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Contributor agreement
Apple requires contributors to iOS projects to relicense their code on submit. We'll have to have individual contributors sign something to enable this.
Our volunteer legal have put together a form you can sign electronically. So no scanning, faxing, or carrier pigeons involved. How modern: https://whispersystems.org/cla/
Please go ahead and sign, putting your github username in "Address line #2", so that we can accept your pull requests at our heart's delight.
Code Conventions
We are trying to follow the GitHub code conventions for Objective-C and we appreciate that pull requests do conform with those conventions.
In addition to that, always add curly braces to your if conditionals, even if there is no else. Booleans should be declared according to their Objective-C definition, and hence take YES or NO as values.
One note, for programmers joining us from Java or similar language communities, note that exceptions are not commonly used for errors that may occur in normal use so familiarize yourself with NSError.
UI conventions
We prefer to use Storyboards vs. building UI elements within the code itself. We are not at the stage to provide a .strings localizable file for translating, but the goal is to have translatable strings in a single entry point so that we can reach users in their native language wherever possible.
Tabs vs Spaces
It's the eternal debate. We chose to adopt spaces. Please set your default Xcode configuration to 4 spaces for tabs, and 4 spaces for indentation (it's Xcode's default setting).
If you don't agree with us, you can use the ClangFormat Xcode plugin to code with your favorite indentation style!
BitHub
Open Whisper Systems is currently experimenting with the funding privacy Free and Open Source software. For example, this is the current Open WhisperSystems payout per commit, rendered dynamically as an image by the Open WhisperSystems BitHub instance:
Contributors
Signal wouldn’t be possible without the many open-source projects we depend on. Big shoutout to the maintainers of all the pods we use!