No autocomplete for `extern C` type definitions

[chinedufn]

Environment

• Intellij-Rust plugin version:

Version: 0.2.0.2492-182-nightly (87)

• Rust toolchain version:

rustc 1.32.0-nightly (14997d56a 2018-12-05)

• IDE name and version:

PhpStorm 2018.2.4

• Operating system:

macOS Mojave 10.14

Problem description

There is no auto complete for the web-sys crate.

Steps to reproduce

1. Add web-sys as a dependency

[dependencies.web-sys]
version = "=0.3.6"
features = [
  'Document',
  'Element',
  'HtmlCanvasElement',
  'HtmlElement',
  'Node',
  'WebGlBuffer',
  'WebGlProgram',
  'WebGlRenderingContext',
  'WebGlShader',
  'WebGlVertexArrayObject',
  'WebGlUniformLocation',
  'Window',
  'console',
]

2. Type web_sys:: and the only autocomplete suggestion will be web_sys::window()

---

web_sys uses a ton of code generation and extern blocks, not sure if that's related here.

[chinedufn]

If hand wrote a couple of extern blocks to see what happened.. and they don't autocomplete either. So I'm assuming that extern blocks don't get completed in Intellij-rust right now?

For example, you won't get any autocomplete for these types:

use wasm_bindgen::prelude::*;

#[wasm_bindgen]
extern "C" {
    pub type HTMLDocument;

    pub static document: HTMLDocument;

    #[wasm_bindgen(method, js_name = createElement)]
    pub fn create_element(this: &HTMLDocument, tagName: &str) -> Element;

    #[wasm_bindgen(method, js_name = createElement)]
    pub fn create_canvas_element(this: &HTMLDocument, tagName: &str) -> HTMLCanvasElement;

    #[wasm_bindgen(method, getter)]
    pub fn body(this: &HTMLDocument) -> Element;

    #[wasm_bindgen(method, js_name = getElementById)]
    pub fn get_canvas_element_by_id(this: &HTMLDocument, id: &str) -> HTMLCanvasElement;
}

[chinedufn]

Not sure how hard this is to fix but I'd be happy to take a stab with a little guidance!

Incredibly useful for anyone doing WebAssembly work.

Would it be possible to point me in the right direction and I can try my best to take it from there?

[Undin]

@chinedufn It seems that all bindings are generated from some intermediate representation and included into web-sys via include!(env!("BINDINGS"));
Unfortunately, the plugin doesn't take into account any sources included in such way at this moment
See #1908

[chinedufn]

Gotcha - thank you!!