rubocop

RuboCop is a static code analyzer and formatter for the Ruby programming language. It enforces Ruby style guidelines and common best practices through a collection of checks, known as cops, and is widely used to improve code quality and consistency across Ruby projects.

RuboCop analyzes source code by parsing it into an abstract syntax tree and running a configurable set of cops. The cops are grouped into categories such as Style, Layout, Metrics, Lint, Security, and framework-specific extensions like rubocop-rails or rubocop-rspec. Projects can enable, disable, or customize cops via a YAML configuration file typically named .rubocop.yml.

In addition to reporting offenses, RuboCop can automatically fix many issues with its auto-correct feature. The command line tool, invoked as rubocop, can scan directories, generate reports, and support various formats (plain text, JSON, HTML). It can be integrated into editors and continuous integration pipelines to enforce consistent style and code quality.

RuboCop is a Ruby gem maintained by a community of contributors, with initial development led by Bozhidar Batsov. It has a modular design that allows users to add or create custom cops and plugins to cover project-specific conventions. It is compatible with multiple Ruby versions and can be extended with plugins.

Overall, RuboCop serves as a standard tool in many Ruby projects for static analysis, style enforcement, and automated formatting, helping teams maintain readable and maintainable code.