[vscode-extension] Add serverArguments configuration to allow setting flags for sourcekit-lsp (#265)

* Add serverArguments extension configuration to allow setting flags for sourcekit-lsp

Author: ernieturner

Editors/vscode/package.json

@@ -46,6 +46,14 @@
                     "default": "sourcekit-lsp",
                     "description": "The path of the sourcekit-lsp executable"
                 },
+                "sourcekit-lsp.serverArguments": {
+                    "type": "array",
+                    "default": [],
+                    "items": {
+                        "type": "string"
+                    },
+                    "description": "Arguments to pass to sourcekit-lsp. Argument keys and values should be provided as separate entries in the array e.g. ['--log-level', 'debug']"
+                },
                 "sourcekit-lsp.toolchainPath": {
                     "type": "string",
                     "default": "",

Editors/vscode/src/extension.ts

@@ -8,7 +8,7 @@ export function activate(context: vscode.ExtensionContext) {
 
     const sourcekit: langclient.Executable = {
         command: config.get<string>('serverPath', 'sourcekit-lsp'),
-        args: []
+        args: config.get<string[]>('serverArguments', [])
     };
 
     const toolchain = config.get<string>('toolchainPath', '');