Robin Malfait 711b9cd0db
Pre process Slim templates embedded in Ruby files (#17336)
This PR fixes an issue where embedded Slim templates inside of Ruby
files are not pre processed because we pre process based on a file
extension.

This PR also handles embedded SLIM templates using the following syntax:

```rb
slim_template <<~SLIM
  .flex
    .flex-1
      h1 Hello World
    .flex-1
      p This is a test
SLIM
```

~~As far as I can tell, this is only a Slim template thing and not a
Haml template thing but I could be wrong here. See:
https://viewcomponent.org/guide/templates.html#interpolations~~

The ViewComponent package handles anything that looks like
`{lang}_template`, so the lang here will be used as the pre processing
language for now.

Fixes: #17334

# Test plan

1. Added test for this
2. Existing tests pass
3. Made sure that the snippet from the issue works as expected:

Added an example where we have a `slim_template` and a `svelte_template`
to prove that it embeds based on the language. I also added a
`html_template` with Svelte syntax to really make sure that that
_doesn't_ work.

<img width="1816" alt="image"
src="https://github.com/user-attachments/assets/35564a32-9c46-4b51-bb1f-e02f4ffe8b01"
/>
2025-03-24 11:58:37 +01:00
..
2025-03-20 17:51:30 +01:00