# Installer alejandra avec Homebrew, Nix

Consultez les chemins d'installation, exécutables, métadonnées et notes de sécurité de alejandra pour les workflows d'agents IA.

## installation

```sh
sudo av install brew:alejandra
```

Commandes d'installation supplémentaires:

### macOS

- Homebrew (100%):

```sh
brew install alejandra
```

  Preuve: local Homebrew formula metadata

### Linux

- Nix (92%):

```sh
nix profile install nixpkgs#alejandra
```

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

## Faits du paquet

- **Clé du paquet:** brew:alejandra
- **Gestionnaire de paquets:** Homebrew
- **Version:** 4.0.0
- **Résumé source:** Command-line tool for formatting Nix Code
- **Page d'accueil:** <https://kamadorueda.com/alejandra/>
- **Dépôt:** <https://github.com/kamadorueda/alejandra>
- **Généré:** 2026-08-03T19:37:03+00:00

## exécutables

- alejandra (alias)

## Comportement d'installation

- Bouteille: non disponible

## Version et fraîcheur

- page générée: 2026-08-03
- version du gestionnaire: 4.0.0
## Historique du projet et usages

Alejandra is a Rust-based formatter for the Nix expression language. It is part of the Nix ecosystem's formatter wars: small, opinionated, fast, and built to make style disappear from code review.

### Historique du projet

The official README brands Alejandra as 'The Uncompromising Nix Code Formatter' and says it was written in Rust, formats Nixpkgs in seconds, and starts from the original Nixpkgs style refined by feedback from developers using Nix at scale.

The changelog shows a fast maturation arc in 2022. Version 1.0.0 shipped in March 2022; 1.4.0 and 1.5.0 followed with pre-commit support and dependency updates; 2.0.0 in July 2022 added a style guide, editor integration docs, and publication as a Rust crate with API docs; 3.0.0 in August 2022 simplified the CLI and improved large-file formatting order.

Later releases kept the formatter active in normal toolchain maintenance. Version 3.1.0 in 2024 refreshed integration docs and pre-commit hooks, and 4.0.0 in 2025 added experimental configurable indentation and support for newer Nix pipe operators.

### Historique d'adoption

Alejandra's official README documents installation from Nixpkgs, Nix flakes, NixOS configurations, Homebrew, and prebuilt binaries. The supplied package facts also list Homebrew and Nix packages, which fits its primary audience: people already managing tools declaratively.

The README lists integrations for VS Code, Vim, Neovim, GNU Emacs, Doom Emacs, pre-commit, and pre-commit-hooks.nix. That adoption history matters because formatters become useful only when they are cheap to run in editors, CI, and repository hooks.

### Modes d'utilisation

Users run `alejandra` against Nix files, stdin, or repository trees, and often wire it into editor format-on-save or pre-commit hooks. The project treats the CLI, formatting rules, flags, exit codes, and stdout as its public API under semantic versioning.

Configuration is intentionally limited. The README documents an experimental `alejandra.toml` discovered in the current working directory, or supplied explicitly with `--experimental-config`.

### Pourquoi les passionnés de paquets s'y intéressent

Alejandra is a package-nerd package because it formats the language used to describe packages in Nix. It is both a normal CLI package and a tool that shapes the readability of package expressions.

It also has the useful distribution trifecta for developer tools: Rust source, prebuilt binaries, and native Nix/Homebrew packaging, plus editor and hook integrations.

### Chronologie

- 2022-03-03: Alejandra 1.0.0 released.
- 2022-05-19: Alejandra 1.4.0 added a pre-commit hook.
- 2022-07-13: Alejandra 2.0.0 added a style guide, editor integration docs, and crates.io publication.
- 2022-08-14: Alejandra 3.0.0 simplified the CLI and improved large-file formatting order.
- 2024-11-03: Alejandra 3.1.0 refreshed docs and pre-commit integration.
- 2025-04-10: Alejandra 4.0.0 added configurable indentation and Nix pipe-operator support.

### Related projects

- The official README names NixEL, Santiago, and rnix-parser as related libraries.
- The README lists nixfmt, serokell/nixfmt, and nixpkgs-fmt as formatter alternatives in the same ecosystem.

### Sources

- <https://github.com/kamadorueda/alejandra/blob/main/CHANGELOG.md>
- <https://github.com/kamadorueda/alejandra/blob/main/README.md>
- <https://kamadorueda.com/alejandra>
- source_facts.package-manager


## Notes de sécurité

narrow executable package without higher-risk signals.

- **Risque Geiger:** vert / faible
- narrow executable package without higher-risk signals


## 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

- Unix: alejandra.toml
## Autres enregistrements de gestionnaires de paquets

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


## Combined YAML source

View the package source record on GitHub. [combined/alejandra.yml](https://github.com/mxcl/pkgdb/blob/main/combined/alejandra.yml)


## Sources

- pkg.so package database
- Geiger risk classifier
- curated configuration and credential file locations
- curated package history
- pkgdb category and tag curation
- external package-manager database matches
- cross-ecosystem install command graph