rubocop_plus

rubocop_plus is a Ruby gem that wraps around the rubocop gem. It makes changes and enhancements to rubocop by altering configuration and code. All configuration changes can be found in the config folder.

Disclaimer: rubocop_plus was built to store my preferred rubocop configuration and enhancements. There is no association with the base rubocop project. rubocop_plus was made public so it could be used by projects that I support, and to serve as a reference gem to anyone who wants to do something similar.

1. Releases are versioned using semver 2.0.0.
2. Ruby versions that reach EOL are removed in a major or minor release.

Ruby 3.1.0+ is supported.

Install rubocop_plus manually by executing:

$ gem install rubocop_plus

You can also add rubocop_plus to the :development group of your project's Gemfile:

group :development do
  gem 'rubocop_plus', require: false
end

If you add rubocop_plus to your Gemfile, it is recommended that you use require: false. There's no need to load rubocop_plus files when your project runs.

Keep in mind, if you place rubocop_plus in a project's Gemfile, it will lock your project to the version of rubocop_plus that gets written to the Gemfile.lock. If you're using a CI tool like Jenkins, this will likely make the CI tool use that same version - which is not always the desired outcome.

Next, remove the rubocop gem if it's listed in the Gemfile. rubocop_plus will install the version of rubocop that it needs.

Bundle the app:

$ bundle

Initialize your project's rubocop configuration:

$ rubo --init

This will create a .rubocop.yml inside the project root. By default, this file has configuration that tells rubocop to look in the rubocop_plus gem for custom RuboCop configuration. You can add additional configuration to this file if you would like to make other changes to RuboCop.

rubocop_plus provides a rubo command that you can use run to invoke rubocop in a standard manner. It will write all output to the rubocop/ folder inside the project. You can run rubo --help to see a list of commands. If rubocop_plus is included the project's Gemfile, rubo will execute the locked version. Otherwise, it will execute the latest version on the system.

The rubo command creates a rubocop/total-violations-count.txt file as part of the output. This file holds a single number that represents the total number of violations that were found by rubocop. This file was created so continuous integration tools like Jenkins could be configured to fail builds that have "too many" violations.

Checkout the repo, then cd into the project and run:

$ bin/setup

Run the test suite:

$ bin/start_rspec

Start an interactive prompt that will allow you to experiment (choose either):

$ bin/console  # for Pry
$ rake console # for IRB

The easiest way to develop with the gem locally is to cd into another ruby project that can serve as a test bed. From the sample project's root folder, execute /path/to/rubocop_plus/exe/rubo to execute the development version of rubocop_plus.

To release a new version, update the version number in version.rb, and then run rake release. This will create a git tag for the version, push git commits and tags, and push the gem to rubygems.org.

To run rubocop_plus on itself, cd to the root of the rubocop_plus development folder and run exe/rubo. If you just run rubo, you will invoke the rubo for the latest installed rubocop_plus gem and not the version of rubo within the development folder.

Contributions are welcome, but please be aware that rubocop_plus was created to serve the projects and teams that I directly support. Their needs and style preferences will come first. To contribute, create an issue on the GitHub Issue board and wait for feedback. Once the idea is approved, submit a Pull Request.

The gem is available as open source under the terms of the MIT License.