fmt

Parallel formatter for multiple languages: Deno (JS/TS/JSON/MD/CSS/HTML/YAML/etc), PostgreSQL, Go, Nix, Rust, and others.

Features

• Multi-language support: Formats JavaScript, TypeScript, JSON, Markdown, CSS, HTML, YAML, Nix, Go, SQL, and Rust files
• Parallel execution: Runs all formatters simultaneously for faster formatting
• Check mode: Verify formatting without modifying files (useful for CI/CD)
• Respects .gitignore: Automatically skips files ignored by git
• Nix packaging: Reproducible builds with all dependencies included

Installation

With Nix and flakes enabled:

nix run github:BridgerB/fmt

Or clone and run with Deno:

git clone https://github.com/BridgerB/fmt.git
cd fmt
deno run --allow-run --allow-read --allow-env main.ts

Usage

Format all files

nix run github:BridgerB/fmt
# or locally:
deno run --allow-run --allow-read --allow-env main.ts

Check formatting (without modifying files)

nix run github:BridgerB/fmt -- --check
# or locally:
deno run --allow-run --allow-read --allow-env main.ts --check

Help

nix run github:BridgerB/fmt -- --help

Supported Languages

• JavaScript, TypeScript, JSON, Markdown, CSS, HTML, YAML, etc.: via deno fmt
• Nix: via alejandra
• Go: via goimports/gofmt
• SQL: via pg_format
• Rust: via rustfmt/cargo fmt

Configuration

fmt automatically respects your .gitignore file. Any files or directories ignored by git will be skipped during formatting.

The .gitignore is searched for starting from the current directory and walking up the directory tree.

Nix Flake Apps

The flake provides several useful apps:

• nix run - Format files in the current directory
• nix run .#check - Check formatting without modifying files
• nix run .#type-check - Check TypeScript types without running

Development

Enter the development shell with all dependencies:

nix develop

This provides access to all formatters (deno, alejandra, go, gotools, pgformatter) and git.