.. highlight:: rest

:mod:`sphinx.ext.graphviz` -- Add Graphviz graphs
=================================================

.. module:: sphinx.ext.graphviz
   :synopsis: Support for Graphviz graphs.

.. versionadded:: 0.6

This extension allows you to embed `Graphviz <http://graphviz.org/>`_ graphs in
your documents.

It adds these directives:


.. rst:directive:: graphviz

   Directive to embed graphviz code.  The input code for ``dot`` is given as the
   content.  For example::

      .. graphviz::

         digraph foo {
            "bar" -> "baz";
         }

   In HTML output, the code will be rendered to a PNG or SVG image (see
   :confval:`graphviz_output_format`).  In LaTeX output, the code will be
   rendered to an embeddable PDF file.

   You can also embed external dot files, by giving the file name as an
   argument to :rst:dir:`graphviz` and no additional content::

      .. graphviz:: external.dot

   As for all file references in Sphinx, if the filename is absolute, it is
   taken as relative to the source directory.

   .. versionchanged:: 1.1
      Added support for external files.


.. rst:directive:: graph

   Directive for embedding a single undirected graph.  The name is given as a
   directive argument, the contents of the graph are the directive content.
   This is a convenience directive to generate ``graph <name> { <content> }``.

   For example::

      .. graph:: foo

         "bar" -- "baz";

   .. note:: The graph name is passed unchanged to Graphviz.  If it contains
      non-alphanumeric characters (e.g. a dash), you will have to double-quote
      it.


.. rst:directive:: digraph

   Directive for embedding a single directed graph.  The name is given as a
   directive argument, the contents of the graph are the directive content.
   This is a convenience directive to generate ``digraph <name> { <content> }``.

   For example::

      .. digraph:: foo

         "bar" -> "baz" -> "quux";


.. versionadded:: 1.0
   All three directives support an ``alt`` option that determines the image's
   alternate text for HTML output.  If not given, the alternate text defaults to
   the graphviz code.

.. versionadded:: 1.1
   All three directives support an ``inline`` flag that controls paragraph
   breaks in the output.  When set, the graph is inserted into the current
   paragraph.  If the flag is not given, paragraph breaks are introduced before
   and after the image (the default).

.. versionadded:: 1.1
   All three directives support a ``caption`` option that can be used to give a
   caption to the diagram.  Naturally, diagrams marked as "inline" cannot have a
   caption.

There are also these new config values:

.. confval:: graphviz_dot

   The command name with which to invoke ``dot``.  The default is ``'dot'``; you
   may need to set this to a full path if ``dot`` is not in the executable
   search path.

   Since this setting is not portable from system to system, it is normally not
   useful to set it in ``conf.py``; rather, giving it on the
   :program:`sphinx-build` command line via the :option:`-D <sphinx-build -D>`
   option should be preferable, like this::

      sphinx-build -b html -D graphviz_dot=C:\graphviz\bin\dot.exe . _build/html

.. confval:: graphviz_dot_args

   Additional command-line arguments to give to dot, as a list.  The default is
   an empty list.  This is the right place to set global graph, node or edge
   attributes via dot's ``-G``, ``-N`` and ``-E`` options.

.. confval:: graphviz_output_format

   The output format for Graphviz when building HTML files.  This must be either
   ``'png'`` or ``'svg'``; the default is ``'png'``. If ``'svg'`` is used, in
   order to make the URL links work properly, an appropriate ``target``
   attribute must be set, such as ``"_top"`` and ``"_blank"``. For example, the
   link in the following graph should work in the svg output: ::

       .. graphviz::

            digraph example {
                a [label="sphinx", href="http://sphinx-doc.org", target="_top"];
                b [label="other"];
                a -> b;
            }

   .. versionadded:: 1.0
      Previously, output always was PNG.
