New ``graphviz`` extension to embed graphviz graphs.

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+.. highlight:: rest
+
+The Graphviz extension
+======================
+
+.. 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:
+
+
+.. 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 image.  In LaTeX output,
+   the code will be rendered to an embeddable PDF file.
+
+
+.. 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";
+
+
+.. 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";
+
+
+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` 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.