path: root/Master/texmf-dist/source/latex/skdoc/skdoc.dtx

% \iffalse
%% skdoc documentation class
%%
%% Copyright (C) 2012-2013 by Simon Sigurdhsson <sigurdhsson@gmail.com>
%% 
%% This work may be distributed and/or modified under the
%% conditions of the LaTeX Project Public License, either version 1.3
%% 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 1.3 or later is part of all distributions of LaTeX
%% version 2005/12/01 or later.
%% 
%% This work has the LPPL maintenance status `maintained'.
%% 
%% The Current Maintainer of this work is Simon Sigurdhsson.
%% 
%% This work consists of the files skdoc.dtx
%% and the derived filebase skdoc.cls.
%
%<*ignore>
\begingroup
  \catcode123=1 %
  \catcode125=2 %
  \def\x{LaTeX2e}%
\expandafter\endgroup
\ifcase 0\ifx\install y1\fi\expandafter
        \ifx\csname processbatchFile\endcsname\relax\else1\fi
        \ifx\fmtname\x\else 1\fi\relax
\else\csname fi\endcsname
%</ignore>
%<*install>
\input docstrip.tex

\preamble
\endpreamble

\keepsilent
\askforoverwritefalse

\generate{%
    \file{skdoc.cls}{\from{skdoc.dtx}{class}}%
}

\begingroup
\obeyspaces
\Msg{*************************************************************}%
\Msg{*                                                           *}%
\Msg{* To finish the installation you have to move the following *}%
\Msg{* file into a directory searched by TeX:                    *}%
\Msg{*                                                           *}%
\Msg{*     skdoc.cls                                             *}%
\Msg{*                                                           *}%
\Msg{* To produce the documentation run the file skdoc.dtx       *}%
\Msg{* through LaTeX.                                            *}%
\Msg{*                                                           *}%
\Msg{* Happy TeXing!                                             *}%
\Msg{*                                                           *}%
\Msg{*************************************************************}%
\endgroup%

\endbatchfile
%</install>
%<*ignore>
\fi
%</ignore>
%<*class>
\RequirePackage{expl3}
%</class>
%<*driver>
\RequirePackage{xparse}
\ProvidesExplFile{skdoc.dtx}
%</driver>
%<class>\ProvidesExplClass{skdoc}
%<*class>
    {2013/11/28}{1.4a}{skdoc documentation class}
%</class>
%
%<*driver>
\msg_new:nnn{skdoc-dtx}{not-installed}
    {Run~`tex'~on~skdoc.dtx~before~generating~the~documentation!}
\IfFileExists{skdoc.cls}{}{
    \msg_fatal:nn{skdoc-dtx}{not-installed}
}
\cs_set_protected_nopar:Npn\ExplHack{
    \char_set_catcode_letter:n{ 58 }
    \char_set_catcode_letter:n{ 95 }
}
\ExplSyntaxOff
\DeclareDocumentCommand\MakePercentIgnore{}{\catcode`\%9\relax}
\DeclareDocumentCommand\MakePercentComment{}{\catcode`\%14\relax}
\DeclareDocumentCommand\DocInput{m}{
    \MakePercentIgnore\input{#1}\MakePercentComment
}
\documentclass[highlight=false]{skdoc}
\usepackage{hologo}
\usepackage{booktabs}
\usepackage{csquotes}
\usepackage[style=authoryear,backend=biber]{biblatex}
%%\usepackage{chslacite}
\begin{filecontents}{skdoc.bib}
@online{Lazarides12,
    author = {Yannis Lazarides},
    title = {Different approach to literate programming for \LaTeX},
    year = {2012},
    url = {http://tex.stackexchange.com/q/47237/66}
}
@online{Talbot13,
    author = {Nicola Talbot},
    title = {Answer to \enquote{Distinct formatted page numbers with glossaries and Xindy}},
    year = {2013},
    url = {http://tex.stackexchange.com/a/89830/66}
}
@manual{Rahtz10,
    author = {Sebastian Rahtz and Herbert Vo\ss},
    title = {The \enquote{\textsf{fancyvrb}} package},
    subtitle = {Fancy Verbatims in \LaTeX},
    date = {2012-05-15},
    version = {2.8},
    url = {http://mirrors.ctan.org/macros/latex/contrib/fancyvrb/fancyvrb.pdf}
}
\end{filecontents}
\addbibresource{skdoc.bib}
\OnlyDescription
\begin{document}
    \DocInput{skdoc.dtx}
\end{document}
% \fi
%
% \deftripstyle{skdoc-class}{}{}{}%
% {\small The~\textbf{\thepkg}~document~class,~\theversion}%
% {}{\small\pagemark}
% \pagestyle{skdoc-class}
%
% \version{1.4a}
% \changes{1.0}{Initial version}
% \changes{1.1}{Added support for syntax highlighting using \pkg{minted}}
% \changes{1.1a}{Deprecate the use of \pkg{bibtex} in favour of \pkg{biblatex}}
% \changes{1.2}{Use \pkg{l3prg} booleans instead of toggles}
% \changes{1.2b}{Use \pkg{inconsolata}. Don't use \pkg{ascii}}
% \changes{1.3}{Allow multiple targets per \env{MacroCode}}
% \changes{1.3b}{Use \pkg{sourcecodepro} instead of \pkg{inconsolata}. Fix issue with index entries of different types with same name}
% \changes{1.4}{Added option to control \pkg{babel}. Allow optional default value arguments in \env{macro} and friends. Fix spacing issue in \env{option} and friends}
% \changes{1.4a}{Fix various compatibility issues with latest \pkg{glossaries}}
% \iffalse
%%% Don't forget to update the version number and release date of
%%% the package declaration on line 76!
% \fi
%
% \package[ctan=skdoc,vcs=https://github.com/urdh/skdoc]{skdoc}
% \repository{https://github.com/urdh/skdoc}
% \title{The \thepkg{} document class}
% \author{Simon Sigurdhsson}
% \email{sigurdhsson@gmail.com}
% \maketitle
%
% \begin{abstract}
% The \thepkg{} class provides macros to document the functionality
% and implementation of \LaTeX\ packages and document classes. It is
% loosely based on the \pkg{ydoc} and \pkg{ltxdoc} classes, but has
% a number of incompatible differences.
%
% The class defines a \env{MacroCode} environment which substitutes
% the usual \pkg{docstrip} method of installing packages. It has the
% ability to generate both documentation and code in a single run of
% a single file.
% \end{abstract}
%
% \tableofcontents
%
% \section{Introduction}
% This document class, inspired by a question on the \TeX\ Stack
% Exchange\footcite{Lazarides12}, aims to provide an alternative to
% the standard \pkg{docstrip} method of literate programming for
% \LaTeX\ packages. It also aims to provide a more modern, appealing
% style for \LaTeX\ package documentation.
%
% In order to achieve this, it builds upon already existing features
% of the \pkg{expl3}, \pkg{verbatim} and \pkg{ydoc} packages as well
% as the KOMA-script document classes.
%
% So far it is mainly intended to be an experiment to explore a less
% cumbersome way of writing \LaTeX\ packages, and as such I give no
% guarantee that this package will continue to exist in a working
% state (\emph{i.e.} future users may not be able to extract code from
% package documentation based on \thepkg) or that its public API
% (commands and environments described by this documentation; consider
% undocumented macros part of a private API) will be stable.
%
% The documentation of \thepkg\ is in fact typeset using the class
% itself. It does not, however, make use of the main feature of this
% class (the \env{MacroCode} environment), because bootstrapping the
% class to generate itself is more complicated than it is useful.
%
% \section{Documentation}
% Since \thepkg\ is based on \pkg{ydoc} many of the macros and
% environment present in that package are also available in \thepkg,
% in a possibly redefined incanation. However, any macros or
% environment present in \pkg{ydoc} but not described in this
% documentation should be considered part of the private API of
% \thepkg. In the future, the removal of the \pkg{ydoc} dependency
% may result in such macros being unavailable, and at present changes
% made by \thepkg\ may break such macros without notice.
%
% \subsection{Options}
% \Option{load}\WithValues{\meta{package}}\AndDefault{\cs{jobname}}
% \label{ssec:options:load} The \opt{load}
% option declares that if the package specified exists, it should
% be loaded. This is intended to load any package provided in the
% implementation, but requires that the documentation provides
% stub variants of the macros used in the documentation so that
% \LaTeX\ still completes its first run.
%
% \Option{highlight}\WithValues{true,false}\AndDefault{true}
% \label{ssec:option:highlight}
% The \opt{highlight} option enables or disabled syntax highlighting
% of the implementation code. Highlighting is performed using
% \pkg{minted}, and falls back to no highlighting if there is no
% \cs{write18} access, if \pkg{minted} is unavailable or if the
% \texttt{pygmentize} binary can't be found.
% \Notice{On non-unix platforms, the test for \texttt{pygmentize}
% will likely fail. Therefore, syntax highlighting is not supported
% on such platforms.}
%
% Generally, there should be no reason to disable syntax highlighting
% unless the documentation describes a very large package, and the
% repeated calls to \texttt{pygmentize} take too long.
%
% \Option{babel}
% The \opt{babel} option allows you to specify what languages are loaded
% by the \pkg{babel} package. It is a key-value option, and its content
% is passed as options to the \pkg{babel} \cs*{usepackage} declaration.
%
% \subsection{General macros}
% The document class defines a number of general macros intended for
% use in parts of the document not strictly considered
% \enquote{documentation} or \enquote{implementation}, in addition to
% being used in those parts. These \enquote{general} macros include
% macros that define metadata, generate the title page, typeset
% notices or warnings and those that refer to macros, environments,
% packages and such.
%
% \subsubsection{Metadata}
% Several macros for defining metadata (\emph{i.e.} information about
% the package and its documentation) are made available. These mostly
% set an internal variable which is used to typeset the title page,
% and to insert PDF metadata whenever \hologo{pdfLaTeX} is used to
% generate the documentation.
%
% \DescribeMacro\package['ctan='<identifier>',vcs='<url>]{<package name>}
% The \cs{package} macro defines the package name used by \cs{thepkg},
% \cs{maketitle} and similar macros. It also calls \cs{title} to set
% a sensible default title based on the package name. The optional
% key-value argument takes two keys: \texttt{ctan} and \texttt{vcs}.
% The first one accepts an optional value \meta{identifier}, which
% should be the identifier the package has on CTAN (the default is
% \cs{jobname}), while the other takes a mandatory argument \meta{url}
% specifying the URL of a VCS repository where development versions
% of the package are available. The two optional keys imply calls to
% the \cs{ctan} and \cs{repository} macros, respectively.
%
% \DescribeMacro\version{<version>}
% Sets the version number of the package the documentation describes.
% Here, \meta{version} should not include the initial \enquote{v},
% \emph{i.e.} the argument should be the same as that given to
% \emph{e.g.} the \LaTeX3 \cs{ProvidesExplPackage} or the standard
% \pkg{ltxdoc} \cs{changes}.
%
% \DescribeMacro\ctan{<identifier>}
% As detailed above, this macro defines the CTAN identifier of the
% package, which is (optionally) used in the \cs{maketitle} macro.
%
% \DescribeMacro\repository{<url>}
% Again, as detailed above this macro defines the URL of a source code
% repository containing a development version of the package, which
% is optionally used by \cs{maketitle}.
%
% \DescribeMacro\author{<name>}
% Defines the name of the package author. This is used by
% \cs{maketitle} and is mandatory if \cs{maketitle} is used.
%
% \DescribeMacro\email{<email>}
% Defines the email of the package author. This is used by
% \cs{maketitle} and is mandatory if \cs{maketitle} is used.
%
% \DescribeMacro\title{<title>}
% Defines the package title. By default, the \cs{package} macro sets
% a sensible title that should suit most packages, but using \cs{title}
% will override this title (useful for \emph{e.g.} document classes or
% \hologo{BibTeX} styles).
%
% Three macros retrieving the set metadata are also available. They
% can be used to typeset the current version of the package, and the
% package name, respectively.
%
% \DescribeMacro\theversion
% Returns the version as defined by \cs{version}, with a leading
% \enquote{v}. That is, issuing \Macro\version{1.0} makes 
% \cs{theversion} print \enquote{v1.0}.
%
% \DescribeMacro\thepackage
% \DescribeMacro\thepkg
% The \cs{thepackage} and \cs{thepkg} macros return the package name
% as defined by the \cs{package} macro, enclosed in \cs{pkg*}. That is,
% the package name is typeset as a package but not indexed.
%
% \subsubsection{The preamble}
% The preamble of any documentation most often consists of a title page
% containing an abstract, and possibly a table of contents. The \thepkg
% \ package provides macros and environments that typeset such things,
% and these should be fully compatible with most other document classes.
%
% \DescribeMacro\maketitle
% The \cs{maketitle} macro typesets a title page. This title page uses
% the metadata defined by the macros described earlier, and typesets
% them in a manner which is illustrated by the documentation of this
% class. This style is inspired by \pkg{skrapport}, which is in turn
% inspired by the title pages of the Prac\TeX\ Journal.
%
% \DescribeEnv[<package abstract>]{abstract}
% The \env{abstract} environment typesets an abstract of the package.
% Again, its style is illustrated by this document and it is inspired
% by the \pkg{skrapport} package as well as the Prac\TeX\ Journal.
%
% \DescribeMacro\tableofcontents
% Finally, a Table of Contents may be printed. The actual table of
% contents is provided by the \pkg{scrartcl} document class, but \thepkg
% \ redefines a couple of the internal macros to style the Table of
% Contents in a manner similar to that of the \pkg{microtype} manual.
%
% \subsubsection{The LPPL license}
% \DescribeMacro\PrintLPPL
% If the LPPL license is present in a directory where \LaTeX\ can find
% it, in a file called \file{lppl.tex}, then \cs{PrintLPPL} will
% include the entire LPPL license in the document, and typeset it in
% a fairly compact manner.
%
% \subsubsection{Notices and warnings}
% The document class provides macros to indicate information that may
% be of extra importance in the documentation. Such information is
% categorized as either notices or warnings, which are treated
% differently.
% 
% \DescribeMacro\Notice{<notice>}
% A notice is a short piece of text that contains information that may
% explain some unexpected but unharmful behaviour of a macro or similar.
% It is typeset inline, emphasized and in parantheses --- as such, the
% sequence \Macro\Notice{a notice} yields \Notice{a notice}.
%
% \DescribeMacro\Warning{<warning>}
% A warning is a short comment that conveys information that the user
% must be aware of. This includes unexpected potentially harmful
% behaviour, deprecation notices and so on. It is typeset in its own
% \cs{fbox} --- the sequence \Macro\Warning{a warning} yields the
% following: \Warning{a warning}
%
% \DescribeMacro\LongWarning{<warning>}
% The \cs{LongWarning} macro is a variant of \cs{Warning} that has been
% adapted for longer texts, possibly including paragraph breaks. Like
% \cs{Warning}, it is typeset in a box: \LongWarning{a long warning}
%
% \subsubsection{Referential macros}\label{sec:ref-macros}
% The family of macros originating from \cs{cs} are used to typeset
% various concepts in running text. In addition to adhering to the
% general format of the corresponding concept, they index their
% argument. Each of these macros have a starred variant which does
% not index its argument; use these when appropriate.
%
% \DescribeMacro\cs{<command sequence>}
% Typesets a command sequence, or macro. The argument should be
% provided without the leading backslash, and the command sequence
% will be typeset in a monospaced font.
%
% \DescribeMacro\env{<environment name>}
% Typesets an environment name, which will be typeset in a monospace
% font.
%
% \DescribeMacro\pkg{<package name>}
% Typesets a package, document class or bundle name. The name will
% be typeset in a sans-serif font.
%
% \DescribeMacro\opt{<option>}
% Typesets a package or document class option. As of \theversion,
% options are typeset using a monospace font.
%
% \DescribeMacro\bib{<\hologo{BibTeX} entry type>}
% Typesets a \hologo{BibTeX} entry type. The agument should be provided
% without the leading \texttt{@} sign. The entry type will be typeset
% in a monospace font.
% 
% \DescribeMacro\thm{<theme name>}
% Typesets a theme name. As of \theversion, the theme name will be
% typeset in an upright serif font.
%
% \DescribeMacro\file{<filename>}
% Typesets a filename. As of \theversion, the filename will be typeset
% in a monospace font.
%
% \subsection{Documenting the package}\label{sec:doc-macros}
% The documentation part of any \LaTeX\ manual is arguably the most
% important one, and to facilitate proper typesetting of the
% documentation \thepkg\ povides a number of different macros, all
% inspired by or inherited from \pkg{ydoc}. The first of these
% macros that will be discussed are the macros that typeset differen
% kinds of arguments in running text.
%
% \DescribeMacro\meta{<meta text>}
% The \cs{meta} macro typesets a placeholder to be placed in an
% argument. This can be used to refer to arguments and contents of
% macros and environments described by commands discussed later in
% this documentation. It is typeset in brackets: \meta{meta text}.
%
% \DescribeMacro\marg{<mandatory argument>}
% \DescribeMacro\oarg{<optional argument>}
% \DescribeMacro\parg{<picture-style argument>}
% \DescribeMacro\aarg{<beamer-style argument>}
% \DescribeMacro\sarg
% These macros typeset different kinds of arguments (mandatory,
% optional, picture-style, beamer-style and star arguments,
% respetively). These can be used to describe arguments, but
% are mostly used internally. See table~\ref{tab:args} for
% examples of how these macros are typeset.
%
% \begin{table}[tb]
%   \centering
%   \caption{Typesetting arguments}
%   \label{tab:args}
%   \begin{tabular}{ll}
%      \toprule
%      Invokation            & Result          \\
%      \midrule
%      \Macro\marg{argument} & \marg{argument} \\
%      \Macro\oarg{argument} & \oarg{argument} \\
%      \Macro\parg{argument} & \parg{argument} \\
%      \Macro\aarg{argument} & \aarg{argument} \\
%      \Macro\sarg           & \sarg           \\
%      \bottomrule
%   \end{tabular}
% \end{table}
%
% \subsubsection{Examples}
% \DescribeEnv[<example code>]{example}
% Perhaps the most powerful way to illustrate features of a package
% is to show their function by examples. This is made possible by
% the \env{example} environment. By enclosing example code in this
% environment, the actual code is typeset next to the result it would
% produce, as seen below\footnote{Note that the showcased \env{example}
% environment doesn't contain another \env{example} environment --- the
% environment is not intended to be nested inside itself.}\footnote{The
% percent characters in the example are caused by the \pkg{docstrip}
% requirement of prefixing the documentation with them.}:
% \begin{example}
% Simply typesetting a
% \emph{paragraph} may
% be simple enough, but
% it should showcase
% the utility of the
% environment well enough.
% \end{example}
%
% Note that for this to work the package obviously needs to be loaded.
% As such, it is probably a good idea to combine the use of \env{example}
% with the \opt{load} option, so be sure to read up on the caveats of
% using that option (see page \pageref{ssec:options:load}).
%
% Since the \env{example} environment is based on the same mechanisms
% as \env{MacroCode}, (mostly) the same typesetting properties apply.
% In particular, the code will be highlighted if \pkg{minted} is
% available. \Notice{Since the backend utilizes \cs{verbatim}, the
% usual caveats apply. In particular, leaving whitespace before
% \cs{end}\marg{example} will result in an extra newline at the end
% of the displayed code.}
%
% \subsubsection{Options}
% Package options are of course important to describe, and to this
% end four macros are provided. They aid in describing options of
% both regular boolean and the more modern key-value syntax. They
% are intended to be used in a sequence: \\ 
% \mbox{\Macro\Option{...}
%       \AlsoMacro\WithValues{...}
%       \AlsoMacro\AndDefault{...}}
%
% \DescribeMacro\Option{<option>}
% \DescribeMacro\Options{<option>,...}
% These macros typeset an option, and may be followed by the
% \cs{WithValues} macro \Notice{the with \cs{Options}, only the
% first option in the list will work with \cs{WithValues}}.
%
% \DescribeMacro\WithValues{<value>,...}
% This macro typesets a comma-separated list of values a specific
% option can take. It may be followed by the \cs{AndDefault} macro.
%
% \DescribeMacro\AndDefault{<default value>}
% This macro typesets the default value of an option. It may follow
% either \cs{Options} or \cs{WithValues}.
%
% Common constructs using these macros include:
% \begin{itemize}
% \item \mbox{\small
%       \Macro\Option{<option>}
%       \AlsoMacro\WithValues{<value>,...}
%       \AlsoMacro\AndDefault{<default>}}
% \item \mbox{\small
%       \Macro\Options{<option>,no\meta{option}}
%       \AlsoMacro\AndDefault{no\meta{option}}}
% \end{itemize}
% 
% \subsubsection{Macros}
% The \thepkg\ class inherits a number of macros for describing the
% package macros from the \pkg{ydoc} package. Only four of them are
% to be considered stable.
% \LongWarning{
% The macros \cs{MakeShortMacroArgs} and \cs{DeleteShortMacroArgs}
% and the environments \env{DescribeMacros} and \env{DescribeMacrosTab}
% provided by \pkg{ydoc} are unsupported as of \thepkg\ \theversion. 
% They may work, but this is
% not a guarantee and they are most likely broken or may break other
% features of \thepkg.
% }
%
% \DescribeMacro\DescribeMacro<\textbackslash macro><macro arguments>
% The \cs{DescribeMacro} macro documents a macro along with its
% arguments. Any number of \meta{macro arguments} may follow the macro,
% and \cs{DescribeMacro} will stop reading arguments on the first
% non-argument token. The macro will be indexed.
% \LongWarning{Although \meta{\textbackslash macro} can include
% \texttt{@} signs, it is not possible to document \LaTeX3-style
% macros (with underscores and colons) without the following hack:
% \par \medskip \begingroup
% \cs*{ExplSyntaxOn} \\
% \cs*{cs\_set\_protected\_nopar:Npn}\cs*{ExplHack}\texttt{\{} \\
% \hspace*{2ex}\cs*{char\_set\_catcode\_letter:n}\texttt{\{~58~\}} \\
% \hspace*{2ex}\cs*{char\_set\_catcode\_letter:n}\texttt{\{~95~\}} \\
% \texttt{\}} \\
% \cs*{ExplSyntaxOff} \\
% \cs*{ExplHack} \\
% \endgroup }
%
% \DescribeMacro\Macro<\textbackslash macro><macro arguments>
% This is simply a variant of \cs{DescribeMacro} for use in running
% text. It is equivalent to \cs{MacroArgs}\cs{AlsoMacro}.
%
% \DescribeMacro\MacroArgs<macro aguments>
% This macro formats \meta{macro arguments} the same way
% \cs{DescribeMacro} does. As with \cs{Macro}, it is used in
% running text.
%
% \DescribeMacro\AlsoMacro<\textbackslash macro><further arguments>
% This macro should be used inside \meta{macro arguments} of the macros
% described above, and typesets an additional macro as part of the
% syntax of the described macro. For instance, the \cs{csname} macro
% could be described with the sequence
% \cs*{Macro}\cs*{csname}\texttt{<command sequence name>}
% \cs*{AlsoMacro}\cs{endcsname}, which would be rendered as
% \Macro\csname<command sequence name>\AlsoMacro\endcsname\relax.
%
% \subsubsection{Environments}
% In addition to the macros describing macros, \thepkg\ also inherits
% one environment and one macro to describe environments. These are
% similar to the macros described previously in both form and function,
% but lack equivalents for running text.
%
% \DescribeMacro\DescribeEnv[<body content>]{<name>}<arguments>
% This macro describes an environment, in the same way
% \cs{DescribeMacro} does for macros. The \meta{body content}, which
% is optional, may be used to indicate what kind of content the
% environment is designed to contain. The \cs{MacroArgs}
% macro is automatically inserted before \meta{body content}.
%
% \subsubsection{Other entities}
% The document class also provides macros to describe \hologo{BibTeX}
% entries and generic themes. The \hologo{BibTeX} entries are described
% using the \cs{BibEntry} and \cs{WithFields} macros, while themes are
% described using the \cs{Theme} macro.
%
% \DescribeMacro\BibEntry{<entry name>}
% \AlsoMacro\WithFields[<optional fields>]{<mandatory fields>}
% These two macros describe a \hologo{BibTeX} entry named
% \meta{entry name} (\emph{i.e.}, \bib*{\meta{entry name}}) along with
% its optional and mandatory fields.
%
% \DescribeMacro\Theme{<theme name>}
% This macro describes a theme named \meta{theme name}. These could be
% used to describe any kind of theme, such as color themes of a
% document class.
%
% \DescribeMacro\DescribeFile{<filename>}
% This macro describes a special file named \meta{filename}. This
% could be a configuration file or similar that is either part of
% the package or something the package reads if available.
%
% \subsection{Describing the implementation}
% In true \TeX\ (and literal programming) fashion the document class
% also provides ways to describe, in detail, parts of the
% implementation. The most essential of the implementation environments,
% without which \thepkg\ doesn't generate any files, is the
% \env{MacroCode} environment. Other than that, the implementation
% environments should be compatible with or analogous to the standard
% \pkg{ltxdoc} document class.
% 
% \subsubsection{Implementation environments}\label{sec:impl-env}
% The environments described in this section indicate the
% implementation of different concepts including macros, environments
% and options. They each have a starred variant which doesn't print
% the concept name (only indexes it), and a non-starred variant which
% does \Notice{inside these environments, \cs{changes} will refer to
% the relevant entity instead of logging \enquote{general} changes}.
%
% Some of the following environment can typeset descriptions of the 
% internal arguments (\texttt{\#1}, \texttt{\#2} \emph{etc.}) to
% improve readability of the implementation code.
%
% \DescribeEnv[<description>]{macro}{<\textbackslash macro>}
%                     [<\# of args>]{<arg 1 description>}[<default value>]'...'
%                                   {<arg n description>}[<default value>]
% With this environment, the implementation of a macro is described.
% Note that as with \cs{DescribeMacro}, \LaTeX3-style macros can not
% be used in \meta{\textbackslash macro} without the catcode hack
% mentioned earlier.
%
% \DescribeEnv[<description>]{environment}{<environment>}
%                     [<\# of args>]{<arg 1 description>}[<default value>]'...'
%                                   {<arg n description>}[<default value>]
% This environment describes the implementation of an environment.
%
% \DescribeEnv[<description>]{option}{<option>}
% This environment describes the implementation of an option.
%
% \DescribeEnv[<description>]{bibentry}{<@entry>}
% This environment describes the implementation of a \hologo{BibTeX}
% entry type.
%
% \DescribeEnv[<description>]{theme}{<theme>}
% This environment describes the implementation of a theme.
%
% \subsubsection{The \env{MacroCode} environment}
% The \enquote{main event} of the \thepkg\ document class is the
% \env{MacroCode} environment. It has roughly the same role the 
% \env{macrocode} environment has in the \pkg{docstrip} system, except
% that it in addition to typesetting the implementation also saves it
% to the target files.
%
% The workflow is simple; before using \env{MacroCode} to export code
% to a file the file must be declared using \cs{DeclareFile}, which
% also assigns a key to the file (the default is the filename). This
% key is passed to the \env{MacroCode} environment, which saves the
% code to the specified file.
%
% \DescribeMacro\DeclareFile['key='<key>',preamble='<preamble>]{<filename>}
% The \cs{DeclareFile} macro declares a file for future use with
% \env{MacroCode}. The optional argument is a comma separated list of
% key-value options, where the possible keys are \texttt{key} and
% \texttt{preamble}. Here \meta{key} is a key that is used instead
% of the filename in \env{MacroCode}, and \meta{preamble} is a
% token or command sequence expanding to a preamble which will be 
% prepended to the file on output.
%
% \DescribeMacro\PreambleTo{<\textbackslash token>}{<filename>}
% Reads the preamble from \meta{filename}. Lines from the file are
% appended to \meta{\textbackslash token} until a line which does not
% begin with \texttt{\%\%} is encountered.
%
% \DescribeMacro\SelfPreambleTo{<\textbackslash token>}
% This reads the preamble from the curent file. It is equivalent to
% the sequence
% \Macro\PreambleTo{<\textbackslash token>}{\cs*{jobname}.tex}.
%
% \DescribeEnv[<implementation>]{MacroCode}{<key>',...'}
% The \env{MacroCode} environment typesets and exports
% \meta{implementation} verbatim to the file associated with \meta{key}.
% As such, it is the analogue of the \env{macrocode} environment from
% \pkg{ltxdoc}, but does not suffer from some of its drawbacks (the
% sensitivity to whitespace, for instance). As detailed by the
% description of the \opt{highlight} option (on page
% \pageref{ssec:option:highlight}), the environment will highlight
% the code using \pkg{minted} if possible. Multiple \meta{key}s are
% allowed, and the code will be written to all corresponding files.
%
% \subsubsection{Hiding the implementation}
% For lagre packages it may be of interest to hide the implementation
% from the documentation. This is accomplished using the two marker
% macros \cs{Implementation} and \cs{Finale} (which should be present
% even if not hiding the implementation), and the switch macro
% \cs{OnlyDescription}.
%
% \DescribeMacro\Implementation
% This macro indicates the start of the implementation. Normally, this
% would directly precede the \cs{section} under which the implementation
% is organized.
%
% \DescribeMacro\Finale
% This macro indicates the end of the implementation. Usually the only
% things happening after this is the printing of indices, the change
% log, bibliographies and the end of the \env{document} environment.
%
% \DescribeMacro\OnlyDescription
% This macro, which should be issued in the preamble, indicates that the
% implementation should be hidden. \Warning{this has the side effect
% that a page break is inserted where the implementation would normally
% reside.}
%
% \subsection{Documenting changes}
% One type of useful information you should provide in your
% documentation is a list of changes. The \thepkg\ document class
% provides a change list system based on the \pkg{glossaries} package.
% As such, including a change list in your documentation requires you
% to run \texttt{makeglossaries} between the first and second \LaTeX\
% run.
%
% \DescribeMacro\changes{<version>}{<description>}
% The \cs{changes} macro provides the main interface to the change
% list system, and adds changes to the change list. Each change is
% added with a \emph{context}; if the macro is issued inside one of
% the macros described in section~\ref{sec:impl-env}, the concept
% currenly being described will be the context. Outside these
% environment, the context is \enquote{general}. For every context
% and \meta{version}, only one change may be recorded, otherwise
% \pkg{glossaries} will issue a warning.
%
% \DescribeMacro\PrintChanges
% This macro prints the list of changes. As explained earlier, this
% requires you to run \texttt{makeglossaries} between the two \LaTeX\ 
% runs.
%
% \subsection{Producing an index}
% The macros previously discussed in sections~\ref{sec:ref-macros},
% \ref{sec:doc-macros} and \ref{sec:impl-env} automatically index their
% aguments using \pkg{glossaries}. By running \texttt{makeglossaries}
% you can include an index of all macros, environments, packages and 
% such that are discussed, documented or implemented in your package.
%
% \DescribeMacro\PrintIndex
% Much like the \cs{PrintChanges} macro, this prints the index. As with
% the list of changes, this requires that you run 
% \texttt{makeglossaries} between the two \LaTeX\ runs.
%
% \section{Known issues}
% A list of current issues is available in the Github repository of this
% package\footnote{\url{https://github.com/urdh/skdoc/issues}}, but as
% of the release of \theversion, there are no known issues.
% \iffalse
% \begin{description}
%   \item[\#?]  ???
% \end{description}
% \fi
% If you discover any bugs in this package, please report them to the 
% issue tracker in the \thepackage\ Github repository.
%
% \Implementation \ExplHack
% \section{Implementation}
% \iffalse
%</driver>
%<*class>
% \fi
% \subsection{Require packages}
% We begin with loading the \pkg{scrartcl} KOMA-script class and a
% few packages we'll be needing.
%    \begin{macrocode}
\PassOptionsToPackage{log-declarations=false}{xparse}
\LoadClass[ DIV7,
            headings=big,
            numbers=noenddot,
            abstracton,
            bibliography=totocnumbered,
            index=totoc
        ]{scrartcl}
%    \end{macrocode}
% These packages are basic low-level things that we use to declare
% commands, work with strings and so on.
%    \begin{macrocode}
\RequirePackage{etoolbox,xstring,xparse,atbegshi,kvoptions,pdftexcmds,everyhook}
%    \end{macrocode}
% Now, higher-level packages we use in our definitions.
%    \begin{macrocode}
\RequirePackage{verbatim,needspace,marginnote,calc,hyperref,multicol,hologo}
\RequirePackage[nomain,xindy,numberedsection,order=letter,
                sanitizesort=false]{glossaries}
%    \end{macrocode}
% We also include the \pkg{ydoc} packages we'll be extending.
%    \begin{macrocode}
\RequirePackage{ydoc-code,ydoc-desc}
%    \end{macrocode}
% The rest is basically just styling.
%    \begin{macrocode}
\RequirePackage{scrpage2}
\AtEndOfClass{%
    \RequirePackage[\skdoc@babel]{babel}
    \RequirePackage[english=british]{csquotes}
    \RequirePackage[font=small,labelfont=bf,textfont=it]{caption}
    \RequirePackage{PTSerif,sourcecodepro}
    \RequirePackage[defaultsans,osfigures,scale=0.95]{opensans}
    \RequirePackage[babel]{microtype}
}
%    \end{macrocode}
%
% \subsection{Error messages}
% Set up some error message texts for later use.
%    \begin{macrocode}
\msg_new:nnn{skdoc}{key-exists}{File~key~"#1"~already~declared!}
\msg_new:nnn{skdoc}{key-nexists}{File~key~"#1"~hasn't~been~declared!}
\msg_new:nnn{skdoc}{wrote-file}{Writing~things~to~file~"#1".}
\msg_new:nnn{skdoc}{read-preamble}{Reading~preamble~from~file~"#1".}
\msg_new:nnn{skdoc}{no-lppl}{Could~not~include~LPPL:~lppl.tex~does~not~exist!}
\msg_new:nnn{skdoc}{no-minted}{Syntax~highlighting~disabled:~couldn't~find~minted.sty!}
\msg_new:nnn{skdoc}{no-shell-escape}{Syntax~highlighting~disabled:~running~without~unrestricted~\string\write18.}
\msg_new:nnn{skdoc}{no-pygments}{Syntax~highlighting~disabled:~couldn't~find~"pygmentize".}
\msg_new:nnnn{skdoc}{bibtex-unsupported}{The `bibtex` package is unsupported: continue at own risk!}{Use a more modern bibliography system (i.e. `biblatex`) instead.}
%    \end{macrocode}
%
% \subsection{Booleans}
% Set up some booleans used throughout the code.
% \begin{macro}{\g__skdoc_use_minted_bool}
% The \texttt{use_minted} boolean keeps track of wether we're using
% \pkg{minted} or not. The default value is \emph{false}.
%    \begin{macrocode}
\bool_new:N\g__skdoc_use_minted_bool
\bool_gset_false:N\g__skdoc_use_minted_bool
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\g__skdoc_no_index_bool}
% The \texttt{no_index} boolean keeps track of wether the indexing
% macros should write things to the index or not. The default value is
% \emph{false} (don't not write things to the index).
%    \begin{macrocode}
\bool_new:N\g__skdoc_no_index_bool
\bool_gset_false:N\g__skdoc_no_index_bool
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\g__skdoc_in_example_bool}
% The \texttt{in_example} boolean keeps track of wether we are currently
% inside an example or not (used mainly by \cs{skdoc@verbatim}). The
% default value is of course \emph{false}.
%    \begin{macrocode}
\bool_new:N\g__skdoc_in_example_bool
\bool_gset_false:N\g__skdoc_in_example_bool
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\g__skdoc_with_implementation_bool}
% The \texttt{with_implementation} boolean keeps track of wether we are
% going to typeset the implementation or not. The default value is
% \emph{true}, and this is only changed by \cs{OnlyDescription}.
%    \begin{macrocode}
\bool_new:N\g__skdoc_with_implementation_bool
\bool_gset_true:N\g__skdoc_with_implementation_bool
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\g__skdoc_in_implementation_bool}
% The \texttt{in_implementation} boolean keeps track of wether we are
% in the implementation part of the documentation or not. It defaults
% to \emph{false}, and is changed by \cs{Implementation} and \cs{Finale}.
%    \begin{macrocode}
\bool_new:N\g__skdoc_in_implementation_bool
\bool_gset_false:N\g__skdoc_in_implementation_bool
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\g__skdoc_negative_space_bool}
% This boolean keeps track of the negative spacing added by description
% environments, allowing \env{MacroCode} to offset it if it follows the
% start of these environments directly. Bit of a hack, really.
%    \begin{macrocode}
\bool_new:N\g__skdoc_negative_space_bool
\bool_gset_false:N\g__skdoc_negative_space_bool
%    \end{macrocode}
% \end{macro}
%
% Finally, we define a helpful conditional based on the last two
% booleans. It decides wether code in \cs{skdoc@verbatim} is typeset
% or just output to a file.
% \begin{macro*}{\__skdoc_if_print_code_p:}
% \begin{macro*}{\__skdoc_if_print_code:T}
% \begin{macro*}{\__skdoc_if_print_code:F}
% \begin{macro}{\__skdoc_if_print_code:TF}
%    \begin{macrocode}
\prg_new_conditional:Nnn\__skdoc_if_print_code:{p,T,F,TF}{
    \bool_if:nTF{
        \g__skdoc_in_implementation_bool &&
        !\g__skdoc_with_implementation_bool
    }{
        \prg_return_false:
    }{
        \prg_return_true:
    }
}
%    \end{macrocode}
% \end{macro}
% \end{macro*}
% \end{macro*}
% \end{macro*}
%
% \subsection{Options}
% Define the all options, and process them.
%    \begin{macrocode}
\SetupKeyvalOptions{
    family=skdoc,
    prefix=skdoc@
}
\DeclareStringOption{load}[\jobname]
\DeclareStringOption[british]{babel}
\DeclareBoolOption[true]{highlight}
\ProcessKeyvalOptions*
%    \end{macrocode}
% If the \opt{load} option was used, load the given package if it exists.
%    \begin{macrocode}
\IfStrEq{\skdoc@load}{}{}{%
    \IfFileExists{\skdoc@load.sty}{%
        \RequirePackage{\skdoc@load}
    }{}
}
%    \end{macrocode}
%
% \subsection{Special case: syntax highlighting}
% We support syntax highlighting through \pkg{minted}, but only if 
% we're running with unrestricted \cs{write18} access \emph{and}
% there exists a suitable executable (\texttt{pygmentize}). Since
% \pkg{minted} bails out without \cs{write18} access, we have to test
% that before even loading it.
%
% \subsubsection{A simple \cs{write18} test}
% Using the \cs{pdf@shellescape} macro from \pkg{pdftexcmds}, we
% can define a new conditional that decides if we have unrestricted
% \cs{write18} or not.
% \begin{macro*}{\__skdoc_if_shellescape:T}
% \begin{macro*}{\__skdoc_if_shellescape:F}
% \begin{macro}{\__skdoc_if_shellescape:TF}
%    \begin{macrocode}
\prg_new_conditional:Nnn\__skdoc_if_shellescape:{T,F,TF}{
    \if_cs_exist:N\pdf@shellescape
%    \end{macrocode}
% If the command sequence exists (it really should), we test to see
% if it is equal to one. The \cs{pdf@shellescape} macro will be zero
% if no \cs{write18} access is available, two if we have restricted
% access and one if access is unrestricted.
%    \begin{macrocode}
        \if_int_compare:w\pdf@shellescape=\c_one
            \prg_return_true:
        \else:
            \prg_return_false:
        \fi:
%    \end{macrocode}
% If the command sequence doesn't exist, we assume that we have
% unrestricted \cs{write18} access (we probably don't), and let
% \LaTeX\ complain about it later.
%    \begin{macrocode}
    \else:
        \prg_return_true:
    \fi:
}
%    \end{macrocode}
% \end{macro}
% \end{macro*}
% \end{macro*}
%
% \subsubsection{Testing for an application}
% In order to find out wether \texttt{pygmentize} is installed, we
% have to test for its binary. This is done by shelling out to
% \texttt{which} and reading a temporary file, which means we need
% a way to delete that file.
% \begin{macro}{\__skdoc_rm:n}[1]
%   {The file to be removed}
%    \begin{macrocode}
\cs_new:Npn\__skdoc_rm:n#1{
    \immediate\write18{rm~#1}
}
%    \end{macrocode}
% \end{macro}
% Now, let's define the actual test. Note that this test will fail
% on non-unixy platforms (\emph{i.e.} Windows). Deal with it for now.
% \begin{macro*}{\__skdoc_if_pygmentize:nT}
% \begin{macro*}{\__skdoc_if_pygmentize:nF}
% \begin{macro}{\__skdoc_if_pygmentize:nTF}[1]
%   {The name of the binary to check existence of}
%    \begin{macrocode}
\prg_new_conditional:Nnn\__skdoc_if_pygmentize:{T,F,TF}{
%    \end{macrocode}
% First, run \texttt{which} to create the temporary file.
%    \begin{macrocode}
    \immediate\write18{which~pygmentize~&&~touch~\jobname.aex}
%    \end{macrocode}
% A temporary boolean is defined to hold the result of the test (this
% is a bit of carco cult programming, any clues as to why placing the
% result inside \cs{file_if_exists:nTF} doesn't work are welcome), and
% if the test is successful we remove the temporary file.
%    \begin{macrocode}
    \bool_set:Nn\l_tmpa_bool{\c_false_bool}
    \file_if_exist:nT{\jobname.aex}{
        \__skdoc_rm:n{\jobname.aex}
        \bool_set:Nn\l_tmpa_bool{\c_true_bool}
    }
%    \end{macrocode}
% Finally, the temporary boolean is used to return a result.
%    \begin{macrocode}
    \if_bool:N\l_tmpa_bool
        \prg_return_true:
    \else:
        \prg_return_false:
    \fi:
}
%    \end{macrocode}
% \end{macro}
% \end{macro*}
% \end{macro*}
%
% Using the macros defined above, we can test for both \cs{write18}
% and \texttt{pygmentize}, loading \pkg{minted} and setting a flag
% if both exist. If the option \opt{highlight} was supplied and set
% to \texttt{false}, we do nothing.
%    \begin{macrocode}
\ifskdoc@highlight
    \IfFileExists{\skdoc@load.sty}{
        \__skdoc_if_shellescape:TF{
            \__skdoc_if_pygmentize:TF{
                \bool_gset_true:N\g__skdoc_use_minted_bool
                \RequirePackage{minted}
%    \end{macrocode}
% Now that we have \pkg{minted}, we redefine the style of the line
% numbers to match what we have further down for the non-highlighted
% mode.
%    \begin{macrocode}
                \renewcommand{\theFancyVerbLine}{
                    \sffamily\tiny\textcolor{lightgray}{
                    \oldstylenums{\arabic{FancyVerbLine}}}
                }
%    \end{macrocode}
% We also define our own Pygments style, to match the \thepackage%
% color theme. This is a bunch of code generated by running
% \texttt{pygmentize -S default -f latex}, with modifications. Note
% the abundancy of \verb|#| characters; this is somewhat black magic,
% but apparently \LaTeX\ expands them one more time than I'd expect
% in this context. Probably a \LaTeX3 artifact. Also, the macro names
% somehow correspond to Pygments entities (see \emph{e.g.}
% \texttt{pygmentize -S default -f html}), but it's not entirely
% apparent which macro corresponds to what entity.
%    \begin{macrocode}
                \renewcommand\minted@usedefaultstyle{}
                \def\PY@reset{\let\PY@it=\relax \let\PY@bf=\relax%
                    \let\PY@ul=\relax \let\PY@tc=\relax%
                    \let\PY@bc=\relax \let\PY@ff=\relax}
                \def\PY@tok##1{\csname PY@tok@##1\endcsname}
                \def\PY@toks##1+{\ifx\relax##1\empty\else%
                    \PY@tok{##1}\expandafter\PY@toks\fi}
                \def\PY@do##1{\PY@bc{\PY@tc{\PY@ul{%
                    \PY@it{\PY@bf{\PY@ff{##1}}}}}}}
                \def\PY##1##2{\PY@reset\PY@toks##1+\relax+\PY@do{##2}}
                \expandafter\def\csname PY@tok@gd\endcsname{%
                    \def\PY@tc####1{\textcolor{scriptcolor}{####1}}}
                \expandafter\def\csname PY@tok@gu\endcsname{%
                    \let\PY@bf=\textbf%
                    \def\PY@tc####1{\textcolor{optioncolor}{####1}}}
                \expandafter\def\csname PY@tok@gt\endcsname{%
                    \def\PY@tc####1{\textcolor{scriptcolor}{####1}}}
                \expandafter\def\csname PY@tok@gs\endcsname{%
                    \let\PY@bf=\textbf}
                \expandafter\def\csname PY@tok@gr\endcsname{%
                    \def\PY@tc####1{\textcolor{scriptcolor}{####1}}}
                \expandafter\def\csname PY@tok@cm\endcsname{%
                    \let\PY@it=\textit%
                    \def\PY@tc####1{\textcolor{lightgray}{####1}}}
                \expandafter\def\csname PY@tok@vg\endcsname{%
                    \def\PY@tc####1{\textcolor{scriptcolor}{####1}}}
                \expandafter\def\csname PY@tok@m\endcsname{%
                    \def\PY@tc####1{\textcolor{meta}{####1}}}
                \expandafter\def\csname PY@tok@mh\endcsname{%
                    \def\PY@tc####1{\textcolor{meta}{####1}}}
                \expandafter\def\csname PY@tok@cs\endcsname{%
                    \let\PY@it=\textit%
                    \def\PY@tc####1{\textcolor{macroimpl}{####1}}}
                \expandafter\def\csname PY@tok@ge\endcsname{%
                    \let\PY@it=\textit}
                \expandafter\def\csname PY@tok@vc\endcsname{%
                    \def\PY@tc####1{\textcolor{scriptcolor}{####1}}}
                \expandafter\def\csname PY@tok@il\endcsname{%
                    \def\PY@tc####1{\textcolor{meta}{####1}}}
                \expandafter\def\csname PY@tok@go\endcsname{%
                    \def\PY@tc####1{\textcolor{gray}{####1}}}
                \expandafter\def\csname PY@tok@cp\endcsname{%
                    \def\PY@tc####1{\textcolor{sharp!75}{####1}}}
                \expandafter\def\csname PY@tok@gi\endcsname{%
                    \def\PY@tc####1{\textcolor{bright}{####1}}}
                \expandafter\def\csname PY@tok@gh\endcsname{%
                    \let\PY@bf=\textbf%
                    \def\PY@tc####1{\textcolor{section}{####1}}}
                \expandafter\def\csname PY@tok@ni\endcsname{%
                    \let\PY@bf=\textbf%
                    \def\PY@tc####1{\textcolor{keydesc}{####1}}}
                \expandafter\def\csname PY@tok@nn\endcsname{%
                    \let\PY@ul=\underline%
                    \def\PY@tc####1{\textcolor{black}{####1}}}
                \expandafter\def\csname PY@tok@no\endcsname{%
                    \def\PY@tc####1{\textcolor{scriptcolor}{####1}}}
                \expandafter\def\csname PY@tok@na\endcsname{%
                    \def\PY@tc####1{\textcolor{meta!50}{####1}}}
                \expandafter\def\csname PY@tok@nb\endcsname{%
                    \def\PY@tc####1{\textcolor{black}{####1}}}
                \expandafter\def\csname PY@tok@nc\endcsname{%
                    \let\PY@ul=\underline%
                    \def\PY@tc####1{\textcolor{bright}{####1}}}
                \expandafter\def\csname PY@tok@nd\endcsname{%
                    \def\PY@tc####1{\textcolor{gray}{####1}}}
                \expandafter\def\csname PY@tok@si\endcsname{%
                    \def\PY@tc####1{\textcolor{sharp}{####1}}}
                \expandafter\def\csname PY@tok@nf\endcsname{%
                    \def\PY@tc####1{\textcolor{bright}{####1}}}
                \expandafter\def\csname PY@tok@s2\endcsname{%
                    \def\PY@tc####1{\textcolor{sharp}{####1}}}
                \expandafter\def\csname PY@tok@vi\endcsname{%
                    \def\PY@tc####1{\textcolor{scriptcolor}{####1}}}
                \expandafter\def\csname PY@tok@nt\endcsname{%
                    \let\PY@bf=\textbf%
                    \def\PY@tc####1{\textcolor{meta!50}{####1}}}
                \expandafter\def\csname PY@tok@nv\endcsname{%
                    \def\PY@tc####1{\textcolor{scriptcolor}{####1}}}
                \expandafter\def\csname PY@tok@s1\endcsname{%
                    \def\PY@tc####1{\textcolor{sharp}{####1}}}
                \expandafter\def\csname PY@tok@gp\endcsname{%
                    \def\PY@tc####1{\textcolor{gray}{####1}}}
                \expandafter\def\csname PY@tok@sh\endcsname{%
                    \def\PY@tc####1{\textcolor{sharp}{####1}}}
                \expandafter\def\csname PY@tok@ow\endcsname{%
                    \def\PY@tc####1{\textcolor{macroimpl}{####1}}}
                \expandafter\def\csname PY@tok@sx\endcsname{%
                    \def\PY@tc####1{\textcolor{sharp}{####1}}}
                \expandafter\def\csname PY@tok@bp\endcsname{%
                    \def\PY@tc####1{\textcolor{black}{####1}}}
                \expandafter\def\csname PY@tok@c1\endcsname{%
                    \let\PY@it=\textit%
                    \def\PY@tc####1{\textcolor{lightgray}{####1}}}
                \expandafter\def\csname PY@tok@kc\endcsname{%
                    \def\PY@tc####1{\textcolor{macroimpl}{####1}}}
                \expandafter\def\csname PY@tok@c\endcsname{%
                    \let\PY@it=\textit%
                    \def\PY@tc####1{\textcolor{lightgray}{####1}}}
                \expandafter\def\csname PY@tok@mf\endcsname{%
                    \def\PY@tc####1{\textcolor{meta}{####1}}}
                \expandafter\def\csname PY@tok@err\endcsname{%
                    \def\PY@tc####1{\textcolor{intlink}{####1}}%
                    \def\PY@bc####1{\setlength{\fboxsep}{0pt}%
                    \colorbox{bright}{\strut ####1}}}
                \expandafter\def\csname PY@tok@kd\endcsname{%
                    \def\PY@tc####1{\textcolor{macroimpl}{####1}}}
                \expandafter\def\csname PY@tok@ss\endcsname{%
                    \def\PY@tc####1{\textcolor{macroimpl}{####1}}}
                \expandafter\def\csname PY@tok@sr\endcsname{%
                    \def\PY@tc####1{\textcolor{meta}{####1}}}
                \expandafter\def\csname PY@tok@mo\endcsname{%
                    \def\PY@tc####1{\textcolor{meta}{####1}}}
                \expandafter\def\csname PY@tok@mi\endcsname{%
                    \def\PY@tc####1{\textcolor{meta}{####1}}}
                \expandafter\def\csname PY@tok@kn\endcsname{%
                    \def\PY@tc####1{\textcolor{macroimpl}{####1}}}
                \expandafter\def\csname PY@tok@kr\endcsname{%
                    \def\PY@tc####1{\textcolor{macroimpl}{####1}}}
                \expandafter\def\csname PY@tok@s\endcsname{%
                    \def\PY@tc####1{\textcolor{sharp}{####1}}}
                \expandafter\def\csname PY@tok@kp\endcsname{%
                    \def\PY@tc####1{\textcolor{macroimpl}{####1}}}
                \expandafter\def\csname PY@tok@w\endcsname{%
                    \def\PY@tc####1{\textcolor{lightgray}{####1}}}
                \expandafter\def\csname PY@tok@kt\endcsname{%
                    \def\PY@tc####1{\textcolor{black}{####1}}}
                \expandafter\def\csname PY@tok@sc\endcsname{%
                    \def\PY@tc####1{\textcolor{sharp}{####1}}}
                \expandafter\def\csname PY@tok@sb\endcsname{%
                    \def\PY@tc####1{\textcolor{sharp}{####1}}}
                \expandafter\def\csname PY@tok@k\endcsname{%
                    \def\PY@tc####1{\textcolor{macroimpl}{####1}}}
                \expandafter\def\csname PY@tok@se\endcsname{%
                    \def\PY@tc####1{\textcolor{sharp}{####1}}}
                \expandafter\def\csname PY@tok@sd\endcsname{%
                    \def\PY@tc####1{\textcolor{sharp}{####1}}}
                \expandafter\def\csname PY@tok@nl\endcsname{%
                    \def\PY@tc####1{\textcolor{bright}{####1}}}
                \expandafter\def\csname PY@tok@ne\endcsname{%
                    \def\PY@tc####1{\textcolor{bright}{####1}}}
                \expandafter\def\csname PY@tok@o\endcsname{%
                    \def\PY@tc####1{\textcolor{macroimpl}{####1}}}
                \def\PYZbs{\char`\\}
                \def\PYZus{\char`\_}
                \def\PYZob{\char`\{}
                \def\PYZcb{\char`\}}
                \def\PYZca{\char`\^}
                \def\PYZam{\char`\&}
                \def\PYZlt{\char`\<}
                \def\PYZgt{\char`\>}
                \def\PYZsh{\char`\#}
                \def\PYZpc{\char`\%}
                \def\PYZdl{\char`\$}
                \def\PYZhy{\char`\-}
                \def\PYZsq{\char`\'}
                \def\PYZdq{\char`\"}
                \def\PYZti{\char`\~}
                \def\PYZat{@}
                \def\PYZlb{[}
                \def\PYZrb{]}
%    \end{macrocode}
% If there's no \texttt{pygmentize}, no \cs{write18} or no \pkg{minted},
% we display a warning message and proceed without highlighting.
%    \begin{macrocode}
            }{
                \msg_warning:nn{skdoc}{no-pygments}
            }
        }{
            \msg_warning:nn{skdoc}{no-shell-escape}
        }
    }{
        \msg_warning:nn{skdoc}{no-minted}
    }
\fi
%    \end{macrocode}
% \subsection{The \env{MacroCode} environment}
% We need a token list and input/output.
%    \begin{macrocode}
\tl_new:N\skdoc@temptl
\ior_new:N\skdoc@input
\iow_new:N\skdoc@output
%    \end{macrocode}
% \begin{macro}{\DeclareFile}[2]
%   {A list of key-value parameters}
%   {Filename of the file being declared}
% This declares a file as part of the bundle, which means we will be
% writing things to it.
%    \changes{1.1a}{Don't create a new token list until we know the
%                   key isn't a duplicate}
%    \begin{macrocode}
\DeclareDocumentCommand\DeclareFile{om}{
    \group_begin:
    \keys_define:nn{skdoc@declarefile}{%
        preamble .value_required:,
        preamble .code:n = \edef\skdoc@preamble{##1},
        key .value_required:,
        key .code:n = \def\skdoc@key{##1}
    }%
    \def\skdoc@preamble{}%
    \def\skdoc@key{#2}%
    \IfNoValueTF{#1}{}{\keys_set:nn{skdoc@declarefile}{#1}}
    \int_if_exist:cTF{skdoc@output@\skdoc@key @line}{
        \msg_critical:nnx{skdoc}{key-exists}{\skdoc@key}
    }{
        \int_zero_new:c{skdoc@output@\skdoc@key @line}
    }
    \tl_new:c{skdoc@output@\skdoc@key}
    \IfStrEq{\skdoc@preamble}{}{
        \def\skdoc@preamble@extra{}
    }{
        \tl_set:Nx\l_tmpa_tl{\skdoc@preamble}
        \edef\skdoc@temp{\tl_head:N\l_tmpa_tl}
        \def\skdoc@preamble@extra{
            \skdoc@temp\skdoc@temp\space~This~is~file~`#2',~generated~from~`\c_job_name_tl.tex'~(key~`\skdoc@key').
        }
    }
    \expandafter\xdef\csname skdoc@write@#2\endcsname{%
        \noexpand\msg_log:nnn{skdoc}{wrote-file}{#2}
        \noexpand\iow_open:Nn\noexpand\skdoc@output{#2}
        \noexpand\IfStrEq{\skdoc@preamble}{}{}{
            \noexpand\iow_now:Nx\noexpand\skdoc@output{\skdoc@preamble@extra}
            \noexpand\iow_now:Nx\noexpand\skdoc@output{\skdoc@preamble}
        }
        \noexpand\iow_now:Nx\noexpand\skdoc@output{\noexpand\tl_to_str:c{skdoc@output@\skdoc@key}}
        \noexpand\iow_close:N\noexpand\skdoc@output
    }
    \AfterEndDocument{\csname skdoc@write@#2\endcsname}
    \group_end:
}
%    \end{macrocode}
% \end{macro}
% \begin{environment}{skdoc@verbatim}[1]
%   {The key of the file being described}
% \changes{1.1}{Introducing syntax highlighting}
% \changes{1.1a}{Test for key existence before bumping counter,
%                use \cs{Needspace*} to prevent code label from
%                staying on the wrong page in some situations}
% \changes{1.2}{Hide line numbers when inside \env{example}}
% \changes{1.3}{Allow multiple (comma-separated) targets}
% \changes{1.3a}{Fix critical bug}
% This environment does all the actual work for \env{MacroCode}.
%    \begin{macrocode}
\clist_new:N\l__skdoc_keys
\DeclareDocumentEnvironment{skdoc@verbatim}{m}{%
    \clist_set:Nn\l__skdoc_keys{#1}
%    \end{macrocode}
% If the file we're supposed to write to hasn't been initialized yet,
% we error out with a critical error.
%    \begin{macrocode}
    \clist_map_inline:Nn\l__skdoc_keys{
        \int_if_exist:cTF{skdoc@output@##1@line}{}{
            \msg_critical:nnn{skdoc}{key-nexists}{##1}
        }%
%    \end{macrocode}
% Before doing anything, set create or increment a counter keeping
% track of the line number of the file we're writing to.
%    \begin{macrocode}
        \int_compare:nNnT{\int_use:c{skdoc@output@##1@line}}=\c_zero%
            {\int_gincr:c{skdoc@output@##1@line}}%
    }
%    \end{macrocode}
% Now, if we're supposed to print code, we set a few things up.
%    \begin{macrocode}
    \__skdoc_if_print_code:T{
        \bool_if:NTF\g__skdoc_use_minted_bool{
%    \end{macrocode}
% If we're using \pkg{minted}, we set a few options ans open the
% output file.
%    \begin{macrocode}
            \minted@resetoptions%
            \exp_args:Nnx\setkeys{minted@opt}{
                \int_compare:nNnF{\clist_count:N\l__skdoc_keys}>\c_one{
                    \bool_if:NF\g__skdoc_in_example_bool{linenos,}
                    firstnumber=\int_use:c{skdoc@output@#1@line}
                }
            }%
            \iow_open:Nn\minted@code{\jobname.pyg}%
            \Needspace*{2\baselineskip}%
        }{
%    \end{macrocode}
% Otherwise, we hack spaces with \cs{@bsphack} (unless we're in an
% \env{example} environment).
%    \begin{macrocode}
            \bool_if:NF\g__skdoc_in_example_bool{\@bsphack}%
        }
        \bool_if:NF\g__skdoc_in_example_bool{
%    \end{macrocode}
% In all non-example code, \pkg{minted} or not, we output a small
% marker showing what file we are writing to.
%    \begin{macrocode}
            \marginnote{
                \leavevmode
                \llap{
                    \scriptsize\color{gray}
                    $\langle$#1$\rangle$
                    \makebox[2ex]{\strut}
                }
            }
        }
    }
%    \end{macrocode}
% Otherwise, we set up the \env{verbatim} line processor.
%    \begin{macrocode}
    \def\verbatim@processline{%
%    \end{macrocode}
% We alsays append the line to the appropriate token list, so that it
% is saved to the output file.
%    \begin{macrocode}
        \clist_map_inline:Nn\l__skdoc_keys{
            \tl_gput_right:cx{skdoc@output@####1}{\the\verbatim@line\iow_newline:}%
        }
%    \end{macrocode}
% If we're supposed to print code, we do a lot more...
%    \begin{macrocode}
        \__skdoc_if_print_code:T{
            \bool_if:NTF\g__skdoc_use_minted_bool{
%    \end{macrocode}
% ...but if we're using minted, \enquote{a lot more} consists of also
% writing the line to the file used by \pkg{minted}.
%    \begin{macrocode}
                \iow_now:Nx\minted@code{\the\verbatim@line}%
            }{
%    \end{macrocode}
% Otherwise, we actually do a lot of stuff. We typeset the line number
% (unless we're in an example):
%    \begin{macrocode}
                \noindent\leavevmode%
                \bool_if:NF\g__skdoc_in_example_bool{\hspace*{-5ex}}
                \begin{minipage}[c][1ex]{\textwidth}
                    \bool_if:nF{
                        \g__skdoc_in_example_bool &&
                        !\int_compare_p:nNn{\clist_count:N\l__skdoc_keys}>\c_one
                    }{
                        \makebox[4ex]{%
                            \leavevmode
                            \sffamily\tiny\color{lightgray}\hfill%
                            \clist_map_inline:Nn\l__skdoc_keys{
                                \oldstylenums{\int_use:c{skdoc@output@####1@line}}%
                            }
                        }%
                        \hspace*{1ex}%
                    }
%    \end{macrocode}
% We also typeset the actual line:
%    \begin{macrocode}
                    {
                        \verbatim@font
                        \the\verbatim@line
                    }
                \end{minipage}
%    \end{macrocode}
% Both of them in the same one-line-high minipage covering the page
% width. Note the use of \cs{llap} for line numbers in the margin.
% We end with a \cs{par} for the next line.
%    \begin{macrocode}
                \par
            }
        }
%    \end{macrocode}
% Finally, the line number counter is incremented.
%    \begin{macrocode}
        \clist_map_inline:Nn\l__skdoc_keys{
            \int_gincr:c{skdoc@output@####1@line}%
        }
    }%
%    \end{macrocode}
% Now the \env{verbatim} catcode magic begins.
%    \begin{macrocode}
    \group_begin:
    \let\do\@makeother\dospecials\catcode`\^^M\active%
    \bool_if:nT{
        \__skdoc_if_print_code_p: &&
        !\g__skdoc_use_minted_bool
    }{
        \frenchspacing\@vobeyspaces
    }
    \verbatim@start%
}{%
    \group_end:
%    \end{macrocode}
% The catcode magic is over! Now, if we're printing code, there are
% a few things left to do.
%    \begin{macrocode}
    \__skdoc_if_print_code:T{
        \bool_if:NTF\g__skdoc_use_minted_bool{
%    \end{macrocode}
% If we're using \pkg{minted}, we still have to actually print the code.
% We begin with closing the output file.
%    \begin{macrocode}
            \iow_close:N\minted@code%
%    \end{macrocode}
% A few spacing fixes are applied. Since \pkg{minted} uses
% \pkg{fancyvrb}, these negative \cs{vspace}s are derived from the
% \pkg{fancyvrb} documentation \parencite[pp.~46--47]{Rahtz10}. What
% we want to do is to offset the spacing produced by \pkg{minted}, so
% that we are in control.
%    \begin{macrocode}
            \bool_if:NF\g__skdoc_in_example_bool{
                \vspace*{-\topsep}
                \vspace*{-\partopsep}
                \vspace*{-\parskip}
            }
%    \end{macrocode}
% Now, the internal \pkg{minted} macro \cs{minted@pygmentize} is called
% to highlight and typeset the code, and the temporary file is removed.
%    \begin{macrocode}
            \minted@pygmentize{latex}%
            \DeleteFile{\jobname.pyg}%
%    \end{macrocode}
% This is followed by more space-offsetting.
%    \begin{macrocode}
            \vspace*{-\topsep}
            \vspace*{-\partopsep}
        }{
%    \end{macrocode}
% If we aren't using \pkg{minted}, we hack spaces with \cs{@esphack}
% instead.
%    \begin{macrocode}
            \bool_if:NF\g__skdoc_in_example_bool{\@esphack}%
        }
    }%
}
%    \end{macrocode}
% \end{environment}
% \begin{environment}{MacroCode}[1]
%   {The key of the file being described}
% \changes{1.1}{Minor changes due to syntax highlighting}
% \changes{1.3b}{Offset negative spacing from the description environments}
%    \begin{macrocode}
\DeclareDocumentEnvironment{MacroCode}{m}{
    \__skdoc_if_print_code:T{
        \bool_if:NT\g__skdoc_negative_space_bool{\vspace{\baselineskip}}
        \vspace{.2\baselineskip}
        \bool_if:NF\g__skdoc_use_minted_bool{\par\noindent}
    }
    \skdoc@verbatim{#1}
}{
    \endskdoc@verbatim
    \__skdoc_if_print_code:T{
        \vspace{.5\baselineskip}
    }
}
%    \end{macrocode}
% \end{environment}
%
% \subsubsection{Reading a preamble}
% \begin{macro}{\PreambleTo}[2]
%   {A token to which we will save the preamble}
%   {File to read the preamble from}
% Read preamble from a document and store in variable.
%    \begin{macrocode}
\DeclareDocumentCommand\PreambleTo{mm}{%
    \group_begin:
    \msg_info:nnn{skdoc}{read-preamble}{#2}
    \ior_open:Nn\skdoc@input{#2}
    \bool_until_do:nn{\ior_if_eof_p:N\skdoc@input}{%
        \tl_if_empty:NTF\skdoc@temptl{}{%
            \tl_put_right:Nx\skdoc@temptl{\iow_newline:}
        }
        \tl_clear:N\l_tmpb_tl
        \ior_get_str:NN\skdoc@input\l_tmpa_tl
        \tl_put_right:Nx\l_tmpb_tl{\tl_head:N\l_tmpa_tl}
        \IfStrEq{\tl_to_str:N\l_tmpb_tl}{\@percentchar}{%
            \tl_set_eq:NN\l_tmpb_tl\skdoc@temptl
            \tl_concat:NNN\skdoc@temptl\l_tmpb_tl\l_tmpa_tl
        }{%
            \ior_close:N\skdoc@input
        }
    }
    \xdef#1{\tl_to_str:N\skdoc@temptl}
    \group_end:
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\SelfPreambleTo}[1]
%   {A token to which we will save the preamble}
% Shorthand to read preamble from current document.
%    \begin{macrocode}
\DeclareDocumentCommand\SelfPreambleTo{m}{%
    \PreambleTo{#1}{\c_job_name_tl}%
}
%    \end{macrocode}
% \end{macro}
%
% \subsection{Styling}
% \subsubsection{Colors}
% First, we redefine a couple of colors from \pkg{ydoc} as well as
% defining a couple for ourselves.
%    \begin{macrocode}
\definecolorset{RGB}{}{}{
    section,11,72,107;
    extlink,73,10,61;
    intlink,140,35,24;
    sharp,250,105,0;
    bright,198,229,217;
    macrodesc,73,10,61;
    keydesc,140,35,24;
    macroimpl,73,10,61;
    meta,11,72,107;
    scriptcolor,140,35,24;
    optioncolor,73,10,61;
    opt,73,10,61
}
%    \end{macrocode}
% \subsubsection{Fonts}
% Then we redefine a couple of the KOMA-script font commands to use
% our newly defined colors, along with other fixes.
%    \begin{macrocode}
\RenewDocumentCommand\descfont{}{\sffamily\fontseries{sb}}
\RenewDocumentCommand\sectfont{}{\sffamily\fontseries{sb}}
\addtokomafont{minisec}{\bfseries}
\addtokomafont{paragraph}{\color{section}}
\addtokomafont{section}{\color{section}}
\addtokomafont{subsection}{\color{section}}
\addtokomafont{subsubsection}{\color{section}}
\addtokomafont{descriptionlabel}{\color{section}}
\addtokomafont{sectionentry}{\rmfamily\bfseries}
\addtokomafont{sectionentrypagenumber}{\rmfamily\bfseries}
%    \end{macrocode}
% \subsubsection{Configuring \pkg{hyperref}}
% Finally, we set up \pkg{hyperref} to also use our colors.
%    \begin{macrocode}
\hypersetup{
    colorlinks=true,
    linkcolor=intlink,
    anchorcolor=intlink,
    citecolor=black,
    urlcolor=extlink
}
%    \end{macrocode}
%
% \subsection{Documentation macros}
% We can now start defining the documentation macros.
%
% \subsubsection{Inline referencing}
% We introduce a couple of macros for referencing various constructs
% in running text, \emph{i.e.} \cs{cs}-like macros. The starred
% variants will not index the use, the non-starred variants will.
% \begin{macro}{\cs}[2]
%   {True if this is the starred variant}
%   {The macro name to be typeset}
% The \cs{cs} macro typesets a macro.
%    \begin{macrocode}
\DeclareDocumentCommand\cs{sm}{
    \texttt{\char`\\#2}
    \bool_if:NF\g__skdoc_no_index_bool{
        \IfBooleanTF{#1}{}{\index@macro{#2}}
    }
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\env}[2]
%   {True if this is the starred variant}
%   {The environment name to be typeset}
% The \cs{env} macro typesets an environment.
%    \begin{macrocode}
\DeclareDocumentCommand\env{sm}{
    \texttt{#2}
    \bool_if:NF\g__skdoc_no_index_bool{
        \IfBooleanTF{#1}{}{\index@environment{#2}}
    }
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\pkg}[2]
%   {True if this is the starred variant}
%   {The package name to be typeset}
% The \cs{pkg} macro typesets a package.
%    \begin{macrocode}
\DeclareDocumentCommand\pkg{sm}{
    \textsf{#2}
    \bool_if:NF\g__skdoc_no_index_bool{
        \IfBooleanTF{#1}{}{\index@package{#2}}
    }
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\opt}[2]
%   {True if this is the starred variant}
%   {The option name to be typeset}
% The \cs{opt} macro typesets an option
%    \begin{macrocode}
\DeclareDocumentCommand\opt{sm}{
    \texttt{#2}
    \bool_if:NF\g__skdoc_no_index_bool{
        \IfBooleanTF{#1}{}{\index@option{#2}}
    }
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\bib}[2]
%   {True if this is the starred variant}
%   {The \hologo{BibTeX} entry type name to be typeset}
% The \cs{bib} macro typesets a \hologo{BibTeX} entry type.
%    \begin{macrocode}
\DeclareDocumentCommand\bib{sm}{
    \texttt{@#2}
    \bool_if:NF\g__skdoc_no_index_bool{
        \IfBooleanTF{#1}{}{\index@bibentry{#2}}
    }
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\thm}[2]
%   {True if this is the starred variant}
%   {The theme name to be typeset}
% The \cs{thm} macro typesets a theme of some sort.
%    \begin{macrocode}
\DeclareDocumentCommand\thm{sm}{
    \textrm{#2}
    \bool_if:NF\g__skdoc_no_index_bool{
        \IfBooleanTF{#1}{}{\index@theme{#2}}
    }
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\file}[2]
%   {True if this is the starred variant}
%   {The file name to be typeset}
% The \cs{file} macro typesets a file name.
%    \begin{macrocode}
\DeclareDocumentCommand\file{sm}{
    \texttt{#2}
    \bool_if:NF\g__skdoc_no_index_bool{
        \IfBooleanTF{#1}{}{\index@file{#2}}
    }
}
%    \end{macrocode}
% \end{macro}
%
% \subsubsection{Descriptional macros}
% A range of descriptional macros are made available by the \pkg{ydoc}
% package, but we need to redefine and extend them.
%
% We begin with extending.
% \begin{macro}{\Describe@Macro}[1]
%   {The macro name, including leading backslash}
% The \cs{Describe@Macro} macro is changed to typeset its agument in
% a \cs{marginnote} instead of an \cs{fbox}.
%    \begin{macrocode}
\def\Describe@Macro#1{%
    \endgroup
    \edef\name{\expandafter\@gobble\string#1}%
    \global\@namedef{href@desc@\name}{}%
    \immediate\write\@mainaux{%
        \global\noexpand\@namedef{href@desc@\name}{}%
    }%
    \hbox\y@bgroup
    \@ifundefined{href@impl@\name}{}{\hyperlink{impl:\name}}%
    {%
        \hbox{
            \vbox to 0pt{
                \vss\hbox{
                    \raisebox{4ex}{\hypertarget{desc:\name}{}
                }
            }
        }%
        \marginnote{\llap{\PrintMacroName{#1}}}
        }%
    }%
    \ydoc@macrocatcodes
    \macroargsstyle
    \read@Macro@arg
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\descframe}[1]
%   {Contents to be framed}
% Similarly, \cs{descframe} is changed to produce an \cs{mbox}
% instead of an \cs{fbox}.
%    \begin{macrocode}
\def\descframe#1{%
    \mbox{\hspace*{1.5\descsep}#1\hspace*{2\descsep}}%
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\PrintMacroName}[1]
%   {Macro name to be printed}
% \cs{PrintMacroName} is hooked to also index the macro name while
% printing it.
%    \begin{macrocode}
\let\old@PrintMacroName\PrintMacroName
\DeclareDocumentCommand\PrintMacroName{m}{%
    \index@macro*{\expandafter\@gobble\string#1}
    \old@PrintMacroName{#1}
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\PrintEnvName}[2]
%   {Either \cs{end} or \cs{begin}}
%   {Name of the environment to be printed}
% Similarly to \cs{PrintMacroName}, the \cs{PrintEnvName} is hooked
% to index the environment when printing the \cs{begin} part of the
% environment.
%    \begin{macrocode}
\let\old@PrintEnvName\PrintEnvName
\def\PrintEnvName#1#2{
    \ifx#1\begin
        \edef\skdoc@temp{\noexpand\index@environment*{#2}}
        \skdoc@temp
    \fi
    \old@PrintEnvName{#1}{#2}
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\DescribeEnv}[2]
%   {Environment body or \cs{NoValue}}
%   {Environment name}
%    \begin{macrocode}
\DeclareDocumentCommand\DescribeEnv{om}{
    \medskip\par\noindent
    \marginnote{
        \envcodestyle
        \hfill\llap{\PrintEnvName{\begin}{#2}}\mbox{}\\
        \IfNoValueTF{#1}{}{\hfill\llap{\MacroArgs#1}\mbox{}\\}
        \hfill\llap{\PrintEnvName{\end}{#2}}\mbox{}\\
    }
    \begingroup
    \def\after@Macro@args{\endDescribeEnv}
    \y@bgroup
    \ydoc@macrocatcodes
    \macroargsstyle
    \read@Macro@arg
}
\DeclareDocumentCommand\endDescribeEnv{}{
    \endgroup
    \smallskip\par\noindent
}
%    \end{macrocode}
% \end{macro}
%
% Then we add a few of our own. For instance, we add macros to
% typeset descriptions of options. We also undefine the \cs{optpar}
% macro defined by \pkg{ydoc}, since we supersede it with \cs{Option}.
%    \begin{macrocode}
\let\optpar\relax
%    \end{macrocode}
% \begin{macro}{\Options}[1]
%   {A comma-separated list of options}
%    \begin{macrocode}
\DeclareDocumentCommand\Options{m}{
    \clist_set:Nn\l_tmpa_clist{#1}
    \marginnote{
        \clist_map_inline:Nn\l_tmpa_clist{
            \index@option*{####1}
            \hfill
            \llap{\textcolor{opt}{\opt{####1}}}
            \mbox{}\\
        }
    }
    \nobreak
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\Option}[1]
%   {And option}
%    \begin{macrocode}
\DeclareDocumentCommand\Option{m}{
    \Options{#1}
}
%    \end{macrocode}
% \end{macro}
% \begin{macro*}{\skdoc@WithValues@peek}
% \changes{1.2a}{Add \cs{ignorespaces} to fix spacing bug}
%    \begin{macrocode}
\def\skdoc@WithValues@peek{
    \ifx\@let@token\AndDefault\else\par\noindent\nobreak\ignorespaces\fi
}
%    \end{macrocode}
% \end{macro*}
% \begin{macro}{\WithValues}[1]
%   {Values of a key-value option}
% The \cs{WithValues} macro peeks ahead to see if there's an
% \cs{AndDefault} macro further down. It typesets the values of 
% a key-vaue option
%    \begin{macrocode}
\DeclareDocumentCommand\WithValues{m}{
    \noindent\makebox[\linewidth][l]{\texttt{#1}}
    \futurelet\@let@token\skdoc@WithValues@peek
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\AndDefault}[1]
%   {The value of a key-value option}
% Typesets the default value of a key-value option. To the far
% right of the line.
% \changes{1.2a}{Add \cs{ignorespaces} to fix spacing bug}
%    \begin{macrocode}
\DeclareDocumentCommand\AndDefault{m}{
    \llap{\textcolor{gray}{\texttt{(#1)}}}\par\noindent\nobreak\ignorespaces
}
%    \end{macrocode}
% \end{macro}
%
% Similar macros are provided for \hologo{BibTeX} entries.
% \begin{macro}{\BibEntry}[1]
%   {The name of the \hologo{BibTeX} entry}
%    \begin{macrocode}
\DeclareDocumentCommand\BibEntry{m}{
    \marginnote{
        \index@bibentry*{#1}
        \hfill\llap{\textcolor{macrodesc}{\bib{#1}}}
    }
    \nobreak
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\WithFields}[2]
%   {Optional fields}
%   {Mandatory fields}
% \changes{1.2a}{Add \cs{ignorespaces} to fix spacing bug}
%    \begin{macrocode}
\DeclareDocumentCommand\WithFields{om}{
    \noindent\makebox[\linewidth]{
        \texttt{#2}
        \IfNoValueTF{#1}{}{
            \textcolor{gray}{\texttt{,#2}}
        }
    }
    \par\noindent\nobreak\ignorespaces
}
%    \end{macrocode}
% \end{macro}
%
% A macro for describing themes is supplied.
% \begin{macro}{\Theme}[1]
%   {The theme name}
% \changes{1.2a}{Add \cs{ignorespaces} to fix spacing bug}
%    \begin{macrocode}
\DeclareDocumentCommand\Theme{m}{
    \marginnote{
        \index@theme*{#1}
        \hfill\llap{\textcolor{macrodesc}{\thm{#1}}}
    }
    \nobreak\par\noindent\nobreak\ignorespaces
}
%    \end{macrocode}
% \end{macro}
%
% And finally, a macro for describing files is provided.
% \begin{macro}{\DescribeFile}[1]
%   {The filename}
% \changes{1.2a}{Add \cs{ignorespaces} to fix spacing bug}
%    \begin{macrocode}
\DeclareDocumentCommand\DescribeFile{m}{
    \marginnote{
        \index@file*{#1}
        \hfill\llap{\textcolor{macrodesc}{\file{#1}}}
    }
    \nobreak\par\noindent\nobreak\ignorespaces
}
%    \end{macrocode}
% \end{macro}
%
% Lastly, we define an envionment for showing examples. It's quite
% complex, utilizing (and kind of hacking) \cs{skdoc@verbatim} and
% typesetting the content using \pkg{l3coffins}.
%
% First, three dimensions used in constructing the side-by-side boxes.
% \begin{macro}{\c__skdoc_example_margin_dim}
% This dimension, set to half of \cs{baselineskip}, dictates the margin
% between the content of the coffins and the dividing ruler.
%    \begin{macrocode}
\dim_const:Nn\c__skdoc_example_margin_dim{0.5\baselineskip}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\c__skdoc_example_linewidth_dim}
% This dimension sets the width of the dividing ruler.
%    \begin{macrocode}
\dim_const:Nn\c__skdoc_example_linewidth_dim{1pt}
%    \end{macrocode}
% \end{macro}
%
% Next, three coffins used by the \env{example} environment are defined.
% One for code, one for the divider and one for the result.
% \begin{macro}{\l__skdoc_example_code_coffin}
%    \begin{macrocode}
\coffin_new:N\l__skdoc_example_code_coffin
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\l__skdoc_example_divider_coffin}
%    \begin{macrocode}
\coffin_new:N\l__skdoc_example_divider_coffin
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\l__skdoc_example_result_coffin}
%    \begin{macrocode}
\coffin_new:N\l__skdoc_example_result_coffin
%    \end{macrocode}
% \end{macro}
%
% Finally, we can define the actual \env{example} environment!
% \begin{environment}{example}
% \changes{1.2}{Print example code next to the result}
%    \begin{macrocode}
\DeclareDocumentEnvironment{example}{}{
%    \end{macrocode}
% The environment starts by priting a small header indicating that
% the content is in fact an example. It also sets a couple of counters
% and IO variables to trick \cs{skdoc@verbatim} into thinking that it's
% actually writing to a defined output file.
%    \begin{macrocode}
    \bool_gset_true:N\g__skdoc_in_example_bool%
    \minisec{Example:}%
    \int_zero_new:c{skdoc@output@skdoc@private@example@line}%
    \tl_if_exist:cTF{skdoc@output@skdoc@private@example}{
        \tl_clear:c{skdoc@output@skdoc@private@example}
    }{
        \tl_new:c{skdoc@output@skdoc@private@example}
    }
%    \end{macrocode}
% Next, we calculate the coffin width. We do this locally, not in a
% global constant, since we may be somewhere where \cs{textwidth}
% might have changed.
%    \begin{macrocode}
    \dim_set:Nn\l_tmpa_dim{ \textwidth/2
                           -\c__skdoc_example_margin_dim
                           -\c__skdoc_example_linewidth_dim/2}
%    \end{macrocode}
% The code coffin is now filled, after clearing it. It'll get filled
% with the contents of the verbatim environment, typeset like other
% \env{MacroCode} environments in the document (\emph{i.e.} \pkg{minted}
% if possible).
%    \begin{macrocode}
    \coffin_clear:N\l__skdoc_example_code_coffin
    \vcoffin_set:Nnw\l__skdoc_example_code_coffin{\l_tmpa_dim}
    \skdoc@verbatim{skdoc@private@example}
}{
    \endskdoc@verbatim
    \vcoffin_set_end:
%    \end{macrocode}
% Next comes the example result coffin. After clearing it, it gets
% filled by writing the contents of the token list defined previously
% (the one \cs{skdoc@verbatim} is tricked into writing to) to a
% temporary file, then reading that temporary file using \cs{input}.
% We leave the temporary file behind; cleaning up requires \cs{write18}.
% Also: Meh.
%    \begin{macrocode}
    \coffin_clear:N\l__skdoc_example_result_coffin
    \vcoffin_set:Nnw\l__skdoc_example_result_coffin{\l_tmpa_dim}
    \iow_open:Nn\skdoc@output{\jobname.skdoc.tmp}
    \iow_now:Nx\skdoc@output{\tl_to_str:c{skdoc@output@skdoc@private@example}}
    \iow_close:N\skdoc@output
    \input{\jobname.skdoc.tmp}
    \vcoffin_set_end:
%    \end{macrocode}
% The divider coffin, being dependent on the height of the two previous
% coffins, is also reset every time. After clearing, we calculate the
% maximum height of the two coffins, and add two margins (top and
% bottom). This value is used to typeset a (gray) rule of the width
% specified earlier (by \cs{c__skdoc_example_linewidth_dim}). Margins
% are also added to either side of this rule.
%    \begin{macrocode}
    \coffin_clear:N\l__skdoc_example_divider_coffin
    \dim_set:Nn\l_tmpa_dim{
        \dim_max:nn{\coffin_ht:N\l__skdoc_example_code_coffin}%
                   {\coffin_ht:N\l__skdoc_example_result_coffin}
        + 2\c__skdoc_example_margin_dim}
    \hcoffin_set:Nn\l__skdoc_example_divider_coffin{
        \color{lightgray}
        \hspace*{\c__skdoc_example_margin_dim}
        \rule{\c__skdoc_example_linewidth_dim}{\l_tmpa_dim}
        \hspace*{\c__skdoc_example_margin_dim}
    }
%    \end{macrocode}
% It's finally time to join and typeset the coffins. We clear a temporary
% coffin, copy the divider into it, and proceed to attach the example
% result coffin to the left and the code to the right (vertical centers
% touching, so that they are \enquote{centered} vertically). The
% temporary coffin is then typeset.
%    \begin{macrocode}
    \coffin_clear:N\l_tmpa_coffin
    \coffin_set_eq:NN\l_tmpa_coffin\l__skdoc_example_divider_coffin
    \coffin_join:NnnNnnnn\l_tmpa_coffin{l}{vc}%
                         \l__skdoc_example_result_coffin{r}{vc}%
                         {0pt}{0pt}
    \coffin_join:NnnNnnnn\l_tmpa_coffin{r}{vc}%
                         \l__skdoc_example_code_coffin{l}{vc}%
                         {0pt}{0pt}
    \coffin_typeset:Nnnnn\l_tmpa_coffin{T}{l}{0pt}{0pt}
    \bool_gset_false:N\g__skdoc_in_example_bool%
    \vspace*{\c__skdoc_example_margin_dim}\par
}
%    \end{macrocode}
% \end{environment}
%
% \subsubsection{Implementation environment}
% We define environments that encase the implementation of macros,
% environments, options, \hologo{BibTeX} entry types and themes.
% Watch out---there's a lot of duplicate code here.
% \begin{environment}{macro}[3]
%   {True if this is the starred variant}
%   {Name of the macro being implemented}
%   {If given, the number of arguments that
%            \cs{macro@impl@args} will read}
%    \begin{macrocode}
\DeclareDocumentEnvironment{macro}{smo}{%
    \IfBooleanTF{#1}{}{\@bsphack}
    \index@macro!{\expandafter\@gobble\string#2}
    \@macroname{#2}%
    \IfBooleanTF{#1}{
        \IfNoValueTF{#3}{}{
            \int_compare:nNnTF{#3}>{0}{
                \use:c{use_none:\prg_replicate:nn{#3}{n}}
            }{}
        }
    }{
        \PrintMacroImpl{#2}
        \IfNoValueTF{#3}{
            \macro@impl@argline@noarg{(no~arguments)}
        }{\macro@impl@args[#3]}
    }%
}{
    \let\skdoc@macroname@key\@empty
    \IfBooleanTF{#1}{}{\par\@esphack}
}
%    \end{macrocode}
% \end{environment}
% \begin{environment}{environment}[3]
%   {True if this is the starred variant}
%   {Name of the environment being implemented}
%   {If given, the number of arguments that
%            \cs{macro@impl@args} will read}
%    \begin{macrocode}
\DeclareDocumentEnvironment{environment}{smo}{%
    \IfBooleanTF{#1}{}{\@bsphack}
    \index@environment!{#2}
    \@environmentname{#2}%
    \IfBooleanTF{#1}{
        \IfNoValueTF{#3}{}{
            \int_compare:nNnTF{#3}>{0}{
                \use:c{use_none:\prg_replicate:nn{#3}{n}}
            }{}
        }
    }{
        \PrintEnvImplName{#2}
        \IfNoValueTF{#3}{
            \macro@impl@argline@noarg{(no~arguments)}
        }{\macro@impl@args[#3]}
    }%
}{
    \let\skdoc@macroname@key\@empty
    \IfBooleanTF{#1}{}{\par\@esphack}
}
%    \end{macrocode}
% \end{environment}
% \begin{environment}{option}[3]
%   {True if this is the starred variant}
%   {Name of the option being implemented}
%   {Values this key-value option can take}
%    \begin{macrocode}
\DeclareDocumentEnvironment{option}{smg}{%
    \IfBooleanTF{#1}{}{\@bsphack}
    \index@option!{#2}
    \@optionname{#2}%
    \IfBooleanTF{#1}{}{
        \vspace{\baselineskip}
        \PrintEnvImplName{#2}
        \IfNoValueTF{#3}{
            \macro@impl@argline@noarg{(option)}
        }{
            \macro@impl@argline@noarg{
                Option~with~values~\texttt{\textcolor{gray}{#3}}
            }
        }
    }%
}{
    \let\skdoc@macroname@key\@empty
    \IfBooleanTF{#1}{}{\par\@esphack}
}
%    \end{macrocode}
% \end{environment}
% \begin{environment}{bibentry}[2]
%   {True if this is the starred variant}
%   {Name of the \hologo{BibTeX} entry type being implemented}
%    \begin{macrocode}
\DeclareDocumentEnvironment{bibentry}{sm}{%
    \IfBooleanTF{#1}{}{\@bsphack}
    \index@bibentry!{\expandafter\@gobble\string#2}
    \@bibentryname{#2}%
    \IfBooleanTF{#1}{}{
        \vspace{\baselineskip}
        \PrintEnvImplName{#2}
        \macro@impl@argline@noarg{(\hologoRobust{BibTeX}~entry~type)}
    }%
}{
    \let\skdoc@macroname@key\@empty
    \IfBooleanTF{#1}{}{\par\@esphack}
}
%    \end{macrocode}
% \end{environment}
% \begin{environment}{theme}[2]
%   {True if this is the starred variant}
%   {Name of the theme being implemented}
%    \begin{macrocode}
\DeclareDocumentEnvironment{theme}{sm}{%
    \IfBooleanTF{#1}{}{\@bsphack}
    \index@theme!{#2}
    \@themename{#2}%
    \IfBooleanTF{#1}{}{
        \vspace{\baselineskip}
        \PrintEnvImplName{#2}
        \macro@impl@argline@noarg{(theme)}
    }%
}{
    \let\skdoc@macroname@key\@empty
    \IfBooleanTF{#1}{}{\par\@esphack}
}
%    \end{macrocode}
% \end{environment}
% We also provide starred variants of the environments, which will
% add the implementation to the index but not print anything.
% \begin{environment}{macro*}[2]
%   {Name of the macro being implemented}
%   {If given, the number of arguments that
%            \cs{macro@impl@args} will read}
%    \begin{macrocode}
\DeclareDocumentEnvironment{macro*}{mo}%
    {\begin{macro}*{#1}[#2]}{\end{macro}}
%    \end{macrocode}
% \end{environment}
% \begin{environment}{environment*}[2]
%   {Name of the environment being implemented}
%   {If given, the number of arguments that
%            \cs{macro@impl@args} will read}
%    \begin{macrocode}
\DeclareDocumentEnvironment{environment*}{mo}%
    {\begin{environment}*{#1}[#2]}{\end{environment}}
%    \end{macrocode}
% \end{environment}
% \begin{environment}{option*}[2]
%   {Name of the option being implemented}
%   {Values this key-value option can take}
%    \begin{macrocode}
\DeclareDocumentEnvironment{option*}{mg}%
    {\begin{option}*{#1}{#2}}{\end{option}}
%    \end{macrocode}
% \end{environment}
% \begin{environment}{bibentry*}[1]
%   {Name of the \hologo{BibTeX} entry type being implemented}
%    \begin{macrocode}
\DeclareDocumentEnvironment{bibentry*}{m}%
    {\begin{bibentry}*{#1}}{\end{bibentry}}
%    \end{macrocode}
% \end{environment}
% \begin{environment}{theme*}[1]
%   {Name of the theme being implemented}
%    \begin{macrocode}
\DeclareDocumentEnvironment{theme*}{m}%
    {\begin{theme}*{#1}}{\end{theme}}
%    \end{macrocode}
% \end{environment}
% And finally, we redefine some of the underlying \pkg{ydoc} macros
% to behave the way we want them to.
% For instance, we redefine the commands that print environment and
% macro implementation names so that they typeset the name i a
% \cs{marginnote} rather than in an \cs{fbox}.
% \begin{macro}{\PrintEnvImplName}[1]
%   {The environment name to be printed}
% \changes{1.3}{Fixed incorrect spacing}
%    \begin{macrocode}
\def\PrintEnvImplName#1{%
    \par\leavevmode\null
    \hbox{%
        \marginnote{\llap{\implstyle{#1\strut}}}%
    }
    \null
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\PrintMacroImpl}[1]
%   {The macro name to be printed}
%    \begin{macrocode}
\def\PrintMacroImpl#1{%
    \par
    \hbox{%
        \edef\name{\expandafter\@gobble\string#1}%
        \global\@namedef{href@impl@\name}{}%
        \immediate\write\@mainaux{%
            \global\noexpand\@namedef{href@impl@\name}{}%
        }%
        \raisebox{4ex}[4ex]{\hypertarget{impl:\name}{}}%
        \@ifundefined{href@desc@\name}{}{\hyperlink{desc:\name}}%
        \marginnote{\llap{\PrintMacroImplName{#1}}}%
    }%
    \par
}
%    \end{macrocode}
% \end{macro}
% We also redefine the utility macros belonging to \cs{macro@impl@arg}.
% \begin{macro*}{\macro@impl@argline}[2]
%   {The argument number}
%   {Description of the argument}
%    \begin{macrocode}
\def\macro@impl@argline#1#2{%
    \par\noindent{\texttt{\##1}:~#2\strut}%
}
%    \end{macrocode}
% \end{macro*}
% \begin{macro*}{\macro@impl@args}[1]
%   {The number of arguments to read}
%    \begin{macrocode}
\def\macro@impl@args[#1]{%
    \vspace*{-\baselineskip}
    \begingroup
    \let\macro@impl@argcnt\@tempcnta
    \let\macro@impl@curarg\@tempcntb
    \macro@impl@argcnt=#1\relax
    \macro@impl@curarg=0\relax
    \ifnum\macro@impl@curarg<\macro@impl@argcnt\relax
        \expandafter\macro@impl@arg
    \else
        \expandafter\macro@impl@endargs
    \fi
}
%    \end{macrocode}
% \end{macro*}
% \begin{macro*}{\macro@impl@arg@noopt}
%    \begin{macrocode}
\def\macro@impl@arg@noopt#1{%
    \macro@impl@argline{\the\macro@impl@curarg}{#1}
    \ifnum\macro@impl@curarg<\macro@impl@argcnt\relax
        \expandafter\macro@impl@arg
    \else
        \expandafter\macro@impl@endargs
    \fi
}
%    \end{macrocode}
% \end{macro*}
% \begin{macro*}{\macro@impl@arg@opt}
%    \begin{macrocode}
\def\macro@impl@arg@opt#1[#2]{%
    \macro@impl@argline{\the\macro@impl@curarg}
        {#1\hfill\AndDefault{#1}\vspace{-\baselineskip}}
    \ifnum\macro@impl@curarg<\macro@impl@argcnt\relax
        \expandafter\macro@impl@arg
    \else
        \expandafter\macro@impl@endargs
    \fi
}
%    \end{macrocode}
% \end{macro*}
% \begin{macro*}{\macro@impl@arg}
%    \begin{macrocode}
\def\macro@impl@arg#1{%
    \advance\macro@impl@curarg by\@ne\relax
    \@ifnextchar[%]
        {\macro@impl@arg@opt{#1}}%
        {\macro@impl@arg@noopt{#1}}%
}
%    \end{macrocode}
% \end{macro*}
% \begin{macro*}{\macro@impl@endargs}
% \changes{1.3b}{Conditionally don't add space if another environment follows}
%    \begin{macrocode}
\def\macro@impl@endargs{
    \endgroup
    \peek_meaning_ignore_spaces:NTF\begin
        {
            \vspace{-\baselineskip}
            \bool_gset_true:N\g__skdoc_negative_space_bool
            \PushPreHook{par}{
                \bool_gset_false:N\g__skdoc_negative_space_bool
                \PopPreHook{par}
            }
        }
        {\par\medskip}%
}
%    \end{macrocode}
% \end{macro*}
% \begin{macro*}{\macro@impl@argline@noarg}[1]
%   {The line to print instead of an argument line}
% \changes{1.3b}{Conditionally don't add space if another environment follows}
% This last macro is a replacement used when there are no arguments
% or if the implementation is an option or something like that. It
% behaves pretty much like \cs{macro@impl@args}, but with only one
% argument to read.
%    \begin{macrocode}
\def\macro@impl@argline@noarg#1{%
    \vspace*{-\baselineskip}
    \par\noindent{#1\strut}
    \peek_meaning_ignore_spaces:NTF\begin
        {
            \vspace{-\baselineskip}
            \bool_gset_true:N\g__skdoc_negative_space_bool
            \PushPreHook{par}{
                \bool_gset_false:N\g__skdoc_negative_space_bool
                \PopPreHook{par}
            }
        }
        {\par\medskip}%
}
%    \end{macrocode}
% \end{macro*}
%
% \subsection{The index}
% \begin{macro*}{\__skdoc_if_do_index:T}
% \begin{macro*}{\__skdoc_if_do_index:F}
% \begin{macro*}{\__skdoc_if_do_index:TF}
% \begin{macro}{\__skdoc_if_do_index_p:}
%    \begin{macrocode}
\prg_new_conditional:Nnn\__skdoc_if_do_index:{p,T,F,TF}{
    \bool_if:nTF{
        \__skdoc_if_print_code_p: &&
        !\g__skdoc_no_index_bool
    }{
        \prg_return_true:
    }{
        \prg_return_false:
    }
}
%    \end{macrocode}
% \end{macro}
% \end{macro*}
% \end{macro*}
% \end{macro*}
% The index is based on \pkg{glossaries}, and as such the whole
% process of adding entries to the index is reduced to adding
% glossary entries. This is done through two wrapper macros around
% the \cs{newglossaryentry} macro.
% \begin{macro}{\@index@}[1]
%   {The key of the index entry}
%   {The text of the index entry}
% What \cs{@index@} does is to decide wether we are hiding the
% implementation part of the documentation (discussed later), and
% wether we are in the actual implementation or not. If we are in
% the implementation and aren't printing it, we shouldn't add an
% index entry.
%    \begin{macrocode}
\DeclareDocumentCommand\@index@{mm}{
    \__skdoc_if_do_index:T{
        \@index@@{#1}{#2}
    }
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\@index@@}[2]
%   {The key of the index entry}
%   {The text of the index entry}
% This macro does the actual adding to the glossary.
%    \begin{macrocode}
\DeclareDocumentCommand\@index@@{mm}{
    \newglossaryentry{index-#1}{
        type=index,
        name={#2},
        description={\nopostdesc},
        sort={#1}
    }
}
%    \end{macrocode}
% \end{macro}
%
% \subsubsection{Adding index entries}
% These macros add an index entry with different contents depending
% on the thing (macro, environment, etc.) that is being indexed. They
% all have non-starred variants which are used by the referring
% macros (\cs{cs} \emph{et. al}), and starred variants used by the 
% description macros (the star affects the style of the page number).
% Each environment first test wether the given entry key exists, and
% defines a new entry if it doesn't. Then, a usage of the entry is
% recorded.
% There is also a exclamation variant that is used by the implementation
% environments, that typesets a normal use of the entity.
%
% Note the duplicate use of \cs{ifglsentryexists} --- this is needed
% since \cs{@index@} doesn't always add the entity to the index
% \emph{i.e.} nothing in the implementation is added when we're hiding
% the implementation.
% \begin{macro}{\index@macro}[3]
%   {True if this is the starred variant}
%   {True if this is the exclamation variant}
%   {The name of the macro being indexed, without backslash}
%    \begin{macrocode}
\DeclareDocumentCommand\index@macro{st!m}{
    \def\skdoc@temp{#3-macro}
    \ifglsentryexists{index-\skdoc@temp}{}{
        \@index@{#3-macro}{\cs*{#3}}
    }
    \__skdoc_if_do_index:T{
        \IfBooleanTF{#2}{
            \glsadd[types=index,format=hyperul]{index-\skdoc@temp}
        }{
            \IfBooleanTF{#1}{
                \glsadd[types=index,format=hyperit]{index-\skdoc@temp}
            }{
                \glsadd[types=index]{index-\skdoc@temp}
            }
        }
    }
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\index@environment}[3]
%   {True if this is the starred variant}
%   {True if this is the exclamation variant}
%   {The name of the environment being indexed}
%    \begin{macrocode}
\DeclareDocumentCommand\index@environment{st!m}{
    \def\skdoc@temp{\string#3-env}
    \ifglsentryexists{index-\skdoc@temp}{}{
        \@index@{\string#3-env}{\env*{\string#3}~(environment)}
    }
    \__skdoc_if_do_index:T{
        \IfBooleanTF{#2}{
            \glsadd[types=index,format=hyperul]{index-\skdoc@temp}
        }{
            \IfBooleanTF{#1}{
                \glsadd[types=index,format=hyperit]{index-\skdoc@temp}
            }{
                \glsadd[types=index]{index-\skdoc@temp}
            }
        }
    }
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\index@option}[3]
%   {True if this is the starred variant}
%   {True if this is the exclamation variant}
%   {The name of the option being indexed}
%    \begin{macrocode}
\DeclareDocumentCommand\index@option{st!m}{
    \def\skdoc@temp{\string#3-opt}
    \ifglsentryexists{index-\skdoc@temp}{}{
        \@index@{\string#3-opt}{\opt*{\string#3}~(option)}
    }
    \__skdoc_if_do_index:T{
        \IfBooleanTF{#2}{
            \glsadd[types=index,format=hyperul]{index-\skdoc@temp}
        }{
            \IfBooleanTF{#1}{
                \glsadd[types=index,format=hyperit]{index-\skdoc@temp}
            }{
                \glsadd[types=index]{index-\skdoc@temp}
            }
        }
    }
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\index@bibentry}[3]
%   {True if this is the starred variant}
%   {True if this is the exclamation variant}
%   {The name of the \hologo{BibTeX} entry type
%       being indexed, without initial \texttt{@} sign}
%    \begin{macrocode}
\DeclareDocumentCommand\index@bibentry{st!m}{
    \def\skdoc@temp{#3-bib}
    \ifglsentryexists{index-\skdoc@temp}{}{
        \@index@{#3-bib}{\bib*{#3}~(\hologoRobust{BibTeX}~entry~type)}
    }
    \__skdoc_if_do_index:T{
        \IfBooleanTF{#2}{
            \glsadd[types=index,format=hyperul]{index-\skdoc@temp}
        }{
            \IfBooleanTF{#1}{
                \glsadd[types=index,format=hyperit]{index-\skdoc@temp}
            }{
                \glsadd[types=index]{index-\skdoc@temp}
            }
        }
    }
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\index@theme}[3]
%   {True if this is the starred variant}
%   {True if this is the exclamation variant}
%   {The name of the theme being indexed}
%    \begin{macrocode}
\DeclareDocumentCommand\index@theme{st!m}{
    \def\skdoc@temp{\string#3-theme}
    \ifglsentryexists{index-\skdoc@temp}{}{
        \@index@{\string#3-theme}{\thm*{\string#3}~(theme)}
    }
    \__skdoc_if_do_index:T{
        \IfBooleanTF{#2}{
            \glsadd[types=index,format=hyperul]{index-\skdoc@temp}
        }{
            \IfBooleanTF{#1}{
                \glsadd[types=index,format=hyperit]{index-\skdoc@temp}
            }{
                \glsadd[types=index]{index-\skdoc@temp}
            }
        }
    }
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\index@package}[3]
%   {True if this is the starred variant}
%   {True if this is the exclamation variant}
%   {The name of the package being indexed}
%    \begin{macrocode}
\DeclareDocumentCommand\index@package{st!m}{
    \def\skdoc@temp{\string#3-pkg}
    \ifglsentryexists{index-\skdoc@temp}{}{
        \@index@{\string#3-pkg}{\pkg*{\string#3}~(package)}
    }
    \__skdoc_if_do_index:T{
        \IfBooleanTF{#2}{
            \glsadd[types=index,format=hyperul]{index-\skdoc@temp}
        }{
            \IfBooleanTF{#1}{
                \glsadd[types=index,format=hyperit]{index-\skdoc@temp}
            }{
                \glsadd[types=index]{index-\skdoc@temp}
            }
        }
    }
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\index@file}[3]
%   {True if this is the starred variant}
%   {True if this is the exclamation variant}
%   {The name of the file being indexed}
%    \begin{macrocode}
\DeclareDocumentCommand\index@file{st!m}{
    \def\skdoc@temp{\string#3-file}
    \ifglsentryexists{index-\skdoc@temp}{}{
        \@index@{\string#3-file}{\file*{\string#3}~(file)}
    }
    \__skdoc_if_do_index:T{
        \IfBooleanTF{#2}{
            \glsadd[types=index,format=hyperul]{index-\skdoc@temp}
        }{
            \IfBooleanTF{#1}{
                \glsadd[types=index,format=hyperit]{index-\skdoc@temp}
            }{
                \glsadd[types=index]{index-\skdoc@temp}
            }
        }
    }
}
%    \end{macrocode}
% \end{macro}
%
% Notice the references to \cs{hyperul}? We need to define that as
% well. It's simple enough. Note that \cs{GlsAddXdyAttribute} isn't
% called until later.
% \begin{macro}{\hyperul}[1]
%   {Word to underline and link}
%    \begin{macrocode}
\ProvideDocumentCommand\hyperul{m}{
    \underline{\hyperup{#1}}
}
%    \end{macrocode}
% \end{macro}
%
% \subsubsection{Displaying the index}
% Displaying the index is very simple. We begin by defining
% our own \pkg{glossaries} style.
%    \begin{macrocode}
\newglossarystyle{docindex}{
    \glossarystyle{indexgroup}
    \renewcommand*{\glspostdescription}{\unskip\leaders\hbox to 2.9mm{\hss.}\hfill\strut}
    \renewenvironment{theglossary}{
        \bool_gset_true:N\g__skdoc_no_index_bool
        \begin{multicols}{2}
        \setlength{\parindent}{0pt}
        \setlength{\parskip}{0pt plus 0.3pt}
        \let\item\@idxitem
    }{
        \end{multicols}
        \bool_gset_false:N\g__skdoc_no_index_bool
    }
    \renewcommand*{\glossaryentryfield}[5]{
        \item\glsentryitem{##1}\glstarget{##1}{##2}
            \ifx\relax##4\relax\else\space(##4)\fi
            ##3\glspostdescription\space ##5}
    \renewcommand*{\glsgroupheading}[1]{
        \IfStrEq{##1}{default}{
            \item{\descfont\glssymbolsgroupname}
        }{
            \item{\descfont\glsgetgrouptitle{##1}}
        }
    }
    \renewcommand*{\glsgroupskip}{
        \par\vspace{15\p@}\relax
    }
}
%    \end{macrocode}
% We follow that up by defining the actual glossay, and making sure
% to run \cs{makeglossaries} when the preamble is complete.
%    \begin{macrocode}
\newglossary{index}{ids}{ido}{Index}
\AtBeginDocument{\makeglossaries}
%    \end{macrocode}
% \begin{macro}{\PrintIndex}
% \changes{1.2}{Fixed incorrect reference to boldfaced text}
% Finally, we define a command \cs{PrintIndex} that prints the index.
% Note the preamble that describes how the index page numbers work.
%    \begin{macrocode}
\providecommand*\PrintIndex{%
    \begingroup
    \renewcommand*{\glossarypreamble}{
        Numbers~written~in~italic~refer~to~the~page~where~the~
        corresponding~entry~is~described;~numbers~underlined~refer~
        to~the~page~were~the~implementation~of~the~corresponding~
        entry~is~discussed.~Numbers~in~roman~refer~to~other~
        mentions~of~the~entry.\par
    }
    \printglossary[type=index,style=docindex]
    \endgroup
}
%    \end{macrocode}
% \end{macro}
%
% \subsubsection{Hacking \pkg{glossaries}}
% The following redefinition of an internal \pkg{glossaries} macro,
% provided by \textcite{Talbot13}, makes sure that the underlined
% and italic page numbers in the index have precedence over the plain
% nubmer format. In the event that a macro is described and implemented
% on the same page, the description format (italic) is used.
% \begin{macro}{\@gls@addpredefinedattributes}
% \changes{1.4a}{Add Xdy attribute \texttt{@gobble}}
%    \begin{macrocode}
\RenewDocumentCommand\@gls@addpredefinedattributes{}{
    \GlsAddXdyAttribute{hyperit}
    \GlsAddXdyAttribute{hyperul}
    \GlsAddXdyAttribute{glsnumberformat}
    \GlsAddXdyAttribute{@gobble}
}
%    \end{macrocode}
% \end{macro}
%
% \subsection{The changelog}
% The changelog is implemented as a glossary using the
% \pkg{glossaries} package. We begin by defining a name
% for general changes, and commands that save the name of
% the current macro, environment or similar for use by the
% \cs{changes} macro.
% \begin{macro}{\generalname}
%    \begin{macrocode}
\DeclareDocumentCommand\generalname{}{General}
%    \end{macrocode}
% \end{macro}
% \begin{macro*}{\@macroname}[1]
%   {Name of the macro being described}
%    \begin{macrocode}
\DeclareDocumentCommand\@macroname{m}{
    \def\skdoc@macroname@stylized{\cs*{\expandafter\@gobble\string#1}}
    \def\skdoc@macroname@key{macro-\expandafter\@gobble\string#1}
}
%    \end{macrocode}
% \end{macro*}
% \begin{macro*}{\@environmentname}[1]
%   {Name of the environment being described}
%    \begin{macrocode}
\DeclareDocumentCommand\@environmentname{m}{
    \def\skdoc@macroname@stylized{\env*{\string#1}}
    \def\skdoc@macroname@key{env-#1}
}
%    \end{macrocode}
% \end{macro*}
% \begin{macro*}{\@optionname}[1]
%   {Name of the option being described}
%    \begin{macrocode}
\DeclareDocumentCommand\@optionname{m}{
    \def\skdoc@macroname@stylized{\opt*{\string#1}}
    \def\skdoc@macroname@key{opt-#1}
}
%    \end{macrocode}
% \end{macro*}
% \begin{macro*}{\@ebibentryname}[1]
%   {Name of the \hologo{BibTeX} entry being described}
%    \begin{macrocode}
\DeclareDocumentCommand\@bibentryname{m}{
    \def\skdoc@macroname@stylized{\bib*{\expandafter\@gobble\string#1}}
    \def\skdoc@macroname@key{bibentry-\expandafter\@gobble\string#1}
}
%    \end{macrocode}
% \end{macro*}
% \begin{macro*}{\@themename}[1]
%   {Name of the theme being described}
%    \begin{macrocode}
\DeclareDocumentCommand\@themename{m}{
    \def\skdoc@macroname@stylized{\thm*{\string#1}}
    \def\skdoc@macroname@key{thm-#1}
}
%    \end{macrocode}
% \end{macro*}
% Along with these we also define the variables they affect as empty.
%    \begin{macrocode}
\def\skdoc@macroname@stylized{}
\let\skdoc@macroname@key\@empty
%    \end{macrocode}
%
% \subsubsection{Adding changes}
% Since the changelog is based on \pkg{glossaries}, adding changes
% amounts to simply adding a glossary entry.
% \begin{macro}{\changes}[2]
%   {The version in which the changes were made}
%   {A short description of the changes}
% \changes{1.4a}{Unconditionally add version \enquote{parent} to
%   circumvent strange behaviour by \pkg{glossaries}. Also, gobble
%   page numbers for similar reasons}
%    \begin{macrocode}
\DeclareDocumentCommand\changes{mm}{%
    \@bsphack
    \newglossaryentry{#1}{
        type=changes,
        name={v#1},
        description={\nopostdesc},
        nonumberlist=true
    }
    \ifx\skdoc@macroname@key\@empty
        \newglossaryentry{#1-general}{
            type=changes,
            description={\generalname{}:~#2},
            parent={#1},
            sort={0},
            nonumberlist=true
        }
        \glsadd[types=changes,format=@gobble]{#1-general}
    \else
        \newglossaryentry{#1-\skdoc@macroname@key}{
            type=changes,
            description={\skdoc@macroname@stylized{}:~#2},
            parent={#1},
            sort={\skdoc@macroname@key},
            nonumberlist=true
        }
        \glsadd[types=changes,format=@gobble]{#1-\skdoc@macroname@key}
    \fi
    \@esphack
}
%    \end{macrocode}
% \end{macro}
%
% \subsubsection{Displaying the changelog}
% Displaying the changelog is equally simple. We begin by defining
% our own \pkg{glossaries} style.
%    \begin{macrocode}
\newglossarystyle{changelog}{
    \glossarystyle{altlist}
    \renewenvironment{theglossary}{
        \bool_gset_true:N\g__skdoc_no_index_bool
        \begin{multicols}{2}\begin{description}
    }{
        \end{description}\end{multicols}
        \bool_gset_false:N\g__skdoc_no_index_bool
    }
    \renewcommand*{\glossaryentryfield}[5]{
        \par\vspace{5\p@}\relax
        \item[\glsentryitem{##1}\glstarget{##1}{##2}]
                    \mbox{}\par\nobreak\@afterheading
    }
    \renewcommand{\glossarysubentryfield}[6]{%
        \par\hspace*{\itemindent}
        \glssubentryitem{##2}%
        \glstarget{##2}{\strut}##4\glspostdescription\space ##6
    }
}
%    \end{macrocode}
% We follow that up by defining the actual glossary, and making sure
% to run \cs{makeglossaries} when the preamble is complete.
%    \begin{macrocode}
\newglossary{changes}{gls}{glo}{Changes}
\AtBeginDocument{\makeglossaries}
%    \end{macrocode}
% \begin{macro}{\PrintChanges}
% Finally, we define a command \cs{PrintChanges} that prints the
% list of changes.
%    \begin{macrocode}
\DeclareDocumentCommand\PrintChanges{}{%
    \begingroup
    \printglossary[type=changes,style=changelog]
    \endgroup
}
%    \end{macrocode}
% \end{macro}
%
% \subsection{Hiding the implementation}
% We define commands to hide the implementation from the documentation.
% Here, the ``implementation'' is understood to be everything between
% the \cs{Implementation} and \cs{Finale} macros. What we do is disable
% and/or reset page and section counters for the duration of the
% implementation, and set a shipout hook that simply discards the pages
% while we are in the implementation. A consquence of this is that we
% must force a page break between what's before the implementation and
% what's after, which might look horrible.
%
% We define a counter in which we save the page number we had when
% the implementation started.
%    \begin{macrocode}
\newcounter{skdoc@impl@page}
%    \end{macrocode}
% Then we define the shipout hook. Fairly straight-forward.
%    \begin{macrocode}
\AtBeginShipout{
    \__skdoc_if_print_code:F{\AtBeginShipoutDiscard}
}
%    \end{macrocode}
% \begin{macro}{\OnlyDescription}
% The \cs{OnlyDescription} macro simply toggles the appropriate toggle.
%    \begin{macrocode}
\DeclareDocumentCommand\OnlyDescription{}{
    \bool_gset_false:N\g__skdoc_with_implementation_bool
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\Implementation}
% \changes{1.1a}{Hide references used in the hidden implementation}
% The \cs{Implementation} macro defines all the sectioning commands
% to be empty (saving the old ones), clears the page, saves the page
% number and toggles the appropriate toggle. If \pkg{biblatex} is
% loaded, we start a new \env{refsection} so that we can hide
% references used in the implementation from the final bibliography.
%    \begin{macrocode}
\DeclareDocumentCommand\Implementation{}{
    \bool_if:NF\g__skdoc_with_implementation_bool{
        \clearpage
        \bool_gset_true:N\g__skdoc_in_implementation_bool
        \let\skdoc@old@part\part
        \DeclareDocumentCommand\part{som}{}
        \let\skdoc@old@section\section
        \DeclareDocumentCommand\section{som}{}
        \let\skdoc@old@subsection\subsection
        \DeclareDocumentCommand\subsection{som}{}
        \let\skdoc@old@subsubsection\subsubsection
        \DeclareDocumentCommand\subsubsection{som}{}
        \let\skdoc@old@paragraph\paragraph
        \DeclareDocumentCommand\paragraph{som}{}
        \let\skdoc@old@subparagraph\subparagraph
        \DeclareDocumentCommand\subparagraph{som}{}
        \cs_if_exist:NTF\refsection{\refsection}{}
        \setcounter{skdoc@impl@page}{\value{page}}
    }
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\Finale}
% \changes{1.1a}{Hide references used in the hidden implementation}
% The \cs{Finale} macro basically just undoes what the 
% \cs{Implementation} macro did. If \pkg{biblatex} is used, the
% \env{refsection} environment is ended and the (local) bibliography
% is printed.
%    \begin{macrocode}
\DeclareDocumentCommand\Finale{}{
    \bool_if:NF\g__skdoc_with_implementation_bool{
        \cs_if_exist:NTF\refsection{\printbibliography\endrefsection}{}
        \clearpage
        \bool_gset_false:N\g__skdoc_in_implementation_bool
        \let\part\skdoc@old@part
        \let\section\skdoc@old@section
        \let\subsection\skdoc@old@subsection
        \let\subsubsection\skdoc@old@subsubsection
        \let\paragraph\skdoc@old@paragraph
        \let\subparagraph\skdoc@old@subparagraph
        \setcounter{page}{\value{skdoc@impl@page}}
    }
}
%    \end{macrocode}
% \end{macro}
%
% \subsection{Document metadata}
% \subsubsection{Setting metadata}
% We override a bunch of the general titlepage macros and add a few
% of our own. First, we initialize the underlying variables.
%    \begin{macrocode}
\let\@ctan\@empty%
\let\@repository\@empty%
\let\@plainemail\@empty%
\let\@email\@empty%
\let\@version\@empty%
%    \end{macrocode}
% Then, we define the actual macros.
% \begin{macro}{\package}[2]
%   {A list of key-value options}
%   {The package name}
% The \cs{package} macro sets the package name of the documentation.
% The key-value options are \opt{vcs} and \opt{ctan}.
%    \begin{macrocode}
\DeclareDocumentCommand\package{om}{%
    \keys_define:nn{skdoc@package}{%
        vcs .value_required:,%
        vcs .code:n = \repository{##1},%
        ctan .code:n = \ctan{##1},%
        ctan .default:n = #2%
    }%
    \IfNoValueTF{#1}{}{\keys_set:nn{skdoc@package}{#1}}%
    \def\@package{#2}%
    \title{The~\textbf{\pkg*{\@package}}~package}%
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ctan}[1]
%   {The name of a package or bundle on CTAN}
%    \begin{macrocode}
\DeclareDocumentCommand\ctan{m}{%
    \def\@ctan{\url{http://www.ctan.org/pkg/#1}}%
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\repository}[1]
%   {The URI of an online repository}
%    \begin{macrocode}
\DeclareDocumentCommand\repository{m}{%
    \def\@repository{\url{#1}}%
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\email}[1]
%   {The email address of the author}
%    \begin{macrocode}
\DeclareDocumentCommand\email{m}{%
    \def\@plainemail{#1}%
    \def\@email{\href{mailto:\@plainemail}{\@plainemail}}%
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\version}[1]
%   {The version of the package, with no leading ``v''}
%    \begin{macrocode}
\DeclareDocumentCommand\version{m}{%
    \def\@version{#1}%
}
%    \end{macrocode}
% \end{macro}
% Finally, we set the default package name to \cs{jobname}.
%    \begin{macrocode}
\package{\jobname}
%    \end{macrocode}
%
% \subsubsection{Using metadata}
% We define two macros that read useful metadata; \cs{theversion}
% and \cs{thepackage}. These are used internally by \cs{maketitle}.
% \begin{macro}{\theversion}
%    \begin{macrocode}
\DeclareDocumentCommand\theversion{}{v\@version}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\thepackage}
%    \begin{macrocode}
\DeclareDocumentCommand\thepackage{}{\pkg*{\@package}}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\thepkg}
%    \begin{macrocode}
\DeclareDocumentCommand\thepkg{}{\thepackage}
%    \end{macrocode}
% \end{macro}
% Additionally we define \cs{skdocpdfsettings}, which is also used
% by \cs{maketitle}, to include PDF metadata if the documentation
% is being compiled using \hologo{pdfLaTeX}.
%    \begin{macrocode}
\ifpdf
    \def\skdocpdfsettings{%
        \hypersetup{%
            pdfauthor   = {\@author\space<\@plainemail>},
            pdftitle    = {\@title},
            pdfsubject  = {Documentation~of~LaTeX~package~\@package},
            pdfkeywords = {\@package,~LaTeX,~TeX}
        }%
    }%
\else
    \let\skdocpdfsettings\empty%
\fi
%    \end{macrocode}
%
% \subsection{General document commands}
% Most of the general document commands are defined by the
% \pkg{scrartcl} document class we base ourselves on, but a few
% of them have to be redefined.
%
% \subsubsection{Notices and warnings}
% We define macros to typeset notices and warnings in the documentation
% text. Notices are typeset as \Notice{this is a notice}, and warnings
% are typeset as follows: \Warning{this is a warning}
% A macro for longer warnings is also available:
% \LongWarning{This is a longer warning.}
%
% \begin{macro}{\Notice}[1]
%   {Notice text}
%    \begin{macrocode}
\DeclareDocumentCommand\Notice{m}{
    (\emph{\textbf{Note:}~#1})
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\Warning}[1]
%   {Warning text}
%    \begin{macrocode}
\DeclareDocumentCommand\Warning{+m}{
    \vspace{\baselineskip}
    \par\noindent
    \fbox{\begin{minipage}[c]{\textwidth}
        \centering
        \textbf{Warning:}~#1
    \end{minipage}}
    \vspace{\baselineskip}
    \par
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\LongWarning}[1]
%   {Warning text}
%    \begin{macrocode}
\DeclareDocumentCommand\LongWarning{+m}{
    \Warning{
        \par\noindent
        \begin{minipage}{\textwidth}
            #1
        \end{minipage}
    }
}
%    \end{macrocode}
% \end{macro}
%
% \subsubsection{The title page}
% The title page consists of the \cs{maketitle} and the \env{abstract}.
% We redefine both, inspired slightly by the Prac\TeX\ journal and the
% \pkg{skrapport} document class.
% \begin{macro}{\@maketitle}
%    \begin{macrocode}
\def\@maketitle{%
    \newpage
    \null
    \begin{flushleft}%
    {%
        \Huge\sectfont\@title%
        \ifx\@ctan\@empty\else%
            \footnote{Available~on~\@ctan.}%
        \fi
        \ifx\@repository\@empty\else%
            \footnote{Development~version~available~on~\@repository.}%
        \fi%
        \par%
    }%
    \vskip 1em
    {%
        \Large\@author
        \ifx\@email\@empty\else%
            \space
            \newlength\skdoc@minipage@ew%
            \settowidth{\skdoc@minipage@ew}{%
                \normalsize{$\lceil${\@email}$\rfloor$}}
            \begin{minipage}[b]{\skdoc@minipage@ew}
                \normalsize{$\lceil${\@email}$\rfloor$}
            \end{minipage}\par%
        \fi%
    }%
    \ifx\@version\@empty\else
        \vskip .5em
        {%
            \large Version~\@version\par%
        }%
    \fi
    \end{flushleft}%
    \par\bigskip%
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\maketitle}
%    \begin{macrocode}
\def\maketitle{%
    \begingroup
    \skdocpdfsettings
    \renewcommand\thefootnote{\@fnsymbol\c@footnote}
    \@maketitle
    \setcounter{footnote}{0}
    \skdocpdfsettings
    \endgroup
}
%    \end{macrocode}
% \end{macro}
% \begin{environment}{abstract}
%    \begin{macrocode}
\DeclareDocumentEnvironment{abstract}{}{
    \newlength\skdoc@abstract@tw%
    \newlength\skdoc@abstract@aw%
    \settowidth{\skdoc@abstract@tw}{\descfont\abstractname}%
    \setlength{\skdoc@abstract@aw}{\the\textwidth-\the\skdoc@abstract@tw-2em}%
    \begin{minipage}{\textwidth}
        \begin{minipage}[t]{\skdoc@abstract@tw}%
            \begin{flushright}%
                \leavevmode\descfont\abstractname%
            \end{flushright}%
        \end{minipage}%
        \hspace{1em}%
        \begin{minipage}[t]{\skdoc@abstract@aw}%
}{
        \end{minipage}
    \end{minipage}
}
%    \end{macrocode}
% \end{environment}
%
% \subsubsection{Table of contents}
% The table of contents are redefined to imitate the excellent table
% of contents of the \pkg{microtype} manual.
% \begin{macro*}{\l@section}
%    \begin{macrocode}
\let\l@section@\l@section
\def\l@section{\vskip -.75ex\l@section@}
%    \end{macrocode}
% \end{macro*}
% \begin{macro*}{\l@subsection}
%    \begin{macrocode}
\def\l@subsection{\vskip.35ex\penalty\@secpenalty\@dottedtocline{2}{1.5em}{2.7em}}
%    \end{macrocode}
% \end{macro*}
% \begin{macro*}{l@subsubsection}
%    \begin{macrocode}
\def\l@subsubsection#1#2{
    \leftskip 4.2em
    \parindent 0pt
    {\let\numberline\@gobble{\small #1~[#2]}}
}
%    \end{macrocode}
% \end{macro*}
% \begin{macro*}{\l@table}
%    \begin{macrocode}
\def\l@table{\@dottedtocline{1}{0pt}{1.5em}}
%    \end{macrocode}
% \end{macro*}
% \begin{macro*}{\l@figure}
%    \begin{macrocode}
\def\l@figure{\@dottedtocline{1}{0pt}{1.5em}}
%    \end{macrocode}
% \end{macro*}
%    \begin{macrocode}
\def\@pnumwidth{1.7em}
\AtEndDocument{\addtocontents{toc}{\par}}
%    \end{macrocode}
% \begin{macro}{\tableofcontents}
%    \begin{macrocode}
\let\old@tableofcontents\tableofcontents
\DeclareDocumentCommand\tableofcontents{}{
    \bool_gset_true:N\g__skdoc_no_index_bool
    \microtypesetup{protrusion=false}
    \old@tableofcontents
    \microtypesetup{protrusion=true}
    \bool_gset_false:N\g__skdoc_no_index_bool
}
%    \end{macrocode}
% \end{macro}
%
% \subsubsection{Including the LPPL license}
% A helper macro that includes the LPPL license is also provided.
% \begin{macro}{\PrintLPPL}
%    \begin{macrocode}
\DeclareDocumentCommand\PrintLPPL{}{
    \begingroup
    \IfFileExists{lppl.tex}{
        \let\old@verbatim@font\verbatim@font
        \def\verbatim@font{
            \old@verbatim@font\tiny
        }
        \def\LPPLicense{\begingroup\small}
        \def\endLPPLicense{\endmulticols\endgroup}
        \DeclareDocumentCommand\LPPLsection{m}{
            \section{####1}
        }
        \DeclareDocumentCommand\skdoc@lppl@hack{m}{
            \end{multicols}
            \begin{multicols}{2}
                [\subsection*{####1}][6\baselineskip]
        }
        \DeclareDocumentCommand\LPPLsubsection{m}{
            \subsection*{####1}
            \let\LPPLsubsection\skdoc@lppl@hack
            \begin{multicols}{2}
        }
        \DeclareDocumentCommand\LPPLsubsubsection{m}{
            \subsubsection*{####1}
        }
        \DeclareDocumentCommand\LPPLparagraph{m}{\paragraph*{####1}}
        \DeclareDocumentCommand\LPPLfile{m}{\file{####1}}
        \let\oldmakeatletter\makeatletter
        \long\def\makeatletter####1\makeatother{
            \let\makeatletter\oldmakeatletter
        }
        \setlength\leftmargini{15pt}
        \setlength\leftmarginii{12.5pt}
        \setlength\leftmarginiii{10pt}
        \newenvironment{enum}[1][0]{
            \list\labelenumi{
                \usecounter{enumi}
                \setcounter{enumi}{####1}
                \addtocounter{enumi}{-1}
                \leftmargin 30pt
                \itemindent-15pt
                \labelwidth 15pt
                \labelsep 0pt
                \def\makelabel########1{########1\hss}}
        }{\endlist}
        \input{lppl}
    }{
        \msg_warning:nn{skdoc}{no-lppl}
    }
    \endgroup
}
%    \end{macrocode}
% \end{macro}
%
% \subsection{Cosmetic changes}
% We perform a couple of cosmetic changes to existing features as
% well. First, we set a new header/footer style using the KOMA-script
% \cs{deftripstyle} macro.
%    \begin{macrocode}
\deftripstyle{skdoc}%
    {}{}{}%
    {\small The~\textbf{\pkg*{\@package}}~package,~v\@version}{}{\small\pagemark}
\AfterBeginDocument{\pagestyle{skdoc}}
%    \end{macrocode}
% We also redefine the section level format to set the section numbers
% in the margin, much like the \pkg{microtype} manual.
%    \begin{macrocode}
\RenewDocumentCommand{\othersectionlevelsformat}{m}{%
    \makebox[0pt][r]{%
    \fontfamily{fos}\mdseries\selectfont
    \csname the#1\endcsname\enskip}%
}
%    \end{macrocode}
% Finally, we actually use \pkg{microtype} in the document class, and
% make sure to disable it in the verbatim environments.
% Set up microtype properly
%    \begin{macrocode}
\g@addto@macro\@verbatim{\microtypesetup{activate=false}}
\AtEndOfClass{%
    \microtypesetup{expansion,kerning,spacing,tracking}%
    \DisableLigatures{family = tt*}%
}
%    \end{macrocode}
% We also want numbers on the bibliography headings, if we are loading
% \pkg{biblatex}. If we happen to be loading \pkg{bibtex}, we issue a
% warning instead.
%    \begin{macrocode}
\AtBeginDocument{
    \ifdefined\defbibheading
        \defbibheading{bibliography}[\bibname]{\section{#1}}
    \fi
    \@ifpackageloaded{bibtex}{\msg_warning:nn{skdoc}{bibtex-unsupported}}{}
}
%    \end{macrocode}
% Oh, and we want \cs{marginpar}s on the left, not on the right.
%    \begin{macrocode}
\AtBeginDocument{\reversemarginpar}
%    \end{macrocode}
%
% That's it, we're done!
%    \begin{macrocode}
\endinput
%    \end{macrocode}
% \iffalse
%</class>
% \fi
% \Finale
% \section{Installation}
% The easiest way to install this package is using the package
% manager provided by your \LaTeX\ installation if such a program
% is available. Failing that, provided you have obtained the package
% source (\file{skdoc.dtx} and \file{Makefile}) from either CTAN
% or Github, running \texttt{make install} inside the source directory
% works well. This will extract the documentation and code from
% \file{skdoc.dtx}, install all files into the TDS tree at
% \texttt{TEXMFHOME} and run \texttt{mktexlsr}.
%
% If you want to extract code and documentation without installing
% the package, run \texttt{make all} instead. If you insist on not
% using \texttt{make}, remember that \file{skdoc.cls} is generated
% by running \texttt{tex}, while the documentation is generated by
% running \texttt{pdflatex}.
%
% \PrintChanges
% \PrintIndex
% \printbibliography
% \endinput