Supporting web-sys and other packages with generated bindings

[chinedufn]

Auto generated bindings such as those in web-sys don't show up in auto complete.

So, for example: if you typed:

fn main () {
  web_sys::WebG
}

You'd expect the auto completion to suggest WebGlRenderingContext, but it doesn't suggest anything.

---

Here are some related issues in intellij-rust (I include them because my uneducated assumption is that rust-analyzer has the same challenge. If they're unrelated I'd be happy to remove the links!)

intellij-rust/intellij-rust#1908
intellij-rust/intellij-rust#3131

---

Cheers!

[edwin0cheng]

I think this issue related to following things RA is missing / still developing right now:

• proc_macro
• allow register internal macro in ra_mbe , related rustc code : link
• Support target/......../out directory in ra_vfs ?!
• how to handle std::env ? It is quite tricky..

[jrvidal]

Re: env!(...)/std::env... how would one even go about that? Does cargo expose that information in any way?

[matklad]

how would one even go about that?

We should have a white-list of environmental variables that are exposed to analyzer as an input:

#[salsa::input]
fn env_var(&self, crate: CrateId, name: SmolStr) -> SmolStr

Note that we have a CrateId parameter there as well: env vars could be different for various crates.

[chinedufn]

Are there any open issues related to some of the things that are necessary for this to be possible that I can follow?
Thanks so much!

[lnicola]

@chinedufn I guess #1428 wouldn't hurt here.

[matklad]

Let's close this in favor of more specific #1964

[CGMossa]

This is still relevant, I think #4150 is the most recent issue that is related to this.