Add log verbosity configuration parameter

This change adds a new powershell.developer.editorServicesLogLevel
configuration setting so that the user can set their desired level of log
output for diagnostic purposes.

Resolves PowerShell#77

Author: daviwil

package.json

@@ -187,6 +187,11 @@
                     "default": "../bin/Microsoft.PowerShell.EditorServices.Host.exe",
                     "description": "Specifies the path to the PowerShell Editor Services host executable."
                 },
+                "powershell.developer.editorServicesLogLevel": {
+                    "type": "string",
+                    "default": "Normal",
+                    "description": "Sets the logging verbosity level for the PowerShell Editor Services host executable."
+                },
                 "powershell.developer.editorServicesWaitForDebugger": {
                     "type": "boolean",
                     "default": false,

src/main.ts

@@ -68,6 +68,9 @@ export function activate(context: vscode.ExtensionContext): void {
     if (settings.developer.editorServicesWaitForDebugger) {
         args.push('/waitForDebugger');
     }
+    if (settings.developer.editorServicesLogLevel) {
+        args.push('/logLevel:' + settings.developer.editorServicesLogLevel)
+    }
 
     let serverPath = resolveLanguageServerPath(settings);
     let serverOptions = {
@@ -95,8 +98,14 @@ export function activate(context: vscode.ExtensionContext): void {
             serverOptions,
             clientOptions);
 
+    languageServerClient.onReady().then(
+        () => registerFeatures(),
+        (reason) => vscode.window.showErrorMessage("Could not start language service: " + reason));
+
     languageServerClient.start();
+}
 
+function registerFeatures() {
     // Register other features
     registerExpandAliasCommand(languageServerClient);
     registerShowHelpCommand(languageServerClient);

src/settings.ts

@@ -12,6 +12,7 @@ export interface IScriptAnalysisSettings {
 
 export interface IDeveloperSettings {
     editorServicesHostPath?: string;
+    editorServicesLogLevel?: string;
     editorServicesWaitForDebugger?: boolean;
 }
 
@@ -29,6 +30,7 @@ export function load(myPluginId: string): ISettings {
 
     let defaultDeveloperSettings = {
         editorServicesHostPath: "../bin/Microsoft.PowerShell.EditorServices.Host.exe",
+        editorServicesLogLevel: "Normal",
         editorServicesWaitForDebugger: false
     }