ameba
A static code analysis tool for Crystal that enforces code style and catches code smells.
What is ameba?
Ameba is a static code analysis tool for the Crystal programming language. It analyzes Crystal source code to enforce coding style conventions, detect code smells, and identify problematic code constructions, helping developers maintain consistent and high-quality codebases.
Crystal developers and teams who want to maintain consistent code style and improve code quality in their projects through automated linting.
Developers choose Ameba because it provides a dedicated, feature-rich linter for Crystal with autocorrection capabilities, parallel execution for performance, and extensive configurability, filling a key tooling gap in the Crystal ecosystem.
Overview
A static code analysis tool for Crystal
Use Cases
Best For
- Enforcing Crystal coding style conventions across a codebase
- Automatically detecting and fixing code smells in Crystal projects
- Integrating linting into CI/CD pipelines for Crystal applications
- Maintaining code quality in large Crystal codebases
- Educating developers on Crystal best practices and idioms
- Performing automated code reviews for Crystal pull requests
Not Ideal For
- Polyglot projects using multiple programming languages, as Ameba is Crystal-only
- Teams that eschew automated style enforcement in favor of manual code reviews
- Environments where automatic source code modifications are prohibited due to compliance policies
- Prototype or one-off scripts where linting overhead slows down rapid iteration
Pros & Cons
Pros
Directly enforces Crystal's documented coding conventions, ensuring idiomatic code as per the language's style guide.
Supports a --fix flag to automatically correct issues marked as [Correctable], reducing manual refactoring effort.
Benchmarks show inspection time drops from 29.11 to 10.14 seconds with 8 workers, making it scalable for larger codebases.
Allows granular control via .ameba.yml files and inline directives (e.g., # ameba:disable), enabling project-specific rule tuning.
Works with Vim, Emacs, VSCode, and Sublime Text via plugins, providing real-time feedback during development.
Cons
Exclusively designed for Crystal, so it offers no value for projects using other languages, unlike multi-language linters.
Only rules marked as [Correctable] can be fixed automatically, leaving many style and lint issues for manual resolution.
Requires managing a .ameba.yml file for exclusions and rule tweaks, which can be cumbersome for teams new to YAML or linting tools.
Like many linters, it may flag subjective style preferences or benign patterns, necessitating rule adjustments to reduce noise.
Frequently Asked Questions
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