conf.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# MicroPython documentation build configuration file, created by
# sphinx-quickstart on Sun Sep 21 11:42:03 2014.
#
# This file is execfile()d with the current directory set to its
# containing dir.
#
# Note that not all possible configuration values are present in this
# autogenerated file.
#
# All configuration values have a default; values that are commented out
# serve to show the default.

# SPDX-FileCopyrightText: 2014 MicroPython & CircuitPython contributors (https://github.com/adafruit/circuitpython/graphs/contributors)
#
# SPDX-License-Identifier: MIT

import logging
import os
import re
import subprocess
import sys
import urllib.parse
import time
import pathlib
from collections import defaultdict

from sphinx.transforms import SphinxTransform
from docutils import nodes
from sphinx import addnodes
from sphinx.ext import intersphinx

# If extensions (or modules to document with autodoc) are in another directory,
# add these directories to sys.path here. If the directory is relative to the
# documentation root, use os.path.abspath to make it absolute, like shown here.
sys.path.insert(0, os.path.abspath("docs"))
sys.path.insert(0, os.path.abspath("."))

import shared_bindings_matrix

master_doc = "docs/index"

# Grab the JSON values to use while building the module support matrix
# in 'shared-bindings/index.rst'

# The stubs must be built before we calculate the shared bindings matrix
subprocess.check_output(["make", "stubs"])

# modules_support_matrix = shared_bindings_matrix.support_matrix_excluded_boards()
modules_support_matrix = shared_bindings_matrix.support_matrix_by_board()
modules_support_matrix_reverse = defaultdict(list)
for board, matrix_info in modules_support_matrix.items():
    for module in matrix_info["modules"]:
        modules_support_matrix_reverse[module].append(board)

modules_support_matrix_reverse = dict(
    (module, sorted(boards)) for module, boards in modules_support_matrix_reverse.items()
)

html_context = {
    "support_matrix": modules_support_matrix,
    "support_matrix_reverse": modules_support_matrix_reverse,
}

# -- General configuration ------------------------------------------------

# If your documentation needs a minimal Sphinx version, state it here.
needs_sphinx = "1.3"

# Add any Sphinx extension module names here, as strings. They can be
# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
# ones.
extensions = [
    "sphinx.ext.autodoc",
    "sphinx.ext.doctest",
    "sphinxcontrib.jquery",
    "sphinxcontrib.rsvgconverter",
    "sphinx.ext.intersphinx",
    "sphinx.ext.todo",
    "sphinx.ext.coverage",
    "sphinx_search.extension",
    "rstjinja",
    "myst_parser",
    "llms_txt",
]

# llms.txt: an index of every page for coding agents (docs/llms_txt.py)
llms_txt_description = (
    "Adafruit CircuitPython - Python for microcontrollers. "
    "Each page is also served as Markdown with the Accept: text/markdown header."
)
llms_txt_exclude = [
    "docs/porting",
    "docs/pdf",
    "shared-bindings/support_matrix",
]

# Add any paths that contain templates here, relative to this directory.
templates_path = ["templates", "docs/templates"]

# The suffix of source filenames.
source_suffix = {
    ".rst": "restructuredtext",
    ".md": "markdown",
}

extensions.append("autoapi.extension")

autoapi_type = "python"
# Uncomment this if debugging autoapi
autoapi_keep_files = True
autoapi_dirs = [
    os.path.join("circuitpython-stubs", x)
    for x in os.listdir("circuitpython-stubs")
    if os.path.exists(os.path.join("circuitpython-stubs", x, "__init__.pyi"))
]
print("autoapi_dirs", autoapi_dirs)
autoapi_add_toctree_entry = False
autoapi_options = [
    "members",
    "undoc-members",
    "private-members",
    "show-inheritance",
    "special-members",
    "show-module-summary",
]
autoapi_template_dir = "docs/autoapi/templates"
autoapi_python_class_content = "both"
autoapi_python_use_implicit_namespaces = True
autoapi_root = "shared-bindings"
autoapi_file_patterns = ["*.pyi"]

# Suppress cache warnings to prevent "unpickable" [sic] warning
# about autoapi_prepare_jinja_env() from sphinx >= 7.3.0.
# See https://github.com/sphinx-doc/sphinx/issues/12300
suppress_warnings = ["config.cache"]


def autoapi_prepare_jinja_env(jinja_env):
    jinja_env.globals["support_matrix_reverse"] = modules_support_matrix_reverse


redirects_file = "docs/redirects.txt"

# The encoding of source files.
# source_encoding = 'utf-8-sig'

# The master toctree document.
# master_doc = 'index'

# Get current date (execution) for copyright year
current_date = time.localtime()

# General information about the project.
project = "Adafruit CircuitPython"
copyright = f"2014-{current_date.tm_year}, MicroPython & CircuitPython contributors (https://github.com/adafruit/circuitpython/graphs/contributors)"

# These are overwritten on ReadTheDocs.
# The version info for the project you're documenting, acts as replacement for
# |version| and |release|, also used in various other places throughout the
# built documents.
#
# We don't follow "The short X.Y version" vs "The full version, including alpha/beta/rc tags"
# breakdown, so use the same version identifier for both to avoid confusion.

final_version = ""
git_describe = subprocess.run(
    ["python", "py/version.py"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, encoding="utf-8"
)
if git_describe.returncode == 0:
    git_version = re.search(
        r"^\d(?:\.\d){0,2}(?:\-(?:alpha|beta|rc)\.\d+){0,1}", str(git_describe.stdout)
    )
    if git_version:
        final_version = git_version[0]
else:
    print("Failed to retrieve git version:", git_describe.stdout)

version = release = final_version

# The language for content autogenerated by Sphinx. Refer to documentation
# for a list of supported languages.
# language = None

# There are two options for replacing |today|: either, you set today to some
# non-false value, then it is used:
# today = ''
# Else, today_fmt is used as the format for a strftime call.
# today_fmt = '%B %d, %Y'

# List of patterns, relative to source directory, that match files and
# directories to ignore when looking for source files.
include_patterns = [
    # Top directory documentation
    "*.rst",
    "*.md",
    # Docs inherited from microypython (but not templates or README.md, see below)
    "docs/**",
    # Module documentation
    "shared-bindings/**",
    "ports/*/bindings/**",
    # Port READMEs in various formats
    "ports/*/README*",
]
exclude_patterns = [
    "docs/autoapi/templates/**",
    "docs/README.md",
    "AGENTS.md",
    "**/AGENTS.md",
    "docs/library/weakref.rst",
]

# The reST default role (used for this markup: `text`) to use for all
# documents.
default_role = "any"

# If true, '()' will be appended to :func: etc. cross-reference text.
# add_function_parentheses = True

# If true, the current module name will be prepended to all description
# unit titles (such as .. function::).
# add_module_names = True

# If true, sectionauthor and moduleauthor directives will be shown in the
# output. They are ignored by default.
# show_authors = False

# The name of the Pygments (syntax highlighting) style to use.
pygments_style = "sphinx"

# A list of ignored prefixes for module index sorting.
# modindex_common_prefix = []

# If true, keep warnings as "system message" paragraphs in the built documents.
# keep_warnings = False

# Global include files. Sphinx docs suggest using rst_epilog in preference
# of rst_prolog, so we follow. Absolute paths below mean "from the base
# of the doctree".
rst_epilog = """
.. include:: /docs/templates/replace.inc
"""

# -- Options for HTML output ----------------------------------------------

import sphinx_rtd_theme

html_theme = "sphinx_rtd_theme"

# Theme options are theme-specific and customize the look and feel of a theme
# further.  For a list of options available for each theme, see the
# documentation.
# html_theme_options = {}

# Add any paths that contain custom themes here, relative to this directory.
# html_theme_path = ['.']

# The name for this set of Sphinx documents.  If None, it defaults to
# "<project> v<release> documentation".
# html_title = None

# A shorter title for the navigation bar.  Default is the same as html_title.
# html_short_title = None

# The name of an image file (relative to this directory) to place at the top
# of the sidebar.
# html_logo = '../../logo/trans-logo.png'

# The name of an image file (within the static path) to use as favicon of the
# docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
# pixels large.
html_favicon = "docs/static/favicon.ico"

# Add any paths that contain custom static files (such as style sheets) here,
# relative to this directory. They are copied after the builtin static files,
# so a file named "default.css" will overwrite the builtin "default.css".
html_static_path = ["docs/static"]

# Add any extra paths that contain custom files (such as robots.txt or
# .htaccess) here, relative to this directory. These files are copied
# directly to the root of the documentation.
# html_extra_path = []

# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
# using the given strftime format.
html_last_updated_fmt = "%d %b %Y"

# If true, SmartyPants will be used to convert quotes and dashes to
# typographically correct entities.
# html_use_smartypants = True

# Custom sidebar templates, maps document names to template names.
# html_sidebars = {}

# Additional templates that should be rendered to pages, maps page names to
# template names.
# html_additional_pages = {"index": "topindex.html"}

# If false, no module index is generated.
# html_domain_indices = True

# If false, no index is generated.
# html_use_index = True

# If true, the index is split into individual pages for each letter.
# html_split_index = False

# If true, links to the reST sources are added to the pages.
# html_show_sourcelink = True

# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
# html_show_sphinx = True

# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
# html_show_copyright = True

# If true, an OpenSearch description file will be output, and all pages will
# contain a <link> tag referring to it.  The value of this option must be the
# base URL from which the finished HTML is served.
# html_use_opensearch = ''

# This is the file name suffix for HTML files (e.g. ".xhtml").
# html_file_suffix = None

# Output file base name for HTML help builder.
htmlhelp_basename = "CircuitPythondoc"


# -- Options for LaTeX output ---------------------------------------------

latex_elements = {
    # The paper size ('letterpaper' or 'a4paper').
    #'papersize': 'letterpaper',
    # The font size ('10pt', '11pt' or '12pt').
    #'pointsize': '10pt',
    # Additional stuff for the LaTeX preamble.
    #'preamble': '',
    # Include 3 levels of headers in PDF ToC
    "preamble": r"""
\setcounter{tocdepth}{2}
\hbadness=99999
\hfuzz=20pt
\usepackage{pdflscape}
\DeclareUnicodeCharacter{FFFD}{?}
""",
}

# Grouping the document tree into LaTeX files. List of tuples
# (source start file, target name, title,
#  author, documentclass [howto, manual, or own class]).
latex_documents = [
    (
        "docs/pdf",
        "CircuitPython.tex",
        "CircuitPython Documentation",
        "CircuitPython Contributors",
        "manual",
    ),
    # Uncomment this if you want to build a PDF of the board -> module support matrix.
    # ("shared-bindings/support_matrix", 'SupportMatrix.tex', 'Board Support Matrix',
    # 'CircuitPython Contributors', 'manual'),
]

# The name of an image file (relative to this directory) to place at the top of
# the title page.
# latex_logo = None

# For "manual" documents, if this is true, then toplevel headings are parts,
# not chapters.
# latex_use_parts = False

# If true, show page references after internal links.
# latex_show_pagerefs = False

# If true, show URL addresses after external links.
# latex_show_urls = False

# Documents to append as an appendix to all manuals.
# latex_appendices = []

# If false, no module index is generated.
# latex_domain_indices = True


# -- Options for manual page output ---------------------------------------

# One entry per manual page. List of tuples
# (source start file, name, description, authors, manual section).
man_pages = [
    ("index", "CircuitPython", "CircuitPython Documentation", ["CircuitPython contributors"], 1),
]

# If true, show URL addresses after external links.
# man_show_urls = False


# -- Options for Texinfo output -------------------------------------------

# Grouping the document tree into Texinfo files. List of tuples
# (source start file, target name, title, author,
#  dir menu entry, description, category)
texinfo_documents = [
    (
        master_doc,
        "CircuitPython",
        "CircuitPython Documentation",
        "CircuitPython contributors",
        "CircuitPython",
        "Python for Microcontrollers.",
        "Miscellaneous",
    ),
]

# Documents to append as an appendix to all manuals.
# texinfo_appendices = []

# If false, no module index is generated.
# texinfo_domain_indices = True

# How to display URL addresses: 'footnote', 'no', or 'inline'.
# texinfo_show_urls = 'footnote'

# If true, do not generate a @detailmenu in the "Top" node's menu.
# texinfo_no_detailmenu = False


# Example configuration for intersphinx: refer to the Python standard library.
intersphinx_mapping = {
    "python": ("https://docs.python.org/3/", None),
    "register": ("https://circuitpython.readthedocs.io/projects/register/en/latest/", None),
    "mcp2515": ("https://circuitpython.readthedocs.io/projects/mcp2515/en/latest/", None),
    "typing": (
        "https://circuitpython.readthedocs.io/projects/adafruit-circuitpython-typing/en/latest/",
        None,
    ),
}

# Adapted from sphinxcontrib-redirects
from sphinx.builders import html as builders

TEMPLATE = """<html>
  <head><meta http-equiv="refresh" content="0; url=%s"/></head>
</html>
"""


def generate_redirects(app):
    path = os.path.join(app.srcdir, app.config.redirects_file)
    if not os.path.exists(path):
        logging.error("Could not find redirects file at '%s'" % path)
        return

    if not isinstance(app.builder, builders.StandaloneHTMLBuilder):
        logging.warning(
            "The 'sphinxcontib-redirects' plugin is only supported "
            "by the 'html' builder and subclasses. Skipping..."
        )
        logging.warning(f"Builder is {app.builder.name} ({type(app.builder)})")
        return

    with open(path) as redirects:
        for line in redirects.readlines():
            from_path, to_path = line.rstrip().split(" ")

            logging.debug("Redirecting '%s' to '%s'" % (from_path, to_path))

            from_path = os.path.splitext(from_path)[0] + ".html"
            to_path_prefix = "..%s" % os.path.sep * (len(from_path.split(os.path.sep)) - 1)
            to_path = to_path_prefix + to_path

            redirected_filename = os.path.join(app.builder.outdir, from_path)
            redirected_directory = os.path.dirname(redirected_filename)
            if not os.path.exists(redirected_directory):
                os.makedirs(redirected_directory)

            with open(redirected_filename, "w") as f:
                f.write(TEMPLATE % urllib.parse.quote(to_path, "#/"))


def adafruit_typing_workaround(app, env, node, contnode):
    # Sphinx marks a requesting node that uses circuitpython-typing
    # as looking for a "class" definition, but unfortunately
    # Sphinx doesn't recognize TypeAlias based types usefully from
    # the typing library.
    # (see: https://github.com/sphinx-doc/sphinx/issues/8934)
    # Instead, it categorizes these types as "data".
    # (see: python -m sphinx.ext.intersphinx \
    #   https://docs.circuitpython.org/projects/adafruit-circuitpython-typing/en/latest/objects.inv)
    # This workaround traps missing references, checks if
    # they are likely to be in the circuitpython_typing package,
    # and changes the requesting type from "class" to "data" if
    # needed, and re-tries the reference resolver.
    ref = node.get("reftarget", None)
    if ref and ref.startswith("circuitpython_typing."):
        dtype = node.get("reftype", None)
        if dtype != "data":
            node.attributes.update({"reftype": "data"})
            return intersphinx.missing_reference(app, env, node, contnode)


class CoreModuleTransform(SphinxTransform):
    default_priority = 870

    def _convert_first_paragraph_into_title(self):
        title = self.document.next_node(nodes.title)
        paragraph = self.document.next_node(nodes.paragraph)
        if not title or not paragraph:
            return
        if isinstance(paragraph[0], nodes.paragraph):
            paragraph = paragraph[0]
        if all(isinstance(child, nodes.Text) for child in paragraph.children):
            for child in paragraph.children:
                title.append(nodes.Text(" \u2013 "))
                title.append(child)
            paragraph.parent.remove(paragraph)

    def _enable_linking_to_nonclass_targets(self):
        for desc in self.document.traverse(addnodes.desc):
            for xref in desc.traverse(addnodes.pending_xref):
                if xref.attributes.get("reftype") == "class":
                    xref.attributes.pop("refspecific", None)

    def apply(self, **kwargs):
        docname = self.env.docname
        if docname.startswith(autoapi_root) and docname.endswith("/index"):
            self._convert_first_paragraph_into_title()
            self._enable_linking_to_nonclass_targets()


def setup(app):
    app.add_css_file("customstyle.css")
    app.add_css_file("filter.css")
    app.add_js_file("filter.js")
    app.add_config_value("redirects_file", "redirects", "env")
    app.connect("builder-inited", generate_redirects)
    app.connect("missing-reference", adafruit_typing_workaround)
    app.add_transform(CoreModuleTransform)