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Codacy Rubocop

This is the docker engine we use at Codacy to have Rubocop support. You can also create a docker to integrate the tool and language of your choice! See the codacy-engine-scala-seed repository for more information.


You can create the docker by doing:

sbt docker:publishLocal

The docker is ran with the following command:

docker run -it -v $srcDir:/src  <DOCKER_NAME>:<DOCKER_VERSION>

Add plugin

Rubocop is moving some checks to separate repositories, as an example you can check

There are some important details to take into consideration:

  • Add dependency to Gemfile
  • Add it to src/main/ruby/rubocop_doc/generator.rb
- $plugins = ["rubocop-performance"]
+ $plugins = ["rubocop-performance", "rubocop-style"]
  • bundle install so the examples for the documentation are made available at vendor/bundle/ruby/{ruby_version}/gems/{plugin}/lib/rubocop/cop/*/*.rb
  • Adding the plugin to the $plugins will also make the script to require it, to be able to fetch Cops for the base documentation


We use the codacy-plugins-test to test our external tools integration. You can follow the instructions there to make sure your tool is working as expected.

Update Version with Docs

Change the version in .rubocop-version and then run on this project root:

bundle install --path vendor/bundle
bundle exec src/main/ruby/rubocop_doc/generator.rb
bundle exec src/main/ruby/codacy/rubocop/generator.rb
rm -f rubocop-doc.yml

Notes on the documentation generation:

  • You need to require the plugin, so they are injected on the registry when fetching the available Cops
  • After the bundle install the documentation generator will fetch examples from the Cops of the added plugins

What is Codacy?

Codacy is an Automated Code Review Tool that monitors your technical debt, helps you improve your code quality, teaches best practices to your developers, and helps you save time in Code Reviews.

Among Codacy’s features:

  • Identify new Static Analysis issues
  • Commit and Pull Request Analysis with GitHub, BitBucket/Stash, GitLab (and also direct git repositories)
  • Auto-comments on Commits and Pull Requests
  • Integrations with Slack, HipChat, Jira, YouTrack
  • Track issues in Code Style, Security, Error Proneness, Performance, Unused Code and other categories

Codacy also helps keep track of Code Coverage, Code Duplication, and Code Complexity.

Codacy supports PHP, Python, Ruby, Java, JavaScript, and Scala, among others.

Free for Open Source

Codacy is free for Open Source projects.

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