Contributing to Mailspring

Thanks for checking out Mailspring! We'd love for you to contribute. Whether you're a first-time open source contributor or an experienced developer, there are ways you can help make Mailspring great:

Grab an issue tagged with Help Wanted and dig in! We try to add context to these issues when adding the label so you know where to get started in the codebase. Be wary of working on issues without the Help Wanted label - just because someone has created an issue doesn't mean we'll accept a pull request for it. See Where to Contribute below for more information.
Triage issues that haven't been addressed. With a large community of users on many platforms, we have trouble keeping up GitHub issues and moving the project forward at the same time. If you're good at testing and addressing issues, we'd love your help!

Filing an Issue

If you have a feature request or bug to report, please search for existing issues including closed ones!: https://github.com/Foundry376/Mailspring/issues?utf8=%E2%9C%93&q=is%3Aissue. If someone has already requested the feature you have in mind, upvote it using the "Add Reaction" feature - our team often sorts issues to find the most upvoted ones. For bugs, please verify that you're running the latest version of Mailspring. If you file an issue without providing detail, we may close it without comment.

Pull requests

The first time you submit a pull request, a bot will ask you to sign a standard, bare-bones Contributor License Agreement. The CLA states that you waive any patent or copyright claims you might have to the code you're contributing. (e.g.: you can't submit a PR and then sue Mailspring for using your code.)

Build and Run From Source

If you want to understand how Mailspring works or want to debug an issue, you'll want to get the source, build it, and run it locally.

Installing Prerequisites

You'll need git and a recent version of Node.JS (any v7.2.1+ is recommended with npm v3.10.10+). nvm is also highly recommended. Based on your platform, you'll also need:

Windows:

npm install --global --production windows-build-tools

OS X:

Python
Xcode and the Command Line Tools (Xcode -> Preferences -> Downloads), which will install gcc and the related toolchain containing make.

Linux:

Python v2.7
make
A proper C/C++11 compiler tool chain, for example GCC
Library dependencies:
- On Debian-based Linux: sudo apt-get install libx11-dev libxkbfile-dev
- On Red Hat-based Linux: sudo yum install libX11-devel.x86_64 libxkbfile-devel.x86_64 libsecret-1-dev.
- On Debian-based Linux: sudo apt-get install libsecret-1-dev.
- On Red Hat-based Linux: sudo yum install libsecret-devel.

After you have these tools installed, run the following commands to check out Mailspring,install dependencies, and launch the app:

git clone https://github.com/foundry376/mailspring
cd mailspring
npm install
npm start

Development Workflow

App Data

When you're running Mailspring with npm start, it runs with the --dev flag and user data is located in a Mailspring-dev folder alongside the regular settings folder:

Mac: ~/Library/Application Support/Mailspring-dev
Windows: C:\Users\<you>\AppData\Roaming\Mailspring-dev
Linux: ~/.config/Mailspring-dev/

Developer Tools

From Mailspring, you can open the Developer Tools from the menu: Menu > Developer > Toggle Developer Tools. Here are a few tips for getting started:

Errors and warnings will show in the console.
On the console, $m is a shorthand for mailspring-exports, and allows you to access global Stores and Model classes.
You don't need to stop and restart the development version of Mailspring after each change. You can just reload the window via CMD+R (CTRL+R on Windows, Linux).

Linting

We use prettier and eslint for linting our sources. You can run both of these by running npm run lint on the command line. Always do this before submitting a pull request to ensure the CI servers accept your code.

Documentation

Back in 2015 and 2016, the Nylas Mail team made a huge effort to document the codebase. The docs are still available on GitHub pages, and are still largely relevant to Mailspring development.

Discussion Etiquette

In order to keep the conversation clear and transparent, please limit discussion to English and keep things on topic with the issue. Be considerate to others and try to be courteous and professional at all times.

Where to Contribute

Check out the full issues list for a list of all potential areas for contributions. Note that just because an issue exists in the repository does not mean we will accept a contribution to the core mail client for it. There are several reasons we may not accepts a pull requests, like:

Maintainability - We're extremely wary of adding options and preferences for niche behaviors. Email is a wild west, and we can't afford to support every possible configuration. Our general rule is that the code complexity of adding a preference isn't worth it unless the user base is fairly evenly divided about the desired behavior. We don't want to end up with this!
User experience - We want to deliver a lightweight and smooth mail client, so UX and performance matter a lot. If you'd like to change or extend the UI, consider doing it in a plugin or theme.
Architectural - The team and/or feature owner needs to agree with any architectural impact a change may make. Things like new extension APIs must be discussed with and agreed upon by the feature owner. To improve the chances to get a pull request merged you should select an issue that is labelled with the help-wanted or bug labels. If the issue you want to work on is not labelled with help-wanted or bug, you can start a conversation with the issue owner asking whether an external contribution will be considered.

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