rubocop-hq/rubocop

RuboCop is a Ruby static code analyzer (a.k.a. linter) and code formatter. Out of the box it will enforce many of the guidelines outlined in the community Ruby Style Guide. Apart from reporting the problems discovered in your code, RuboCop can also automatically fix many of them for you.

RuboCop is extremely flexible and most aspects of its behavior can be tweaked via various configuration options.

Please consider financially supporting its ongoing development.

Installation
RuboCop’s installation is pretty standard:

$ gem install rubocop
If you’d rather install RuboCop using bundler, add a line for it in your Gemfile (but set the require option to false, as it is a standalone tool):

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 lock in your Gemfile:

gem ‘rubocop’, ‘~> 0.91.0’, require: false
Quickstart
Just type rubocop in a Ruby project’s folder and watch the magic happen.

$ cd my/cool/ruby/project
$ rubocop
Documentation
You can read a lot more about RuboCop in its official docs.

Compatibility
RuboCop supports the following Ruby implementations:

MRI 2.4+
JRuby 9.2+
See compatibility for further details.

Readme Badge
If you use RuboCop in your project, you can include one of these badges in your readme to let people know that your code is written following the community Ruby Style Guide.

Ruby Style Guide

Ruby Style Guide

Team
Here’s a list of RuboCop’s core developers:

Bozhidar Batsov (author & head maintainer)
Jonas Arvidsson
Yuji Nakayama (retired)
Evgeni Dzhelyov (retired)
Ted Johansson
Masataka Kuwabara
Koichi Ito
Maxim Krizhanovski
Benjamin Quorning
Marc-André Lafortune
Logo
RuboCop’s logo was created by Dimiter Petrov. You can find the logo in various formats here.

The logo is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Contributors
Here’s a list 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.

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 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 GitHub Sponsors, Patreon, PayPal and Open Collective.

Open Collective Backers
Support us with a monthly donation and help us continue our activities. [Become a backer]

Open Collective Sponsors
Become a sponsor and get your logo on our README on GitHub with a link to your site. [Become a sponsor]

Changelog
RuboCop’s changelog is available here.

Copyright
Copyright © 2012-2020 Bozhidar Batsov. See LICENSE.txt for further details.