docs: contributing: use '.' rather than 'source' to align with 'installation'

See commit 855ba1f07aeb437483138d48d7929f0ff8c38b67 .

docs/contributing.rst

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 .. _contributing:
 
 =========================
 Contributing to Kallithea
 =========================
 
 Kallithea is developed and maintained by its users. Please join us and scratch
 your own itch.
 
 
 Infrastructure
 --------------
 
 The main repository is hosted on Our Own Kallithea (aka OOK) at
 https://kallithea-scm.org/repos/kallithea/, our self-hosted instance
 of Kallithea.
 
 For now, we use Bitbucket_ for `pull requests`_ and `issue tracking`_. The
 issue tracker is for tracking bugs, not for support, discussion, or ideas --
 please use the `mailing list`_ or :ref:`IRC <readme>` to reach the community.
 
 We use Weblate_ to translate the user interface messages into languages other
 than English. Join our project on `Hosted Weblate`_ to help us.
 To register, you can use your Bitbucket or GitHub account. See :ref:`translations`
 for more details.
 
 
 Getting started
 ---------------
 
 To get started with Kallithea development run the following commands in your
 bash shell::
 
         hg clone https://kallithea-scm.org/repos/kallithea
         cd kallithea
         python3 -m venv ../kallithea-venv
-        source ../kallithea-venv/bin/activate
+        . ../kallithea-venv/bin/activate
         pip install --upgrade pip setuptools
         pip install --upgrade -e . -r dev_requirements.txt python-ldap python-pam
         kallithea-cli config-create my.ini
         kallithea-cli db-create -c my.ini --user=user --email=[e-mail] --password=password --repos=/tmp
         kallithea-cli front-end-build
         gearbox serve -c my.ini --reload &
         firefox http://127.0.0.1:5000/
 
 If you plan to use Bitbucket_ for sending contributions, you can also fork
 Kallithea on Bitbucket_ first (https://bitbucket.org/conservancy/kallithea) and
 then replace the clone step above by a clone of your fork. In this case, please
 see :ref:`contributing-guidelines` below for configuring your fork correctly.
 
 
 Contribution flow
 -----------------
 
 Starting from an existing Kallithea clone, make sure it is up to date with the
 latest upstream changes::
 
         hg pull
         hg update
 
 Review the :ref:`contributing-guidelines` and :ref:`coding-guidelines`.
 
 If you are new to Mercurial, refer to Mercurial `Quick Start`_ and `Beginners
 Guide`_ on the Mercurial wiki.
 
 Now, make some changes and test them (see :ref:`contributing-tests`). Don't
 forget to add new tests to cover new functionality or bug fixes.
 
 For documentation changes, run ``make html`` from the ``docs`` directory to
 generate the HTML result, then review them in your browser.
 
 Before submitting any changes, run the cleanup script::
 
         ./scripts/run-all-cleanup
 
 When you are completely ready, you can send your changes to the community for
 review and inclusion. Most commonly used methods are sending patches to the
 mailing list (via ``hg email``) or by creating a pull request on Bitbucket_.
 
 .. _contributing-tests:
 
 
 Running tests
 -------------
 
 After finishing your changes make sure all tests pass cleanly. Run the testsuite
 by invoking ``py.test`` from the project root::
 
     py.test
 
 Note that on unix systems, the temporary directory (``/tmp`` or where
 ``$TMPDIR`` points) must allow executable files; Git hooks must be executable,
 and the test suite creates repositories in the temporary directory. Linux
 systems with /tmp mounted noexec will thus fail.
 
 Tests can be run on PostgreSQL like::
 
     sudo -u postgres createuser 'kallithea-test' --pwprompt  # password password
     sudo -u postgres createdb 'kallithea-test' --owner 'kallithea-test'
     REUSE_TEST_DB='postgresql://kallithea-test:password@localhost/kallithea-test' py.test
 
 Tests can be run on MariaDB/MySQL like::
 
     echo "GRANT ALL PRIVILEGES ON \`kallithea-test\`.* TO 'kallithea-test'@'localhost' IDENTIFIED BY 'password'" | sudo -u mysql mysql
     TEST_DB='mysql://kallithea-test:password@localhost/kallithea-test?charset=utf8mb4' py.test
 
 You can also use ``tox`` to run the tests with all supported Python versions.
 
 When running tests, Kallithea generates a `test.ini` based on template values
 in `kallithea/tests/conftest.py` and populates the SQLite database specified
 there.
 
 It is possible to avoid recreating the full test database on each invocation of
 the tests, thus eliminating the initial delay. To achieve this, run the tests as::
 
     gearbox serve -c /tmp/kallithea-test-XXX/test.ini --pid-file=test.pid --daemon
     KALLITHEA_WHOOSH_TEST_DISABLE=1 KALLITHEA_NO_TMP_PATH=1 py.test
     kill -9 $(cat test.pid)
 
 In these commands, the following variables are used::
 
     KALLITHEA_WHOOSH_TEST_DISABLE=1 - skip whoosh index building and tests
     KALLITHEA_NO_TMP_PATH=1 - disable new temp path for tests, used mostly for testing_vcs_operations
 
 You can run individual tests by specifying their path as argument to py.test.
 py.test also has many more options, see `py.test -h`. Some useful options
 are::
 
     -k EXPRESSION         only run tests which match the given substring
                           expression. An expression is a python evaluable
                           expression where all names are substring-matched
                           against test names and their parent classes. Example:
     -x, --exitfirst       exit instantly on first error or failed test.
     --lf                  rerun only the tests that failed at the last run (or
                           all if none failed)
     --ff                  run all tests but run the last failures first. This
                           may re-order tests and thus lead to repeated fixture
                           setup/teardown
     --pdb                 start the interactive Python debugger on errors.
     -s, --capture=no      don't capture stdout (any stdout output will be
                           printed immediately)
 
 Performance tests
 ^^^^^^^^^^^^^^^^^
 
 A number of performance tests are present in the test suite, but they are
 not run in a standard test run. These tests are useful to
 evaluate the impact of certain code changes with respect to performance.
 
 To run these tests::
 
     env TEST_PERFORMANCE=1 py.test kallithea/tests/performance
 
 To analyze performance, you could install pytest-profiling_, which enables the
 --profile and --profile-svg options to py.test.
 
 .. _pytest-profiling: https://github.com/manahl/pytest-plugins/tree/master/pytest-profiling
 
 .. _contributing-guidelines:
 
 
 Contribution guidelines
 -----------------------
 
 Kallithea is GPLv3 and we assume all contributions are made by the
 committer/contributor and under GPLv3 unless explicitly stated. We do care a
 lot about preservation of copyright and license information for existing code
 that is brought into the project.
 
 Contributions will be accepted in most formats -- such as pull requests on
 Bitbucket, something hosted on your own Kallithea instance, or patches sent by
 email to the `kallithea-general`_ mailing list.
 
 When contributing via Bitbucket, please make your fork of
 https://bitbucket.org/conservancy/kallithea/ `non-publishing`_ -- it is one of
 the settings on "Repository details" page. This ensures your commits are in
 "draft" phase and makes it easier for you to address feedback and for project
 maintainers to integrate your changes.
 
 .. _non-publishing: https://www.mercurial-scm.org/wiki/Phases#Publishing_Repository
 
 Make sure to test your changes both manually and with the automatic tests
 before posting.
 
 We care about quality and review and keeping a clean repository history. We
 might give feedback that requests polishing contributions until they are
 "perfect". We might also rebase and collapse and make minor adjustments to your
 changes when we apply them.
 
 We try to make sure we have consensus on the direction the project is taking.
 Everything non-sensitive should be discussed in public -- preferably on the
 mailing list.  We aim at having all non-trivial changes reviewed by at least
 one other core developer before pushing. Obvious non-controversial changes will
 be handled more casually.
 
 There is a main development branch ("default") which is generally stable so that
 it can be (and is) used in production. There is also a "stable" branch that is
 almost exclusively reserved for bug fixes or trivial changes. Experimental
 changes should live elsewhere (for example in a pull request) until they are
 ready.
 
 .. _coding-guidelines:
 
 
 Coding guidelines
 -----------------
 
 We don't have a formal coding/formatting standard. We are currently using a mix
 of Mercurial's (https://www.mercurial-scm.org/wiki/CodingStyle), pep8, and
 consistency with existing code. Run ``scripts/run-all-cleanup`` before
 committing to ensure some basic code formatting consistency.
 
 We support Python 3.6 and later.
 
 We try to support the most common modern web browsers. IE9 is still supported
 to the extent it is feasible, IE8 is not.
 
 We primarily support Linux and OS X on the server side but Windows should also work.
 
 HTML templates should use 2 spaces for indentation ... but be pragmatic. We
 should use templates cleverly and avoid duplication. We should use reasonable
 semantic markup with element classes and IDs that can be used for styling and testing.
 We should only use inline styles in places where it really is semantic (such as
 ``display: none``).
 
 JavaScript must use ``;`` between/after statements. Indentation 4 spaces. Inline
 multiline functions should be indented two levels -- one for the ``()`` and one for
 ``{}``.
 Variables holding jQuery objects should be named with a leading ``$``.
 
 Commit messages should have a leading short line summarizing the changes. For
 bug fixes, put ``(Issue #123)`` at the end of this line.
 
 Use American English grammar and spelling overall. Use `English title case`_ for
 page titles, button labels, headers, and 'labels' for fields in forms.
 
 .. _English title case: https://en.wikipedia.org/wiki/Capitalization#Title_case
 
 Template helpers (that is, everything in ``kallithea.lib.helpers``)
 should only be referenced from templates. If you need to call a
 helper from the Python code, consider moving the function somewhere
 else (e.g. to the model).
 
 Notes on the SQLAlchemy session
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 Each HTTP request runs inside an independent SQLAlchemy session (as well
 as in an independent database transaction). ``Session`` is the session manager
 and factory. ``Session()`` will create a new session on-demand or return the
 current session for the active thread. Many database operations are methods on
 such session instances. The session will generally be removed by
 TurboGears automatically.
 
 Database model objects
 (almost) always belong to a particular SQLAlchemy session, which means
 that SQLAlchemy will ensure that they're kept in sync with the database
 (but also means that they cannot be shared across requests).
 
 Objects can be added to the session using ``Session().add``, but this is
 rarely needed:
 
 * When creating a database object by calling the constructor directly,
   it must explicitly be added to the session.
 
 * When creating an object using a factory function (like
   ``create_repo``), the returned object has already (by convention)
   been added to the session, and should not be added again.
 
 * When getting an object from the session (via ``Session().query`` or
   any of the utility functions that look up objects in the database),
   it's already part of the session, and should not be added again.
   SQLAlchemy monitors attribute modifications automatically for all
   objects it knows about and syncs them to the database.
 
 SQLAlchemy also flushes changes to the database automatically; manually
 calling ``Session().flush`` is usually only necessary when the Python
 code needs the database to assign an "auto-increment" primary key ID to
 a freshly created model object (before flushing, the ID attribute will
 be ``None``).
 
 Debugging
 ^^^^^^^^^
 
 A good way to trace what Kallithea is doing is to keep an eye on the output on
 stdout/stderr of the server process. Perhaps change ``my.ini`` to log at
 ``DEBUG`` or ``INFO`` level, especially ``[logger_kallithea]``, but perhaps
 also other loggers. It is often easier to add additional ``log`` or ``print``
 statements than to use a Python debugger.
 
 Sometimes it is simpler to disable ``errorpage.enabled`` and perhaps also
 ``trace_errors.enable`` to expose raw errors instead of adding extra
 processing. Enabling ``debug`` can be helpful for showing and exploring
 tracebacks in the browser, but is also insecure and will add extra processing.
 
 TurboGears2 DebugBar
 ^^^^^^^^^^^^^^^^^^^^
 
 It is possible to enable the TurboGears2-provided DebugBar_, a toolbar overlayed
 over the Kallithea web interface, allowing you to see:
 
 * timing information of the current request, including profiling information
 * request data, including GET data, POST data, cookies, headers and environment
   variables
 * a list of executed database queries, including timing and result values
 
 DebugBar is only activated when ``debug = true`` is set in the configuration
 file. This is important, because the DebugBar toolbar will be visible for all
 users, and allow them to see information they should not be allowed to see. Like
 is anyway the case for ``debug = true``, do not use this in production!
 
 To enable DebugBar, install ``tgext.debugbar`` and ``kajiki`` (typically via
 ``pip``) and restart Kallithea (in debug mode).
 
 
 "Roadmap"
 ---------
 
 We do not have a road map but are waiting for your contributions. Refer to the
 wiki_ for some ideas of places we might want to go -- contributions in these
 areas are very welcome.
 
 
 Thank you for your contribution!
 --------------------------------
 
 
 .. _Weblate: http://weblate.org/
 .. _issue tracking: https://bitbucket.org/conservancy/kallithea/issues?status=new&status=open
 .. _pull requests: https://bitbucket.org/conservancy/kallithea/pull-requests
 .. _bitbucket: http://bitbucket.org/
 .. _mailing list: http://lists.sfconservancy.org/mailman/listinfo/kallithea-general
 .. _kallithea-general: http://lists.sfconservancy.org/mailman/listinfo/kallithea-general
 .. _Hosted Weblate: https://hosted.weblate.org/projects/kallithea/kallithea/
 .. _wiki: https://bitbucket.org/conservancy/kallithea/wiki/Home
 .. _DebugBar: https://github.com/TurboGears/tgext.debugbar
 .. _Quick Start: https://www.mercurial-scm.org/wiki/QuickStart
 .. _Beginners Guide: https://www.mercurial-scm.org/wiki/BeginnersGuides