Tests Clippy

Fortitude

A Fortran linter, inspired by (and built upon) Ruff. Written in Rust :crab: and installable with Python :snake:.

Shows a bar chart with benchmark results.

Linting 43 files from the GS2 repo.

:zap: Blazingly fast, up to hundreds of times faster than other open-source Fortran linters.
:wrench: Automatically fixes linter warnings.
:chart_with_upwards_trend: Over 100 rules, with many more planned.
:page_with_curl: Multiple output formats, including SARIF and GitHub/GitLab CI.
:handshake: Follows community best practices.
:muscle: Built on a robust tree-sitter parser.

Fortitude is developed by PlasmaFAIR, improving the sustainability of plasma science research software.

PlasmaFAIR logo

For more detail, please see our documentation.

Installation
Usage
Contributing
License

Installation

Fortitude is available as fortitude-lint on PyPI:

# With uv:
uv tool install fortitude-lint@latest

# With pip:
pip install fortitude-lint

Starting with version 0.7.0, Fortitude can be installed with our standalone installers:

# On macOS and Linux:
curl -LsSf https://github.com/PlasmaFAIR/fortitude/releases/latest/download/fortitude-installer.sh | sh

# On Windows:
powershell -c "irm https://github.com/PlasmaFAIR/fortitude/releases/latest/download/fortitude-installer.psi | iex"

It can also be installed as a pure Rust project:

git clone https://github.com/PlasmaFAIR/fortitude
cd fortitude
cargo install --path crates/fortitude

Fortitude can also be installed via other package managers

Usage

Fortitude can lint your whole project under the working directory using the check command:

fortitude check

You can also call check on individual files, globs, and directories. You can configure what extensions Fortitude searches for in directories with --file-extensions:

fortitude check --file-extensions=f90,fpp

Be default, Fortitude will ignore files and directories in your .gitignore. This can be disabled by setting --no-respect-gitignore. Additional excludes can be set using --extend-exclude:

# Don't check in the `benchmarks/` and `tests/` directories.
fortitude check --extend-exclude=benchmarks,tests

You can select or ignore individual rules or whole groups with --select and --ignore:

# Just check for missing `implicit none`
fortitude check --select=C001
# Also check for missing `implicit none` in interfaces
fortitude check --select=C001,C002
# Ignore all styling rules
fortitude check --ignore=S
# Only check for style rules, but ignore superfluous implicit none
fortitude check --select=S --ignore=S201
# Rules and categories can also be referred to by name
fortitude check --select=style --ignore=superfluous-implicit-none

Use --output-format=concise to get shorter output:

$ fortitude check --output-format=concise
test.f90:2:1: C111 function not contained within (sub)module or program
test.f90:5:1: S061 end statement should read 'end function double'
test.f90:7:1: C111 subroutine not contained within (sub)module or program
test.f90:8:3: C022 real has implicit kind

The explain command can be used to get extra information about any rules:

# Print extra information for all rules
fortitude explain
# Only get information for selected rules
fortitude explain C001 C011
# Print information on all style rules
fortitude explain S
# Rules and categories can also be referred to by name
fortitude explain obsolescent superfluous-implicit-none

Use --summary to get a brief overview:

# Overview of all rules
fortitude explain --summary
# Overview of all style rules
fortitude explain style --summary

To see further commands and optional arguments, try using --help:

fortitude --help
fortitude check --help

Fixes

Fortitude can automatically fix some lint warnings, such as unnecessary implicit none statements, missing double-colons in variable declarations, and more. Just pass the --fix flag to check:

$ fortitude check --fix
fortitude: 1 files scanned.
Number of errors: 2 (2 fixed, 0 remaining)

Run fortitude explain to see which rules have fixes available.

Preview

Some fortitude rules are only available through an opt-in preview mode to give the community some time to evaluate them and provide feedback. To enable preview rules, pass the --preview flag to check,

$ fortitude check --preview

or to enable more permanently, set it in your fpm.toml:

[extra.fortitude.check]
preview = true

or fortitude.toml:

[check]
preview = true

Run fortitude explain to see which rules are in preview mode.

Configuration

Fortitude will look for either a fortitude.toml, .fortitude.toml, fpm.toml, or pyproject.toml file in the current directory, or one of its parents. If using fortitude.toml or .fortitude.toml, settings should be under the command name:

[check]
select = ["C", "E", "S"]
ignore = ["S001", "S082"]
line-length = 132

For fpm.toml files, this has to be additionally nested under the extra.fortitude table:

[extra.fortitude.check]
select = ["C", "E", "S"]
ignore = ["S001", "S082"]
line-length = 132

while pyproject.toml uses tool.fortitude.

You can use --extend-select from the command line to select additional rules on top of those in the configuration file.

# Select correctness, error, style and obsolescent categories
fortitude check --extend-select=OB

A description of configuration options can be viewed using the config command:

# View all options under the 'check' heading
fortitude config check
# Get description of the 'extend-select' option
fortitude config check.extend-select

Editor Integration

Fortitude can be integrated into text editors and IDEs that support the Language Server Protocol (LSP), providing real-time diagnostics and code actions for applying fixes as you work.

Please see the documentation for details on setting this up for your editor.

We also have a VSCode plugin!.

pre-commit

Pre-commit hooks for Fortitude are available at fortitude-pre-commit.

Documentation

See table of rules for a list of all rules.

Contributing

Please feel free to add or suggest new rules and features! See CONTRIBUTING.md for a guide on contributing to the project. This also includes instructions for building the project from source, running tests, and linting/formatting the code. Please consult our code of conduct before contributing.

Projects Using Fortitude

More and more open-source Fortran projects are using Fortitude to help maintain their code, including:

Show Your Support

If you've found Fortitude useful in your project, please consider adding the Fortitude badge to your README.md:

[![Fortitude](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/PlasmaFAIR/fortitude/main/docs/assets/badge/v0.json)](https://github.com/PlasmaFAIR/fortitude)

or README.rst:

.. image:: https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/PlasmaFAIR/fortitude/main/docs/assets/badge/v0.json
    :target: https://github.com/PlasmaFAIR/fortitude
    :alt: Fortitude

or, as HTML:

<a href="https://github.com/PlasmaFAIR/fortitude"><img src="https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/PlasmaFAIR/fortitude/main/docs/assets/badge/v0.json" alt="Fortitude" style="max-width:100%;"></a>

License

This work is distributed under the MIT License. See LICENSE for more information.

Fortitude is inspired by, and uses parts from ruff, used under the MIT licence. See LICENSE for more information.

Development Status
- 2 - Pre-Alpha
Intended Audience
- Developers
License
- OSI Approved :: MIT License
Natural Language
- English
Operating System
- OS Independent
Programming Language
- Python
- Rust
Topic
- Software Development :: Quality Assurance

Download files

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

Source Distribution

fortitude_lint-0.9.2.tar.gz (308.8 kB view details)

Uploaded Jul 22, 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.

fortitude_lint-0.9.2-py3-none-win_arm64.whl (4.7 MB view details)

Uploaded Jul 22, 2026 Python 3Windows ARM64

fortitude_lint-0.9.2-py3-none-win_amd64.whl (5.0 MB view details)

Uploaded Jul 22, 2026 Python 3Windows x86-64

fortitude_lint-0.9.2-py3-none-win32.whl (4.4 MB view details)

Uploaded Jul 22, 2026 Python 3Windows x86

fortitude_lint-0.9.2-py3-none-musllinux_1_2_x86_64.whl (4.9 MB view details)

Uploaded Jul 22, 2026 Python 3musllinux: musl 1.2+ x86-64

fortitude_lint-0.9.2-py3-none-musllinux_1_2_i686.whl (4.9 MB view details)

Uploaded Jul 22, 2026 Python 3musllinux: musl 1.2+ i686

fortitude_lint-0.9.2-py3-none-musllinux_1_2_armv7l.whl (4.4 MB view details)

Uploaded Jul 22, 2026 Python 3musllinux: musl 1.2+ ARMv7l

fortitude_lint-0.9.2-py3-none-musllinux_1_2_aarch64.whl (4.6 MB view details)

Uploaded Jul 22, 2026 Python 3musllinux: musl 1.2+ ARM64

fortitude_lint-0.9.2-py3-none-manylinux_2_28_x86_64.whl (4.8 MB view details)

Uploaded Jul 22, 2026 Python 3manylinux: glibc 2.28+ x86-64

fortitude_lint-0.9.2-py3-none-manylinux_2_28_s390x.whl (4.8 MB view details)

Uploaded Jul 22, 2026 Python 3manylinux: glibc 2.28+ s390x

fortitude_lint-0.9.2-py3-none-manylinux_2_28_ppc64le.whl (5.4 MB view details)

Uploaded Jul 22, 2026 Python 3manylinux: glibc 2.28+ ppc64le

fortitude_lint-0.9.2-py3-none-manylinux_2_28_i686.whl (5.1 MB view details)

Uploaded Jul 22, 2026 Python 3manylinux: glibc 2.28+ i686

fortitude_lint-0.9.2-py3-none-manylinux_2_28_armv7l.whl (4.4 MB view details)

Uploaded Jul 22, 2026 Python 3manylinux: glibc 2.28+ ARMv7l

fortitude_lint-0.9.2-py3-none-manylinux_2_28_aarch64.whl (4.6 MB view details)

Uploaded Jul 22, 2026 Python 3manylinux: glibc 2.28+ ARM64

fortitude_lint-0.9.2-py3-none-macosx_11_0_arm64.whl (4.5 MB view details)

Uploaded Jul 22, 2026 Python 3macOS 11.0+ ARM64

fortitude_lint-0.9.2-py3-none-macosx_10_12_x86_64.whl (4.5 MB view details)

Uploaded Jul 22, 2026 Python 3macOS 10.12+ x86-64

File details

Details for the file fortitude_lint-0.9.2.tar.gz.

File metadata

Download URL: fortitude_lint-0.9.2.tar.gz
Upload date: Jul 22, 2026
Size: 308.8 kB
Tags: Source
Uploaded using Trusted Publishing? Yes
Uploaded via: uv/0.11.31 {"installer":{"name":"uv","version":"0.11.31","subcommand":["publish"]},"python":null,"implementation":{"name":null,"version":null},"distro":{"name":"Ubuntu","version":"24.04","id":"noble","libc":null},"system":{"name":null,"release":null},"cpu":null,"openssl_version":null,"setuptools_version":null,"rustc_version":null,"ci":true}

File hashes

Hashes for fortitude_lint-0.9.2.tar.gz
Algorithm	Hash digest
SHA256	`32e9c143042e2321453a7a6125fc725422e48dd27d5124ceb1e393b8e363226c`
MD5	`d66571d9b62ffc5f7de8f92e8a6e8877`
BLAKE2b-256	`ea692f576e88bbd9a007da0845497ebda24728f10ce126001a3f94672478c1ae`

Algorithm	Hash digest
SHA256	`636cadd801ea3056c98b146d653064bf1646cf40afd718b1e0f1879218ecc0ad`
MD5	`28e663e9a5a495143e1f9ba309db79bf`
BLAKE2b-256	`3dfa266eb07d79b14a620347b5c3fcb5c7c7142ea5a465bee5c60dbc6409c38d`

Algorithm	Hash digest
SHA256	`a86d260e95022fa180ee943d2660c530186f426bc05ff9adf93d8b0762ffcc2d`
MD5	`cd98297872fbcba46db465241d1a50da`
BLAKE2b-256	`d878e14e9d888839e5677f9351600a89c2b2e316edcd17b6ad2aa1306a5eb764`

Algorithm	Hash digest
SHA256	`381bfba3d4faf51e2d92a5ee3a5f1a246372d0c6de3c98282bae3ecd555f358c`
MD5	`43411c6ffe7ddb3150e811f56cc86a1b`
BLAKE2b-256	`65b0f7ca02c193a2d92dd53c0740fd03e1b5dcc0cccf18f92fad432082741137`

Algorithm	Hash digest
SHA256	`7caa4569511813e82724c3ec90632f417266dbd2f8e3754b2f3cf673a8bd0a52`
MD5	`6d411873cc994d2c2bda5d28211607c5`
BLAKE2b-256	`a1e1759ed83b63d64e25a95f2a16c7f673c6f2cd33e7dc57182a72309b8c811b`

Algorithm	Hash digest
SHA256	`0c9edc38c3fd182ff9e996565f2214eb66ea4862d1254faf667edf9a8ea1b17a`
MD5	`885b1894a21b2ae42963b1f15658ccde`
BLAKE2b-256	`1d50df73e166eeeec9744f7fd755fd958cf5067e79a2a628690c2c3fc2e20955`

Algorithm	Hash digest
SHA256	`d8b1afdba04d790f9fd79f890c7bdb4b40bd9d21ecd4fdad0d53120d646597b4`
MD5	`3c90a147673a3602382046de62ca56dd`
BLAKE2b-256	`34572e1f297fa0646f7accb18f7a3383655049090508e045e3c1fe4bffe02899`

Algorithm	Hash digest
SHA256	`1e3b37c00be100acd6b272a9c035ef31ffce33474904a266a89a31712bc26d57`
MD5	`3fc1ab74f9f241c28bcc32992a15b910`
BLAKE2b-256	`437db1739b2f87ed36cba79743aa877120447183bb8c703aa919092a0b6a9cc7`

Algorithm	Hash digest
SHA256	`0df0315357b647192b8385a7152e58f7c9df7c575c922612d9d3cd72d48f4358`
MD5	`73eb1f2fa9eb142b6c77dca51c0946ba`
BLAKE2b-256	`e9df8176dd965eae22e73938026284362225f19f5dcb01ad65ec8a4d810915e6`

Algorithm	Hash digest
SHA256	`75358f8afba8b93705a686ff6c009e29ad1ac2b23ffa294731eb21e2eb6fc046`
MD5	`c7298c2cca25a76de0bc3fcd9dd510e5`
BLAKE2b-256	`ab26be54e613f6e220e3478e05487d2258758f557d3dc98997b93d4ec1f4a663`

Algorithm	Hash digest
SHA256	`4bd88a675bfb1816d76009e726973266e4e7396e710ef7a6105595f3dcc2a3ce`
MD5	`3a2aaf5d12757cde6e2ede9c76f54733`
BLAKE2b-256	`c9eae6b812224fb79b4287a56b9313bb4043ae5b88c7ada5889e9281a30a8251`

Algorithm	Hash digest
SHA256	`57aed556da2a9e3cd0cfdbcd0f73ae3fe7b98020de90ef0cd6778f3af6e60585`
MD5	`74cca9b89813d9851a6b1288287fc924`
BLAKE2b-256	`bdf5240096f1e5fa20718316899f614c5f5195ab586e34a2aa24ed065d3a32d8`

Algorithm	Hash digest
SHA256	`7a9ae79b1aa5b1c9300def622e5b2fe88bfda42f654551b958a8048000a760d3`
MD5	`1c28c8f2fe8b5a12a47c267be770ce11`
BLAKE2b-256	`9f19af77ba17e013186c342481332e4490ed6c7fc021fdaca3211eb8c91e89ec`

Algorithm	Hash digest
SHA256	`eaf7e180495a7cab8e7153ba5fc7c0a293fa24f7c8eaaf15d6e0ee3ae07478f3`
MD5	`42029a448d25fe79a19e6b99e3feebac`
BLAKE2b-256	`585ea70b37bba0ebb14615aacc38a9446500b02c4de30bcbf70eb68a1d0d5a6e`

Algorithm	Hash digest
SHA256	`ebcbc0ed40078ab6f67f25573819a5df584556f6dd5d7d5b6852d89ac92f6320`
MD5	`0a922f41a8379798578c6cc58e9d00db`
BLAKE2b-256	`83486947f78b9b6c6dbbab08dec46b0402b517e59663d9b0cf4bedf42816666b`

Algorithm	Hash digest
SHA256	`dbe3f8c03a8fd254a456f1809b18d959233333d183edb5aab41a2e1044601aad`
MD5	`4a6ee2cda1961e1277a30b8b2d3ae601`
BLAKE2b-256	`0ec62f8e63c5afb808ed8c118ffe0eacc608c03271b3f66d62dedc361fd7dee7`

fortitude-lint 0.9.2

Fortitude

Table of Contents

Installation

Usage

Fixes

Preview

Configuration

Editor Integration

pre-commit

Documentation

Contributing

Projects Using Fortitude

Show Your Support

License

Project links

Key dates

2 maintainers

Credits

GitHub Statistics

License

Requires

Provides Extra

Tags

Classifiers

Download files

Source Distribution

Built Distributions

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

Release history Release notifications | RSS feed