Fatou

A language server, formatter, and linter for Julia that doesn't require running Julia itself. Fatou is written in Rust and is designed to be fast, safe, and easy to integrate into editors and tooling. It is named after the French mathematician Pierre Fatou, whose Fatou set is the complement of the Julia set.

Fatou follows the rust-analyzer design (a lossless rowan CST, salsa for incremental computation, and lsp-server for the language-server transport).

Installation

Fatou is available from several sources:

crates.io: cargo install fatou
npm: npm install -g fatou-cli (bundles a prebuilt binary)
PyPI: uv tool install fatou/pipx install fatou
Prebuilt binaries: from the releases page
VS Code/Open VSX: the Fatou extension (also works in Positron)

Runs on Linux, macOS, and Windows (x86_64 and arm64).

Usage

fatou parse <file.jl>          # print the CST (stdin if no file)
fatou format <file.jl>         # format to stdout (stdin if omitted)
fatou format --check <dir>     # check formatting; non-zero exit if any differ
fatou lint --check <dir>       # lint
fatou lsp                      # run the language server on stdio

Configuration lives in fatou.toml ([format] line_width/indent_width, [lint] select/ignore).

Editor integration

The language server (fatou lsp) provides formatting and parse diagnostics over stdio. The Fatou extension for VS Code/Open VSX (and Positron) bundles the binary and starts the server automatically; see editors/code. For Neovim and other editors, see the editor setup guide.

Development

cargo build
cargo test
cargo clippy --all-targets --all-features -- -D warnings
cargo fmt -- --check

Or via task: task test, task lint, task format.

License

MIT—see LICENSE.

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

fatou-0.5.0.tar.gz (289.3 kB view details)

Uploaded Jul 8, 2026 Source

Built Distributions

If you're not sure about the file name format, learn more about wheel file names.

The dropdown lists show the available interpreters, ABIs, and platforms. Enable javascript to be able to filter the list of wheel files.

fatou-0.5.0-py3-none-win_arm64.whl (2.1 MB view details)

Uploaded Jul 8, 2026 Python 3Windows ARM64

fatou-0.5.0-py3-none-win_amd64.whl (2.2 MB view details)

Uploaded Jul 8, 2026 Python 3Windows x86-64

fatou-0.5.0-py3-none-musllinux_1_2_x86_64.whl (2.4 MB view details)

Uploaded Jul 8, 2026 Python 3musllinux: musl 1.2+ x86-64

fatou-0.5.0-py3-none-musllinux_1_2_aarch64.whl (2.2 MB view details)

Uploaded Jul 8, 2026 Python 3musllinux: musl 1.2+ ARM64

fatou-0.5.0-py3-none-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (2.3 MB view details)

Uploaded Jul 8, 2026 Python 3manylinux: glibc 2.17+ x86-64

fatou-0.5.0-py3-none-manylinux_2_17_aarch64.manylinux2014_aarch64.whl (2.1 MB view details)

Uploaded Jul 8, 2026 Python 3manylinux: glibc 2.17+ ARM64

fatou-0.5.0-py3-none-macosx_11_0_arm64.whl (2.1 MB view details)

Uploaded Jul 8, 2026 Python 3macOS 11.0+ ARM64

fatou-0.5.0-py3-none-macosx_10_12_x86_64.whl (2.2 MB view details)

Uploaded Jul 8, 2026 Python 3macOS 10.12+ x86-64

File details

Details for the file fatou-0.5.0.tar.gz.

File metadata

Download URL: fatou-0.5.0.tar.gz
Upload date: Jul 8, 2026
Size: 289.3 kB
Tags: Source
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/6.1.0 CPython/3.13.12

File hashes

Hashes for fatou-0.5.0.tar.gz
Algorithm	Hash digest
SHA256	`076eeba897f8522983d66e98d5265e8ae24386118918ce4572a1c45c4cf9e366`
MD5	`47d5a7dc4bf3f4a1f8a74a1c126a4c46`
BLAKE2b-256	`a5f32d4e09e5ba9ce6c8696d10eedd6871381855b9af9cbb94f9e9f145cff09a`

See more details on using hashes here.

Provenance

The following attestation bundles were made for fatou-0.5.0.tar.gz:

Publisher: publish-pypi.yml on jolars/fatou

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: fatou-0.5.0.tar.gz
- Subject digest: 076eeba897f8522983d66e98d5265e8ae24386118918ce4572a1c45c4cf9e366
- Sigstore transparency entry: 2114452139
- Sigstore integration time: Jul 8, 2026
Source repository:
- Permalink: jolars/fatou@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Branch / Tag: refs/tags/v0.5.0
- Owner: https://github.com/jolars
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: publish-pypi.yml@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Trigger Event: push

File details

Details for the file fatou-0.5.0-py3-none-win_arm64.whl.

File metadata

Download URL: fatou-0.5.0-py3-none-win_arm64.whl
Upload date: Jul 8, 2026
Size: 2.1 MB
Tags: Python 3, Windows ARM64
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/6.1.0 CPython/3.13.12

File hashes

Hashes for fatou-0.5.0-py3-none-win_arm64.whl
Algorithm	Hash digest
SHA256	`f60cb1d9122c571ace223dabcb98f8871a005e9b13dc9aa5ea1582709033652e`
MD5	`7f655ca522f066926dad0c94bf665c2a`
BLAKE2b-256	`a8da2cdeaffce0a20ab17902fb9313bc19dc3abf31a906b1ebe5d2dd4ee38a7b`

See more details on using hashes here.

Provenance

The following attestation bundles were made for fatou-0.5.0-py3-none-win_arm64.whl:

Publisher: publish-pypi.yml on jolars/fatou

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: fatou-0.5.0-py3-none-win_arm64.whl
- Subject digest: f60cb1d9122c571ace223dabcb98f8871a005e9b13dc9aa5ea1582709033652e
- Sigstore transparency entry: 2114454446
- Sigstore integration time: Jul 8, 2026
Source repository:
- Permalink: jolars/fatou@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Branch / Tag: refs/tags/v0.5.0
- Owner: https://github.com/jolars
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: publish-pypi.yml@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Trigger Event: push

File details

Details for the file fatou-0.5.0-py3-none-win_amd64.whl.

File metadata

Download URL: fatou-0.5.0-py3-none-win_amd64.whl
Upload date: Jul 8, 2026
Size: 2.2 MB
Tags: Python 3, Windows x86-64
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/6.1.0 CPython/3.13.12

File hashes

Hashes for fatou-0.5.0-py3-none-win_amd64.whl
Algorithm	Hash digest
SHA256	`70a83d885d20016a0d963b5c3dab1fcc30979f1f97ae209dcc1061580356e319`
MD5	`b76f364a4148eeb0a22277f417a96169`
BLAKE2b-256	`f407f9fbf4290e95b5a4232b0ad1333cab20e01e7046e4f4e39357bc226f6c5e`

See more details on using hashes here.

Provenance

The following attestation bundles were made for fatou-0.5.0-py3-none-win_amd64.whl:

Publisher: publish-pypi.yml on jolars/fatou

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: fatou-0.5.0-py3-none-win_amd64.whl
- Subject digest: 70a83d885d20016a0d963b5c3dab1fcc30979f1f97ae209dcc1061580356e319
- Sigstore transparency entry: 2114454799
- Sigstore integration time: Jul 8, 2026
Source repository:
- Permalink: jolars/fatou@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Branch / Tag: refs/tags/v0.5.0
- Owner: https://github.com/jolars
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: publish-pypi.yml@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Trigger Event: push

File details

Details for the file fatou-0.5.0-py3-none-musllinux_1_2_x86_64.whl.

File metadata

Download URL: fatou-0.5.0-py3-none-musllinux_1_2_x86_64.whl
Upload date: Jul 8, 2026
Size: 2.4 MB
Tags: Python 3, musllinux: musl 1.2+ x86-64
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/6.1.0 CPython/3.13.12

File hashes

Hashes for fatou-0.5.0-py3-none-musllinux_1_2_x86_64.whl
Algorithm	Hash digest
SHA256	`463c2fb5e339ff0b96db7861cd0ae9e746e4cf9e34bb00006da134e451e4a44f`
MD5	`1ed9abe06ca7760833af7a68e78083b3`
BLAKE2b-256	`8932d27f6b322c8d01c07d9547f47fea616d77fb55583e6a76d27acd9bc494f0`

See more details on using hashes here.

Provenance

The following attestation bundles were made for fatou-0.5.0-py3-none-musllinux_1_2_x86_64.whl:

Publisher: publish-pypi.yml on jolars/fatou

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: fatou-0.5.0-py3-none-musllinux_1_2_x86_64.whl
- Subject digest: 463c2fb5e339ff0b96db7861cd0ae9e746e4cf9e34bb00006da134e451e4a44f
- Sigstore transparency entry: 2114453699
- Sigstore integration time: Jul 8, 2026
Source repository:
- Permalink: jolars/fatou@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Branch / Tag: refs/tags/v0.5.0
- Owner: https://github.com/jolars
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: publish-pypi.yml@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Trigger Event: push

File details

Details for the file fatou-0.5.0-py3-none-musllinux_1_2_aarch64.whl.

File metadata

Download URL: fatou-0.5.0-py3-none-musllinux_1_2_aarch64.whl
Upload date: Jul 8, 2026
Size: 2.2 MB
Tags: Python 3, musllinux: musl 1.2+ ARM64
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/6.1.0 CPython/3.13.12

File hashes

Hashes for fatou-0.5.0-py3-none-musllinux_1_2_aarch64.whl
Algorithm	Hash digest
SHA256	`0d6dece505deb54a081d74e2afde711a402cebcdc2ede7d54e1e8550ac9318a5`
MD5	`8f22cbe687ddc0a1b8ff624ccf8023cb`
BLAKE2b-256	`d4e959fde6168312c30d68400007289cb6b91986787166e09624ec0aa730b7bf`

See more details on using hashes here.

Provenance

The following attestation bundles were made for fatou-0.5.0-py3-none-musllinux_1_2_aarch64.whl:

Publisher: publish-pypi.yml on jolars/fatou

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: fatou-0.5.0-py3-none-musllinux_1_2_aarch64.whl
- Subject digest: 0d6dece505deb54a081d74e2afde711a402cebcdc2ede7d54e1e8550ac9318a5
- Sigstore transparency entry: 2114454692
- Sigstore integration time: Jul 8, 2026
Source repository:
- Permalink: jolars/fatou@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Branch / Tag: refs/tags/v0.5.0
- Owner: https://github.com/jolars
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: publish-pypi.yml@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Trigger Event: push

File details

Details for the file fatou-0.5.0-py3-none-manylinux_2_17_x86_64.manylinux2014_x86_64.whl.

File metadata

Download URL: fatou-0.5.0-py3-none-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Upload date: Jul 8, 2026
Size: 2.3 MB
Tags: Python 3, manylinux: glibc 2.17+ x86-64
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/6.1.0 CPython/3.13.12

File hashes

Hashes for fatou-0.5.0-py3-none-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Algorithm	Hash digest
SHA256	`dc5ccaa5765ff13ae01e9bd625fc621b7a85f8932d8c36a73a10bed08cb8493d`
MD5	`13e11bd9de0331dd4f6d278cba760ea8`
BLAKE2b-256	`b07248710626ecba445756d9bb6a1f1e2221cd84773c7d93b52a11866437cd7d`

See more details on using hashes here.

Provenance

The following attestation bundles were made for fatou-0.5.0-py3-none-manylinux_2_17_x86_64.manylinux2014_x86_64.whl:

Publisher: publish-pypi.yml on jolars/fatou

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: fatou-0.5.0-py3-none-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
- Subject digest: dc5ccaa5765ff13ae01e9bd625fc621b7a85f8932d8c36a73a10bed08cb8493d
- Sigstore transparency entry: 2114452996
- Sigstore integration time: Jul 8, 2026
Source repository:
- Permalink: jolars/fatou@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Branch / Tag: refs/tags/v0.5.0
- Owner: https://github.com/jolars
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: publish-pypi.yml@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Trigger Event: push

File details

Details for the file fatou-0.5.0-py3-none-manylinux_2_17_aarch64.manylinux2014_aarch64.whl.

File metadata

Download URL: fatou-0.5.0-py3-none-manylinux_2_17_aarch64.manylinux2014_aarch64.whl
Upload date: Jul 8, 2026
Size: 2.1 MB
Tags: Python 3, manylinux: glibc 2.17+ ARM64
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/6.1.0 CPython/3.13.12

File hashes

Hashes for fatou-0.5.0-py3-none-manylinux_2_17_aarch64.manylinux2014_aarch64.whl
Algorithm	Hash digest
SHA256	`75ed2ae4bac318ddcff1f9c91bc4011ab5a6444ea6feee4924963ff27b15967f`
MD5	`9f703ddd96cbb0573245ce878872e851`
BLAKE2b-256	`5dc4934c81170bb08d5226636fc3a7cef3fe51af8e339d69361e485dbe849196`

See more details on using hashes here.

Provenance

The following attestation bundles were made for fatou-0.5.0-py3-none-manylinux_2_17_aarch64.manylinux2014_aarch64.whl:

Publisher: publish-pypi.yml on jolars/fatou

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: fatou-0.5.0-py3-none-manylinux_2_17_aarch64.manylinux2014_aarch64.whl
- Subject digest: 75ed2ae4bac318ddcff1f9c91bc4011ab5a6444ea6feee4924963ff27b15967f
- Sigstore transparency entry: 2114454130
- Sigstore integration time: Jul 8, 2026
Source repository:
- Permalink: jolars/fatou@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Branch / Tag: refs/tags/v0.5.0
- Owner: https://github.com/jolars
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: publish-pypi.yml@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Trigger Event: push

File details

Details for the file fatou-0.5.0-py3-none-macosx_11_0_arm64.whl.

File metadata

Download URL: fatou-0.5.0-py3-none-macosx_11_0_arm64.whl
Upload date: Jul 8, 2026
Size: 2.1 MB
Tags: Python 3, macOS 11.0+ ARM64
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/6.1.0 CPython/3.13.12

File hashes

Hashes for fatou-0.5.0-py3-none-macosx_11_0_arm64.whl
Algorithm	Hash digest
SHA256	`a83778f43827949d7edcf3b7a73ffdd5f1e672679488bb195cd5cb5263ac0de3`
MD5	`280488accf47129499865e1a11c98127`
BLAKE2b-256	`c02b03c60d701dfd058bb2169c120905a407b7fcdfac28d335770578571de1fa`

See more details on using hashes here.

Provenance

The following attestation bundles were made for fatou-0.5.0-py3-none-macosx_11_0_arm64.whl:

Publisher: publish-pypi.yml on jolars/fatou

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: fatou-0.5.0-py3-none-macosx_11_0_arm64.whl
- Subject digest: a83778f43827949d7edcf3b7a73ffdd5f1e672679488bb195cd5cb5263ac0de3
- Sigstore transparency entry: 2114452369
- Sigstore integration time: Jul 8, 2026
Source repository:
- Permalink: jolars/fatou@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Branch / Tag: refs/tags/v0.5.0
- Owner: https://github.com/jolars
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: publish-pypi.yml@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Trigger Event: push

File details

Details for the file fatou-0.5.0-py3-none-macosx_10_12_x86_64.whl.

File metadata

Download URL: fatou-0.5.0-py3-none-macosx_10_12_x86_64.whl
Upload date: Jul 8, 2026
Size: 2.2 MB
Tags: Python 3, macOS 10.12+ x86-64
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/6.1.0 CPython/3.13.12

File hashes

Hashes for fatou-0.5.0-py3-none-macosx_10_12_x86_64.whl
Algorithm	Hash digest
SHA256	`10329043659a3c479816a87d439750bb40d6166fe7a5c7121f6f6e6328b25edb`
MD5	`07eaf2a6ef3f4f334f72ce59c4a7e40e`
BLAKE2b-256	`9caa8b3b2313b9dce34ca0e47b00dec5cd4032848c0d3a72e79c24baca1a9aa9`

See more details on using hashes here.

Provenance

The following attestation bundles were made for fatou-0.5.0-py3-none-macosx_10_12_x86_64.whl:

Publisher: publish-pypi.yml on jolars/fatou

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: fatou-0.5.0-py3-none-macosx_10_12_x86_64.whl
- Subject digest: 10329043659a3c479816a87d439750bb40d6166fe7a5c7121f6f6e6328b25edb
- Sigstore transparency entry: 2114452761
- Sigstore integration time: Jul 8, 2026
Source repository:
- Permalink: jolars/fatou@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Branch / Tag: refs/tags/v0.5.0
- Owner: https://github.com/jolars
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: publish-pypi.yml@7a043743e7f495ac2c8e6b31a15ce412e9dfd1aa
- Trigger Event: push

Release history Release notifications | RSS feed

0.15.0

Aug 17, 2026

0.14.0

Aug 13, 2026

0.13.0

Aug 10, 2026

0.12.0

Aug 8, 2026

0.11.1

Aug 7, 2026

0.11.0

Aug 7, 2026

0.10.0

Aug 3, 2026

0.9.0

Aug 1, 2026

0.8.0

Jul 30, 2026

0.7.0

Jul 25, 2026

0.6.0

Jul 20, 2026

This release

0.5.0

Jul 8, 2026

0.4.0

Jul 2, 2026

0.3.0

Jul 1, 2026

fatou 0.5.0

Fatou

Installation

Usage

Editor integration

Development

License

Project links

Key dates

1 maintainer

Credits

GitHub Statistics

License

Requires

Tags

Classifiers

Download files

Source Distribution

Built Distributions

File details

File metadata

File hashes

Provenance

File details

File metadata

File hashes

Provenance

File details

File metadata

File hashes

Provenance

File details

File metadata

File hashes

Provenance

File details

File metadata

File hashes

Provenance

File details

File metadata

File hashes

Provenance

File details

File metadata

File hashes

Provenance

File details

File metadata

File hashes

Provenance

File details

File metadata

File hashes

Provenance

Release history Release notifications | RSS feed