findNvim: support finding nvim in Windows WSL

[xiyaowong]

[justinmk]

Ok, I see that this blocks vscode-neovim/vscode-neovim#2287 .

https://github.com/vscode-neovim/vscode-neovim/blob/c3e8387a9e9f923ec39c28af6cb8985ca431e438/src/main_controller.ts#L181-L186

if (config.useWsl) {
    args.push("C:\\Windows\\system32\\wsl.exe");
    if (config.wslDistribution.length) {
        args.push("-d", config.wslDistribution);
    }
}

I think that findNvim can support this without much complexity, by accepting changing paths: string[] to paths: string[][], so that consumers can pass a command like:

findNvim(..., {
 paths: [
   ['C:\\Windows\\system32\\wsl.exe', '-d', ..., 'nvim'],
 ],
})

Perhaps in the future, findNvim could be more clever and do this internally. But meanwhile this is a simple change.

[gjf7]

Should we search wsl's $PATH?

[justinmk]

Should we search wsl's $PATH?

We could try that in the future, but I think just changing the current paths: string[] to a cmds: string[][] solve the main problem for now.

[gjf7]

I'm not sure I follow. What should findNvim actually return in this case? The full WSL command, or just the nvim path?

[justinmk]

The missing piece is that consumers like vscode-neovim/vscode-neovim#2287 can't send a full command which represents "nvim". It can only send a location (arg0) or directory.

node-client doesn't need to know about WSL, it just needs to run what the consumer gives it. Currently the consumer can only send arg0, but we can fix that by allowing consumers to send [arg0, arg1, ...].

[justinmk]

I have a PR that I'll post in a minute. #432

[gjf7]

Ah, I see.