ffmt

A fast, configurable Fortran formatter with support for Fypp, Doxygen, and OpenACC/OpenMP directives. Written in Rust. Installable via pip.

Documentation | Configuration | Changelog

Installation

pip install ffmt

Or via Cargo:

cargo install ffmt

Quick start

ffmt src/                        # format in-place
ffmt --check src/                # CI mode (exit 1 if changes needed)
ffmt --diff src/                 # show colored diff
ffmt -j 8 src/                   # parallel
cat file.fpp | ffmt -            # stdin/stdout

Features

Code -- indentation, whitespace normalization, keyword casing, named ends, line wrapping, operator modernization (.eq. -> ==), double-colon enforcement, trailing semicolon removal
Comments -- rewrapping, inline spacing (S102), !< alignment, !&/& ! cleanup, format suppression (! ffmt off/on)
Structure -- blank line management around openers/closers/#ifdef, declaration :: alignment, declaration/use compaction
Preprocessor -- Fypp (#:if, $:, @:), C preprocessor (#ifdef), OpenACC (!$acc), OpenMP (!$omp)
Opt-in -- multi-statement splitting, assignment alignment, & column alignment, use-statement reformatting

Most options accept true, false, or "preserve". See the configuration reference for all options.

Configuration

Create ffmt.toml or add [tool.ffmt] to pyproject.toml:

indent-width = 4
line-length = 132
keyword-case = "lower"
modernize-operators = true
enforce-double-colon = true

[whitespace]
relational = true
multdiv = false

CI

# GitHub Actions
- uses: sbryngelson/ffmt@latest
  with:
    args: "--check src/"

# pre-commit
repos:
  - repo: https://github.com/sbryngelson/ffmt
    rev: v0.4.3
    hooks:
      - id: ffmt

Other Fortran formatters

Formatter	Language	Status	Notes
fprettify	Python	Unmaintained	Free-form only. Fypp support.
findent	C	Active	Indentation and fixed/free conversion.
Codee Formatter	Proprietary	Active	Commercial. Tree-sitter based.
LFortran fmt	Rust	In development	AST-based.
Fortitude	Rust	Active	Linter with auto-fix.

License

MIT

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Release history Release notifications | RSS feed

This release

0.4.4

Jul 14, 2026

0.4.3

Jun 12, 2026

0.4.2

Jun 12, 2026

0.4.1

May 28, 2026

0.4.0

May 12, 2026

0.3.5

May 12, 2026

0.3.4

Mar 25, 2026

0.3.1

Mar 24, 2026

0.3.0

Mar 23, 2026

0.2.8

Mar 22, 2026

0.2.7

Mar 22, 2026

0.2.6

Mar 21, 2026

0.2.5

Mar 21, 2026

0.2.4

Mar 21, 2026

0.2.3

Mar 21, 2026

0.2.2

Mar 21, 2026

0.2.1

Mar 21, 2026

0.2.0

Mar 21, 2026

0.1.3

Mar 20, 2026

0.1.2

Mar 20, 2026

0.1.1

Mar 20, 2026

0.1.0

Mar 20, 2026

ffmt 0.4.4

ffmt

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