Sphinx Fortran Domain

Fortran-lang's base Sphinx domain to document Fortran projects.

Status: This project is preparing its first official 0.1.x release. The core API is usable and tested; feedback and issue reports are welcome.

• Changelog: CHANGELOG.md

Install

For regular usage:

pip install sphinx-fortran-domain

For editable install for development:

pip install -e .

Build the docs

Install with documentation dependencies:

pip install -e ".[docs]"

Build HTML documentation:

cd docs
make html

Enable the extension

In conf.py:

extensions = [
	"sphinx_fortran_domain",
]

# Where your Fortran sources live (directories, files, or glob patterns)
fortran_sources = [
	"../src",        # directory
	"../example/*.f90",  # glob pattern
]

# Exclude sources from parsing (directories, files, or glob patterns)
fortran_sources_exclude = [
	"../example/legacy",          # directory
	"../example/skip_this.f90",   # file
	"../example/**/generated_*.f90",  # glob
]

# Select a lexer (built-in: "regex")
fortran_lexer = "regex"

# Doc comment convention 
# Examples: '!>' or '!!' or '!@'
fortran_doc_chars = [">", "!"]

Directives and roles

Manual declarations (create targets for cross-references):

.. f:function:: add_vectors(vec1, vec2)

.. f:subroutine:: normalize_vector(vec)

Autodoc-style views from parsed sources:

.. f:module:: example_module

.. f:submodule:: stdlib_quadrature_trapz

.. f:program:: test_program

Cross-references:

See :f:mod:`example_module` and :f:subr:`normalize_vector`.

Writing a lexer plugin

See the full step-by-step guide in the documentation: docs/api/lexers.rst.

External packages can register a lexer at import/setup time:

from sphinx_fortran_domain.lexers import register_lexer

def setup(app):
	register_lexer("my-lexer", lambda: MyLexer())

Then use fortran_lexer = "my-lexer".

Math in doc comments

This extension parses Fortran doc comments as reStructuredText fragments, so Sphinx roles/directives work inside docs (including math when sphinx.ext.mathjax is enabled).

Supported math styles:

• Recommended (reST):

!> .. math:: \hat{v} = \frac{\vec{v}}{|\vec{v}|}

Inline math also works via :math::

!> The magnitude is :math:`|\vec{v}| = \sqrt{x^2 + y^2 + z^2}`.

Community

• Contributing guide: CONTRIBUTING.md
• Code of conduct: CODE_OF_CONDUCT.md