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<p align="center">
  <img src="https://raw.githubusercontent.com/bbatsov/rubocop/master/logo/rubo-logo-horizontal.png" alt="RuboCop Logo"/>
</p>

> Role models are important. <br/>
> -- Officer Alex J. Murphy / RoboCop

**RuboCop** is a Ruby static code analyzer. Out of the box it will
enforce many of the guidelines outlined in the community
[Ruby Style Guide](https://github.com/bbatsov/ruby-style-guide).

Most aspects of its behavior can be tweaked via various
[configuration options](https://github.com/bbatsov/rubocop/blob/master/config/default.yml).

Apart from reporting problems in your code, RuboCop can also
automatically fix some of the problems for you.

[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/bbatsov/rubocop?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)

**Please consider [supporting financially its ongoing development](#funding).**

## Installation

**RuboCop**'s installation is pretty standard:

```sh
$ gem install rubocop
```

If you'd rather install RuboCop using `bundler`, don't require it in your `Gemfile`:

```rb
gem 'rubocop', require: false
```

RuboCop's development is moving at a very rapid pace and there are
often backward-incompatible changes between minor releases (since we
haven't reached version 1.0 yet). To prevent an unwanted RuboCop update you
might want to use a conservative version locking in your `Gemfile`:

```rb
gem 'rubocop', '~> 0.50.0', require: false
```

## Quickstart

Just type `rubocop` in a Ruby project's folder and watch the magic happen.

```
$ cd my/cool/ruby/project
$ rubocop
```

## Official manual

You can read a ton more about RuboCop in its [official manual](http://rubocop.readthedocs.io).

## Compatibility

RuboCop supports the following Ruby implementations:

* MRI 2.0
* MRI 2.1
* MRI 2.2
* MRI 2.3
* MRI 2.4
* JRuby 9.0+
* Rubinius 2.0+

## Team

Here's a list of RuboCop's core developers:

* [Bozhidar Batsov](https://github.com/bbatsov)
* [Jonas Arvidsson](https://github.com/jonas054)
* [Yuji Nakayama](https://github.com/yujinakayama)
* [Evgeni Dzhelyov](https://github.com/edzhelyov) (retired)
* [Ted Johansson](https://github.com/drenmi)
* [Masataka Kuwabara](https://github.com/pocke)

## Logo

RuboCop's logo was created by [Dimiter Petrov](https://www.chadomoto.com/). You can find the logo in various
formats [here](https://github.com/bbatsov/rubocop/tree/master/logo).

The logo is licensed under a
[Creative Commons Attribution-NonCommercial 4.0 International License](http://creativecommons.org/licenses/by-nc/4.0/deed.en_GB).

## Contributors

Here's a [list](https://github.com/bbatsov/rubocop/graphs/contributors) of
all the people who have contributed to the development of RuboCop.

I'm extremely grateful to each and every one of them!

If you'd like to contribute to RuboCop, please take the time to go
through our short
[contribution guidelines](CONTRIBUTING.md).

Converting more of the Ruby Style Guide into RuboCop cops is our top
priority right now. Writing a new cop is a great way to dive into RuboCop!

Of course, bug reports and suggestions for improvements are always
welcome. GitHub pull requests are even better! :-)

## Funding

While RuboCop is free software and will always be, the project would benefit immensely from some funding.
Raising a monthly budget of a couple of thousand dollars would make it possible to pay people to work on
certain complex features, fund other development related stuff (e.g. hardware, conference trips) and so on.
Raising a monthly budget of over $5000 would open the possibility of someone working full-time on the project
which would speed up the pace of development significantly.

We welcome both individual and corporate sponsors! We also offer a
wide array of funding channels to account for your preferences
(although
currently [Open Collective](https://opencollective.com/rubocop) is our
preferred funding platform).

If you're working in a company that's making significant use of RuboCop we'd appreciate it if you suggest to your company
to become a RuboCop sponsor.

You can support the development of RuboCop via
[Salt](https://salt.bountysource.com/teams/rubocop),
[Gratipay](https://www.gratipay.com/rubocop) and [Open Collective](https://opencollective.com/rubocop).

[![Support via Gratipay](https://cdn.rawgit.com/gratipay/gratipay-badge/2.1.3/dist/gratipay.png)](https://gratipay.com/rubocop)

### Open Collective Backers

Support us with a monthly donation and help us continue our activities. [[Become a backer](https://opencollective.com/rubocop#backer)]

<a href="https://opencollective.com/rubocop/backer/0/website" target="_blank"><img src="https://opencollective.com/rubocop/backer/0/avatar.svg"></a>
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### Open Collective Sponsors

Become a sponsor and get your logo on our README on GitHub with a link to your site. [[Become a sponsor](https://opencollective.com/rubocop#sponsor)]

<a href="https://opencollective.com/rubocop/sponsor/0/website" target="_blank"><img src="https://opencollective.com/rubocop/sponsor/0/avatar.svg"></a>
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## Changelog

RuboCop's changelog is available [here](CHANGELOG.md).

## Copyright

Copyright (c) 2012-2017 Bozhidar Batsov. See [LICENSE.txt](LICENSE.txt) for
further details.
