nixpkgs-fmt

name	nixpkgs-fmt
description	Use this skill when the user wants to format Nix code, format nixpkgs expressions, or format NixOS configuration files.

nixpkgs-fmt Plugin

Nix code formatter for nixpkgs. Format Nix expressions and configurations according to nixpkgs style guidelines.

Commands

Nix Formatting

• nixpkgs-fmt nix format — Format Nix code

Utility

• nixpkgs-fmt _ _ — Passthrough to nixpkgs-fmt CLI

Usage Examples

• "Format Nix code"
• "Format nixpkgs expression"
• "Format NixOS config"
• "Check Nix formatting"

Installation

brew install nixpkgs-fmt

Or via Nix:

nix-env -iA nixpkgs.nixpkgs-fmt

Examples

# Format Nix file
nixpkgs-fmt nix format default.nix

# Check without modifying
nixpkgs-fmt nix format default.nix --check

# Write changes
nixpkgs-fmt nix format default.nix --write

# Verify formatting
nixpkgs-fmt nix format default.nix --verify

# Any nixpkgs-fmt command with passthrough
nixpkgs-fmt _ _ default.nix
nixpkgs-fmt _ _ default.nix --check

Key Features

• Nixpkgs - nixpkgs style guidelines
• Format - Nix code formatting
• Check - Check without changes
• Verify - Verify formatting
• Standard - Consistent style
• NixOS - NixOS configs
• Fast - Quick formatting
• Easy - Simple interface
• Maintainers - Package maintainers
• Reliable - Reliable output

Notes

• Great for Nix package maintainers
• Follows nixpkgs style guide
• Perfect for NixOS configs
• Pre-commit hook support