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"""Provides the ``ifconfig`` directive.
The ``ifconfig`` directive enables writing documentation
that is included depending on configuration variables.
Usage::
.. ifconfig:: releaselevel in ('alpha', 'beta', 'rc')
This stuff is only included in the built docs for unstable versions.
The argument for ``ifconfig`` is a plain Python expression, evaluated in the
namespace of the project configuration (that is, all variables from
``conf.py`` are available.)
"""
from __future__ import annotations
from typing import Any
from docutils import nodes
from docutils.nodes import Node
import sphinx
from sphinx.application import Sphinx
from sphinx.util.docutils import SphinxDirective
from sphinx.util.nodes import nested_parse_with_titles
from sphinx.util.typing import OptionSpec
class ifconfig(nodes.Element):
pass
class IfConfig(SphinxDirective):
has_content = True
required_arguments = 1
optional_arguments = 0
final_argument_whitespace = True
option_spec: OptionSpec = {}
def run(self) -> list[Node]:
node = ifconfig()
node.document = self.state.document
self.set_source_info(node)
node['expr'] = self.arguments[0]
nested_parse_with_titles(self.state, self.content, node, self.content_offset)
return [node]
def process_ifconfig_nodes(app: Sphinx, doctree: nodes.document, docname: str) -> None:
ns = {confval.name: confval.value for confval in app.config}
ns.update(app.config.__dict__.copy())
ns['builder'] = app.builder.name
for node in list(doctree.findall(ifconfig)):
try:
res = eval(node['expr'], ns) # NoQA: PGH001
except Exception as err:
# handle exceptions in a clean fashion
from traceback import format_exception_only
msg = ''.join(format_exception_only(err.__class__, err))
newnode = doctree.reporter.error('Exception occurred in '
'ifconfig expression: \n%s' %
msg, base_node=node)
node.replace_self(newnode)
else:
if not res:
node.replace_self([])
else:
node.replace_self(node.children)
def setup(app: Sphinx) -> dict[str, Any]:
app.add_node(ifconfig)
app.add_directive('ifconfig', IfConfig)
app.connect('doctree-resolved', process_ifconfig_nodes)
return {'version': sphinx.__display_version__, 'parallel_read_safe': True}
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