On Sun, Aug 9, 2020, 12:35 PM Yves Chevallier <canard...@gmail.com> wrote:
> I noticed a lot of complexity in Sphinx due to the fact the nodes cannot
> be altered during the EnvironmentCollector phase. However I don't
> understand why it works that way.
>
> For example, here below I would like to *tag* each `nodes.title` with an
> attribute, but as this is not the same instance, the added information is
> lost somewhere.
>
> Does anybody know what is the properway of passing information form the
> EnvironmentCollector to the Builder, and then to the Writer?
>
> ```python
> from docutils import nodes
> from sphinx.writers.latex import LaTeXTranslator
> from sphinx import addnodes
> from sphinx.environment.collectors import EnvironmentCollector
>
>
> def depart_title(self, node):
> if not node['foobar']:
> raise ValueError('Why?')
>
>
> class TitleCollector(EnvironmentCollector):
> def get_updated_docs(self, app, env):
> def traverse_all(app, env, docname):
> doctree = env.get_doctree(docname)
>
> for toc in doctree.traverse(addnodes.toctree):
> for _, subdocname in toc['entries']:
> traverse_all(app, env, subdocname)
>
> for node in doctree.traverse(nodes.title):
> node['foobar'] = 42
>
> traverse_all(app, env, env.config.master_doc)
> return []
>
> def clear_doc(self, app, env, docname):
> pass
>
> def process_doc(self, app, doctree):
> pass
>
> def merge_other(self, app, env, docnames, other):
> pass
>
> def setup(app):
> app.add_env_collector(TitleCollector)
> LaTeXTranslator.depart_title = depart_title
>
> return {
> 'version': '0.1',
> 'parallel_read_safe': True,
> 'parallel_write_safe': True,
> }
> ```
>
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