WIP: add Svelte support (.svelte)

[chadsr]

Adds support for mixed comment support (JS/HTML syntax) found in .svelte files

[chadsr]

It seems adding mixed support of JS and HTML style comments is not straightforward with the current action.

Svelte's ace_mode property in https://raw.githubusercontent.com/github/linguist/master/lib/linguist/languages.yml returns html (codemirror_mode is htmlmixed)

Am I correct in assuming that mixed comments of this sort are currently not possible due to the usage of ace_mode making only HTML style comments recognisable?

[alstr]

Yes, that would be a challenge to overcome at this stage unfortunately. I imagine the action could check codemirror_mode and then do something different if that is htmlmixed; it would just add some extra layers of complexity. Open to ideas though.

[alstr]

Thinking about it, you could try adding the comment syntax for HTML and JS under the one language definition. I think that might work, but I've not tried it myself.

The ace_mode doesn't really have a major impact beyond syntax highlighting, so it shouldn't affect the actual parsing of TODOs.

(This is based on memory and I may be completely wrong 😆).

[alstr]

Feel free to resubmit if you're able to revisit this.