fix(assets): Handle more assets

[kamilkrzyskow]

Some assets (like images) might stay the same across different language builds, as in no localized version is available.
Currently only the default language adds the files to the internal files list and built alternates show a warning that a file isn't found in the documentation files.

This PR tries to fix just that by always including any non .md file to the build, so that would include .png .jpg .js etc. files.
As far as I know, the files aren't being duplicated in the alternate builds, just that the path to them is properly resolved.

It partially helps with #251

EDIT:
Actually, unrelated to #252

[ultrabug]

The issue with #252 is unfortunately not related to this PR as per my comment

Can you elaborate on what if fixes exactly on #251 please? A simple and clear example would help me a lot!

[kamilkrzyskow]

Bummer 😞, it definitely fixes my issue where the assets are placed in the overrides, because I tested it with my setup.

Issue 1 from #251 as explained in the first comment.

Today I won't be at my PC so I won't be be able to create any example till tomorrow.

[AngryMane]

@kamilkrzyskow
Hmmm. If you want to implement this plan, I think you need to modify the dest_path and abs_dest_path of the file as follows.

elif self.is_default_language_build or not file.src_uri.endswith(".md"):
                import os
                locale_site_dir = self.current_language if self.current_language ! = self.default_language else ""
                file.dest_path = Path(locale_site_dir) / file.dest_path
                file.abs_dest_path = os.path.normpath(os.path.join(mkdocs_config.site_dir, file.dest_path))

However, this plan would not accommodate cases where various files in various directories load the same template.

$ tree
.
├── docs
│   ├── index.cs.md
│   ├── index.md
│   ├── index.pl.md
│   └── nested
│       ├── nested.cs.md
│       ├── nested.md
│       └── nested.pl.md
├── mkdocs.yml
└── overrides
    ├── assets
    │   └── images
    │       └── test.drawio.svg
    └── main.html

5 directories, 9 files

At this time, if all files index.md, index.pl.md, index.cs.md, nested/nested.md, nested/nested.pl.md, nested/nested.cs.md refer to the main.html template, the main. I don't think I can represent the path from html to test.drawio.svg statically.

sample project is here -> https://github.com/AngryMane/sample-mkdocs-prj

[AngryMane]

@kamilkrzyskow
I'm not sure, but your raising of the issue may point to a leak in mkdocs' spec consideration.
it seems to me that the paths to the links listed in the template should be corrected for each file that renders.
In fact, in md files, the link paths are modified.
https://github.com/mkdocs/mkdocs/blob/3db7b8c9c2473e763fc77525ee17c42e965d3b91/mkdocs/structure/pages.py#L425

[AngryMane]

@ultrabug's suggestion may be a smart way to handle this.

or, use abs path like '<img src="/assets/images/test.drawio.svg" width="100" height="100" />'

[kamilkrzyskow]

OK, AngryMane's example and Ultrabug's solution made it clear that this PR indeed doesn't fix #252 as the hardcoded links, in the html templates, are unaffected by the changes.

I agree, that Ultrabug's suggestion seems to be the most optimal, as for the abs path like /assets/images/test.drawio.svg in the HTML, it won't work with most GitHub Pages, because the link has a structure like username.github.io/repository/. So using the abs method requires to keep the real base path in mind.
Perhaps using the site_url MkDocs setting to inject it in Jinja2 might also work {{ config.site_url }}/assets/images/test.drawio.svg.

---

Moving back on topic of this PR:
@AngryMane, thanks a lot for your time and for creating an example project in my stead. My first issue from #251 is unrelated to templates, so I've adjusted the example:
i18n-regression.zip

No matter if it's nested or not, when building alternates MkDocs logs a warning:

WARNING -  Doc file 'index.pl.md' contains a relative link 'assets/images/test.drawio.svg', but the target is not found among documentation files.
WARNING -  Doc file 'nested/nested.pl.md' contains a relative link '../assets/images/test.drawio.svg', but the target 'assets/images/test.drawio.svg' is not found among documentation files.

The warning stems from the fact that alternates don't add the assets directory to the i18n_files list and MkDocs uses that list to search for paths referenced in Markdown.

I hope this cleared things up @ultrabug

[ultrabug]

Thanks @AngryMane and @kamilkrzyskow

I understand better now what you're trying to fix and thank you for providing everything.

I'd just like to propose this version instead which looks clearer to me?

[ultrabug]

Thanks @kamilkrzyskow and @AngryMane