Integrate rls

[KalitaAlexey]

I made a huge refactoring because it had been very ugly and unstructured.
In my opinion now it is better.
I hope I broke nothing.
If there is something broken let me know.

I added integration of RLS.
Check a new property rls.

If you have RLS sources you can try out RLS with the following configuration:

"rls": {
  "executable": "cargo",
  "args": ["run", "--manifest-path=<path/to/RLS/Cargo.toml>"]
}

This PR is going to be open until Sunday.
Then I am going to merge it and publish a new version.

Closes #45.

If you want to try it out:

• Execute:

git clone https://github.com/KalitaAlexey/vscode-rust.git
cd vscode-rust
git fetch origin pull/56/head:pull-56
git checkout pull-56
npm install
code .

• Press CTRL+F5 in VSCode to run the extension

[KalitaAlexey]

I encourage everyone to check that out before it is merged.
Let me know if you have any problems.

[jonasbb]

@KalitaAlexey do you plan to also use rustDocument/diagnosticsBegin and rustDocument/diagnosticsEnd to show the current state of RLS?

[KalitaAlexey]

@jonasbb,
Yes. I think I will add it.

[jonasbb]

I am not able to use the rename feature. I only get a "Info provider failed" banner message.

[KalitaAlexey]

@jonasbb @jonasbb,
You can set env:

"rls": {
    "env": {
        "RUST_LOG": "rls=debug"
    }
}

Then see "Rust Language Server" output channel.

[vadimcn]

Feedback so far:

1. I am getting thread '<unnamed>' panicked at 'RUST_SRC_PATH is set: NotPresent', message from RLS, even though I've already configured "rust.rustLangSrcPath". I think this info should be propagated automatically by the extension.
2. Yeah, it'd be nice to show RLS analysis status, just like rls_vscode does. Otherwise, it's confusing why goto definition which failed after opening the project, then suddenly starts working.

Also, what happens if both the RLS and Racer executables are configured? Which one will get used?

[KalitaAlexey]

@vadimcn,

1. It should be propagated. I will check it again.

[jonasbb]

@KalitaAlexey RLS responds with a valid message

Content-Length: 595

{"jsonrpc":"2.0","id":1,"result":{"changes":{"file:///home/jbushart/projects/rls/sample_project/src/lib.rs":[{"range":{"start":{"line":12,"character":11},"end":{"line":12,"character":19}},"newText":"More"},{"range":{"start":{"line":18,"character":5},"end":{"line":18,"character":13}},"newText":"More"},{"range":{"start":{"line":19,"character":20},"end":{"line":19,"character":28}},"newText":"More"},{"range":{"start":{"line":20,"character":8},"end":{"line":20,"character":16}},"newText":"More"},{"range":{"start":{"line":29,"character":12},"end":{"line":29,"character":20}},"newText":"More"}]}}}

[KalitaAlexey]

@jonasbb,
Okay.
I will check. Thanks for your feedback.

[KalitaAlexey]

@vadimcn,
If RLS is configured, it is turned on, otherwise racer.

[KalitaAlexey]

@jonasbb,

@KalitaAlexey do you plan to also use rustDocument/diagnosticsBegin and rustDocument/diagnosticsEnd to show the current state of RLS?

I added it.

[KalitaAlexey]

@vadimcn,

I am getting thread '' panicked at 'RUST_SRC_PATH is set: NotPresent', message from RLS, even though I've already configured "rust.rustLangSrcPath". I think this info should be propagated automatically by the extension.

I added it.

[KalitaAlexey]

Hi everybody.
I can't integrate it right now because I can't figure out a way to show diagnostics for test or build with some specific features.
If you suggest something I would be glad.
I have two options:

• Execute any cargo command in an integrated terminal, so there is no need for showing diagnostics in editor. It is good since we can see beautiful messages.
• Execute any cargo command in a subprocess, parse diagnostics and add a status bar item to clear diagnostics from the previous cargo command.

[KalitaAlexey]

Okay. Now I am ready to merge it.
I want to describe the extension in the wiki. This may take a while.
I want everyone to test it.
When RLS is used any cargo command is executed in an integrated terminal.

[KalitaAlexey]

When it is merged it will fix #61.
The parameter is executeCargoCommandInTerminal.

[Diggsey]

Since enabling the RLS, I no longer get autocomplete when typing : but pressing ctrl + space still works.

[KalitaAlexey]

Diggsey opened an issue #72