🍲 Kettle::Drift

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I've summarized my thoughts in this blog post.

kettle-drift tracks repeated adjacent-line chunks that usually signal template drift or copy/paste corruption. When it is injected into a project by the kettle-jem plugin, the rake tasks default to the kettle-jem template surface and baseline, so they validate only template-managed files instead of the whole repository.

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Works with JRuby
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Works with MRI Ruby 4
Works with MRI Ruby 3
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Compatible with MRI Ruby 3.2.0+, and concordant releases of JRuby, and TruffleRuby. CI workflows and Appraisals are generated for MRI Ruby 3.2.0+. This test floor is configured by ruby.test_minimum in .kettle-jem.yml and may be higher than the gem's runtime compatibility floor when legacy Rubies are not practical for the current toolchain.

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Alternatively:

Install the gem and add to the application's Gemfile by executing:

bundle add kettle-drift

If bundler is not being used to manage dependencies, install the gem by executing:

gem install kettle-drift

The injected rake tasks and the standalone CLI expose the same three operating modes, but they differ in default scan scope:

Behavior notes:

For kettle-jem-managed repos, prefer the injected rake tasks:

bin/rake kettle:drift
bin/rake kettle:drift:update
bin/rake kettle:drift:check
bin/rake kettle:drift:force_update

Use the standalone CLI when you intentionally want a broader or explicitly configured scan:

kettle-drift
kettle-drift --update
kettle-drift --check
kettle-drift --force-update
kettle-drift --template-dir=template

See SECURITY.md.

If you need some ideas of where to help, you could work on adding more code coverage, or if it is already 💯 (see below) check issues or PRs, or use the gem and think about how it could be better.

We so if you make changes, remember to update it.

See CONTRIBUTING.md for more detailed instructions.

See CONTRIBUTING.md.

Everyone interacting with this project's codebases, issue trackers, chat rooms and mailing lists agrees to follow the .

Made with contributors-img.

Also see GitLab Contributors: https://gitlab.com/kettle-rb/kettle-drift/-/graphs/main

This library follows for its public API where practical. For most applications, prefer the Pessimistic Version Constraint with two digits of precision.

For example:

spec.add_dependency("kettle-drift", "~> 1.0")

Dropping support for a platform can be a breaking change for affected users. If a release changes supported platforms, it should be called out clearly in the changelog and versioned with that impact in mind.

To get a better understanding of how SemVer is intended to work over a project's lifetime, read this article from the creator of SemVer:

• "Major Version Numbers are Not Sacred"

See CHANGELOG.md for a list of releases.

The gem is available under the following license: AGPL-3.0-only. See LICENSE.md for details.

If none of the available licenses suit your use case, please contact us to discuss a custom commercial license.

See LICENSE.md for the official copyright notice.

• Copyright (c) 2026 Peter H. Boling

Maintainers have teeth and need to pay their dentists. After getting laid off in an RIF in March, and encountering difficulty finding a new one, I began spending most of my time building open source tools. I'm hoping to be able to pay for my kids' health insurance this month, so if you value the work I am doing, I need your support. Please consider sponsoring me or the project.

To join the community or get help 👇️ Join the Discord.

To say "thanks!" ☝️ Join the Discord or 👇️ send money.

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Thanks for RTFM. ☺️