipp@gmx.de>
% based on the todonotes package
%   by Henrik Skov Midtiby <henrikmidtiby@gmail.com>
% ------------------------------------------------------------
% 
% This file may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.2
% of this license or (at your option) any later version.
% The latest version of this license is in:
%
%    http://www.latex-project.org/lppl.txt
%
% and version 1.2 or later is part of all distributions of LaTeX 
% version 1999/12/01 or later.
%
% \fi
%
% \iffalse
%<*driver>
\ProvidesFile{luatodonotes.dtx}
%</driver>
%<package>\NeedsTeXFormat{LaTeX2e}[1999/12/01]
%<package>\ProvidesPackage{luatodonotes}
%<*package>
    [2020/02/16 v0.5 luatodonotes source and documentation.]
%</package>
%
%<*driver>
\documentclass{ltxdoc}
\usepackage{wrapfig}
\PassOptionsToPackage{colorlinks, urlcolor=blue}{hyperref}
\usepackage{hypdoc} % this package loads hyperref among others
\usepackage[colorinlistoftodos, shadow]{luatodonotes}[2020/02/16]
\usepackage{fontspec}
\usepackage{amsmath}
\usepackage{setspace}
\usepackage{soul}
\setcounter{tocdepth}{2}
\EnableCrossrefs
\CodelineIndex
\RecordChanges
\begin{document}
  \DocInput{luatodonotes.dtx}
%\iffalse
%  \PrintChanges
%  \PrintIndex
%\fi
\end{document}
%</driver>
% \fi
%
% \CheckSum{951}
%
% \CharacterTable
%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
%   Digits        \0\1\2\3\4\5\6\7\8\9
%   Exclamation   \!     Double quote  \"     Hash (number) \#
%   Dollar        \$     Percent       \%     Ampersand     \&
%   Acute accent  \'     Left paren    \(     Right paren   \)
%   Asterisk      \*     Plus          \+     Comma         \,
%   Minus         \-     Point         \.     Solidus       \/
%   Colon         \:     Semicolon     \;     Less than     \<
%   Equals        \=     Greater than  \>     Question mark \?
%   Commercial at \@     Left bracket  \[     Backslash     \\
%   Right bracket \]     Circumflex    \^     Underscore    \_
%   Grave accent  \`     Left brace    \{     Vertical bar  \|
%   Right brace   \}     Tilde         \~}
%
%
% \changes{0.1}{2014/08/07}{The first version of the package}
% \changes{0.2}{2015/01/13}{Fix wrong linespacing when changing fontsize}
% \changes{0.2}{2015/01/13}{Included suggestions from CTAN submission into
% documentation}
% \changes{0.2}{2015/03/12}{Added troubleshooting section to documentation}
% \changes{0.3}{2015/12/03}{Incorporated some changes from todonotes (version
% 1.0.4)}
% \changes{0.4}{2017/10/01}{Incorporated some changes from todonotes (version
% 1.0.5)}
% \GetFileInfo{luatodonotes.dtx}
%
% \DoNotIndex{\newcommand,\newenvironment}
%
% \iffalse
% A macro for marking things todo before the next relase
% (typically update of documentation).
% \fi
% \newcommand{\donow}[1]{\todo[color=blue]{#1}}
% 
%
% \title{The \textsf{luatodonotes} package\thanks{This document
%   corresponds to \textsf{luatodonotes}~\fileversion, dated \filedate.}}
% \author{Fabian Lipp\thanks{This documentation and the whole package is based
% on version 1.0.2 of the todonotes package by Henrik Skov Midtiby.} \\
% \texttt{fabian.lipp@gmx.de}}
%
% \maketitle
%
% \begin{abstract}
% The |luatodonotes| package allows you to insert to--do items in your
% document. At any point in the document a list of all the inserted
% to--do items can be listed with the |\listoftodos| command.
%
% It is an extended version of the |todonotes| package and uses more advanced
% algorithms to place the to--do notes on the page.
% For this algorithms it depends on Lua\TeX.
% \end{abstract}
%
% \pdfbookmark[1]{Contents}{contents}
% \tableofcontents
%
% \newpage
% \section{Introduction}
%
% The |luatodonotes| package makes three commands available to the
% user: |\todo[]{}|, |\missingfigure{}| and |\listoftodos|.
% |\todo[]{}| and |\missingfigure{}| makes it possible to insert
% notes in your document about things that has to be done later
% (todonotes \ldots).
% This package is based on version 1.0.2 of
% |todonotes|\footnote{\url{http://www.ctan.org/pkg/todonotes}} by Henrik Skov
% Midtiby.
%
% The positions of the notes on the page is determined using algorithms
% implemented in Lua, so you have to process your documents using Lua\LaTeX.
% The package can be used as a drop-in replacement for the original
% |todonotes| package, you
% only need to modify |\usepackage{todonotes}| to |\usepackage{luatodonotes}|.
% Note that |todonotes| and |luatodonotes| must not be loaded inside the same
% document.
% 
% Some alternatives for the luatodonotes package are:
% \begin{itemize}
% \item \href{http://www.ctan.org/pkg/easy-todo}{easy-todo}\\
% Depends on |color|, |tocloft| and |ifthen|, small feature set.
% \item \href{http://www.ctan.org/pkg/fixmetodonotes}{fixmetodonotes}\\
% Depends on |graphicx|, |color|, |transparent|, |watermark|, |fix-cm|, |ulem| and |tocloft|, small feature set.
% \item \href{http://www.ctan.org/pkg/todo}{todo}\\
% Depends on |amssymb|, medium feature set.
% \item \href{http://www.ctan.org/pkg/fixme}{fixme}\\
% Large package with a lot of features.
% \item \href{http://www.ctan.org/pkg/todonotes}{todonotes}
% \end{itemize}
%
% Compared to the classical todonotes this package has more advanced algorithms
% and more configuration options to control the position of the notes on the
% page.
% Additionally, we are able to place notes at almost every position on the
% page, e.\,g., in floating environments or in footnotes.
% As a disadvantage luatodonotes requires Lua\LaTeX{} for document processing, so
% a standard |pdflatex| won't work.
% Depending on the chosen layout for the to--do notes the runtime can be much
% higher than with todonotes.
% Labels placed by luatodonotes can conflict with text placed with
% |\marginpar|.
%
% The main reason for considering other packages is that the todonotes 
% package is quite large and relies heavily on tikz.
% This can slow down compilation of large documents significantly.
% The mentioned alternatives have a different feature set and do not 
% rely on tikz, which makes them require less ressoureces.
%
%
%
% \subsection{Using Lua\LaTeX}
% It is quite easy to switch from |pdflatex| to |lualatex|.
% You only have to load a few different packages.
% A small guide can be found in the Lua\LaTeX{}
% guide\footnote{\url{http://mirror.ctan.org/info/luatex/lualatex-doc/lualatex-doc.pdf}}.
%
% The Lua\TeX{} processor (the |lualatex| executable) should be included in all
% modern \TeX{} distributions, so you do not need to install additional
% software.
% You simply have to run |lualatex| instead of |pdflatex| (or instead of
% |latex|, |xelatex|).
%
%
%
% \subsection{Usage of luatodonotes}
% The package is loaded with |\usepackage|\oarg{options}|{luatodonotes}|.
% Valid options are described in Section~\ref{subsecPackageOptions}.
% Note that |todonotes| must \emph{not} be loaded.
% You have to use |lualatex| to process your document, |pdflatex| will not
% work.
% The package depends on positions written to the aux-file, so you have to run
% |lualatex| twice or even three times to get the labels and leaders for the
% notes right.
%
% \DescribeMacro{\todo}
% My \index{\todo}most common usage of the todonotes package, is to 
% insert an todonotes somewhere in a latex document. 
% An example of this usage is the command 
%
% |\todo{Make a cake \ldots}|, 
% 
% \noindent
% which renders like\todo{Make a cake \ldots}.
% The |\todo| command has this structure: 
% |\todo|\oarg{options}\marg{todo text}.
% The |todo text| is the text that will be shown in the todonote and
% in the list of todos. The optional argument |options|, allows the
% user to customize the appearance of the inserted todonotes.
% For a description of all the options see section
% \ref{subsecTodoOptions}.
%
% \DescribeMacro{\todoarea}
% The |\todoarea| is similiar to |\todo|, but is able to highlight a specified
% area in the text, to which the note is connected.
% The command has this structure:
% |\todoarea|\oarg{options}\marg{note text}\marg{highlighted text}.
% This command was not tested extensively until now, so it should be used with
% caution.
%
% \DescribeMacro{\missingfigure}
% The |\missingfigure| command inserts an image containing an 
% attention sign and the given text.
% The command takes only one argument
% |\missingfigure|\marg{text}, a text string that could
% describe what the figure should consist of.
% An example of its usage could be 
%
% |\missingfigure{Make a sketch of the structure of a trebuchet.}| 
%
% \noindent
% which renders like.
%
% \missingfigure{Make a sketch of the structure of a trebuchet.}
%
%
% \DescribeMacro{\listoftodos}
% The |\listoftodos| command inserts a list of all the todos in the
% current document. |\listoftodos| takes no arguments.
% For this document the list of to--do's looks like.
% \listoftodos
% \vspace{0.5cm}
%
% \DescribeMacro{\todototoc}
% The |\todototoc| command adds an entry to the table of contents for 
% list of todos. The command should be placed right before the 
% |\listoftodos| command.
%
% \subsection{Package options}
% \label{subsecPackageOptions}
% \DescribeMacro{disable}
% If the option |disable| is passed to the package, the macros
% usually defined by the package (|\todo|, |\todoarea|, |\listoftodos| and
% |\missingfigure|) are defined as macros with no effect, and thus
% all inserted notes are removed.
%
% \DescribeMacro{obeyDraft, obeyFinal}
% When the option |obeyDraft| is given, the package checks
% if the one of the options |draft|, |draftcls| or |draftclsnofoot| 
% is given (this option is usually given to
% the documentclass). If the |draft| option is given, the
% functionality of the package is enabled and otherwise the effect
% of the package is disabled.
% The option |obeyFinal| does something similar, except that the 
% todonotes package is only disabled if the |final| option given.
%
% \DescribeMacro{danish, german, ngerman, english, french, swedish}
% \DescribeMacro{spanish, catalan, italian}
% \DescribeMacro{portuguese, dutch, croatian}
% Use translations of the text strings 
% ''List of todos'' and ''Missing figure''.
% The default is to use none of these options, which results in
% english text strings.
% Currently the following languages are supported: 
% catalan,
% croatian,
% danish,
% dutch,
% english,
% french,
% german,
% ngerman,
% italian,
% portuguese,
% spanish and
% swedish.
% 
% \DescribeMacro{colorinlistoftodos}
% Adds a small colored square in front of all items in the Todo
% list. The color of the square is the same as the fill color of the
% inserted todonote.
% This can be useful if there are different types of todos 
% (insert reference, explain in detail, \ldots) where the color of
% the inserted todonote marks the type of todo.
%
% \DescribeMacro{color}
% \DescribeMacro{backgroundcolor}
% \DescribeMacro{linecolor}
% \DescribeMacro{bordercolor}
% These options sets the default colors for the todo command.
% There is three colors that can be specified. The border color
% (default |bordercolor=black|) around the inserted text, the color
% behind the inserted text (default |backgroundcolor=orange|) and
% the color of the line connecting the inserted textbox with the
% current location in the text (default |linecolor=black!30|). 
% Setting the |color| option to |val| passes this value on to the 
% background and line color options.
% The specified colors must be valid according to the 
% |xcolor| package.
%
% \DescribeMacro{textsize}
% |textsize=value| sets the default text size of the inserted
% todonotes to the given value.
% Value is the ''name'' of the used font size, eg. if the desired
% fontsize is |\tiny| use |textsize=tiny|. The default value is 
% |textsize=normalsize|.
%
% \DescribeMacro{prependcaption}
% The |prependcaption| option triggers a special behaviour of the
% |caption=val| option for the todo command, where the given value
% |val| is inserted in the inserted todonote.
% 
% \DescribeMacro{shadow}
% If the |shadow| option is given, the inserted todonotes will be
% displayed with a gray shadow.
% I expect that the option will trigger problems with tikz versions
% prior to 2.0.
%
% \DescribeMacro{figwidth}
% \DescribeMacro{figheight}
% The |figwidth=length| option and |figheight=length| option set the default
% width and height of the figure
% inserted by the |\missingfigure| command. 
% The default value is |\linewidth| for the width and |4cm| for the height.
%
% \DescribeMacro{leaderwidth}
% The |leaderwidth=length| option specifies the width of the leader lines.
% The argument is passed to the |line width| option in TikZ.
% The default value is |1.6pt|.
%
% \DescribeMacro{leadertype}
% The |leadertype=type| option specifies the shape of the leaders, which are
% drawn between the labels in the margin and the corresponding sites in text.
% We use the characterization of the leader types known from boundary labeling:
% $p$ denotes a segment parallel to the left/right side of the text area, while
% $o$ denotes a orthogonal segment.
% $s$ is a straight-line segment.
% The following types are available (|opo| is the default value):
% \begin{itemize}
%    \item |s|:
%    Straight-line connection between site and label.
%    \item |sBezier|:
%    Uses the straight-line leaders but transforms them into B\'ezier curves,
%    which are easier to follow for the reader.
%    The generated curves don't cross each other when the straight-line leaders
%    are crossing-free.
%    \item |opo|:
%    This is the style used in the original todonotes package.
%    The leaders start with a horizontal segment at the site in the text,
%    followed by a vertical segment in the margin beneath the text.
%    The last segment is a vertical segment, which connects to the label.
%    \item |os|:
%    This is the style used in common word processing applications like
%    LibreOffice.
%    The leader also starts with a horizontal segment that leads to the margin
%    and is connected to the label by a straight line.
%    \item |po|:
%    The leader starts with a vertical segment at the site in text and is then
%    connected to the label by a horizontal segment.
% \end{itemize}
%
% \DescribeMacro{positioning}
% The |positioning=algorithm| option specifies, which algorithm is used to
% determine the positions of the notes on the page.
% You should choose the algorithm depending on the leader type you want to use.
% You can also use one of the options |s|, |po|, |bezier|, or |opo| to define
% the positioning algorithm together with the leadertype.
% The default value for this option is |inputOrderStacks|.
% The following algorithms are available:
% \begin{itemize}
%    \item |inputOrder|:
%    Place the labels in the order given by the
%    y-coordinates of the corresponding sites in text.
%    Intended for use with $opo$- or $os$-leaders.
%    \item |inputOrderStacks|:
%    Like the algorithm before, but the labels are
%    clustered before they are placed.
%    Thus the labels are placed nearer to their sites.
%    Intended for use with $opo$- or $os$-leaders.
%    \item |sLeaderNorthEast|:
%    Places labels in a way that they can be connected to their sites by
%    straight-line leaders without crossings.
%    The leaders are attached to the upper right or upper left corner of the
%    label (depending on which site of the text the label is placed).
%    Intended for use with $s$-leaders or B\'ezier leaders.
%    \item |sLeaderNorthEastBelow|:
%    Like the algorithm before, but the leader is attached to a point that is a
%    constant offset below the corner of the label.
%    Intended for use with $s$-leaders or B\'ezier leaders.
%    \item |sLeaderNorthEastBelowStacks|:
%    Like the algorithm before, but the labels are cluster before they are
%    placed.
%    Thus the labels are placed nearer to their sites.
%    Intended for use with $s$-leaders or B\'ezier leaders.
%    \item |sLeaderEast|:
%    Like the algorithms before, but the leader is attached to the center of the
%    right or left boundary of the label.
%    Intended for use with $s$-leaders or B\'ezier leaders.
%    \item |poLeaders|:
%    Calculates label positions that lead to $po$-leaders with minimum total
%    length.
%    This algorithm depends heavily on the number of notes, so the runtime and
%    memory consumption can get very high.
%    \item |poLeadersAvoidLines|:
%    Like the algorithm before, but tries to avoid overlapping of horizontal
%    leader segments with text.
%    This algorithm depends heavily on advanced Lua\TeX\ features to manipulate
%    the data structures of the page, so it possibly could give conflicts with
%    other packages.
% \end{itemize}
%
% \DescribeMacro{s}
% \DescribeMacro{bezier}
% \DescribeMacro{opo}
% \DescribeMacro{po}
% Shorthand options for convenience, which represent common combinations of
% leadertypes and postioning algorithms.
% |leadertype| or |positioning| options following one of these options override
% its settings.
% They use the following positioning algorithms:
% \begin{itemize}
%    \item |s|: |sLeaderNorthEastBelowStacks|
%    \item |bezier|: |sLeaderNorthEastBelowStacks|
%    \item |opo|: |inputOrderStacks|
%    \item |po|: |poLeadersAvoidLines|
% \end{itemize}
%
% \DescribeMacro{splitting}
% The |splitting=algorithm| option can be used to place the labels on both sides
% of the text.
% The notes are only separated when there is enough space on both sides (see
% |minNoteWidth|.
% The default value for this option is |none|.
% Available algorithms for this option are:
% \begin{itemize}
%    \item |none|:
%    Labels are placed in the wider margin only.
%    \item |middle|:
%    The text area is split in the middle in a left and a right half.
%    Labels, whose sites are in the left half of the text, are placed in the
%    left margin, the others in the right margin.
%    \item |median|:
%    The notes are seperated at the median of the sites (sorted by
%    x-coordinate).
%    That is, the number of notes in the left and the right margin is equal
%    (except for one note).
%    \item |weightedMedian|:
%    Considers the height of the labels for the median.
%    So the total height of the labels in the left margin is approximately equal
%    to that in the right margin.
% \end{itemize}
%
% \DescribeMacro{interNoteSpace}
% The |interNoteSpace=length| option specifies the minimum vertical distance
% between two notes.
% The default value is |5pt|.
%
% \DescribeMacro{noteInnerSep}
% The |noteInnerSep=length| option specifies the |inner sep| used for the TikZ
% nodes, i.\,e., the distance between the border of the note and the text inside
% it.
% The default value is |5pt|.
%
% \DescribeMacro{routingAreaWidth}
% The |routingAreaWidth=length| option specifies the width of the so called
% routing area.
% This is the area, in which the vertical segment of $opo$-leaders are placed.
% The area is also used for $os$-leaders.
% The default value is |0.4cm|.
%
% \DescribeMacro{minNoteWidth}
% The |minNoteWidth=length| option specifies the minimum width of the labels.
% When there is fewer space in one of the margins, this margin is not considered
% for label placement.
% If both margins are narrower, no labels are placed and an error message is
% printed to the console output.
% The default value of this option is |2.0cm|.
%
% \DescribeMacro{distanceNotesPageBorder}
% The |distanceNotesPageBorder=length| option specifies the horizontal distance
% from the labels to the borders of the paper.
% You can adjust this setting to your printer margins.
% The default value of this option is |0.5cm|.
%
% \DescribeMacro{distanceNotesText}
% The |distanceNotesPageBorder=length| option specifies the horizontal distance
% between the labels and the text area.
% With $opo$- or $os$-leaders the routing area is inserted additionally so the
% distance between labels and text area increases.
% The default value of this option is |0.2cm|.
%
% \DescribeMacro{rasterHeight}
% The |rasterHeight=length| option is used only for the $po$-leader algorithm.
% For this algorithm the page is rasterized and the labels are placed only on
% the positions given by this raster.
% Decreasing this value can yield better results (i.\,e., smaller total leader
% length), but strongly increases the runtime and memory consumption.
% The default value of this option is |1cm|.
%
% \DescribeMacro{additionalMargin}
% The |additionalMargin=length| option extends the page margins horizontally.
% To achieve this the page width is increased.
% The page is extended by the given length on both sides.
% The layout of the page stays the same but the paper format is changed: the
% height is left unmodified, but the width is increased by the doubled value of
% the given length.
% This option is useful if you have to adhere to a given layout, whose margins
% are not wide enough to accomodate the notes.
% You can safely use this option as the final layout of your document does not
% change when disabling the |luatodonotes| package.
% The default width of |2cm| for the additional margin is used when the option
% is given without a length.
%
% \DescribeMacro{debug}
% When the |debug| option is activated the package is more verbose on
% the commandline.
% Additionally, some markers, which can be used to understand the algorithms,
% are drawn on the page (depending on the chosen algorithm).
%
%
%
%
% \subsection{Options for the \texttt{todo} command}
% \label{subsecTodoOptions}
% There are several options that can be given to the |\todo|
% command. All the options are described here and often I have
% included examples of the change in visual appearance.
% Default values for these options can be set using the presetkeys 
% command.
% \begin{verbatim}
% \presetkeys{todonotes}{fancyline, color=blue!30}{}
% \end{verbatim}
%
% \DescribeMacro{disable}
% The |disable| option can be given directly to the todo command.
% If given the command has no effect.
%
% \DescribeMacro{color}
% \DescribeMacro{backgroundcolor}
% \DescribeMacro{linecolor}
% \DescribeMacro{bordercolor}
% These options set the color that is used in the current todo
% command.
% The color classes is the same as used in the color package
% options, see section \ref{subsecPackageOptions}.
% Default values can be set by the color
% options when the todonotes package is loaded.
% \todo[color=green!40]{And a green note}
% The todo notes inserted in this paragraph is created with the
% command
% |\todo[color=green!40]{And a green note}|.
% The color of the inserted note could be used to mark different
% types of tasks (insert references, explain something in detail,
% \ldots), this could be streamlined by defining new commands like
% below.
% \begin{verbatim}
% \newcommand{\insertref}[1]{\todo[color=green!40]{#1}}
% \newcommand{\explainindetail}[1]{\todo[color=red!40]{#1}}
% \end{verbatim}
% An example that uses all of the color options is given below
% \todo[linecolor=green!70!white, backgroundcolor=blue!20!white,
% bordercolor=red]{Anything but default colors}.
% \begin{verbatim}
% \todo[linecolor=green!70!white, backgroundcolor=blue!20!white,
% bordercolor=red]{Anything but default colors}.
% \end{verbatim}
%
%
% \DescribeMacro{line / noline}
% If you want to get rid of the line connecting the inserted note
% with the place in the text where the note occurs in the latex
% code, the option |noline| can be used.
% \todo[noline]{A note with no line connecting it to the placement
% in the original text.}
% |\todo[noline]{A note with no line ...}|
% \vspace{1.0cm}
% 
%
% \DescribeMacro{inline / noinline}
% It is possible to place a todonote inside the text instead of
% placing it in the margin, this could be desirable if the text in
% the note has a considerable length.
% |\todo[inline]{A todonote placed in the text}|
% \todo[inline]{A todonote placed in the text}

% \begin{wrapfigure}[1]{r}[20mm]{40mm}
% \begin{tikzpicture}
% \draw[red] (0, 0) circle(0.45);
% \draw[green] (1, 0) circle(0.45);
% \draw[blue] (2, 0) circle(0.45);
% \end{tikzpicture}
% \caption{A text explaining the image.
% \todo[inline]{Fill those circles \ldots}}
% \end{wrapfigure}
% Another usage for the inline option is when you want to add a
% todonote to a figure caption.
%
% \begin{verbatim}
% \begin{wrapfigure}{r}[20mm]{40mm}
% \begin{tikzpicture}
% \draw[red] (0, 0) circle(0.45);
% \draw[green] (1, 0) circle(0.45);
% \draw[blue] (2, 0) circle(0.45);
% \end{tikzpicture}
% \caption{A text explaining the image.
% \todo[inline]{Fill those circles \ldots}}
% \end{wrapfigure}
% \end{verbatim}
%
% \DescribeMacro{size}
% |size=val| changes the size of the text inside the todonote.
% The commands used to create the notes below are \\ \noindent
% |\todo[size=\Large]{A note with a large font size.}|
% and \\ \noindent
% |\todo[inline, size=\tiny]{Note with very small font size.}|.
% \todo[size=\Large]{A note with a large font size.}
% \todo[inline, size=\footnotesize]{Note with very small font size.}
%
% \DescribeMacro{list / nolist}
% When the option |nolist| is given, the todo item will not appear in
% the list of todos.
%
% \DescribeMacro{caption}
% The |caption| option enables the user to specify a short
% description of the todonote that are inserted in the list of
% todos instead of the full todonote text.
% \todo[caption={Short note}]{A very long and tedious note that
% cannot be on one line in the list of todos.}
% \begin{verbatim}
% \todo[caption={Short note}]{A very long and tedious note that
% cannot be on one line in the list of todos.}.
% \end{verbatim}
% The effect of this option is altered with the package option
% |prependcaption| or the |prepend| / |noprepend| option for the
% todo command.
%
% \DescribeMacro{prepend / noprepend}
% The options |prepend| and |noprepend| can be used for setting
% whether a given caption should be prepended to the todonote or
% not.
% Globally this can be set using the |prependcaption| option for the
% package.~\todo[prepend, caption={Short note with prepend}]{A very
% long and tedious note that cannot be on one line in the list of
% todos.} Below is the effect of the option shown using the code:
% \todo[noprepend, caption={Short note with noprepend}]{A very long
% and tedious note that cannot be on one line in the list of
% todos.}
% \begin{verbatim}
% \todo[prepend, caption={Short note with prepend}]{A very long and tedious 
% note that cannot be on one line in the list of todos.}.
% \todo[noprepend, caption={Short note with noprepend}]{A very long and 
% tedious note that cannot be on one line in the list of todos.}.
% \end{verbatim}
%
% \DescribeMacro{author}
% The |author| option takes a parameter, the name of the author.
% The given name is inserted in the todonote.
% \todo[author=Xavier]{Testing author option.}
% \todo[author=Xavier, inline]{Testing author option.}
% \begin{verbatim}
% \todo[author=Xavier]{Testing author option.}
% \todo[author=Xavier, inline]{Testing author option.}
% \end{verbatim}
%
% \subsection{Options for the \texttt{missingfigure} command}
%
% \DescribeMacro{figwidth}
% The |figwidth=length| option sets the width of the figure inserted by the
% |\missingfigure| command.
% Length values below $6cm$ might trigger some problems with the
% visual appearance.
% Try to compare the default of the missing figure command, when the
% option is given or not. 
% \begin{verbatim}
% \missingfigure[figwidth=6cm]{Testing a long text string}
% \end{verbatim}
% \missingfigure[figwidth=6cm]{Testing a long text string}
% \begin{verbatim}
% \missingfigure{Testing a long text string}
% \end{verbatim}
% \missingfigure{Testing a long text string}
% \begin{wrapfigure}{r}[2cm]{6cm}
% \missingfigure[figwidth=6cm]{Add a test image \ldots}
% \end{wrapfigure}
% Another usage of the option is when |\missingfigure| is used in
% the wrapfigure environment.
% \begin{verbatim}
% \begin{wrapfigure}{r}[2cm]{6cm}
% \missingfigure[figwidth=6cm]{Add a test image \ldots}
% \end{wrapfigure}
% \end{verbatim}
% 
% \DescribeMacro{figheight}
% The |figheight=length| option changes the height of the inserted 
% missing figure.
% The default height is 4cm and using values lower than this might 
% cause the warning sign to pop out of the gray area.
% \begin{verbatim}
% \missingfigure[figheight=6cm]{Testing a long text string}
% \end{verbatim}
% \missingfigure[figheight=6cm]{Testing}
%
%
% \DescribeMacro{figcolor}
% The |figcolor=color| options sets the background color of
% inserted missing figures.
% The default color is |black!40|.
% \begin{verbatim}
% \missingfigure[figcolor=white]{Testing figcolor}
% \end{verbatim}
% \missingfigure[figcolor=white]{Testing figcolor}
%
%
%
% \subsection{Options for the \texttt{listoftodos} command}
% The |\listoftodos| command takes one optional argument, that
% defines the name of the inserted list of todos.
% \begin{verbatim}
% \listoftodos[I can be called anything]
% \end{verbatim}
% 
%
% \subsection{Troubleshooting}
% \subsubsection{Missing Lua files}
% A potential error message when Lua source files are not found, is the
% following:
% \begin{verbatim}
% ! LuaTeX error [\directlua]:1: module 'luatodonotes' not found:
%         no field package.preload['luatodonotes']
%         [luatexbase.loader] Search failed
%         [kpse lua searcher] file not found: 'luatodonotes'
%         [kpse C searcher] file not found: 'luatodonotes'
%         [oberdiek.luatex.kpse_module_loader]-eroux Search failed
% stack traceback:
%         [C]: in function 'require'
%         [\directlua]:1: in main chunk.
% l.250 \directlua{require("luatodonotes")}
% \end{verbatim}
% This means that the file |luatodonotes.lua| cannot be found by Lua\TeX.
% It depends on the version of your \TeX{} installation in which directories
% Lua\TeX{} is looking for Lua source files.
% You can query these paths with the following command:
% \begin{verbatim}
% kpsewhich -show-path=lua\end{verbatim}
% See the |kpathsea|
% documentation\footnote{\url{http://tug.org/texinfohtml/kpathsea.html}} for
% the interpretation of this path.
% The Lua source files of the |luatodonotes| package should be in one of the
% searched directories.
% You can modify the path in your \TeX{} configuration or using environment
% variables.
% You can query kpathsea for a file using the default \TeX{} search path with:
% \begin{verbatim}
% kpsewhich luatodonotes.lua\end{verbatim}
% Be sure to run |texhash| (as root if needed) after moving files into the
% texmf tree.
%
% \subsubsection{The \texttt{debug} option}
% You can load the package with the option |debug| (see
% Section~\ref{subsecPackageOptions}).
% It gives some additional information in the console while running Lua\TeX{}
% and draws additional information into the output document.
% For example, the size of the computed areas, in which the labels are placed,
% is shown in the document.
% Depending on the chosen layout algorithm some intermediate steps of the
% algorithms are given.
%
%
%
%
%
% \subsection{Known issues}
% \subsubsection{Package loading order}
% The luatodonotes package requires the following packages:
% \begin{multicols}{2}
% \begin{itemize}
% \item ifthen
% \item xkeyval
% \item xcolor
% \item tikz
% \item graphicx (is loaded via the tikz package)
% \item luacode
% \item luatex
% \item atbegshi
% \item xstring
% \item zref-abspage
% \item ifoddpage
% \item soul
% \item soulpos
% \end{itemize}
% \end{multicols}
% \noindent
% When luatodonotes are loaded in the preamble, the package checks
% if these packages all are loaded. If that is not the case it loads
% the missing packages with no options given.
% If you want to give some specific options to some of these
% packages, you have to load them \emph{before} the luatodonotes
% package, otherwise you will get an ''Option clash'' error when
% latex works on the document.
% 
% If both the menukeys and the xcolor (with the option \verb!table!) 
% package should be loaded, the following order must be used.
% \begin{verbatim}
%\usepackage[table]{xcolor}
%\usepackage{todonotes}
%\usepackage{menukeys}
% \end{verbatim}
%
% \subsubsection{Spacing around inserted notes}
% Inserted todo commands will eat the white space after the command.
% \begin{verbatim}
%Testing\todo{Does this eat the space?} testing.\end{verbatim}
% \noindent
% Testing\todo{Does this eat the space?} testing.
%
% This can be prevented by adding curly parenthesis after the
% todo command, like shown below.
% \begin{verbatim}
%Testing\todo{Does this eat the space?}{} testing.\end{verbatim}
% \noindent
% Testing\todo{Does this eat the space?}{} testing.
%
%
%
% \subsubsection{Conflicts with the amsart documentclass}
% The |amsart| document class redefines some internal commands that
% is used by the todonotes package, this will cause an malfunctioning
% |\listoftodos| command.
% The following code to circumvent the problem was given by Dan
% Luecking on comp.text.tex
% \begin{verbatim}
% \makeatletter
%   \providecommand\@dotsep{5}
% \makeatother
% \listoftodos\relax 
% \end{verbatim}
%
% NOT TESTED
% NOT TESTED
% NOT TESTED
%
% Dominique suggests the following workaround.
% \begin{verbatim}
% \makeatletter
% \providecommand\@dotsep{5}
% \def\listtodoname{List of Todos}
% \def\listoftodos{\@starttoc{tdo}\listtodoname}
% \makeatother
% \end{verbatim}
%
%
%
% \subsubsection{Unknown option ''remember picture''}
% If latex throws the error
% \begin{verbatim}
% Package tikz Error: I do not know what to do with the option ``remember picture''.
% \end{verbatim}
% It probably means that your latex installation is outdated, as
% only newer versions of latex driver for tikz supports the
% |remember picture| option.
% For additional info consult 
% ''Section 10.2.2 Producing PDF Output'' in the tikz manual. 
% \url{http://mirror.ctan.org/graphics/pgf/base/doc/pgfmanual.pdf}
%
%
%
% \subsubsection{List of todo heading is not correctly formatted}
% If using natbib, the todonotes list title gets screwed up unless 
% you do something like this:
% \begin{verbatim}
% \makeatletter\let\chapter\@undefined\makeatother 
% \end{verbatim}
% Suggestion by Richard Stanton.
%
%
%
% \subsubsection{Some commands not working inside notes}
% Some commands will not work like expected, when used inside of a note.
% They will cause errors when processing the document or have simply no effect.
% This is caused by the mechanism used to layout the notes:
% The content is written into a hbox when a |\todo| is encountered.
% The contents of this box are then stored until the note is typeset.
% By that time the contents are taken out of the hbox (by |\unhbox|) and put
% into a |\parbox| with the width required for the note.
% I don't have a solution for this problem yet.
% 
% 
% 
% 
%
% \iffalse
% \StopEventually{\PrintChanges\PrintIndex}
% \fi
% \StopEventually{\clearpage\pdfbookmark{Changes}{changes}\PrintChanges}
%
% \newpage
% \section{Implementation}
% \begin{environment}{luatodonotes.lua}
% In this section only the source code of the LaTeX package file
% (|luatodonotes.sty|) is shown.
% The Lua code is contained in |luatodonotes.lua| and documented by comments
% inside this file.
% These comments are primarily describing technical aspects.
% Information about the implemented algorithms and some theoretical
% considerations can be found in the following documents:
% \begin{itemize}
%   \item Kindermann, P., Lipp, F., and Wolff, A.:
%     Luatodonotes: Boundary Labeling for Annotations in Texts.
%     In: Duncan, C. and Symvonis, A. (eds.) Proc. 22nd Int. Sympos. Graph Drawing GD'14.
%     LNCS, vol. 8871, pp. 76-88. Springer, Heidelberg (2014)
%     \url{http://dx.doi.org/10.1007/978-3-662-45803-7_7}
%   \item Lipp, F.:
%     Boundary Labeling for Annotations in Texts.
%     Master thesis, 2014.
%     \url{http://www1.pub.informatik.uni-wuerzburg.de/pub/theses/2014-lipp-master.pdf}
% \end{itemize}
% \changes{0.2}{2014/09/08}{Compatibility with csquotes package (notes were
% displayed multiple times when used in \texttt{\textbackslash blockquote}
% command)}
% \changes{0.2}{2015/02/28}{Correct height calculation for notes with modified
% fontsize}
% \changes{0.2}{2015/02/28}{Make Lua variables and functions local or put them
% into luatodonotes array (don't pollute global namespace)}
% \changes{0.2}{2015/03/03}{Fix problems with recent versions of lualibs}
% \changes{0.3}{2015/10/30}{Fix problems with doubled notes when code is read
% multiple times (e.g., by tabularx)}
% \changes{0.3}{2015/11/16}{Deal with notes without a page number (happens when
% placed in \texttt{\textbackslash caption}, e.g.)}
% \changes{0.3}{2015/11/30}{Remove two variables from Lua global namespace}
% \changes{0.3}{2015/12/02}{Less console output unless debug option is set}
% \changes{0.5}{2020/01/19}{Fixed bugs when using \texttt{poLeadersAvoidLines}
% as positioning algorithm in newer LuaTeX versions because some APIs have
% changed}
% \changes{0.5}{2020/01/20}{Bugfix: The line position calculation didn't use
% the current page height, which caused an offset on these positions in
% documents not using a4paper}
% \end{environment}
%
% \subsection{Dependencies and definitions}
% Make sure that the classical |todonotes| package is not loaded as we redefine
% its commands.
% Additionally we pretend that |todonotes| 1.0.2 is already loaded.
% So later attempts to load package |todonotes| are simply ignored.
% Loading both packages in the same document would produce errors (like
% ``Command already defined'').
% \changes{0.3}{2015/12/01}{Ensure that package \texttt{todonotes} is not
% loaded}
%    \begin{macrocode}
\@ifpackageloaded{todonotes}{
  \PackageError{luatodonotes}{%
    Conflicting packages todonotes and luatodonotes\MessageBreak
    loaded. Aborting.}{%
    The package luatodonotes was designed as a replacement for todonotes. So it
    is not possible (and not reasonable) to include both of them in the same
    document.%
    If you want to use luatodonotes you should delete the todonotes
    package from\MessageBreak
    your preamble.\MessageBreak}
}{}
\expandafter\def\csname ver@todonotes.sty\endcsname{2014/07/14}
%    \end{macrocode}
% Check if Lua\TeX{} is used.
% \changes{0.2}{2015/02/23}{Check if LuaTeX is used at begin of package}
%    \begin{macrocode}
\RequirePackage{ifluatex}
\ifluatex\else
  \PackageError{luatodonotes}{LuaTeX is required for this package. Aborting.}{%
    This package can only be used with the LuaTeX engine\MessageBreak
    (command `lualatex'). Package loading has been stopped\MessageBreak
    to prevent additional errors.}
\fi
%    \end{macrocode}
% Loads the packages dependencies.
%    \begin{macrocode}
\RequirePackage{ifthen}
\RequirePackage{xkeyval}
\RequirePackage{xcolor}
\RequirePackage{tikz}
\usetikzlibrary{positioning}
\usetikzlibrary{intersections}
\usetikzlibrary{decorations.pathmorphing}
\RequirePackage{luacode}
\RequirePackage{atbegshi}
\RequirePackage{xstring}
\RequirePackage{zref-abspage}
\RequirePackage{ifoddpage}
\RequirePackage{soul}
\RequirePackage{soulpos}
\RequirePackage{etoolbox}
%    \end{macrocode}
% The package |luatex| must not be loaded in new TeX distributions as the
% definition of |\newattribute| in it conflicts with newer versions of
% Lua\LaTeX.
% Older versions of |luatexbase| include the package |luatex| by themselves, for
% newer versions the Lua\LaTeX kernel should include the commands that we need
% (e.\,g., |\newattribute|).
% \changes{0.3}{2015/11/12}{Remove package \texttt{luatex} for current
% versions of Lua\LaTeX (as it caused problems)}
%    \begin{macrocode}
\@ifpackagelater{luatexbase}{2013/05/04}{}{
    \RequirePackage{luatex}
}
%    \end{macrocode}
% Some default values are set
%    \begin{macrocode}
\newcommand{\@todonotes@text}{}%
\newcommand{\@todonotes@backgroundcolor}{orange}
\newcommand{\@todonotes@linecolor}{black!30}
\newcommand{\@todonotes@bordercolor}{black}
\newcommand{\@todonotes@leaderwidth}{1.6pt}
\newcommand{\@todonotes@textsize}{\normalsize}
\newcommand{\@todonotes@figwidth}{\linewidth}
\newcommand{\@todonotes@figheight}{4cm}
\newcommand{\@todonotes@figcolor}{black!40}
%    \end{macrocode}
% Default values for variables added by luatodonotes
%    \begin{macrocode}
\newcommand{\@todonotes@positioning}{inputOrderStacks}
\newcommand{\@todonotes@splitting}{none}
\newcommand{\@todonotes@leadertype}{opo}
\newcommand{\@todonotes@interNoteSpace}{5pt}
\newcommand{\@todonotes@noteInnerSep}{5pt}
\newcommand{\@todonotes@routingAreaWidth}{0.4cm}
\newcommand{\@todonotes@minNoteWidth}{2.0cm}
\newcommand{\@todonotes@distanceNotesPageBorder}{0.5cm}
\newcommand{\@todonotes@distanceNotesText}{0.2cm}
\newcommand{\@todonotes@rasterHeight}{1cm}
\newcommand{\@todonotes@additionalMargin}{2cm}
%    \end{macrocode}
%    \begin{macrocode}
\AtBeginDocument{
\ifx\undefined\phantomsection
\newcommand{\phantomsection}{}
\fi
}
%    \end{macrocode}
%
% \subsection{Declaration of options for the package}
% In this part the various options for
% the package are defined.
%
% Define the default text strings and set localization options for
% the danish and german languages.
%    \begin{macrocode}
\newcommand{\@todonotes@todolistname}{Todo list}
\newcommand{\@todonotes@MissingFigureText}{Figure}
\newcommand{\@todonotes@MissingFigureUp}{Missing}
\newcommand{\@todonotes@MissingFigureDown}{figure}
\newcommand{\@todonotes@SetTodoListName}[1]
    {\renewcommand{\@todonotes@todolistname}{#1}}
\newcommand{\@todonotes@SetMissingFigureText}[1]
    {\renewcommand{\@todonotes@MissingFigureText}{#1}}
\newcommand{\@todonotes@SetMissingFigureUp}[1]
    {\renewcommand{\@todonotes@MissingFigureUp}{#1}}
\newcommand{\@todonotes@SetMissingFigureDown}[1]
    {\renewcommand{\@todonotes@MissingFigureDown}{#1}}
\newif{\if@todonotes@reverseMissingFigureTriangle}
\DeclareOptionX{catalan}{
    \@todonotes@SetTodoListName{Llista de feines pendents}%
    \@todonotes@SetMissingFigureText{Figura}%
    \@todonotes@SetMissingFigureUp{Figura}%
    \@todonotes@SetMissingFigureDown{pendent}%
}
\DeclareOptionX{croatian}{%
   \@todonotes@SetTodoListName{Popis obveza}%
   \@todonotes@SetMissingFigureText{Slika}%
   \@todonotes@SetMissingFigureUp{Nedostaje}%
   \@todonotes@SetMissingFigureDown{slika}%
}
\DeclareOptionX{danish}{%
    \@todonotes@SetTodoListName{G\o{}rem\aa{}lsliste}%
    \@todonotes@SetMissingFigureText{Figur}%
    \@todonotes@SetMissingFigureUp{Manglende}%
    \@todonotes@SetMissingFigureDown{figur}%
}
\DeclareOptionX{dutch}{%
   \@todonotes@SetTodoListName{Lijst van onafgewerkte taken}%
   \@todonotes@SetMissingFigureText{Figuur}%
   \@todonotes@SetMissingFigureUp{Ontbrekende}%
   \@todonotes@SetMissingFigureDown{figuur}%
}
\DeclareOptionX{english}{%
   \@todonotes@SetTodoListName{Todo list}%
   \@todonotes@SetMissingFigureText{Figure}%
   \@todonotes@SetMissingFigureUp{Missing}%
   \@todonotes@SetMissingFigureDown{figure}%
}
\DeclareOptionX{french}{%
    \@todonotes@SetTodoListName{Liste des points \`a traiter}%
    \@todonotes@SetMissingFigureText{Figure}%
    \@todonotes@SetMissingFigureUp{Figure}%
    \@todonotes@SetMissingFigureDown{manquante}%
    \@todonotes@reverseMissingFigureTrianglefalse
}
\DeclareOptionX{german}{%
    \@todonotes@SetTodoListName{Liste der noch zu erledigenden Punkte}%
    \@todonotes@SetMissingFigureText{Abbildung}%
    \@todonotes@SetMissingFigureUp{Fehlende}%
    \@todonotes@SetMissingFigureDown{Abbildung}%
}
\DeclareOptionX{italian}{
    \@todonotes@SetTodoListName{Elenco delle cose da fare}%
    \@todonotes@SetMissingFigureText{Figura}%
    \@todonotes@SetMissingFigureUp{Figura}%
    \@todonotes@SetMissingFigureDown{mancante}%
}
\DeclareOptionX{ngerman}{%
    \@todonotes@SetTodoListName{Liste der noch zu erledigenden Punkte}%
    \@todonotes@SetMissingFigureText{Abbildung}%
    \@todonotes@SetMissingFigureUp{Fehlende}%
    \@todonotes@SetMissingFigureDown{Abbildung}%
}
\DeclareOptionX{portuguese}{
    \@todonotes@SetTodoListName{Lista de tarefas pendentes}%
    \@todonotes@SetMissingFigureText{Figura}%
    \@todonotes@SetMissingFigureUp{Figura}%
    \@todonotes@SetMissingFigureDown{pendente}%
}
\DeclareOptionX{spanish}{
    \@todonotes@SetTodoListName{Lista de tareas pendientes}%
    \@todonotes@SetMissingFigureText{Figura}%
    \@todonotes@SetMissingFigureUp{Figura}%
    \@todonotes@SetMissingFigureDown{pendiente}%
}
\DeclareOptionX{swedish}{%
    \@todonotes@SetTodoListName{Att g\"{o}ra-lista}%
    \@todonotes@SetMissingFigureText{Figur}%
    \@todonotes@SetMissingFigureUp{Figur}%
    \@todonotes@SetMissingFigureDown{saknas}%
}
%    \end{macrocode}
% Create a counter, for storing the number of inserted todos.
%    \begin{macrocode}
\newcounter{@todonotes@numberoftodonotes}
%    \end{macrocode}
% Create a counter, for storing the number of lines in the current todoarea.
%    \begin{macrocode}
\newcounter{@todonotes@numberofLinesInArea}
%    \end{macrocode}
% Toggle whether the package should obey the global draft option.
%    \begin{macrocode}
\newif{\if@todonotes@obeyDraft}
\DeclareOptionX{obeyDraft}{\@todonotes@obeyDrafttrue}
\newif{\if@todonotes@isDraft}
\DeclareOptionX{draft}{\@todonotes@isDrafttrue}
\DeclareOptionX{draftcls}{\@todonotes@isDrafttrue}
\DeclareOptionX{draftclsnofoot}{\@todonotes@isDrafttrue}
\newif{\if@todonotes@obeyFinal}
\DeclareOptionX{obeyFinal}{\@todonotes@obeyFinaltrue}
\newif{\if@todonotes@isFinal}
\DeclareOptionX{final}{\@todonotes@isFinaltrue}
%    \end{macrocode}
% 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).
%    \begin{macrocode}
\newif{\if@todonotes@disabled}
\DeclareOptionX{disable}{\@todonotes@disabledtrue}
%    \end{macrocode}
% Show small boxes in the list of todos with the color of the
% inserted todonotes.
%    \begin{macrocode}
\newif{\if@todonotes@colorinlistoftodos}
\DeclareOptionX{colorinlistoftodos}{\@todonotes@colorinlistoftodostrue}
%    \end{macrocode}
% We only define dvistyle for compatibility with todonotes. 
% The option was intented for use with \texttt{tex}, there should be no problems
% using \texttt{luatex}.
% So we ignore this option and issue a warning.
%    \begin{macrocode}
\DeclareOptionX{dvistyle}{\PackageWarningNoLine{luatodonotes}
    {Parameter dvistyle is not supported by luatodonotes.
    Ignoring this option}}
%    \end{macrocode}
% Create a color option.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {color}{
        \renewcommand{\@todonotes@backgroundcolor}{#1}
        \renewcommand{\@todonotes@linecolor}{#1}}
%    \end{macrocode}
% Make the background color of the notes as
% an option.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {backgroundcolor}{\renewcommand{\@todonotes@backgroundcolor}{#1}}
%    \end{macrocode}
% Make the line color of the notes as
% an option.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {linecolor}{\renewcommand{\@todonotes@linecolor}{#1}}
%    \end{macrocode}
% Make the color of the notes box color as
% an option.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {bordercolor}{\renewcommand{\@todonotes@bordercolor}{#1}}
%    \end{macrocode}
% Make the width of the leader line as
% an option.
% It is later set as \texttt{line width} in TikZ.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {leaderwidth}{\renewcommand{\@todonotes@leaderwidth}{#1}}
%    \end{macrocode}
% Set whether short captions given as arguments to the todo command
% should be included in the inserted todonote.
%    \begin{macrocode}
\newif{\if@todonotes@prependcaptionglobal}
\@todonotes@prependcaptionglobalfalse
\DeclareOptionX{prependcaption}{\@todonotes@prependcaptionglobaltrue}
%    \end{macrocode}
% This option is only there for compatibility with todonotes.
% We ignore it and issue a warning because the width of our labels is
% determined dynamically based on the page layout.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {textwidth}{\PackageWarningNoLine{luatodonotes}
    {Parameter textwidth is not supported by luatodonotes}}
%    \end{macrocode}
% Make the text size as an option. It requires some magic with the 
% |\csname| and |\endcsname| macros, as commands cannot be taken as
% options for a package.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {textsize}{\renewcommand{\@todonotes@textsize}{\csname #1\endcsname}}
%    \end{macrocode}
% Add option for shadows behind the inserted notes
%    \begin{macrocode}
\newif{\if@todonotes@shadowenabled}
\@todonotes@shadowenabledfalse
\DeclareOptionX{shadow}{\@todonotes@shadowenabledtrue
\usetikzlibrary{shadows}}
%    \end{macrocode}
% Add option for the default width of the figure inserted with
% |\missingfigure|.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {figwidth}{\renewcommand{\@todonotes@figwidth}{#1}}
\define@key{luatodonotes.sty}%
    {figheight}{\renewcommand{\@todonotes@figheight}{#1}}
\define@key{luatodonotes.sty}%
    {figcolor}{\renewcommand{\@todonotes@figcolor}{#1}}
%    \end{macrocode}
% \begin{macro}{s,bezier,opo,po}
% Provide shorthand options for the most common leader styles.
% \changes{0.3}{2015/12/03}{Provide shorthand commands for most common leader
% styles}
%    \begin{macrocode}
\DeclareOptionX{po}%
    {\setkeys{luatodonotes.sty}{leadertype=po,positioning=poLeadersAvoidLines}}
\DeclareOptionX{s}%
    {\setkeys{luatodonotes.sty}{leadertype=s,positioning=sLeaderNorthEastBelowStacks}}
\DeclareOptionX{bezier}%
    {\setkeys{luatodonotes.sty}{leadertype=sBezier,positioning=sLeaderNorthEastBelowStacks}}
\DeclareOptionX{opo}%
    {\setkeys{luatodonotes.sty}{leadertype=opo,positioning=inputOrderStacks}}
%    \end{macrocode}
% \end{macro}
% Specify the name of the algorithm used to specify the position of the labels.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {positioning}{\renewcommand{\@todonotes@positioning}{#1}}
%    \end{macrocode}
% Specify the name of the algorithm used to split the notes for left and right side.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {splitting}{\renewcommand{\@todonotes@splitting}{#1}}
%    \end{macrocode}
% Specify the type of leaders that are drawn.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {leadertype}{\renewcommand{\@todonotes@leadertype}{#1}}
%    \end{macrocode}
% Specify the vertical distance between the notes.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {interNoteSpace}{\renewcommand{\@todonotes@interNoteSpace}{#1}}
%    \end{macrocode}
% Specify the distance from the text inside the notes to the border.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {noteInnerSep}{\renewcommand{\@todonotes@noteInnerSep}{#1}}
%    \end{macrocode}
% Specify the width of the routing area used for $opo$- and $os$-leaders.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {routingAreaWidth}{\renewcommand{\@todonotes@routingAreaWidth}{#1}}
%    \end{macrocode}
% Minimum width of notes in one margin beside the text to be considered for
% label placement.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {minNoteWidth}{\renewcommand{\@todonotes@minNoteWidth}{#1}}
%    \end{macrocode}
% Specify horizontal distance from the notes to the borders of the page.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {distanceNotesPageBorder}%
    {\renewcommand{\@todonotes@distanceNotesPageBorder}{#1}}
%    \end{macrocode}
% Specify the horizontal distance between the notes and the text area.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {distanceNotesText}{\renewcommand{\@todonotes@distanceNotesText}{#1}}
%    \end{macrocode}
% Specify the height of the raster used for the $po$-leader algorithm.
%    \begin{macrocode}
\define@key{luatodonotes.sty}%
    {rasterHeight}{\renewcommand{\@todonotes@rasterHeight}{#1}}
%    \end{macrocode}
% \begin{macro}{additionalMargin}
% Control whether the margin should be enlarged for the notes and its width.
% \changes{0.3}{2015/12/01}{Introduce package option \texttt{additionalMargin}}
% \changes{0.4}{2016/04/01}{Fixed problems of the \texttt{additionalMargin}
% option with certain documentclasses}
% \changes{0.5}{2017/11/21}{Make \texttt{additionalMargin} compatible with
% \texttt{\textbackslash newgeometry}}
% \changes{0.5}{2020/01/19}{Adapt to new LuaTeX versions, which provide command
% \texttt{\textbackslash pagewidth} instead of
% \texttt{\textbackslash pdfpagewidth} (but stay backwards compatible)}
%    \begin{macrocode}
\newif{\if@todonotes@additionalMarginEnabled}
\@todonotes@additionalMarginEnabledfalse
\define@key{luatodonotes.sty}%
    {additionalMargin}[\@todonotes@additionalMargin]{%
        \@todonotes@additionalMarginEnabledtrue
        \renewcommand{\@todonotes@additionalMargin}{#1}}
%    \end{macrocode}
% \end{macro}
% This option is used to activate debug mode.
% Luatex prints more verbose output to the commandline in this mode.
% Furthermore, some of the algorithms also print debugging hints onto the
% output page.
%    \begin{macrocode}
\newif{\if@todonotes@debugenabled}
\@todonotes@debugenabledfalse
\DeclareOptionX{debug}{\@todonotes@debugenabledtrue}
%    \end{macrocode}
% Finally process the given options.
%    \begin{macrocode}
\ProcessOptionsX*
%    \end{macrocode}
% If the |obeyDraft| is given, check whether one of the |draft|, 
% |draftcls| or |draftclsnofoot|
% options are given and enable or disable the functionality of this
% package.
% If the |obeyFinal| option is given together with the |final| option
% the todonotes are disabled.
% The |disable| option will overrule the effect of |obeyDraft|.
%    \begin{macrocode}
\if@todonotes@disabled
\else
    \if@todonotes@obeyDraft
        \@todonotes@disabledtrue
        \if@todonotes@isDraft
            \@todonotes@disabledfalse
        \fi
    \fi
    \if@todonotes@obeyFinal
        \@todonotes@disabledfalse
        \if@todonotes@isFinal
            \@todonotes@disabledtrue
        \fi
    \fi
\fi
%    \end{macrocode}
% If the option |additionalMargin| is given, we enlarge the margins for the notes.
%    \begin{macrocode}
\if@todonotes@additionalMarginEnabled
    \newlength{\@todonotes@modpaperwidth}
    \AfterEndPreamble{%
        \@todonotes@setAdditionalMargin%
%    \end{macrocode}
% Additionally, if the |geometry| package is loaded we hook into
% |\Gm@changelayout| to repeat this computation whenever |\newgeometry| is
% called.
%    \begin{macrocode}
        \ifdefined\Gm@changelayout
            \g@addto@macro{\Gm@changelayout}{\@todonotes@setAdditionalMargin}
        \fi
    }%
\fi%
%    \end{macrocode}
% We simply increase the page size by the doubled value of |additionalMargin|
% and move the contents to the right using |\hoffset|.
%    \begin{macrocode}
\newcommand{\@todonotes@setAdditionalMargin}{
    \setlength{\@todonotes@modpaperwidth}{\paperwidth}%
    \addtolength{\@todonotes@modpaperwidth}{\@todonotes@additionalMargin}%
    \addtolength{\@todonotes@modpaperwidth}{\@todonotes@additionalMargin}%
    \ifdefined\pdfpagewidth\else\let\pdfpagewidth\pagewidth\fi
    \pdfpagewidth=\@todonotes@modpaperwidth%
    \addtolength{\hoffset}{\@todonotes@additionalMargin}%
}
%    \end{macrocode}
% \subsection{Initialisation of our Lua code}
% In this part we define some of the variables used by Lua depending on the
% package options and do some other initialisation tasks.
%
% We first need some temporary dimensions, which are written by \TeX\ and read
% from Lua.
% We use dimensions here because it is easier to access \TeX\ dimensions from
% Lua than \LaTeX\ lengths.
% We use |tex.dimen| in Lua to access dimensions.
% The first dimensions are used when extracting the absolute coordinates of a
% position on the page.
%    \begin{macrocode}
\newdimen\@todonotes@extractx
\newdimen\@todonotes@extracty
%    \end{macrocode}
% The following savebox and dimensions are used to calculate the height of a
% certain label.
% The box and dimensions are filled by \TeX\ and then read from Lua.
%    \begin{macrocode}
\newsavebox\@todonotes@heightcalcbox
\newdimen\@todonotes@heightcalcboxdepth
\newdimen\@todonotes@heightcalcboxheight
%    \end{macrocode}
% The following savebox is used to store the contents of a note and is then
% read from Lua.
%    \begin{macrocode}
\newsavebox\@todonotes@notetextbox
%    \end{macrocode}
% The following dimensions are used to read |\baselineskip|,
% |\normalbaselineskip| and |\f@size| from Lua.
% We need |\normalbaselineskip| as |\baselineskip| is set to 0 inside
% tabular cells.
% Dimension |\@todonotes@currentsidemargin| is set to the left margin,
% i.\,e., to the value of length |\oddsidemargin| or
% |\evensidemargin| depending on the type page.
% \changes{0.3}{2015/10/30}{Fix position of marker in table cells
% (\texttt{\textbackslash baselineskip} is empty inside tables)}
%    \begin{macrocode}
\newdimen\@todonotes@baselineskip
\newdimen\@todonotes@normalbaselineskip
\newdimen\@todonotes@fontsize
\newdimen\@todonotes@currentsidemargin
%    \end{macrocode}
% Loading our main Lua file.
%    \begin{macrocode}
\directlua{require("luatodonotes")}
%    \end{macrocode}
% Setting variables to values given by package options.
%    \begin{macrocode}
\directlua{luatodonotes.noteInnerSep =
    string.todimen("\luatexluaescapestring{\@todonotes@noteInnerSep}")}
\directlua{luatodonotes.noteInterSpace =
    string.todimen("\luatexluaescapestring{\@todonotes@interNoteSpace}")}
\directlua{luatodonotes.routingAreaWidth =
    string.todimen("\luatexluaescapestring{\@todonotes@routingAreaWidth}")}
\directlua{luatodonotes.minNoteWidth =
    string.todimen("\luatexluaescapestring{\@todonotes@minNoteWidth}")}
\directlua{luatodonotes.distanceNotesPageBorder =
    string.todimen("\luatexluaescapestring{\@todonotes@distanceNotesPageBorder}")}
\directlua{luatodonotes.distanceNotesText =
    string.todimen("\luatexluaescapestring{\@todonotes@distanceNotesText}")}
\directlua{luatodonotes.rasterHeight =
    string.todimen("\luatexluaescapestring{\@todonotes@rasterHeight}")}
%    \end{macrocode}
% Set the variables for the used algorithms and leader types depending on the
% corresponding package options.
%    \begin{macrocode}
\directlua{luatodonotes.setPositioningAlgo("\luatexluaescapestring{\@todonotes@positioning}")}
\directlua{luatodonotes.setSplittingAlgo("\luatexluaescapestring{\@todonotes@splitting}")}
\directlua{luatodonotes.setLeaderType("\luatexluaescapestring{\@todonotes@leadertype}")}
%    \end{macrocode}
% The following commands are used to detect the absolute positions of lines on
% the page.
%
% We first need to define a command to be able to insert the position from
% |\pdflastypos| into a write-whatsit in Lua.
% We need this workaround because we cannot insert |\pdflastypos| directly into
% the tokenlist in the Lua callback \texttt{callbackOutputLinePositions()}.
%    \begin{macrocode}
\ifdefined\pdflastypos\else\let\pdflastypos\lastypos\fi
\def\@todonotes@pdflastypos{\the\pdflastypos}
%    \end{macrocode}
% The following commands are written to the temporary \texttt{lpo}-file.
% When reading this file we call a Lua function for each line in the file and
% thus can collect the line positions in a Lua table.
%    \begin{macrocode}
\newcommand{\@todonotes@lineposition}[3]{%
    \directlua{luatodonotes.linePositionsAddLine(#1,#2,#3)}%
}
\newcommand{\@todonotes@nextpage}{%
    \directlua{luatodonotes.linePositionsNextPage()}%
}%
%    \end{macrocode}
% The following macro is used in \texttt{AtBeginShipout} to signal in the
% \texttt{lpo}-file that a new page is started.
%    \begin{macrocode}
\newcommand{\@todonotes@writeNextpageToLpo}{%
    \ifdefined\tf@lpo%
        \immediate\write\tf@lpo{\@backslashchar @todonotes@nextpage}%
    \fi
}
%    \end{macrocode}
% Depending on the debug-option of the package we set the corresponding Lua
% variable here.
% Additionally, we prepare to print our notes and leaders in foreground when in
% debug mode.
%    \begin{macrocode}
\if@todonotes@debugenabled
    \directlua{luatodonotes.todonotesDebug = true}
    \newcommand{\@todonotes@AtBeginShipoutUpperLeft}
        {\AtBeginShipoutUpperLeftForeground}
\else
    \directlua{luatodonotes.todonotesDebug = false}
    \newcommand{\@todonotes@AtBeginShipoutUpperLeft}
        {\AtBeginShipoutUpperLeft}
\fi
%    \end{macrocode}
% Define commands that are used for every tikzpicture to disable
% externalization.
% We only call the |\tikzexternaldisable| command if it is defined (i.e., the
% externalization library for TikZ is loaded).
% Externalization is reenabled after the end of the group (if it was enabled
% before).
% \changes{0.5}{2018/04/08}{Disable TikZ externalization for our tikzpictures}
%    \begin{macrocode}
\newcommand{\@todonotes@before@tikzpict}{\begingroup%
    \ifdefined\tikzexternaldisable\tikzexternaldisable\fi}
\newcommand{\@todonotes@after@tikzpict}{\endgroup}
%    \end{macrocode}
% Initialise the script when all Lua variables are set according to the package
% options.
%    \begin{macrocode}
\directlua{luatodonotes.initTodonotes()}
%    \end{macrocode}
% Some definitions to highlight areas in text.
% The first command is needed to accept control spaces (|\ |) in arguments for
% soul commands.
% After that we define the highlighting command used for todoareas.
%    \begin{macrocode}
\soulregister{\ }{0}
\newlength{\todonotes@textmark@width}
\newlength{\todonotes@textmark@fontsize}
\newlength{\todonotes@textmark@linebelow}
\newlength{\todonotes@textmark@lineabove}
\ulposdef{\todonotes@textmark@highlight}{%
    \setlength\todonotes@textmark@width\ulwidth%
    \setlength\todonotes@textmark@fontsize{\f@size pt}%
    \stepcounter{@todonotes@numberofLinesInArea}%
    \ifulstarttype{0}%
        {% begin of area
        \def\todonotes@textmark@decoLeft{}%
        \def\todonotes@textmark@shift{-2pt}%
        \addtolength\todonotes@textmark@width{2pt}%
        \setcounter{@todonotes@numberofLinesInArea}{1}}%
        {\def\todonotes@textmark@decoLeft{@todonotes@todoarea}%
        \def\todonotes@textmark@shift{-4pt}%
        \addtolength\todonotes@textmark@width{4pt}}%
    \ifulendtype{0}%
        {% last line of area
        \def\todonotes@textmark@decoRight{}%
        \addtolength\todonotes@textmark@width{2pt}%
        \directlua{luatodonotes.processLastLineInTodoArea()}}%
        {\def\todonotes@textmark@decoRight{@todonotes@todoarea}%
        \addtolength\todonotes@textmark@width{4pt}}%
    \newcommand{\@todonotes@nodeNamePrefix}%
        {@todonotes@\arabic{@todonotes@numberoftodonotes}%
         @\arabic{@todonotes@numberofLinesInArea} }%
    \hspace*{\todonotes@textmark@shift}{\smash{%
        \@todonotes@before@tikzpict%
        \begin{tikzpicture}[overlay,remember picture,
            deco/.style={}]%
            \setlength\todonotes@textmark@linebelow%
                {-0.95\dimexpr\baselineskip-\f@size pt\relax}%
            \setlength\todonotes@textmark@lineabove%
                {\dimexpr\f@size pt+\todonotes@textmark@linebelow\relax}%
            \coordinate
                (\@todonotes@nodeNamePrefix areaSW)
                at (0,\todonotes@textmark@linebelow);
            \coordinate
                (\@todonotes@nodeNamePrefix areaSE)
                at (\todonotes@textmark@width, \todonotes@textmark@linebelow);
            \coordinate
                (\@todonotes@nodeNamePrefix areaNE)
                at (\todonotes@textmark@width,\todonotes@textmark@lineabove);
            \coordinate
                (\@todonotes@nodeNamePrefix areaNW)
                at (0,\todonotes@textmark@lineabove);
            \draw[draw=green!70,fill=green,fill opacity=.2]
                (\@todonotes@nodeNamePrefix areaSW)
                decorate[\todonotes@textmark@decoLeft] {
                    -- (\@todonotes@nodeNamePrefix areaNW)
                }
                -- (\@todonotes@nodeNamePrefix areaNE)
                decorate[\todonotes@textmark@decoRight] {
                    -- (\@todonotes@nodeNamePrefix areaSE)
                }
                -- cycle;
        \end{tikzpicture}%
        \@todonotes@after@tikzpict%
    }}%
}%
%    \end{macrocode}
% \subsection{Options for the todo command}
%
% In this part the various options for 
% commands in the package are defined.
% Set an arbitrarily fill color
%    \begin{macrocode}
\newcommand{\@todonotes@currentlinecolor}{}%
\newcommand{\@todonotes@currentbackgroundcolor}{}%
\newcommand{\@todonotes@currentbordercolor}{}%
\define@key{todonotes}{color}{%
    \renewcommand{\@todonotes@currentlinecolor}{#1}%
    \renewcommand{\@todonotes@currentbackgroundcolor}{#1}}%
\define@key{todonotes}{linecolor}{%
    \renewcommand{\@todonotes@currentlinecolor}{#1}}%
\define@key{todonotes}{backgroundcolor}{%
    \renewcommand{\@todonotes@currentbackgroundcolor}{#1}}%
\define@key{todonotes}{bordercolor}{%
    \renewcommand{\@todonotes@currentbordercolor}{#1}}%
\newcommand{\@todonotes@currentleaderwidth}{}%
\define@key{todonotes}{leaderwidth}{%
    \renewcommand{\@todonotes@currentleaderwidth}{#1}}%
%    \end{macrocode}
% Set a relative font size
%    \begin{macrocode}
\newcommand{\@todonotes@sizecommand}{}%
\define@key{todonotes}{size}{\renewcommand{\@todonotes@sizecommand}{#1}}%
%    \end{macrocode}
% Should the todo item be disabled?
%    \begin{macrocode}
\newif\if@todonotes@localdisable%
\define@key{todonotes}{disable}[]{\@todonotes@localdisabletrue}%
\define@key{todonotes}{nodisable}[]{\@todonotes@localdisablefalse}%
%    \end{macrocode}
% Should the todo item be included in the list of todos?
%    \begin{macrocode}
\newif\if@todonotes@appendtolistoftodos%
\define@key{todonotes}{list}[]{\@todonotes@appendtolistoftodostrue}%
\define@key{todonotes}{nolist}[]{\@todonotes@appendtolistoftodosfalse}%
%    \end{macrocode}
% Should the todo item be displayed inline?
%    \begin{macrocode}
\newif\if@todonotes@inlinenote%
\define@key{todonotes}{inline}[]{\@todonotes@inlinenotetrue}%
\define@key{todonotes}{noinline}[]{\@todonotes@inlinenotefalse}%
%    \end{macrocode}
%    \begin{macrocode}
\newif\if@todonotes@prependcaption%
\define@key{todonotes}{prepend}[]{\@todonotes@prependcaptiontrue}%
\define@key{todonotes}{noprepend}[]{\@todonotes@prependcaptionfalse}%
%    \end{macrocode}
% Should the note in the margin be connected to the insertion point
% in the text?
%    \begin{macrocode}
\newif\if@todonotes@line%
\define@key{todonotes}{line}[]{\@todonotes@linetrue}%
\define@key{todonotes}{noline}[]{\@todonotes@linefalse}%
%    \end{macrocode}
% Only here for compatibility with todonotes.
% We don't need the fancy lines because we have more advanced drawing styles.
% So we ignore this option and issue a warning.
%    \begin{macrocode}
\define@key{todonotes}{fancyline}[]{\PackageWarningNoLine{luatodonotes}
    {Parameter fancyline is not supported by luatodonotes}}%
\define@key{todonotes}{nofancyline}[]{}%
%    \end{macrocode}
% Author option.
%    \begin{macrocode}
\newcommand{\@todonotes@author}{}%
\newif\if@todonotes@authorgiven%
\define@key{todonotes}{author}{%
    \renewcommand{\@todonotes@author}{#1}%
    \@todonotes@authorgiventrue}%
\define@key{todonotes}{noauthor}[]{\@todonotes@authorgivenfalse}%
%    \end{macrocode}
% Should the text in the list of todos be different from the text
% in the todonote?
%    \begin{macrocode}
\newcommand{\@todonotes@caption}{}%
\newif\if@todonotes@captiongiven%
\define@key{todonotes}{caption}%
    {\renewcommand{\@todonotes@caption}{#1}%
    \@todonotes@captiongiventrue}%
\define@key{todonotes}{nocaption}[]{\@todonotes@captiongivenfalse}%
%    \end{macrocode}
% Change the current figure width and height.
%    \begin{macrocode}
\newcommand{\@todonotes@currentfigwidth}{\@todonotes@figwidth}
\define@key{todonotes}%
    {figwidth}{\renewcommand{\@todonotes@currentfigwidth}{#1-2pt}}
\newcommand{\@todonotes@currentfigheight}{\@todonotes@figheight}
\define@key{todonotes}%
    {figheight}{\renewcommand{\@todonotes@currentfigheight}{#1-2pt}}
\newcommand{\@todonotes@currentfigcolor}{\@todonotes@figcolor}
\define@key{todonotes}%
    {figcolor}{\renewcommand{\@todonotes@currentfigcolor}{#1}}
%    \end{macrocode}
% Preset values of the options
%    \begin{macrocode}
\presetkeys%
    {todonotes}%
    {linecolor=\@todonotes@linecolor,%
    backgroundcolor=\@todonotes@backgroundcolor,%
    bordercolor=\@todonotes@bordercolor,%
    leaderwidth=\@todonotes@leaderwidth,%
    nodisable,%
    noinline,%
    nocaption,%
    noauthor,%
    figwidth=\@todonotes@figwidth,%
    figheight=\@todonotes@figheight,%
    figcolor=\@todonotes@figcolor,%
    line, list, size=\@todonotes@textsize}{}%
%    \end{macrocode}
% \subsection{The main code part}
% Here are the actual macros defined.
% The following boolean is used to remember if |\todo| or |\todoarea|
% was called.
%    \begin{macrocode}
\newif\if@todonotes@areaselected%
%    \end{macrocode}
% The following token registers are used to access the data for a note (which
% is stored in macros) from Lua.
%    \begin{macrocode}
\newtoks\@todonotes@toks@currentlinecolor%
\newtoks\@todonotes@toks@currentbackgroundcolor%
\newtoks\@todonotes@toks@currentbordercolor%
\newtoks\@todonotes@toks@currentleaderwidth%
\newtoks\@todonotes@toks@sizecommand%
%    \end{macrocode}
% If the option "disable" was passed to the package
% define empty commands.
%    \begin{macrocode}
\if@todonotes@disabled%
    \newcommand{\listoftodos}[1][]{}
    \newcommand{\@todo}[2][]{}
    \newcommand{\@todoarea}[3][]{}
    \newcommand{\missingfigure}[2][]{}
\else % \if@todonotes@disabled
%    \end{macrocode}
% \begin{macro}{\listoftodos}
% Define the |\listoftodos| command and define the 
% appearance of the list of todos.
% \changes{0.3}{2015/11/16}{\texttt{\textbackslash listoftodos} didn't work
% with documentclass \texttt{llncs}}
% \changes{0.3}{2015/12/03}{Fix for \texttt{\textbackslash listoftodos} causing problems with
% \texttt{hyperref}}
%    \begin{macrocode}
\newcounter{todonotes@oldtocdepth}
\newcommand{\listoftodos}[1][\@todonotes@todolistname]{%
    \setcounter{todonotes@oldtocdepth}{\value{tocdepth}}%
    \setcounter{tocdepth}{1}%
    \@ifundefined{chapter}{\section*{#1}}{\chapter*{#1}} \@starttoc{tdo}%
    \setcounter{tocdepth}{\value{todonotes@oldtocdepth}}%
}
\newcommand{\l@todo}
    {\@dottedtocline{1}{0em}{2.3em}}
%    \end{macrocode}
% \end{macro}
% Define styles used by the todo command.
% Colors are set directly when placing the notes.
%    \begin{macrocode}
\tikzset{@todonotes@todoarea/.style={
    decoration={snake,amplitude=3.5pt,segment length=5pt}}}
\tikzset{@todonotes@notestyleraw/.style={
    line width=0.5pt,
    inner sep = \@todonotes@noteInnerSep,
    rounded corners=4pt}}
%    \end{macrocode}
% Add shadows and rounded corners to the inserted todonotes.
%    \begin{macrocode}
\if@todonotes@shadowenabled
    \tikzset{@todonotes@notestyle/.style={@todonotes@notestyleraw,
        general shadow={shadow xshift=.5ex, shadow yshift=-.5ex,
        opacity=1,fill=black!50}}}
\else
    \tikzset{@todonotes@notestyle/.style={@todonotes@notestyleraw}}
\fi
\tikzset{@todonotes@leader/.style={}}
\tikzset{@todonotes@textmark/.style={rounded corners}}
\tikzset{@todonotes@inlinenote/.style={
    @todonotes@notestyle,
    draw=\@todonotes@currentbordercolor,
    fill=\@todonotes@currentbackgroundcolor,
    text width=\linewidth - 1.6 ex - 1 pt}}
%    \end{macrocode}
% \begin{macro}{\@todocommon}
%   Common macro used from |\@todo| and |\@todoarea|.
%   Used to actually draw/save the note.
%    \begin{macrocode}
\newcommand{\@todocommon}[2]{%
%    \end{macrocode}
% Use the global value for determining the default prepend behavior.
%    \begin{macrocode}
\if@todonotes@prependcaptionglobal%
\@todonotes@prependcaptiontrue%
\else%
\@todonotes@prependcaptionfalse%
\fi%
%    \end{macrocode}
% Store the original text for later usage and parse the given options.
%    \begin{macrocode}
\renewcommand{\@todonotes@text}{#2}%
\renewcommand{\@todonotes@caption}{#2}%
\setkeys{todonotes}{#1}%
%    \end{macrocode}
% If the option |disable| is given to the command, no output is generated.
%    \begin{macrocode}
\if@todonotes@localdisable%
\else%
%    \end{macrocode}
% Add the item to the list of todos. When the option
% |colorinlistoftodos| is given to the package a small colored 
% square is added in front of the text.
%    \begin{macrocode}
\addtocounter{@todonotes@numberoftodonotes}{1}%
\if@todonotes@appendtolistoftodos%
    \phantomsection%
    \if@todonotes@captiongiven%
    \else%
        \renewcommand{\@todonotes@caption}{#2}%
    \fi%
    \@todonotes@addElementToListOfTodos%
\fi%
%    \end{macrocode}
% Prepend the short caption given if it is requested
%    \begin{macrocode}
\if@todonotes@captiongiven%
    \if@todonotes@prependcaption%
        \renewcommand{\@todonotes@text}{\@todonotes@caption: #2}%
    \fi%
\fi%
%    \end{macrocode}
% Place the todonote as indicated by the options (inline or in a
% marginpar), below is the code for the inline placement.
%    \begin{macrocode}
\if@todonotes@inlinenote%
    \@todonotes@drawInlineNote%
\else%
    \@todonotes@drawMarginNoteWithLine%
\fi%\if@todonotes@inlinenote
\fi%\if@todonotes@localdisable
}%
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\@todo}
%   Command that draws normal notes.
%    \begin{macrocode}
\newcommand{\@todo}[2][]{%
    \@todonotes@areaselectedfalse%
    \@todocommon{#1}{#2}%
}%
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\@todoarea}
%   Command that draws notes that highlight a certain area in text.
%    \begin{macrocode}
\newcommand{\@todoarea}[3][]{%
    \@todonotes@areaselectedtrue%
    \@todocommon{#1}{#2}%
    \todonotes@textmark@highlight{#3}%
%    \end{macrocode}
% Mark the end of the highlighted area with a Tikz coordinate.
% The begin is marked by |\@todocommon|.
%    \begin{macrocode}
    \@todonotes@before@tikzpict%
    \begin{tikzpicture}[remember picture, overlay]%
        \node [coordinate] (@todonotes@\arabic{@todonotes@numberoftodonotes} %
            inTextEnd) {};%
    \end{tikzpicture}%
    \@todonotes@after@tikzpict%
    \zref@label{@todonotes@\arabic{@todonotes@numberoftodonotes}@end}%
}%
%    \end{macrocode}
% \end{macro}
% \begin{macro}{drawMarginNoteWithLine}
% Define helper function |drawMarginNoteWithLine|.
%    \begin{macrocode}
\newcommand{\@todonotes@drawMarginNoteWithLine}{%
%    \end{macrocode}
% When the todonote should be placed inside a marginpar, the code
% below is applied.
% First is the current location in the document stored, this enables
% us later to connect this point with the inserted todonote.
%    \begin{macrocode}
    \@todonotes@before@tikzpict%
    \begin{tikzpicture}[remember picture, overlay]%
        \node [coordinate] (@todonotes@\arabic{@todonotes@numberoftodonotes} %
            inText) {};%
    \end{tikzpicture}%
    \@todonotes@after@tikzpict%
%    \end{macrocode}
% Update the dimensions to be accessed by Lua.
%    \begin{macrocode}
    \@todonotes@baselineskip=\baselineskip%
    \@todonotes@normalbaselineskip=\normalbaselineskip%
    \@todonotes@fontsize=\f@size pt%
%    \end{macrocode}
% Place a label at the site.
% We use this to query the page number, on which the note was placed.
%    \begin{macrocode}
    \zref@label{@todonotes@\arabic{@todonotes@numberoftodonotes}}%
%    \end{macrocode}
% Append author before the note text if one is given.
%    \begin{macrocode}
    \if@todonotes@authorgiven%
        \let\@todonotes@text@old=\@todonotes@text
        \renewcommand{\@todonotes@text}{\@todonotes@author: \@todonotes@text@old}%
    \fi%
%    \end{macrocode}
% We use edef here to get these macros fully expanded.
% After that we write them to a toks register and read them from Lua.
%    \begin{macrocode}
    \edef\@todonotes@tmp{\@todonotes@currentlinecolor}%
    \@todonotes@toks@currentlinecolor=\expandafter{\@todonotes@tmp}%
    \edef\@todonotes@tmp{\@todonotes@currentbackgroundcolor}%
    \@todonotes@toks@currentbackgroundcolor=\expandafter{\@todonotes@tmp}%
    \edef\@todonotes@tmp{\@todonotes@currentbordercolor}%
    \@todonotes@toks@currentbordercolor=\expandafter{\@todonotes@tmp}%
    \edef\@todonotes@tmp{\@todonotes@currentleaderwidth}%
    \@todonotes@toks@currentleaderwidth=\expandafter{\@todonotes@tmp}%
%    \end{macrocode}
% We cannot fully expand the size command (using |\edef| causes errors when
% compiling).
%    \begin{macrocode}
    \@todonotes@toks@sizecommand=\expandafter{\@todonotes@sizecommand}%
%    \end{macrocode}
% We store the text that should be shown in this note into a box and copy this
% box to a variable in Lua. The commands |\@parboxrestore|, |\@marginparreset|,
% |\@minipagefalse| and |\outer@nobreak| are copied from the definition of
% |\marginpar| in \LaTeX 2e to reset font settings, for example.
% This is important when a note is placed inside a theorem environment.
% \changes{0.2}{2015/02/20}{Reset font settings at begin of a todo note}
%    \begin{macrocode}
    \savebox\@todonotes@notetextbox{%
        \@parboxrestore
        \@marginparreset
        \@todonotes@sizecommand\@todonotes@text%
        \@minipagefalse
        \outer@nobreak
    }%
%    \end{macrocode}
% Prepare parameters and add the note to the list in Lua.
%    \begin{macrocode}
    \if@todonotes@line%
        \def\@todonotes@param@drawLeader{true}%
    \else%
        \def\@todonotes@param@drawLeader{false}%
    \fi%
    \if@todonotes@areaselected%
        \def\@todonotes@param@noteType{area}%
    \else%
        \def\@todonotes@param@noteType{}%
    \fi%
    \directlua{luatodonotes.addNoteToList(\arabic{@todonotes@numberoftodonotes},%
        \@todonotes@param@drawLeader,\luastringO{\@todonotes@param@noteType})}%
}%
%    \end{macrocode}
% \end{macro}
% \begin{macro}{addElementToListOfTodos}
% Define helper function |addElementToListOfTodos|.
%    \begin{macrocode}
\newcommand{\@todonotes@addElementToListOfTodos}{%
    \if@todonotes@colorinlistoftodos%
        \addcontentsline{tdo}{todo}{%
            \fcolorbox{\@todonotes@currentbordercolor}%
                {\@todonotes@currentbackgroundcolor}%
                {\textcolor{\@todonotes@currentbackgroundcolor}{o}}%
            \ \@todonotes@caption}%
    \else%
        \addcontentsline{tdo}{todo}{\@todonotes@caption}%
    \fi}%
%    \end{macrocode}
% \end{macro}
% \begin{macro}{drawInlineNote}
% Define helper function |drawInlineNote|.
%    \begin{macrocode}
\newcommand{\@todonotes@drawInlineNote}{%
    {\par\noindent%
        \@todonotes@before@tikzpict%
        \begin{tikzpicture}[remember picture]%
        \draw node[@todonotes@inlinenote,font=\@todonotes@sizecommand]{%
            \if@todonotes@authorgiven%
                {\noindent \@todonotes@sizecommand %
                    \@todonotes@author:\,\@todonotes@text}%
            \else%
                {\noindent \@todonotes@sizecommand \@todonotes@text}%
            \fi};%
        \end{tikzpicture}%
        \@todonotes@after@tikzpict%
    \par}%
    }%
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\missingfigure}
% Defines the |\missingfigure| macro.
%    \begin{macrocode}
\newcommand{\missingfigure}[2][]{%
\setkeys{todonotes}{#1}%
\addcontentsline{tdo}{todo}{\@todonotes@MissingFigureText: #2}%
\par
\noindent
\@todonotes@before@tikzpict%
\begin{tikzpicture}
\draw[fill=\@todonotes@currentfigcolor, draw = black!40, line width=2pt]
    (-2, -2.5) rectangle +(\@todonotes@currentfigwidth, \@todonotes@currentfigheight);
\draw (2, -0.3) node[right, text
    width=\@todonotes@currentfigwidth-4.5cm] {#2};
\draw[red, fill=white, rounded corners = 5pt, line width=10pt] 
    (30:2cm) -- (150:2cm) -- (270:2cm) -- cycle;
\draw (0, 0.3) node {\@todonotes@MissingFigureUp};
\draw (0, -0.3) node {\@todonotes@MissingFigureDown};
\end{tikzpicture}\hfill
\@todonotes@after@tikzpict%
}% Ending \missingfigure command
\fi% Ending \@todonotes@ifdisabled
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\todototoc}
% Inserts a reference to the list of todos in the table of contents. If |chapter| is defined, 
% |chapter| is used as level otherwise will |section| be used.
% The |\todototoc| command respects the disable option.
%    \begin{macrocode}
\newcommand{\todototoc}
{
    \if@todonotes@disabled
    \else
    \addcontentsline{toc}{\@ifundefined{chapter}{section}{chapter}}{\@todonotes@todolistname}
    \fi
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\todo}
% Define the |\todo| command as a redirection to |\@todo|.
%    \begin{macrocode}
\newcommand{\todo}[2][]{\@bsphack\@todo[#1]{#2}\@esphack\ignorespaces}%
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\todoarea}
% Define the |\todoarea| command as a redirection to |\@todoarea|.
% We don't want to ignore spaces after this command.
%    \begin{macrocode}
\newcommand{\todoarea}[3][]{\@bsphack\@todoarea[#1]{#2}{#3}\@esphack}%
%    \end{macrocode}
% \end{macro}
% The following commands are executed when a page is complete and is written to
% the output PDF (shipout in \TeX\ terms).
% The |\AtBeginShipout| command is provided by package atbegshi.
%    \begin{macrocode}
\if@todonotes@disabled
\else
\AtBeginShipout{%
%    \end{macrocode}
% We draw to the foreground or background of the page (depending if debug option
% is set for the package).
%    \begin{macrocode}
    \@todonotes@AtBeginShipoutUpperLeft{
        \@todonotes@writeNextpageToLpo
%    \end{macrocode}
% Determine if we are on a left or on a right side (important for margins) and
% set variables accordingly.
% |\relax| seems to be needed at end to really write new value for
% currentsidemargin.
%    \begin{macrocode}
        \checkoddpage%
        \ifoddpageoroneside%
            \@todonotes@currentsidemargin=\the\oddsidemargin%
        \else%
            \@todonotes@currentsidemargin=\the\evensidemargin%
        \fi\relax%
%    \end{macrocode}
% We switch to the default catcodes of \LaTeX\ here.
% This is important if catcodes are changed in the main text, e.\,g., by a
% verbatim environment at the end of the page.
%    \begin{macrocode}
        \BeginCatcodeRegime\CatcodeTableLaTeX
%    \end{macrocode}
% Calculates the areas, in which the labels can be placed.
% This calculation depends on currentsidemargin.
% So this has to be done inside |\AtBeginShipoutUpperLeft| (otherwise odd/even
% page detection won't work).
%    \begin{macrocode}
        \directlua{luatodonotes.calcLabelAreaDimensions()}%
%    \end{macrocode}
% Calculates the needed height for every note.
% This has to be outside of the tikzpicture because it uses a savebox to compute
% the height.
% This box does not work in the tikzpicture.
%    \begin{macrocode}
        \directlua{luatodonotes.calcHeightsForNotes()}% has to be outside of tikzpicture
%    \end{macrocode}
% Some classes modify the page margins using |\voffset| and |\hoffset|.
% Our |tikzpicture| would be aligned using this modified page origin.
% So we overrule the offsets using a |raisebox| and a negative |hspace|.
% \changes{0.3}{2015/11/30}{Consider defined values for \texttt{\textbackslash
% voffset} and \texttt{\textbackslash hoffset} to place the notes in the right
% position}
%    \begin{macrocode}
        \raisebox{\voffset}{%
            \hspace{-\hoffset}%
            \@todonotes@before@tikzpict%
            \begin{tikzpicture}[remember picture,overlay]
%    \end{macrocode}
% Reads the absolute coordinates of every note on the page and writes them to
% the Lua objects.
%    \begin{macrocode}
                \directlua{luatodonotes.getInputCoordinatesForNotes()}
%    \end{macrocode}
% Runs the positioning algorithm and actually draws the notes and leaders.
%    \begin{macrocode}
                \directlua{luatodonotes.printNotes()}
            \end{tikzpicture}%
            \@todonotes@after@tikzpict%
        }%
%    \end{macrocode}
% Delete the drawn notes from the Lua lists and prepare for the next page.
%    \begin{macrocode}
        \directlua{luatodonotes.clearNotes()}%
        \EndCatcodeRegime
    }%
}
\fi % Ending \@todonotes@ifdisabled
%    \end{macrocode}
%
% \newpage
% \Finale
\endinput

