Doom - setting code formatter for specific file type

Question

How can I change formatter used for specific file type in doom-emacs format module? So far I've been happy with using mostly doom defaults and haven't gotten into writing custom configurations and seriously using Elisp, so I'm a bit lost.

I'm trying to use doom-emacs as an IDE for Laravel development and I'm running into problems with Blade files. The main one being wrong code auto formatting. Prettier run from the command line has no problem formating the files, but doom defaults do. Eg.:

Input:

@section('content')
 @foreach ($posts as $post)
          <article class="article">
     </article>
       @endforeach
@endsection

Result:

@section('content')
@foreach ($posts as $post)
<article class="article">
</article>
@endforeach
@endsection

Expected:

@section('content')
    @foreach ($posts as $post)
        <article class="article">
        </article>
    @endforeach
@endsection

I'm using +onsave option. The files are opened in web-mode and the extension is *.blade.php. And I think it's using lsp formatting by default.

I've tried using (set-formatter! 'prettier "prettier" :modes '(web-mode)) and setting format-with-lsp to nil just to see if I can force the web-mode itself to use prettier. But no luck.

1. How can I change the formatter used?
2. How can I specify on which file extension it should be used?

I've been searching format-all, Doom, Googleing and trying find something in the source code, but no luck so far.

Answer 1

The package behind the format module is format-all. Going down the rabbit hole, its method of determining the current buffer's language is delegated to language-id, which has a nice DSL for detecting web-mode peculiarities. Adding a entry for blade may cut it:

(after! format-all
  (add-to-list 'language-id--definitions
               '("PHP"
                 php-mode
                 (web-mode
                  (web-mode-engine "blade")))))

Or, you could use web-mode-buffer-indent :)

Answer 2

Doom has now switched from using format-all to the apheleia package to handle formatting, and prettier is already the default formatter for web-mode buffers, so for the purposes of this question it is only necessary to ensure that web-mode is enabled for *.blade.php files, see: how do I enable web-mode .blade.php files? for details in how to do that in case it is not already configured in Doom (which I think it is).