Fixit is a configurable Python linting framework built on LibCST. It is designed for developers who need to enforce coding standards that go beyond the rules provided by conventional Python linters.
The application uses concrete syntax trees, preserving the structure and formatting information needed to analyse and modify source code safely. Developers can create custom checks for undesirable patterns, project-specific conventions or opportunities to modernise existing code.
Fixit can attach suggested changes to detected violations, allowing developers to review or automatically apply corrections. Its configuration system is particularly valuable in larger repositories, where different packages may have different requirements and coding conventions. The framework therefore serves both as a linter and as a foundation for building automated code improvement tools.
This is free and open source software.
Key Features
- Uses LibCST to analyse Python source while preserving formatting and syntax information.
- Supports custom lint rules defined locally within individual projects.
- Allows rules to propose automatic code transformations alongside diagnostic messages.
- Provides hierarchical configuration so different directories can enable or disable different rules.
- Supports externally supplied rule packages and project-specific rule collections.
- Offers command-line commands for analysing source files and applying supported fixes.
- Provides pre-commit integration for checking changes before they are committed.
- Includes Language Server Protocol support for presenting diagnostics and suggested corrections in compatible editors.
Website: github.com/Instagram/Fixit
Support:
Developer: Facebook, Inc. and its affiliates
License: MIT License
Fixit is written in Python. Learn Python with our recommended free books and free tutorials.
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