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 |
@tweagio |
formulae.brew.sh
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Category: Developer tools
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Tags:
haskell
formatter
developer-tools
code-quality
ghc
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Install:
brew install ormolu
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About:
Ormolu is a command-line tool for formatting Haskell source code that aims to be consistent with the language's syntax and community style. It uses the GHC parser for accuracy and provides zero-configuration operation, making it easy to integrate into projects. Unlike other formatters, it preserves existing code structure where possible while ensuring consistent output.
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Key Features:
- Zero-configuration formatting with sensible defaults
- Uses GHC's own parser for 100% accurate Haskell parsing
- Idempotent output - running multiple times produces same result
- Supports both cabal and stack projects out of the box
- Detailed error messages for syntax issues
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Use Cases:
- Automated code formatting in CI/CD pipelines
- Standardizing code style across development teams
- Pre-commit hooks for maintaining consistent formatting
- Reformatting legacy Haskell codebases
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Alternatives:
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stylish-haskell
– More configurable but less consistent; uses regex-based parsing which can break on complex syntax
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hindent
– More opinionated about line breaks and indentation; less faithful to original code structure
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