Description:
Formatter for Haskell source code
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Type: Formula
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Tracked Since: Dec 28, 2025
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Links:
Homepage |
formulae.brew.sh
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Category: Developer tools
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Tags:
haskell
formatter
developer-tools
linter
code-style
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Install:
brew install fourmolu
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About:
Fourmolu is a configurable source code formatter for Haskell. It is a fork of Ormolu that introduces formatting options, allowing developers to customize the output style to match their project's conventions. This flexibility makes it easier to adopt in existing codebases with established style guides.
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Key Features:
- Highly configurable formatting options
- Preserves original AST structure
- Supports Haskell language extensions
- Integration with editor workflows
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Use Cases:
- Enforcing consistent code style across Haskell projects
- Automating code formatting in CI/CD pipelines
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Alternatives:
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Brittany
– Another configurable Haskell formatter, but uses a different approach to layout generation
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Ormolu
– The upstream project that Fourmolu is based on; strictly zero-configuration
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Stylish Haskell
– Focuses more on import sorting and simple alignment rather than full formatting
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