Contributing to Lutris ====================== IMPORTANT! If you contribute to Lutris on a somewhat regular basis, be sure to add yourself to the AUTHORS file! Finding features to work on --------------------------- If you are looking for issues to work on, have a look at the [milestones](https://github.com/lutris/lutris/milestones) and see which one is the closest to release then look at the tickets targeted at this release. Don't forget that Lutris is not only a desktop client, there are also a lot of issues to work on [on the website](https://github.com/lutris/website/issues) and also in the [build scripts repository](https://github.com/lutris/buildbot) where you can submit bash scripts for various open source games and engines we do not already have. Another area where users can help is [confirming some issues](https://github.com/lutris/lutris/issues?q=is%3Aissue+is%3Aopen+label%3A%22need+help%22) that can't be reproduced on the developers setup. Other issues, tagged [need help](https://github.com/lutris/lutris/issues?q=is%3Aissue+is%3Aopen+label%3A%22need+help%22) might be a bit more technical to resolve but you can always have a look and see if they fit your area of expertise. Note that Lutris is not a playground or a toy project. One cannot submit new features that aren't on the roadmap and submit a pull request for them without agreeing on a design first with the development team. Please get in touch with the developers before writing any code, so that you don't waste your efforts on something that isn't going to be merged. Make sure to post all the relevant information in a ticket or on the pull request. New features must at all times have a valid use case based on an actual game, be very specific about why you are implementing a feature otherwise it will get rejected. Avoid adding options in the GUI or introducing new installer directives for things that can be automated. Lutris focuses heavily on automation and on doing the right thing by default. Only introduce new option when absolutely necessary. Contributors are welcome to suggest architectural changes or better code design if they feel like the current implementation should be improved but please take note that we're trying to stay as lean as possible. Requests introducing complex architectural changes for the sake of "modularity", "Unix pureness" or subjective aspects might not be received warmly. There are no plans for any rewrite in another language or switching to another toolkit. Running Lutris from Git ----------------------- Running Lutris from a local git repository is easy, it only requires cloning the repository and executing Lutris from there. git clone https://github.com/lutris/lutris cd lutris ./bin/lutris -d Make sure you have all necessary dependencies installed. It is recommended that you keep a copy of the stable version installed with your package manager to ensure that all dependencies are available. If you are working on newly written code that might introduce new dependencies, check in the package configuration files for new packages to install. Debian based distros will have their dependencies listed in `debian/control` and RPM based ones in `lutris.spec`. The PyGOject introspection libraries are not regular python packages and it is not possible for pip to install them or use them from a virtualenv. Make sure to always use PyGOject from your distribution's package manager. Also install the necessary GObject bindings as described in the INSTALL file. Set up your development environment ----------------------------------- To ensure you have the proper dependencies installed run: `make dev` This will install all necessary python packages to get you up and running. This project includes .editorconfig so you're good to go if you're using any editor/IDE that supports this. Otherwise make sure to configure your max line length to 120, indent style to space and always end files with an empty new line. Formatting your code -------------------- To ensure getting your contributions getting merged faster and to avoid other developers from going back and fixing your code, please make sure your code passes style checks by running `make sc` and fixing any reported issues before submitting your code. This runs a series of tools to apply pep8 coding style conventions, sorting and grouping imports and checking for formatting issues and other code smells. You can help fix formatting issues or other code smells by having a look at the CodeFactor page: https://www.codefactor.io/repository/github/lutris/lutris When writing docstrings, you should follow the Google style (See: https://sphinxcontrib-napoleon.readthedocs.io/en/latest/example_google.html) You should always provide docstrings, otherwise your code wouldn't pass a Pylint check. Writing tests ------------- If your patch does not require interactions with a GUI or external processes, please consider adding unit tests for your code. Have a look at the existing test suite in the `tests` folder to see what kind of features are tested. Running tests ------------- Be sure to test your changes thoroughly, never submit changes without running the code. At the very least, run the test suite and check that nothing broke. You can run the test suite by typing `make test` in the source directory. In order to run the test, you'll need to install nose2 and flake8: pip3 install nose2 flake8 QAing your changes ------------------ It is very important that any of your changes be tested manually, especially if you didn't add unit tests for the patch. Even trivial changes should be tested as they could potentially introduce breaking changes from a simple oversight. Submitting your changes ----------------------- Make a new git branch based of `master` in most cases, or `next` if you want to target a future release. Send a pull request through GitHub describing what issue the patch solves. If the PR is related to and existing bug report, you can add `(Closes #nnn)` or `(Fixes #nnn)` to your PR title or message, where `nnn` is the ticket number you're fixing. If you have been fixing your PR with several commits, please consider squashing those commits into one with `git rebase -i`. Developer resources ------------------- Lutris uses Python 3 and GObject / Gtk+ 3 as its core stack, here are some links to some resources that can help you familiarize yourself with the project's code base. * [Python 3 documentation](https://docs.python.org/3/) * [PyGObject documentation](https://pygobject.readthedocs.io/en/latest/) * [Python Gtk 3 tutorial](https://python-gtk-3-tutorial.readthedocs.io/en/latest/objects.html) * [Fakegir GObject code completion](https://github.com/strycore/fakegir) Project structure ----------------- [root]-+ Config files and READMEs | +-[bin] Main lutris executable script +-[debian] Debian / Ubuntu packaging configuration +-[docs] User documentation +-[lutris]-+ Source folder | | | +-[gui] Gtk UI code | +-[installer] Install script interpreter | +-[migrations] Migration scripts for user side changes | +-[runners] Runner code, detailing launch options and settings | +-[services] External services (Steam, GOG, ...) | +-[util] Generic utilities | +-[po] Translation files +-[share] Lutris resources like icons, ui files, scripts +-[tests] Unit tests