Word completion during debugging

@renkun-ken I have seen that you did some work on the R language server https://github.com/REditorSupport/languageserver. The debug protocol also offers a possibility to have word completions from a debug session using CompletionRequests:

    interface CompletionsRequest extends Request {
        arguments: CompletionsArguments;
    }
    /** Arguments for 'completions' request. */
    interface CompletionsArguments {
        /** Returns completions in the scope of this stack frame. If not specified, the completions are returned for the global scope. */
        frameId?: number;
        /** One or more source lines. Typically this is the text a user has typed into the debug console before he asked for completion. */
        text: string;
        /** The character position for which to determine the completion proposals. */
        column: number;
        /** An optional line for which to determine the completion proposals. If missing the first line of the text is assumed. */
        line?: number;
    }
    /** Response to 'completions' request. */
    interface CompletionsResponse extends Response {
        body: {
            /** The possible completions for . */
            targets: CompletionItem[];
        };
    }

(from vscode-R-debugger\node_modules\vscode-debugprotocol\lib\debugProtocol.d.ts)

Do you think this would be possible/easy to implement using existing code?

[renkun-ken]

https://github.com/ManuelHentschel/vscDebugger/pull/24

Adds completion of installed packages, language constants, and lazydata.

[renkun-ken]

Now the completion in debug console is quite complete.