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Contributing guide.

Contributions are welcome, and they are greatly appreciated! Every little bit helps, and credit will always be given.

  1. Bug report
  2. Contributing workflow
  3. Coding guide
  4. Pre-commit validation
  5. Pylint usage
  6. Merge request acceptation process

Bug report

Any proven or suspected malfunction should be traced in a bug report, the latter being an issue in the cars-filter repository.

Don't hesitate to do so: It is best to open a bug report and quickly resolve it than to let a problem remains in the project. Notifying the potential bugs is the first way for contributing to a software.

In the problem description, be as accurate as possible. Include:

  • The procedure used to initialize the environment
  • The incriminated command line or python function
  • The content of the input and output configuration files

Contributing workflow

Any code modification requires a Merge Request. It is forbidden to push patches directly into master (this branch is protected).

It is recommended to open your Merge Request as soon as possible in order to inform the developers of your ongoing work. Please add WIP: before your Merge Request title if your work is in progress: This prevents an accidental merge and informs the other developers of the unfinished state of your work.

The Merge Request shall have a short description of the proposed changes. If it is relative to an issue, you can signal it by adding Closes xx where xx is the reference number of the issue.

Likewise, if you work on a branch (which is recommended), prefix the branch's name by xx- in order to link it to the xx issue.

Classical workflow is :

  • Check Licence and sign Contributor Licence Agrement (Individual or Corporate)
  • Create an issue (or begin from an existing one)
  • Create a Merge Request from the issue: a MR is created accordingly with "WIP:", "Closes xx" and associated "xx-name-issue" branch
  • Hack code from a local working directory or from the forge (less possibilities)
  • Git add, commit and push from local working clone directory or from the forge directly
  • Install pre-commit validation process (using black, isort, flake8 and pylint) and check errors
  • Follow Conventional commits specifications for commit messages
  • Launch the test on your modifications.
  • When finished, change your Merge Request name (erase "WIP:" in title ) and ask to review the code (see below Merge request acceptation process)

Contribution license agreement

cars-filter requires that contributors sign out a Contributor License Agreement. The purpose of this CLA is to ensure that the project has the necessary ownership or grants of rights over all contributions to allow them to distribute under the chosen license (Apache License Version 2.0)

To accept your contribution, we need you to complete, sign and email to cars [at] cnes [dot] fr an Individual Contributor Licensing Agreement (ICLA) form and a Corporate Contributor Licensing Agreement (CCLA) form if you are contributing on behalf of your company or another entity which retains copyright for your contribution.

The copyright owner (or owner's agent) must be mentioned in headers of all modified source files and also added to the AUTHORS file.

Coding guide

Here are some rules to apply when developing a new functionality:

  • Include a comments ratio high enough and use explicit variables names. A comment by code block of several lines is necessary to explain a new functionality.
  • The usage of the print() function is forbidden: use the logging python standard module instead.
  • If possible, limit the use of classes as much as possible and opt for a functional approach. The classes are reserved for data modelling if it is impossible to do so using xarray.
  • Each new functionality shall have a corresponding test in its module's test file. This test shall, if possible, check the function's outputs and the corresponding degraded cases.
  • All functions shall be documented (object, parameters, return values).
  • Factorize the code as much as possible. The command line tools shall only include the main workflow and rely on the python modules.
  • If major modifications of the user interface or of the tool's behaviour are done, update the user documentation (and the notebooks if necessary).
  • Do not add new dependencies unless it is absolutely necessary, and only if it has a permissive license.
  • Use the type hints provided by the typing python module.
  • Correct project quality code errors (see below) : isort, black, flake8, pylint
  • The line length is 80

Pre-commit validation

A Pylint pre-commit validation is installed in Continuous Integration. Here is the way to install it:

pre-commit install

This installs the pre-commit hook in .git/hooks/pre-commit and .git/hooks/pre-push from .pre-commit-config.yaml file configuration. The pre-commit checks different validation process: isort

It is possible to test pre-commit before commiting:
* pre-commit run --all-files                      # Run all hooks on all files
* pre-commit run --files __init__.py   # Run all hooks on one file
* pre-commit run pylint                           # Run only pylint hook

Isort

Isort checks python imports validity in source code. The configuration is in isort section pyproject.toml file. It is configured with black profile.

Black

Black is the uncompromising Python code formatter. The configuration is in a black section in pyproject.toml file. The default configuration is used.

Flake8

Flake8 is a wrapper around PyFlakes, pycodestyle, Ned Batchelder’s McCabe script. The configuration is put in a flake8 section in setup.cfg

flake8-copyright is installed to check copyright in added file. Flake8 messages can be avoided (if necessary !) adding "# noqa error-number"

flake8-bugbear adds several rules to flake8

flake8-comprehensions is set for checking dict, set, list structures usage.

Pylint

pylint is well known global rules checker, complementary with flake8. The configuration is set in .pylintrc file. It is possible to run only pylint tool to check code modifications:

* cd HOME
* pylint                                  # Run all pylint tests
* pylint --list-msgs                      # Get pylint detailed errors informations

Pylint messages can be avoided (in particular cases !) adding "#pylint: disable=error-message-name" in the file or line. Look at examples in code.

Merge request acceptation process

The Merge Request will be merged into master after being reviewed by CARS steering committee (core committers) composed of:

  • David Youssefi (CNES)
  • Pierre Lassalle (CNES)
  • Emmanuelle Sarrazin (CNES)
  • Emmanuel Dubois (CNES)

Only the members of this committee can merge into master.