Copied code from sphinx-doc/sphinx to extract graphviz for later patching.

Author: Paebbels

.gitignore

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+*.egg-info/
+*.pyc
+.*.swp
+.cache/
+.tox/
+__pycache__/
+doc/_build/

LICENSE.md

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+Copyright 2017-2019 Patrick Lehmann - Bötzingen, Germany  
+Copyright (c) 2007-2019 by the Sphinx team (see AUTHORS file).
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+* Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in the
+  documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

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-# sphinx.graphviz
-Modified variant of sphinx.ext.graphviz
+# btd.sphinx.graphviz
+
+This is a patched version of [`sphinx.ext.graphviz`](https://github.com/sphinx-doc/sphinx).
+
+--------------------
+
+## Added features
+
+* TBD
+
+--------------------
+SPDX-License-Identifier: BSD-2-Clause