[FEATURE] Templ support

[AdamVig]

I'd like to use this plugin to lint HTML in Templ files, for example:

package main

templ Hello(name string) {
  <div>Hello, { name }</div>
}

templ Greeting(person Person) {
  <div class="greeting">
    @Hello(person.Name)
  </div>
}

Templ resources: https://github.com/a-h/templ / https://pkg.go.dev/github.com/a-h/templ

It almost works if I omit parserOptions.templateEngineSyntax, but, for example, it gets stuck on id={ myIdVariable } when @html-eslint/id-naming-convention is enabled.

I am going to try to implement this myself—just wanted to start a conversation here in case anyone is already thinking about this.

[yeonjuan]

Hello. Thank you for reporting the issue. This plugin has difficulty handling HTML in syntaxes other than HTML and JavaScript.
If there is a JavaScript-based parser capable of parsing Go language, we might consider developing a new plugin in the future. However, I don't think this will be developed quickly, and supporting Go seems somewhat challenging.

[AdamVig]

@yeonjuan I implemented Templ support in my company's fork of html-eslint, you can see it in this commit: Blue-Water-Autonomy@523f63b

It works on our codebase, but I don't think the implementation is worth trying to merge into this repository because it's complex and would increase your maintenance burden significantly. I'm experimenting with, instead, creating an html-eslint-compatible TemplLanguage that relies on the official Templ AST.

I'll update here if I get anywhere with this effort. Just wanted to share my initial outcomes so that other folks can avoid sinking time into this like I did!