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__init__.py
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__init__.py
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"""A clean customisable Sphinx documentation theme."""
__version__ = "2024.01.29.dev1"
import hashlib
import logging
import os
from functools import lru_cache
from pathlib import Path
from typing import Any, Dict, Iterator, List, Optional, cast
import sphinx.application
from docutils import nodes
from pygments.formatters import HtmlFormatter
from pygments.style import Style
from pygments.token import Text
from sphinx.builders.dirhtml import DirectoryHTMLBuilder
from sphinx.builders.html import StandaloneHTMLBuilder
from sphinx.environment.adapters.toctree import TocTree
from sphinx.errors import ConfigError
from sphinx.highlighting import PygmentsBridge
from sphinx.transforms.post_transforms import SphinxPostTransform
from .navigation import get_navigation_tree
THEME_PATH = (Path(__file__).parent / "theme" / "furo").resolve()
logger = logging.getLogger(__name__)
# GLOBAL STATE
_KNOWN_STYLES_IN_USE: Dict[str, Optional[Style]] = {
"light": None,
"dark": None,
}
class WrapTableAndMathInAContainerTransform(SphinxPostTransform):
"""A Sphinx post-transform that wraps `table` and `div.math` in a container `div`.
This makes it possible to handle these overflowing the content-width, which is
necessary in a responsive theme.
"""
formats = ("html",)
default_priority = 500
def run(self, **kwargs: Any) -> None:
"""Perform the post-transform on `self.document`."""
get_nodes = (
self.document.findall # docutils 0.18+
if hasattr(self.document, "findall")
else self.document.traverse # docutils <= 0.17.x
)
for node in list(get_nodes(nodes.table)):
new_node = nodes.container(classes=["table-wrapper"])
new_node.update_all_atts(node)
node.parent.replace(node, new_node)
new_node.append(node)
for node in list(get_nodes(nodes.math_block)):
new_node = nodes.container(classes=["math-wrapper"])
new_node.update_all_atts(node)
node.parent.replace(node, new_node)
new_node.append(node)
def has_not_enough_items_to_show_toc(
builder: StandaloneHTMLBuilder, docname: str
) -> bool:
"""Check if the toc has one or fewer items."""
assert builder.env
toctree = TocTree(builder.env).get_toc_for(docname, builder)
try:
self_toctree = toctree[0][1] # type: ignore[index]
except IndexError:
val = True
else:
# There's only the page's own toctree in there.
val = len(self_toctree) == 1 and self_toctree[0].tagname == "toctree"
return val
def get_pygments_style_colors(
style: Style, *, fallbacks: Dict[str, str]
) -> Dict[str, str]:
"""Get background/foreground colors for given pygments style."""
background = style.background_color # type: ignore[attr-defined]
text_colors = style.style_for_token(Text) # type: ignore[attr-defined]
foreground = text_colors["color"]
if not background:
background = fallbacks["background"]
if not foreground:
foreground = fallbacks["foreground"]
else:
foreground = f"#{foreground}"
return {"background": background, "foreground": foreground}
@lru_cache(maxsize=2)
def get_colors_for_codeblocks(
highlighter: PygmentsBridge, *, fg: str, bg: str
) -> Dict[str, str]:
"""Get background/foreground colors for given pygments style."""
return get_pygments_style_colors(
highlighter.formatter_args["style"],
fallbacks={
"foreground": fg,
"background": bg,
},
)
def _compute_navigation_tree(context: Dict[str, Any]) -> str:
# The navigation tree, generated from the sphinx-provided ToC tree.
if "toctree" in context:
toctree = context["toctree"]
toctree_html = toctree(
collapse=False,
titles_only=True,
maxdepth=-1,
includehidden=True,
)
else:
toctree_html = ""
return get_navigation_tree(toctree_html)
def _compute_hide_toc(
context: Dict[str, Any],
*,
builder: StandaloneHTMLBuilder,
docname: str,
) -> bool:
# Should the table of contents be hidden?
file_meta = context.get("meta", None) or {}
if "hide-toc" in file_meta:
return True
elif "toc" not in context:
return True
elif not context["toc"]:
return True
return has_not_enough_items_to_show_toc(builder, docname)
@lru_cache(maxsize=None)
def _asset_hash(path: str) -> str:
"""Append a `?digest=` to an url based on the file content."""
full_path = THEME_PATH / "static" / path
digest = hashlib.sha1(full_path.read_bytes()).hexdigest()
return f"_static/{path}?digest={digest}"
def _add_asset_hashes(static: List[str], add_digest_to: List[str]) -> None:
if sphinx.version_info >= (7, 1):
# https://github.com/sphinx-doc/sphinx/pull/11415 added the relevant
# functionality to Sphinx, so we don't need to do anything.
return
for asset in add_digest_to:
try:
index = static.index("_static/" + asset)
except ValueError:
raise ConfigError(
"Furo is trying to add a digest to an asset that is not in the "
f"static files: {asset}. Please check conf.py for overrides of "
"theme-provide assets such as `html_style`."
)
# Make this idempotent
if "?digest=" in static[index].filename: # type: ignore[attr-defined]
continue
static[index].filename = _asset_hash(asset) # type: ignore[attr-defined]
def _fix_canonical_url(
app: sphinx.application.Sphinx, pagename: str, context: Dict[str, Any]
) -> None:
"""Fix the canonical URL when using the dirhtml builder.
Sphinx builds a canonical URL if ``html_baseurl`` config is set. However,
it builds a URL ending with ".html" when using the dirhtml builder, which is
incorrect. Detect this and generate the correct URL for each page.
"""
if (
not app.config.html_baseurl
or not isinstance(app.builder, DirectoryHTMLBuilder)
or not context["pageurl"]
or not context["pageurl"].endswith(".html")
):
return
target = app.builder.get_target_uri(pagename)
context["pageurl"] = app.config.html_baseurl + target
def _html_page_context(
app: sphinx.application.Sphinx,
pagename: str,
templatename: str,
context: Dict[str, Any],
doctree: Any,
) -> None:
if "css_files" in context:
_add_asset_hashes(
context["css_files"],
["styles/furo.css", "styles/furo-extensions.css"],
)
if "scripts" in context:
_add_asset_hashes(
context["scripts"],
["scripts/furo.js"],
)
_fix_canonical_url(app, pagename, context)
# Basic constants
context["furo_version"] = __version__
# Values computed from page-level context.
context["furo_navigation_tree"] = _compute_navigation_tree(context)
context["furo_hide_toc"] = _compute_hide_toc(
context, builder=cast(StandaloneHTMLBuilder, app.builder), docname=pagename
)
assert _KNOWN_STYLES_IN_USE["light"]
assert _KNOWN_STYLES_IN_USE["dark"]
# Inject information about styles
context["furo_pygments"] = {
"light": get_pygments_style_colors(
_KNOWN_STYLES_IN_USE["light"],
fallbacks=dict(
foreground="black",
background="white",
),
),
"dark": get_pygments_style_colors(
_KNOWN_STYLES_IN_USE["dark"],
fallbacks=dict(
foreground="white",
background="black",
),
),
}
def _builder_inited(app: sphinx.application.Sphinx) -> None:
if "furo" in app.config.extensions:
raise ConfigError(
"Did you list 'furo' in the `extensions` in conf.py? "
"If so, please remove it. Furo does not work with non-HTML builders "
"and specifying it as an `html_theme` is sufficient."
)
looks_like_html_builder = isinstance(app.builder, StandaloneHTMLBuilder) or (
app.builder.name in {"html", "dirhtml"}
)
if not looks_like_html_builder:
raise ConfigError(
"Furo is being used as an extension in a non-HTML build. "
"This should not happen."
)
# Our JS file needs to be loaded as soon as possible.
app.add_js_file("scripts/furo.js", priority=200)
# 500 is the default priority for extensions, we want this after this.
app.add_css_file("styles/furo-extensions.css", priority=600)
builder = app.builder
assert (
builder.highlighter is not None # type: ignore[attr-defined]
), "there should be a default style known to Sphinx"
assert (
builder.dark_highlighter is None # type: ignore[attr-defined]
), "this shouldn't be a dark style known to Sphinx"
update_known_styles_state(app)
def _update_default(key: str, *, new_default: Any) -> None:
try:
conf_py_settings = app.config._raw_config
except AttributeError:
pass # Sphinx's config has changed.
else:
if key not in conf_py_settings:
app.config._raw_config.setdefault(key, new_default)
# Change the default permalinks icon
_update_default("html_permalinks_icon", new_default="#")
def update_known_styles_state(app: sphinx.application.Sphinx) -> None:
"""Update a global store of known styles of this application."""
global _KNOWN_STYLES_IN_USE
_KNOWN_STYLES_IN_USE = {
"light": _get_light_style(app),
"dark": _get_dark_style(app),
}
def _get_light_style(app: sphinx.application.Sphinx) -> Style:
# fmt: off
# For https://github.com/psf/black/issues/3869
return (
app # type: ignore[no-any-return]
.builder
.highlighter # type: ignore[attr-defined]
.formatter_args["style"]
)
# fmt: on
def _get_dark_style(app: sphinx.application.Sphinx) -> Style:
dark_style = app.config.pygments_dark_style
return cast(Style, PygmentsBridge("html", dark_style).formatter_args["style"])
def _get_styles(formatter: "HtmlFormatter[str]", *, prefix: str) -> Iterator[str]:
"""Get styles out of a formatter, where everything has the correct prefix."""
for line in formatter.get_linenos_style_defs(): # type: ignore[no-untyped-call]
yield f"{prefix} {line}"
yield from formatter.get_background_style_defs(prefix)
yield from formatter.get_token_style_defs(prefix)
def get_pygments_stylesheet() -> str:
"""Generate the theme-specific pygments.css.
There is no way to tell Sphinx how the theme handles dark mode; at this time.
"""
light_formatter = PygmentsBridge.html_formatter(style=_KNOWN_STYLES_IN_USE["light"])
dark_formatter = PygmentsBridge.html_formatter(style=_KNOWN_STYLES_IN_USE["dark"])
lines: List[str] = []
lines.extend(_get_styles(light_formatter, prefix=".highlight"))
lines.append("@media not print {")
dark_prefix = 'body[data-theme="dark"] .highlight'
lines.extend(_get_styles(dark_formatter, prefix=dark_prefix))
not_light_prefix = 'body:not([data-theme="light"]) .highlight'
lines.append("@media (prefers-color-scheme: dark) {")
lines.extend(_get_styles(dark_formatter, prefix=not_light_prefix))
lines.append("}")
lines.append("}")
return "\n".join(lines)
# Yup, we overwrite the default pygments.css file, because it can't possibly respect
# the needs of this theme.
def _overwrite_pygments_css(
app: sphinx.application.Sphinx,
exception: Optional[Exception],
) -> None:
if exception is not None:
return
assert app.builder
with open(
os.path.join(app.builder.outdir, "_static", "pygments.css"),
"w",
encoding="utf-8",
) as f:
f.write(get_pygments_stylesheet())
def setup(app: sphinx.application.Sphinx) -> Dict[str, Any]:
"""Entry point for sphinx theming."""
app.require_sphinx("6.0")
app.add_config_value(
"pygments_dark_style", default="native", rebuild="env", types=[str]
)
app.add_html_theme("furo", str(THEME_PATH))
app.add_post_transform(WrapTableAndMathInAContainerTransform)
app.connect("html-page-context", _html_page_context)
app.connect("builder-inited", _builder_inited)
app.connect("build-finished", _overwrite_pygments_css)
return {
"parallel_read_safe": True,
"parallel_write_safe": True,
"version": __version__,
}