docutils.sty
************
Style file for docutils LaTeX output
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

:Copyright: © 2020 Günter Milde
:Licence: Released under the terms of the `2-Clause BSD license`_, in short:

   Copying and distribution of this file, with or without modification,
   are permitted in any medium without royalty provided the copyright
   notice and this notice are preserved.
   This file is offered as-is, without any warranty.

   .. _2-Clause BSD license: http://www.spdx.org/licenses/BSD-2-Clause


:Abstract:  
   Helper commands and element definitions for Docutils_ LaTeX output.
 
:Changelog:
   .. class:: borderless

   ====== ========== =========================================================
   0.1    2020-08-28 initial version
   ====== ========== =========================================================

Installation
============

Copy/Move/Link ``docutils.sty`` to a suitable place in the “TeX Directory
Structure” (TDS_) and run ``texhash``, or place it in the current working
directory (e.g. for testing).

Usage
=====

When generating LaTeX documents from reStructuredText sources,
specify this package with the `"stylesheet"`_ configuration_ option, e.g.
``rst2latex --stylesheet=docutils``.
Alternatively, the Docutils `LaTeX writer` will extract required definitions
and insert them into the preamble of generated documents
(see `Docutils LaTeX Writer`_ for details).


Implementation
==============

::

  \NeedsTeXFormat{LaTeX2e}
  \ProvidesPackage{docutils}
    [2020/08/28 v0.1 macros for Docutils LaTeX output]
  
  
Helpers
-------

duclass::

  % class handling for environments (block-level elements)
  % \begin{DUclass}{spam} tries \DUCLASSspam and
  % \end{DUclass}{spam} tries \endDUCLASSspam
  \ifx\DUclass\undefined % poor man's "provideenvironment"
   \newenvironment{DUclass}[1]%
    {% "#1" does not work in end-part of environment.
     \def\DocutilsClassFunctionName{DUCLASS#1}
       \csname \DocutilsClassFunctionName \endcsname}%
    {\csname end\DocutilsClassFunctionName \endcsname}%
  \fi
  
providelength::

  % Provide a length variable and set default, if it is new
  \providecommand*{\DUprovidelength}[2]{
    \ifthenelse{\isundefined{#1}}{\newlength{#1}\setlength{#1}{#2}}{}
  }
  
  
Configuration defaults
----------------------

See `Docutils LaTeX Writer`_ for details.

abstract::

  \providecommand*{\DUCLASSabstract}{
    \renewcommand{\DUtitle}[1]{\centerline{\textbf{##1}}}
  }
  
dedication::

  % special topic for dedications
  \providecommand*{\DUCLASSdedication}{%
    \renewenvironment{quote}{\begin{center}}{\end{center}}%
  }
  
TODO: add \em to set dedication text in italics?

docinfo::

  % width of docinfo table
  \DUprovidelength{\DUdocinfowidth}{0.9\linewidth}
  
error::

  \providecommand*{\DUCLASSerror}{\color{red}}
  
highlight_rules::

  % basic code highlight:
  \providecommand*\DUrolecomment[1]{\textcolor[rgb]{0.40,0.40,0.40}{#1}}
  \providecommand*\DUroledeleted[1]{\textcolor[rgb]{0.40,0.40,0.40}{#1}}
  \providecommand*\DUrolekeyword[1]{\textbf{#1}}
  \providecommand*\DUrolestring[1]{\textit{#1}}
  
Elements
--------

Definitions for unknown or to-be-configured Docutils elements
and roles (inline elements).

admonition::

  % admonition environment (specially marked topic)
  \ifx\DUadmonition\undefined % poor man's "provideenvironment"
   \newbox{\DUadmonitionbox}
   \newenvironment{DUadmonition}%
    {\begin{center}
       \begin{lrbox}{\DUadmonitionbox}
         \begin{minipage}{0.9\linewidth}
    }%
    {    \end{minipage}
       \end{lrbox}
       \fbox{\usebox{\DUadmonitionbox}}
     \end{center}
    }
  \fi
  
fieldlist::

  % field list environment (for separate configuration of `field lists`)
  \ifthenelse{\isundefined{\DUfieldlist}}{
    \newenvironment{DUfieldlist}%
      {\quote\description}
      {\enddescription\endquote}
  }{}
  
footnotes::

  % numerical or symbol footnotes with hyperlinks and backlinks
  \providecommand*{\DUfootnotemark}[3]{%
    \raisebox{1em}{\hypertarget{#1}{}}%
    \hyperlink{#2}{\textsuperscript{#3}}%
  }
  \providecommand{\DUfootnotetext}[4]{%
    \begingroup%
    \renewcommand{\thefootnote}{%
      \protect\raisebox{1em}{\protect\hypertarget{#1}{}}%
      \protect\hyperlink{#2}{#3}}%
    \footnotetext{#4}%
    \endgroup%
  }
  
inline::

  % custom inline roles: \DUrole{#1}{#2} tries \DUrole#1{#2}
  \providecommand*{\DUrole}[2]{%
    \ifcsname DUrole#1\endcsname%
      \csname DUrole#1\endcsname{#2}%
    \else%
      #2%
    \fi%
  }
  
legend::

  % legend environment (in figures and formal tables)
  \ifthenelse{\isundefined{\DUlegend}}{
    \newenvironment{DUlegend}{\small}{}
  }{}
  
lineblock::

  % line block environment
  \DUprovidelength{\DUlineblockindent}{2.5em}
  \ifthenelse{\isundefined{\DUlineblock}}{
    \newenvironment{DUlineblock}[1]{%
      \list{}{\setlength{\partopsep}{\parskip}
              \addtolength{\partopsep}{\baselineskip}
              \setlength{\topsep}{0pt}
              \setlength{\itemsep}{0.15\baselineskip}
              \setlength{\parsep}{0pt}
              \setlength{\leftmargin}{#1}}
      \raggedright
    }
    {\endlist}
  }{}
  
optionlist::

  % list of command line options
  \providecommand*{\DUoptionlistlabel}[1]{\bfseries #1 \hfill}
  \DUprovidelength{\DUoptionlistindent}{3cm}
  \ifthenelse{\isundefined{\DUoptionlist}}{
    \newenvironment{DUoptionlist}{%
      \list{}{\setlength{\labelwidth}{\DUoptionlistindent}
              \setlength{\rightmargin}{1cm}
              \setlength{\leftmargin}{\rightmargin}
              \addtolength{\leftmargin}{\labelwidth}
              \addtolength{\leftmargin}{\labelsep}
              \renewcommand{\makelabel}{\DUoptionlistlabel}}
    }
    {\endlist}
  }{}
  
rubric::

  % informal heading
  \providecommand*{\DUrubric}[1]{\subsubsection*{\emph{#1}}}
  
sidebar::

  % text outside the main text flow
  \providecommand{\DUsidebar}[1]{%
    \begin{center}
      \colorbox[gray]{0.80}{\parbox{0.9\linewidth}{#1}}
    \end{center}
  }
  
title::

  % title for topics, admonitions, unsupported section levels, and sidebar
  \providecommand*{\DUtitle}[1]{\subsubsection*{#1}}
  
subtitle::

  % subtitle (for sidebar)
  \providecommand*{\DUsubtitle}[1]{\par\emph{#1}\smallskip}
  
documentsubtitle::

  % subtitle (in document title)
  \providecommand*{\DUdocumentsubtitle}[1]{{\large #1}}
  
titlereference::

  % titlereference standard role
  \providecommand*{\DUroletitlereference}[1]{\textsl{#1}}
  
transition::

  % transition (break / fancybreak / anonymous section)
  \providecommand*{\DUtransition}{%
    \hspace*{\fill}\hrulefill\hspace*{\fill}
    \vskip 0.5\baselineskip
  }
  
References
==========

.. [Docutils] https://docutils.sourceforge.io/

.. _Docutils Document Tree: 
  https://docutils.sourceforge.io/docs/ref/doctree.html

.. _Docutils LaTeX Writer:
  https://docutils.sourceforge.io/docs/user/latex.html

.. _Configuration:
  https://docutils.sourceforge.io/docs/user/config.html

.. _"stylesheet":
   https://docutils.sourceforge.io/docs/user/config.html#stylesheet-latex-writers

.. _TDS: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=tds