Request for Mermaid inline diagram support

[frehberg]

AFAICS, github markdown supports mermaid inline diagrams, for example in README.md or this posting (do you see the rendered mermaid graph below?)

https://github.blog/2022-02-14-include-diagrams-markdown-files-mermaid/

Does crate info page at crates.io support mermaid inline diagrams as well, if generated from project's README.md ?

Regarding docs as code, rendering the mermaid graphs of project's README.md in crates.io would be really nice!

```mermaid
     graph TD;
          mermaid -- supported-by --> rust-docs(rust docs aquamarine plugin);
          mermaid -- supported-by --> github;
          mermaid -- supported-by --> gitlab;
          mermaid -- supported-by --> reveal.JS;
          mermaid -- supported-by --> vue.JS;
          mermaid -- ? --> crates.io(crates.io markdown rendering pipeline); 
```

     graph TD;
          mermaid -- supported-by --> rust-docs(rust docs aquamarine plugin);
          mermaid -- supported-by --> github;
          mermaid -- supported-by --> gitlab;
          mermaid -- supported-by --> reveal.JS;
          mermaid -- supported-by --> vue.JS;
          mermaid -- ? --> crates.io(crates.io markdown rendering pipeline); 

[Turbo87]

This is currently not supported, sorry.

[Odonno]

Thank you for this @Turbo87, it works really great.

[Turbo87]

all thanks goes to @ToBinio, who figured out a way to implement this. also, there is still #6786, which needs to be solved before it is fully supported :)

[frehberg]

It would be great if crates.io would support mermaid inline diagrams when scanning the specified markdown file (README.md by default)
Please join this request.

[fhaefemeier]

I would like to extend this request: Please support Kroki instead of a single diagram format. Kroki is the umbrella service to support a lot of different diagram formats.

[Odonno]

Yes. I would love that too. However, if this is a complex feature to implement, it could be possible to hide it from the crates.io readme web page? Instead of having something ugly or nothing, I prefer nothing. You could maybe parse the code section with a custom property and remove the entire code section, like this:

-```mermaid,hide
Example of a mermaid diagram
-```

This way, you can check if hide is present in the list for this code section and hide it.

(I added the extra "-" so you can see the code, this is not part of my idea).