Getting Started

Installation

Fatou runs on Linux, macOS, and Windows (x86_64 and arm64), and is available from several sources.

Install from crates.io with Cargo:

cargo install fatou

The fatou-cli package bundles a prebuilt binary:

npm install -g fatou-cli

Install the binary as a Python tool:

uv tool install fatou
# or
pipx install fatou

Download an archive for your platform from the releases page and put the fatou binary on your PATH.

Clone the repository and build a release binary:

git clone https://github.com/jolars/fatou
cd fatou
cargo build --release

The binary is written to target/release/fatou.

Format a file in place:

fatou format file.jl

Check formatting without writing changes (prints a diff, exits non-zero if any file would change):

fatou format --check file.jl

Lint a file (or pipe from stdin):

fatou lint --check file.jl

Run the language server over stdio (for editor integration):

fatou lsp

See the CLI Reference for the full set of commands and options, and Editor Setup to wire the language server into your editor.