Add support for Angular templates

[tunibjork]

I've been using markup_fmt together with dprint to format html files in an Angular project for a while and it has been working fairly well with some minor quirks — mostly related to how code gets formatted inside interpolation blocks (anything between {{ and }}).

Now that a new control flow syntax has been introduced, it would be great to have support for this (and Angular in general) especially when it comes to indentation and splitting the closing brackets into different lines.

As an example, this:

@if (loading$ | async) {
  <div class="loader"></div>
}

gets formatted like this:

@if (loading$ | async) {
<div class="loader"></div>
}

Any possibility to have support for Angular templates? Not sure how much of an effort it would be but it would be greatly appreciated — I'd really like to avoid going back to prettier for html formatting...

[g-plane]

It's possible but I haven't learned Angular before so I need to read Angular documentation.

[tunibjork]

Happy to provide assistance with anything but writing rust (unfortunately...)

Forgot to mention that html in Angular can optionally be placed inside the .ts file, as a string literal in the template property of the @Component() decorator. Would be extra nice to support that as well, but I know it is probably not as easy.

[g-plane]

There're nothing can do at markup_fmt's side for string literal in template property, because those code are processed by other plugins such as dprint-plugin-typescript or dprint-plugin-biome.

[tunibjork]

Ah of course, that makes sense. I will ask there.

[g-plane]

Please note that I won't add support for the previous *ngIf, ngSwitch and *ngFor syntaxes because of complexity.