Merge #1079

1079: Improve cargo-watch usage in vscode plugin r=matklad a=edwin0cheng

*This PR try to improve current cargo-watch usage in VSCode :*

1. Add Multi-lines error support :
![multilines-error](https://i.imgur.com/gbLEwMG.gif)

2. Add cargo-watch status animation :
![cargo-watch-status](https://i.imgur.com/GbHwzjj.gif)

*Implementation Details*

* Current VSCode `ProblemMatcher` still do not support multiple line parsing.
* However we can, spawn a cargo watch process instead of using vscode.Task to allow more control.
* Use `cargo-check --message-format json` to get json format of compiler-message.
* Use `vscode.DiagnosticCollection` to manage the problems directly, which allow multiple lines diagnostic.

However,
* VSCode use non mono-space font for problems, at this moment i cannot find a good solution about it.
* I am not so good in typescript, please let me know if anything is bad in this PR.





Co-authored-by: Edwin Cheng <[email protected]>
Co-authored-by: Edwin Cheng <[email protected]>

1 files changed, 3 insertions, 0 deletions

diff --git a/docs/user/README.md b/docs/user/README.md
index 439c4e6ae..33dd4f995 100644
--- a/docs/user/README.md
+++ b/docs/user/README.md
@@ -59,7 +59,10 @@ for details.
 * `rust-analyzer.raLspServerPath`: path to `ra_lsp_server` executable
 * `rust-analyzer.enableCargoWatchOnStartup`: prompt to install & enable `cargo
   watch` for live error highlighting (note, this **does not** use rust-analyzer)
+* `rust-analyzer.cargo-watch.check-arguments`: cargo-watch check arguments. 
+  (e.g: `--features="shumway,pdf"` will run as `cargo watch -x "check --features="shumway,pdf""` )  
 * `rust-analyzer.trace.server`: enables internal logging
+* `rust-analyzer.trace.cargo-watch`: enables cargo-watch logging
 
 
 ## Emacs