Installation

Weitere Installationsbefehle

macOS

Homebrewverifiziert · 100%

brew install fourmolu

local Homebrew formula metadata

Linux

Nixverifiziert · 92%

nix profile install nixpkgs#fourmolu

nixpkgs package indexes · pkgs/by-name/fo/fourmolu/package.nix · Quelle: api.github.com

Überblick

Paketzusammenfassung

Formatter for Haskell source code

Projektlinks

Befehle und Aliase

fourmolu

Verlauf

Projektgeschichte und Nutzung

Fourmolu is a formatter for Haskell source code. It is an Ormolu fork that keeps Ormolu's parser-driven, idempotent formatting goals while adding configurable style options through CLI flags and `fourmolu.yaml`.

Projektgeschichte

The repository was created in 2020 and describes itself as a fork of Ormolu with upstream improvements continually merged. The official README frames the project around one key departure from Ormolu: replacing the no-configuration style rule with configurable parameters.

The changelog shows a pattern of adding Fourmolu-specific configuration while also importing upstream Ormolu changes, including parser updates, formatting fixes, and support for new GHC language features.

Adoptionsgeschichte

Fourmolu is adopted by Haskell projects that want automatic formatting but need policy knobs that Ormolu intentionally avoids. The README documents installation through GHCup, Cabal, Stack, release notes, editor integration through Haskell Language Server, and CI through the recommended `run-fourmolu` GitHub Action.

Wie es verwendet wird

Users run `fourmolu Module.hs` to print formatted output, `fourmolu -i` to rewrite files, or `fourmolu --mode check` in CI. Configuration can be written in `fourmolu.yaml`, discovered from parent directories and the XDG config directory, or passed as command-line options.

Warum Paket-Nerds sich dafür interessieren

Fourmolu is a package-nerd case study in formatter governance. It forked an intentionally opinionated tool not to change the parser architecture, but to change the social contract around style configuration, while still tracking upstream Ormolu.

Zeitleiste

2020: The public `fourmolu/fourmolu` repository was created.
2023: v0.13.x and v0.14.x releases continued the configurable formatter line.
2024: v0.16.x added explicit configuration-file selection and upstream parser updates.
2025: v0.19.0.0 added options such as `haddock-location-signature` and `if-style`.
2026: v0.20.0.0 made Fourmolu installable with GHCup and added more import-grouping and record-style configuration.

Related projects

Fourmolu is directly related to Ormolu, GHC, ghc-lib-parser, Cabal, Stack, GHCup, Haskell Language Server, Hackage, and the `run-fourmolu` GitHub Action.

Quellen

Sicherheitslage

Risikostufe: grün

narrow executable package without higher-risk signals.

Risikoklassifikator

grün Risiko · niedrig Konfidenz · appliance

Warum

narrow executable package without higher-risk signals

Signale

metadata:no-higher-risk-signals

Installationsverhalten

In den Formelmetadaten ist kein Homebrew-Post-install-Hook erfasst.
Homebrew-Bottle-Metadaten sind für 6 Plattformziele verfügbar.
Installiert mit 1 Laufzeitabhängigkeiten.
Build-Metadaten listen 2 Build-Abhängigkeiten.

Empfohlene Prüfung

Prüfe vor unbeaufsichtigter Agent-Nutzung, ob das Tool Klartext-Credentials liest, Remote-Zustand schreibt, Artefakte veröffentlicht oder Plugins ausführt.

local files

Configuration and credential file locations

These source-backed paths show where this package keeps local settings or durable credentials. Automic Vault can use them as review targets for secret scanning, migration, and command approval.

Configuration files

Config paths the tool may read or write during local use.

Unix: fourmolu.yaml

Executables

Installierte Executables

Befehl	Art	Sichtbarkeit	Hinweis
`fourmolu`	cli	globales Executable

Aktualität

Version und Aktualität

Diese Signale trennen das Alter der Seitengenerierung, Aktivität des Paketmanagers und Upstream-Release-Vergleich. Versionsrückstand wird nur gemeldet, wenn eine Evidenz-URL und vergleichbare Versionen vorhanden sind.

Seite generiert2026-07-25

Manager-Version0.20.0.0

Manager aktualisiert2026-07-22

lokale DatenOK

Upstreamnot checked

neueste erkannte Versionnicht erkannt

https://fourmolu.github.io/

InfoRelease/tag comparison is only available for GitHub repositories.https://fourmolu.github.io/none Konfidenz

Installationsmetadaten

Paketmetadaten

Paketschlüssel	brew:fourmolu
Version	0.20.0.0
Paketmanager	Homebrew
Paketmanager-Seite	https://formulae.brew.sh/formula/fourmolu
Homepage	https://fourmolu.github.io/
Repository	https://github.com/fourmolu/fourmolu
Upstream-Dokumentation	https://fourmolu.github.io/
Lizenz	BSD-3-Clause
Quellarchiv	https://hackage.haskell.org/package/fourmolu-0.20.0.0/fourmolu-0.20.0.0.tar.gz
Zuletzt aktualisiert	2026-07-22T05:23:32Z
Pulse	updated
Abhängigkeiten	gmp
Build-Abhängigkeiten	cabal-install, ghc
Von macOS bereitgestellte Bibliotheken	libffi
Bottle	verfügbar (auf arm64_linux, arm64_sequoia, arm64_sonoma, arm64_tahoe, sonoma, x86_64_linux)
Homebrew post-install	nicht definiert
Dienst	keiner deklariert

Registry-Fakten

Details aus der Quelldatenbank

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

Source-Datenbank-Treffer

Andere Paketmanager-Einträge

Treffer stammen aus externen Paketmanager-Indizes und bleiben von lokalen Automic-Vault-Paketlinks getrennt.

Nix95%

fourmolu

nix profile install nixpkgs#fourmolu

normalized package name match
Abgeglichen nach: Fourmolu

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

Paketgraph

Links stammen aus dem lokalen Paketbeziehungsgraph, Ergänzungen, Abhängigkeitskanten, Ecosystem-Matches und Paket-Hub-Mitgliedschaft.

Quellspur

Aus Repository-Daten generiert

Diese Seite wird von av-web aus dem privaten Paket-SQLite-Artefakt bereitgestellt, das scripts/generate-pkg-sqlite.py erstellt.

Combined YAML source

View the package source record on GitHub.

combined/fourmolu.yml

Verwendete Quellen

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

fourmolu mit Homebrew, Nix installieren