fix_internal_links only fixes pages and images, but not attachments

[EricDuminil]

One of my documentation websites offers internal links to Python scripts, text files and spreadsheets. Downloading those files work as expected from the MkDocs website.

The corresponding links get converted to anchors by mkdocs-print-site-plugin, though, and cannot be accessed anymore from the print_page or the resulting PDF.

For example, in Markdown:

[`hello.py`](../attachments/scripts/hello.py){target=_blank}

gets converted by MkDocs to:

<a href="../../attachments/scripts/hello.py" target="_blank"><code>hello.py</code></a>

and then by mkdocs-print-site-plugin:

<a href="#attachments-scripts-hello.py" target="_blank"><code>hello.py</code></a>

But this anchor doesn't exist.

Could it be possible to fix the resulting urls, like, AFAICT, fix_image_src does for images?

One quick-and-dirty fix I found is to modify https://github.com/timvink/mkdocs-print-site-plugin/blob/master/mkdocs_print_site_plugin/urls.py#L100 in order to consider those attachments as external url:

    if is_external(url) or url.endswith('.py') or url.endswith('.xlsx') or url.endswith('.txt'):
        continue

It might be a good idea to also apply add_full_urls: true to those attachments, so that the corresponding files can still be found even when the documentation is printed to paper.

[timvink]

Thanks for this one! Another edge case I had not foreseen. Your example and potential solution really helped in fixing this as well.

Should work in v1.1 now (https://github.com/timvink/mkdocs-print-site-plugin/releases)