# Install fourmolu

Formatter for Haskell source code. Version 0.19.0.1 via Homebrew; verified from local package data.

## Install

```sh
sudo av install brew:fourmolu
```

Additional install commands:

### macOS

- Homebrew (100%):

```sh
brew install fourmolu
```

  Evidence: local Homebrew formula metadata

### Linux

- Nix (92%):

```sh
nix profile install nixpkgs#fourmolu
```

  Evidence: nixpkgs package indexes: pkgs/by-name/fo/fourmolu/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1

## Package Facts

- **Package key:** brew:fourmolu
- **Package manager:** Homebrew
- **Package manager URL:** <https://formulae.brew.sh/formula/fourmolu>
- **Version:** 0.19.0.1
- **Source summary:** Formatter for Haskell source code
- **Homepage:** <https://github.com/fourmolu/fourmolu>
- **Repository:** <https://github.com/fourmolu/fourmolu>
- **Upstream docs:** <https://fourmolu.github.io/>
- **License:** BSD-3-Clause
- **Source archive:** <https://hackage.haskell.org/package/fourmolu-0.19.0.1/fourmolu-0.19.0.1.tar.gz>
- **Generated:** 2026-06-10T07:18:26+00:00

## Executables

- fourmolu (cli)
- fourmolu (alias)

## Dependencies

- gmp

## Build Dependencies

- cabal-install
- ghc@9.12

## macOS Provided Libraries

- libffi

## Install Behavior

- Post-install hook: not defined
- Bottle: available on arm64_linux, arm64_sequoia, arm64_sonoma, arm64_tahoe, sonoma, x86_64_linux

## Freshness

- Page generated: 2026-06-10
- Package-manager version: 0.19.0.1
- Local data status: ok
- Upstream repository: https://github.com/fourmolu/fourmolu
- info: No package-manager update timestamp was available.
- info: No cached GitHub release or tag data was available.

## セキュリティノート

narrow executable package without higher-risk signals.

- **Geiger risk:** green / low
- narrow executable package without higher-risk signals

## Source Database Details

- **Source Database:** Homebrew formula API
- **Tap:** homebrew/core
- **Full Name:** fourmolu
- **Version Scheme:** 0
- **Revision:** 0
- **Head Version:** HEAD
- **Bottle Stable Root URL:** <https://ghcr.io/v2/homebrew/core>
- **Deprecated:** no
- **Disabled:** no
- **Keg Only:** no
- **URL Keys:** head, stable

## Other Package-Manager Records

- Nix - fourmolu: normalized package name match | nixpkgs package indexes: pkgs/by-name/fo/fourmolu/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1


## Related Links

- [Source-control packages](https://www.automicvault.com/ja/pkg/source-control-tools/) - Belongs to a source-control command family.
- [Terminal utility packages](https://www.automicvault.com/ja/pkg/terminal-utilities/) - Matched terminal and command-line workflow metadata.
- [Text processing packages](https://www.automicvault.com/ja/pkg/text-processing-tools/) - Matched text, document, or structured-data processing metadata.
- [Developer build packages](https://www.automicvault.com/ja/pkg/developer-build-tools/) - Matched build, compiler, generator, or developer workflow metadata.
- [cabal-install](https://www.automicvault.com/ja/pkg/brew/cabal-install/) - Build dependency declared by Homebrew.
- [ghc@9.12](https://www.automicvault.com/ja/pkg/brew/ghc-9-12/) - Build dependency declared by Homebrew.
- [fprettify](https://www.automicvault.com/ja/pkg/brew/fprettify/) - Shares av.db curated category or tags: cli, developer-tools, formatter, formatters, source-code.
- [dfmt](https://www.automicvault.com/ja/pkg/brew/dfmt/) - Shares av.db curated category or tags: cli, developer-tools, formatter, formatters, source-code.
- [stylish-haskell](https://www.automicvault.com/ja/pkg/brew/stylish-haskell/) - Shares av.db curated category or tags: cli, developer-tools, formatter, formatters, haskell.
- [fnlfmt](https://www.automicvault.com/ja/pkg/brew/fnlfmt/) - Shares av.db curated category or tags: cli, developer-tools, formatter, formatters, source-code.
- [shfmt](https://www.automicvault.com/ja/pkg/brew/shfmt/) - Shares av.db curated category or tags: cli, developer-tools, formatter, formatters.
- [stylua](https://www.automicvault.com/ja/pkg/brew/stylua/) - Shares av.db curated category or tags: cli, developer-tools, formatter, formatters.
- [buildifier](https://www.automicvault.com/ja/pkg/brew/buildifier/) - Shares av.db curated category or tags: cli, developer-tools, formatter, formatters.
- [gnu-indent](https://www.automicvault.com/ja/pkg/brew/gnu-indent/) - Shares av.db curated category or tags: cli, developer-tools, formatter, formatters.
- [hindent](https://www.automicvault.com/ja/pkg/brew/hindent/) - Both packages touch the same language runtime or ecosystem. Shared terms: cli, code, developer, developer-tools, formatter.
- [ormolu](https://www.automicvault.com/ja/pkg/brew/ormolu/) - Both packages touch the same language runtime or ecosystem. Shared terms: cli, code, developer, developer-tools, formatter.

## Sources

- Nucleus package database
- Geiger risk classifier
- package-page enrichment
- package version freshness
- av.db category and tag curation
- package relationship graph
- external package-manager database matches
- cross-ecosystem install command graph