Add Mermaid chart support to readme files

[daveverwer]

Discussed in #3346

^{Originally posted by leogdion August 29, 2024}

from GitHub brightdigit/SublimationBonjour Repo

Mermaid is supported by Github Markdown...

From Swift Package Index brightidigt/SublimationBonjour Page

... but not the Swift Package Index site.

It seems that the javascript needs to be added to automatically parse these pre tags.

I'd love to help add support to this if needed.

[daveverwer]

I took a look and I think this would be a good addition to the site if you wanted to work on it, Leo.

You’ll already find a ReadmeController in readme_controller.js and you’ll probably need to add a connect function to initialise the Mermaid rendering there. Looks like there’s a standard package for rendering, so let’s use that. If you need to pre-process the HTML (which I don’t think will be necessary), we mainly do that in Swift in PackageReadme+Model.swift.

You can also find any readme-specific styles that you might need in readme.scss.

It should be a nicely self-contained bit of functionality. 👍

I’ll convert this into an issue now so we can track it and for any further discussion. I’m also happy to help out if you need any help getting up and running with the front-end development environment or with anything to do with the changes.

[leogdion]

Thanks @daveverwer for the hints and the database backup. Unfortunately when I try to load a a package page I'm not getting any of the README content:

• Is there a step I'm missing?
• It looks like that's pull from S3. Is there a way to do this or bypass it for development?

Leo

PS: I also had to change the Makefile to increase the size of the spi_dev to import the data:

	docker run --name spi_dev -e POSTGRES_DB=spi_dev -e POSTGRES_USER=spi_dev -e POSTGRES_PASSWORD=xxx -p 6432:5432 \
	-e PGDATA=/pgdata \
	--tmpfs /pgdata:rw,noexec,nosuid,size=1024m \
	-d postgres:16-alpine

[daveverwer]

Thanks @daveverwer for the hints and the database backup. Unfortunately when I try to load a a package page I'm not getting any of the README content:

Apologies, @leogdion, you also need an environment variable to be set for the scheme. Set it up like this:

PS: I also had to change the Makefile to increase the size of the spi_dev to import the data:

This is odd, I've not had to do that. Glad it's working though!