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+Sphinx Developer's Guide
+========================
+
+.. topic:: Abstract
+
+   This document describes the development process of Sphinx, a documentation
+   system used by developers to document systems used by other developers to
+   develop other systems that may also be documented using Sphinx.
+
+The Sphinx source code is managed using `Mercurial`_ and is hosted on
+`BitBucket`_.
+
+    hg clone https://bitbucket.org/birkenfeld/sphinx
+
+.. rubric:: Community
+
+sphinx-users <sphinx-users@googlegroups.com>
+    Mailing list for user support.
+
+sphinx-dev <sphinx-dev@googlegroups.com>
+    Mailing list for development related discussions.
+
+#pocoo on irc.freenode.net
+    IRC channel for development questions and user support.
+
+    This channel is shared with other Pocoo projects.  Archived logs are
+    available `here <http://dev.pocoo.org/irclogs/>`_.
+
+.. _`BitBucket`: http://bitbucket.org
+.. _`Mercurial`: http://mercurial.selenic.com/
+
+
+Bug Reports and Feature Requests
+--------------------------------
+
+If you have encountered a problem with Sphinx or have an idea for a new
+feature, please submit it to the `issue tracker`_ on BitBucket or discuss it
+on the sphinx-dev mailing list.
+
+For bug reports, please include the output produced during the build process
+and also the log file Sphinx creates after it encounters an un-handled
+exception.  The location of this file should be shown towards the end of the
+error message.
+
+Including or providing a link to the source files involved may help us fix the
+issue.  If possible, try to create a minimal project that produces the error
+and post that instead.
+
+.. _`issue tracker`: http://bitbucket.org/birkenfeld/sphinx/issues
+
+
+Contributing to Sphinx
+----------------------
+
+The recommended way for new contributors to submit code to Sphinx is to fork
+the Mercurial repository on BitBucket and then submit a pull request after
+committing the changes.  The pull request will then need to be approved by one
+of the core developers before it is merged into the main repository.
+
+
+Getting Started
+~~~~~~~~~~~~~~~
+
+These are the basic steps needed to start developing on Sphinx.
+
+#. Create an account on BitBucket.
+
+#. Fork the main Sphinx repository (`birkenfeld/sphinx
+   <https://bitbucket.org/birkenfeld/sphinx>`_) using the BitBucket interface.
+
+#. Clone the forked repository to your machine. ::
+
+       hg clone https://bitbucket.org/USERNAME/sphinx-fork
+       cd sphinx-fork
+
+#. Checkout the appropriate branch.
+
+   For changes that should be included in the next minor release (namely bug
+   fixes), use the ``stable`` branch. ::
+
+       hg checkout stable
+
+   For new features or other substantial changes that should wait until the
+   next major release, use the ``default`` branch.
+
+#. Setup your Python environment. ::
+
+       virtualenv ~/sphinxenv
+       . ~/sphinxenv/bin/activate
+       pip install -e .
+
+#. Hack, hack, hack.
+
+   For tips on working with the code, see the `Coding Guide`_.
+
+#. Test, test, test.
+
+   Run the unit tests::
+
+       pip install nose
+       make test
+
+   Build the documentation and check the output for different builders::
+
+       cd docs
+       make clean html text man info latexpdf
+
+   Run the unit tests under different Python environments using
+   :program:`tox`::
+
+       pip install tox
+       tox -v
+
+   Add a new unit test in the ``tests`` directory if you can.
+
+   For bug fixes, first add a test that fails without your changes and passes
+   after they are applied.
+
+#. Commit your changes. ::
+
+       hg commit -m 'Add useful new feature that does this.'
+
+   BitBucket recognizes `certain phrases`__ that can be used to automatically
+   update the issue tracker.
+
+   For example::
+
+       hg commit -m 'Closes #42: Fix invalid markup in docstring of Foo.bar.'
+
+   would close issue #42.
+
+   __ https://confluence.atlassian.com/display/BITBUCKET/Automatically+Resolving+Issues+when+Users+Push+Code
+
+#. Push changes to your forked repository on BitBucket. ::
+
+       hg push
+
+#. Submit a pull request from your repository to ``birkenfeld/sphinx`` using
+   the BitBucket interface.
+
+#. Wait for a core developer to review your changes.
+
+
+Core Developers
+~~~~~~~~~~~~~~~
+
+The core developers of Sphinx have write access to the main repository.  They
+can commit changes, accept/reject pull requests, and manage items on the issue
+tracker.
+
+You do not need to be a core developer or have write access to be involved in
+the development of Sphinx.  You can submit patches or create pull requests
+from forked repositories and have a core developer add the changes for you.
+
+The following are some general guidelines for core developers:
+
+* Questionable or extensive changes should be submitted as a pull request
+  instead of being committed directly to the main repository.  The pull
+  request should be reviewed by another core developer before it is merged.
+
+* Trivial changes can be committed directly but be sure to keep the repository
+  in a good working state and that all tests pass before pushing your changes.
+
+* When committing code written by someone else, please attribute the original
+  author in the commit message and any relevant :file:`CHANGES` entry.
+
+* Using Mercurial named branches other than ``default`` and ``stable`` is not
+  encouraged.
+
+
+Coding Guide
+------------
+
+* Try to use the same code style as used in the rest of the project.  See the
+  `Pocoo Styleguide`__ for more information.
+
+  __ http://flask.pocoo.org/docs/styleguide/
+
+* For non-trivial changes, please update the :file:`CHANGES` file.  If your
+  changes alter existing behavior, please document this.
+
+* New features should be documented.  Include examples and use cases where
+  appropriate.  If possible, include a sample that is displayed in the
+  generated output.
+
+* When adding a new configuration variable, be sure to document it and update
+  :file:`sphinx/quickstart.py`.
+
+* Use the included :program:`utils/check_sources.py` script to check for
+  common formatting issues (trailing whitespace, lengthy lines, etc).
+
+* Add appropriate unit tests.
+
+
+Debugging Tips
+~~~~~~~~~~~~~~
+
+* Delete the build cache before building documents if you make changes in the
+  code by running the command ``make clean`` or using the
+  :option:`sphinx-build -E` option.
+
+* Use the :option:`sphinx-build -P` option to run Pdb on exceptions.
+
+* Use ``node.pformat()`` and ``node.asdom().toxml()`` to generate a printable
+  representation of the document structure.
+
+* Set the configuration variable :confval:`keep_warnings` to True so warnings
+  will be displayed in the generated output.
+
+* Set the configuration variable :confval:`nitpicky` to True so that Sphinx
+  will complain about references without a known target.
+
+* Set the debugging options in the `Docutils configuration file
+  <http://docutils.sourceforge.net/docs/user/config.html>`_.