78 lines
2.2 KiB
Python
78 lines
2.2 KiB
Python
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"""Add external links to module code in Python object descriptions."""
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from __future__ import annotations
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from typing import TYPE_CHECKING, Any
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from docutils import nodes
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import sphinx
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from sphinx import addnodes
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from sphinx.errors import SphinxError
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from sphinx.locale import _
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if TYPE_CHECKING:
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from docutils.nodes import Node
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from sphinx.application import Sphinx
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class LinkcodeError(SphinxError):
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category = "linkcode error"
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def doctree_read(app: Sphinx, doctree: Node) -> None:
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env = app.builder.env
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resolve_target = getattr(env.config, 'linkcode_resolve', None)
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if not callable(env.config.linkcode_resolve):
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msg = 'Function `linkcode_resolve` is not given in conf.py'
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raise LinkcodeError(msg)
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assert resolve_target is not None # for mypy
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domain_keys = {
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'py': ['module', 'fullname'],
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'c': ['names'],
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'cpp': ['names'],
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'js': ['object', 'fullname'],
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}
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for objnode in list(doctree.findall(addnodes.desc)):
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domain = objnode.get('domain')
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uris: set[str] = set()
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for signode in objnode:
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if not isinstance(signode, addnodes.desc_signature):
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continue
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# Convert signode to a specified format
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info = {}
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for key in domain_keys.get(domain, []):
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value = signode.get(key)
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if not value:
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value = ''
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info[key] = value
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if not info:
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continue
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# Call user code to resolve the link
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uri = resolve_target(domain, info)
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if not uri:
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# no source
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continue
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if uri in uris or not uri:
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# only one link per name, please
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continue
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uris.add(uri)
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inline = nodes.inline('', _('[source]'), classes=['viewcode-link'])
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onlynode = addnodes.only(expr='html')
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onlynode += nodes.reference('', '', inline, internal=False, refuri=uri)
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signode += onlynode
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def setup(app: Sphinx) -> dict[str, Any]:
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app.connect('doctree-read', doctree_read)
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app.add_config_value('linkcode_resolve', None, '')
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return {'version': sphinx.__display_version__, 'parallel_read_safe': True}
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