Integrated a new c/c++ language server: cquery

[saibing]

I'm try a new c/c++ language server: cquery

CQuery is a Low-latency language server for large C++ code-bases, powered by libclang. It is much more powerful than clangd.

But I ran into some trouble that cquery need add some initializationOptions:

{
        "initializationOptions": {
                "cacheDirectory": "/tmp/cquery",
		"resourceDirectory": "yourCQueryDirectory/clang_resource_dir"
        }
}

How to use cquery with LanguageClient-neovim

May be Oni need to support config language server's initializationOptions?

[bryphe]

Thanks for logging the issue, @saibing !

Yes, unfortunately our configuration doesn't support this currently... But it would make sense to have something like this, ie:

"language.cpp.languageServer.initializationOptions": {
                 "cacheDirectory": "/tmp/cquery",
		"resourceDirectory": "yourCQueryDirectory/clang_resource_dir"
}

Will use this to track setting the initializationOptions.

[bryphe]

A good place to start looking is here:

oni/browser/src/Services/Language/LanguageConfiguration.ts

Line 99 in 45f51c5

const languageClient = new LanguageClient(language, new LanguageClientProcess(serverRunOptions, initializationOptions, configuration))

Which is the code responsible for taking the configuration settings and handing them off to the language client.

[MaskRay]

FYI
See https://github.com/autozimu/LanguageClient-neovim/wiki/cquery
"resourceDirectory" is auto detected and can be removed now.

[MaskRay]

I'd like to ask how you would like to detect the project root. When there are subpackages, the root compile_commands.json contains entries for subproject files and you do not want files in subprojects to be associated with subprojects, but rather the root project.

proj
 compile_commands.json
 .git
 third_party
  proj0
   .git
   a.cc       // you want this file to be associated with the root project
  proj1
   .git

Sorry for pasting the link of the Emacs lsp-mode discussion thread. But they have the same issue
emacs-lsp/lsp-mode#293 and I think it is beneficial to draw on the wisdom of the masses

[saibing]

@MaskRay
Thank you very much

Now I can solve this problem by add follow config into config.tsx

    "language.cpp.languageServer.rootFiles": ["compile_commands.json", ".cquery"],
    "language.cpp.languageServer.arguments": ["--init", '{"cacheDirectory": "/tmp/oni_cquery"}'],

[chenlijun99]

@saibing Sorry, is cquery working for you with Oni?
I've tried but it doesn't get any suggestions, nor any other lsp features seem to work.

By inspecting the debugger console, there is written

No grammar found for language: cpp
u @ bundle.js:1

[MaskRay]

For cquery users, you may consider ccls. It differs a lot from cquery now (5000 lines fewer, fewer third-party dependencies, IMO simpler but better pipeline, slightly better memory index). You can find some rationale for the fork at emacs-lsp/emacs-ccls#1

https://github.com/MaskRay/ccls/wiki/Getting-started

[MagBad]

@Free-Easy
I'm having a similar issue with the configuration of cquery for oni. Currently this is my config for
for cquery:
"language.cpp.languageServer.command": "/usr/bin/cquery", "language.cpp.languageServer.rootFiles": ["compile_commands.json"], "language.cpp.languageServer.arguments": ["--init", '{cacheDirectory": "/home/magb/.cache/cquery"}']

I'm receiving the same error in the console as @Free-Easy. @saibing could you provide your configuration? And maybe a mention of cquery in the wiki would be nice.

[paulie-g]

Indeed, a working cquery/ccls config would be great to see - can't seem to get either to work properly.