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.

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

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``).

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