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Contributing

Welcome stranger!

If you have come here to learn how to contribute to mdBook, we have some tips for you!

First of all, don't hesitate to ask questions! Use the issue tracker, no question is too simple. If we don't respond in a couple of days, ping us @Michael-F-Bryan, @budziq, @steveklabnik, @frewsxcv it might just be that we forgot. 😉

Issues to work on

Any issue is up for the grabbing, but if you are starting out, you might be interested in the E-Easy issues. Those are issues that are considered more straightforward for beginners to Rust or the codebase itself. These issues can be a good launching pad for more involved issues. Easy tasks for a first time contribution include documentation improvements, new tests, examples, updating dependencies, etc.

If you come from a web development background, you might be interested in issues related to web technologies tagged A-JavaScript, A-Style, A-HTML or A-Mobile.

When you decide you want to work on a specific issue, ping us on that issue so that we can assign it to you. Again, do not hesitate to ask questions. We will gladly mentor anyone that want to tackle an issue.

Issues on the issue tracker are categorized with the following labels:

  • A-prefixed labels state which area of the project an issue relates to.
  • E-prefixed labels show an estimate of the experience necessary to fix the issue.
  • M-prefixed labels are meta-issues used for questions, discussions, or tracking issues
  • S-prefixed labels show the status of the issue
  • T-prefixed labels show the type of issue

Building mdBook

mdBook builds on stable Rust, if you want to build mdBook from source, here are the steps to follow:

  1. Navigate to the directory of your choice

  2. Clone this repository with git.

    git clone https://github.com/rust-lang/mdBook.git
    
  3. Navigate into the newly created mdBook directory

  4. Run cargo build

The resulting binary can be found in mdBook/target/debug/ under the name mdBook or mdBook.exe.

Code Quality

We love code quality and Rust has some excellent tools to assist you with contributions.

Formatting Code with rustfmt

Before you make your Pull Request to the project, please run it through the rustfmt utility. This will ensure we have good quality source code that is better for us all to maintain.

rustfmt has a lot more information on the project. The quick guide is

  1. Install it
    rustup component add rustfmt
    
  2. You can now run rustfmt on a single file simply by...
    rustfmt src/path/to/your/file.rs
    
    ... or you can format the entire project with
    cargo fmt
    
    When run through cargo it will format all bin and lib files in the current crate.

For more information, such as running it from your favourite editor, please see the rustfmt project. rustfmt

Finding Issues with Clippy

Clippy is a code analyser/linter detecting mistakes, and therfore helps to improve your code. Like formatting your code with rustfmt, running clippy regularly and before your Pull Request will help us maintain awesome code.

The best documentation can be found over at rust-clippy

  1. To install
    rustup component add clippy
    
  2. Running clippy
    cargo clippy
    

Clippy has an ever growing list of checks, that are managed in lint files.

Making a pull-request

When you feel comfortable that your changes could be integrated into mdBook, you can create a pull-request on GitHub. One of the core maintainers will then approve the changes or request some changes before it gets merged.

If you want to make your pull-request even better, you might want to run Clippy and rustfmt on the code first. This is not a requirement though and will never block a pull-request from being merged.

That's it, happy contributions! 🎉 🎉 🎉

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