Line number not provided on build failure when urllib urlsplit fails #3939
Description
It's unfortunate for usability that in a case like this a line number (in the markdown file being processed) isn't provided. In my case this was a http://host URL which was missing the trailing / but the failure to propagate line number information made it hard to diagnose except by a naive process of elimination. I began to look at the code, but I'm not yet sure if this is possible to do without modifications to the markdown library, so I am not submitting a PR at this time. Thanks
DEBUG - [macros] - Rendering source page: path/to/file.md
DEBUG - [macros] - Page title: Some Title
DEBUG - Running `page_markdown` event from plugin 'table-reader'
ERROR - Error reading page 'path/to/file.md': Invalid IPv6 URL
Traceback (most recent call last):
File "/Users/alexandra.magin/code/engineering-docs/.venv/bin/mkdocs", line 10, in <module>
sys.exit(cli())
~~~^^
File "/Users/alexandra.magin/code/engineering-docs/.venv/lib/python3.13/site-packages/click/core.py", line 1161, in __call__
return self.main(*args, **kwargs)
~~~~~~~~~^^^^^^^^^^^^^^^^^
File "/Users/alexandra.magin/code/engineering-docs/.venv/lib/python3.13/site-packages/click/core.py", line 1082, in main
rv = self.invoke(ctx)
File "/Users/alexandra.magin/code/engineering-docs/.venv/lib/python3.13/site-packages/click/core.py", line 1697, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
File "/Users/alexandra.magin/code/engineering-docs/.venv/lib/python3.13/site-packages/click/core.py", line 1443, in invoke
return ctx.invoke(self.callback, **ctx.params)
~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/alexandra.magin/code/engineering-docs/.venv/lib/python3.13/site-packages/click/core.py", line 788, in invoke
return __callback(*args, **kwargs)
File "/Users/alexandra.magin/code/engineering-docs/.venv/lib/python3.13/site-packages/mkdocs/__main__.py", line 288, in build_command
build.build(cfg, dirty=not clean)
~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
File "/Users/alexandra.magin/code/engineering-docs/.venv/lib/python3.13/site-packages/mkdocs/commands/build.py", line 310, in build
_populate_page(file.page, config, files, dirty)
~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/alexandra.magin/code/engineering-docs/.venv/lib/python3.13/site-packages/mkdocs/commands/build.py", line 167, in _populate_page
page.render(config, files)
~~~~~~~~~~~^^^^^^^^^^^^^^^
File "/Users/alexandra.magin/code/engineering-docs/.venv/lib/python3.13/site-packages/mkdocs/structure/pages.py", line 285, in render
self.content = md.convert(self.markdown)
~~~~~~~~~~^^^^^^^^^^^^^^^
File "/Users/alexandra.magin/code/engineering-docs/.venv/lib/python3.13/site-packages/markdown/core.py", line 361, in convert
newRoot = treeprocessor.run(root)
File "/Users/alexandra.magin/code/engineering-docs/.venv/lib/python3.13/site-packages/mkdocs/structure/pages.py", line 370, in run
new_url = self.path_to_url(url)
File "/Users/alexandra.magin/code/engineering-docs/.venv/lib/python3.13/site-packages/mkdocs/structure/pages.py", line 420, in path_to_url
scheme, netloc, path, query, anchor = urlsplit(url)
~~~~~~~~^^^^^
File "/Users/alexandra.magin/.local/share/uv/python/cpython-3.13.2-macos-aarch64-none/lib/python3.13/urllib/parse.py", line 514, in urlsplit
raise ValueError("Invalid IPv6 URL")
ValueError: Invalid IPv6 URL